Micronutrients (B, Co, Cu, Fe, Mn, Mo, and Zn) content in made tea (Camellia sinensis L.) and tea infusion with health prospect: A critical review

Critical Reviews in Food Science and Nutrition

Volumn 57, Issue 14, 2017, Pages 2996-3034

  Karak, Tanmoy ^a   Kutu, Funso Raphael ^b   Nath, Jyoti Rani ^a   Sonar, Indira ^a   Paul, Ranjit Kumar ^c   Boruah, Romesh Kumar ^a   Sanyal, Sandip ^a   Sabhapondit, Santanu ^a   Dutta, Amrit Kumar ^a  

^a Tea Research Association   (India)

^b NORTH WEST UNIVERSITY   (South Africa)

^c ICAR INDIAN AGRICULTURAL STATISTICS RESEARCH INSTITUTE   (India)

Author keywords

Health hazard; instruments; micronutrients; origins; tea infusion

Indexed keywords

HEALTH; HEALTH HAZARDS; INSTRUMENTS; MANGANESE REMOVAL (WATER TREATMENT); NUTRIENTS; POTABLE WATER; TRACE ELEMENTS; ZINC;

ADVERSE EFFECT; BENEFICIAL EFFECTS; CAMELLIA SINENSIS; CRITICAL REVIEW; MICRONUTRIENTS; ORIGINS; TEA INFUSION; WORLD HEALTH ORGANIZATION;

MANGANESE;

COBALT; COPPER; IRON; MANGANESE; MOLYBDENUM; TRACE ELEMENT; ZINC;

CAMELLIA SINENSIS; CHEMISTRY; HUMAN; TEA;

CAMELLIA SINENSIS; COBALT; COPPER; HUMANS; IRON; MANGANESE; MICRONUTRIENTS; MOLYBDENUM; TEA; ZINC;

EID: 85019548441     PISSN: 10408398     EISSN: 15497852     Source Type: Journal    
DOI: 10.1080/10408398.2015.1083534     Document Type: Article

References (223)

1. Abdolmaleki, F., Sedaghati, M., and Nateghi, L., (2013). Determination of elemental content of black teas in land north of Iran. European Journal of Experimental Biology 3(2):262–265.
2. Achudume, A. C., and Owoeye, D., (2010). Quantitative assessment of heavy metals in some tea marketed in Nigeria-Bioaccumulation of heavy metals in tea. Health 2:1097–1100.
3. Ahmad, S., Khader, J. A., Gilani, S. S., Khan, S., Noor, S., Ullah, R., Hussain, I., Kanwal, F., Ullah, H., and Shah, Z., (2012). Determination of mineral and toxic heavy elements in different brands of black tea of Pakistan. African Journal of Pharmacy and Pharmacology 6(15):1194–1196.
4. Ahmed, A., Ahmad, A., Khalid, N., David, A., Sandhu, M. A., Randhawa, M. A., and Suleria, H. A. R., (2014). A question mark on iron deficiency in 185 million people of Pakistan:Its outcomes and prevention. Crit. Rev. Food Sci. Nutr. 54(12):1617–1635.
5. Akhtar, S., Anjum, F. M., and Anjum, M. A., (2011). Micronutrient fortification of wheat flour:Recent development and strategies. Food Res. Int. 44(3):652–659.
6. Aksuner, N., Henden, E., Aker, Z., Engin, E., and Satik, S., (2012). Determination of essential and non-essential elements in various tea leaves and tea infusions consumed in Turkey. Food Addit. Contam. B. 5(2):126–132.
7. Alasalvar, C., Pelvan, E., Özdemir, Kübra S., Kocadağlǐ, T., Mogol, Atac B., Pasl, A. A., Özcan, N., Özçelik, B., and Gökmen, V., (2013). Compositional, nutritional, and functional characteristics of instant teas produced from low- and high-quality black teas. J. Agric. Food Chem. 61:7529–7536.
8. Alassane, T., Mouhamadou, D., El Hadji Omar, G. P., Ahmadou, W., Pierre, L., Ousmane, S., and Souleymane, M., (2013). Characterization of element and mineral content in Artemisia annua and Camellia sinensis leaves by handheld X-ray fluorescence. Afr. J. Biotechnol. 12(26):4179–4186.
9. Anitha, E., Praveena, V., Ramesh Babu, N. G., and Manasa, P., (2013). Enumeration of foliar fertilizer efficiency in India's top commercial crop-tea. Int. J. Innovative Res. Sci. Eng. Technol. 2(12):8038–8046.
10. Al-Othman, Z. A., Yilmaz, E., Sumayli, H. M. T., and Soylak, M., (2012). Evaluation of trace metals in tea samples from Jeddah and Jazan, Saudi Arabia by atomic absorption spectrometry. Bull. Environ. Contam. Toxicol. 89:1216–1219.
11. AL-Oud, S. S., (2003). Heavy metal contents in tea and herb leaves. Pak. J. Biol. Sci. 6:208–212.
12. Ambadekar, S. R., Parab, S., and Bachankar, A., (2012). Cadmium, copper, nickel, lead in some tea samples in India. Int. J. Pharm. Biol. Sci. 3(2):943–946.
13. Anand, T., Rahi, M., Sharma, P., and Ingle, G. K., (2014). Issues in prevention of iron deficiency anemia in India. Nutr. 30(7–8):764–770.
14. Ansari, F., Norbaksh, R., and Daneshmandirani, K., (2007). Determination of heavy metals in Iranian and imported black tea. Iran. J. Environ. Health Sci. Eng. 4(4):243–248.
15. Antakli, S. S., and Al-Check, A. M., (2011). Determination of copper, iron, manganese, nickel and zinc in tea leaf consumed in Syria by flame atomic absorption spectrometry after microwave digestion. Asian J. Chem. 23:3268–3272.
16. Antunes, P. M., Franken, P., Schwarz, D., Rillig, M. C., Cosme, M., Scott, M., and Hart, M. M., (2012). Linking soil biodiversity and human health:Do arbuscular mycorrhizal fungi contribute to food nutrition. In:Wall, et al. (eds.), Soil Ecology and Ecosystem Services. Oxford University Press, Oxford, UK, pp. 153–172.
17. Araya, M., Olivares, M., and Pizarro, F., (2007). Copper in human health. Int. J. Environ. Health 1:608–620.
18. Ashenef, A., (2014). Essential and toxic metals in tea (Camellia sinensis) imported and produced in Ethiopia. Food Additives & Contaminants:Part B:Surveillance 7(1):30–36.
19. Ashraf, C. W., and Mian, A., (2008). Levels of selected heavy metals in black tea varieties consumed in Saudi Arabia. Bull. Environ. Contam. Toxicol. 81:101–104.
20. ATSDR (Agency for Toxic Substances and Diseaste Registry). (2004). Toxicological Profile for Cobalt. U.S. Department of Health and Human Services, Public Health Service, Agency for Toxic Substances and Disease Registry, Atlanta, GA.
21. Balch, P. A., and Balch, J. F., (2000). Prescription for Nutritional Healing. Avery, New York.
22. Bansal, S., Choudhary, S., Sharma, M., Kumar, S. S., Lohan, S., Bhardwaj, V., Syan, N., and Jyoti, S., (2013). Tea:A native source of antimicrobial agents. Food Res. Int. 53(2):568–584.
23. Baruah, B. K., Haque, A., Das, B., Medhi, C., and Misra, A. K., (2011). Boron in soil and water samples in some tea garden belt of Golaghat district, Assam. Adv. Appl. Sci. Res. 2(4):298–305.
24. Berger, K. C., (1949). Boron in soils and crops. Adv. Agron. 1:321–351.
25. Bottex, B., Dorne, J. L. C. M., Carlander, D., Benford, D., Przyrembel, H., Heppner, C., Kleiner, J., and Cockburn, A., (2008). Risk-benefit health assessment of food-Food fortification and nitrate in vegetables. Trends Food Sci. Technol. 19(1):113–119.
26. Brun, L. A., Maillet, J., Hinsinger, P., and Pépin, M., (2001). Evaluation of copper availability to plants in copper-contaminated vineyard soils. Environ. Pollut. 111:293–302.
27. Brzezicha, J., Grembecka, M., and Szefer, P., (2014). Macro and microelements in green tea and its infusions.5th International Conference on Environmental Science and Technology IPCBEE 69:95–98 © (2014) IACSIT Press, Singapore DOI:10.7763/IPCBEE
28. Bulusu, S., and Wesley, A. S., (2011). Addressing micronutrient malnutrition through food fortification. In:Sheila Chander, Vir (ed.), Public Health Nutrition in Developing Countries (Part 1 and II) WPI Publishing, pp. 795–843.
29. Burguera, J. L., and Burguera, M., (2007). Molybdenum in human whole blood of adult residents of the Merida State (Venezuela). J. Trace Elem. Med. Biol. 21(3):178–183.
30. Cabrera, C., Giménez, R., and López, M. C., (2003). Determination of tea components with Antioxidant activity. J Agric. Food Chem. 51:4427–4435.
31. Cakmak, I., (2008). Enrichment of cereal grains with zinc:Agronomic or genetic biofortification? Plant Soil. 302:1–17.
32. Cao, H. B., Qiao, L., Zhang, H., and Chen, J. J., (2010). Exposure and risk assessment for aluminium and heavy metals in Puerh tea. Sci. Total Environ. 408:2777–2784.
33. Chand, P., Sharma, R., Prasad, R., Sud, R. K., and Pakade, Y. B., (2011). Determination of essential & toxic metals and its transversal pattern from soil to tea brew. Food. Nutr. Sci. 2:1160–1165.
34. Chen, Z. M., (1984). The environmental pollutants in tea products. Chin. J. Externl Agric. 3:1–10.
35. Chen, Y., Yu, M., Xu, J., Chen, X., and Shi, J., (2009). Differentiation of eight tea (Camellia sinensis) cultivars in China by elemental fingerprint of their leaves. J. Sci. Food Agric. 89:2350–2355.
36. Chiplonkar, S. A., Tarwadi, K. V., Kavedia, R. B., Mengale, S. S., Paknikar, K. M., and Agte, V. V., (1999). Fortification of vegetarian diets for increasing bioavailable iron density using green leafy vegetables. Food Res. Int. 32(3):169–174.
37. Colak, H., Soylak, M., and Turkoglu, O., (2005). Determination of trace metal content of various herbal and fruit teas produced and marketed in Turkey. Trace Elem. Electrolytes. 22:192–195.
38. Cook, J. D., and Lynch, S. R., (1986). The liabilities of iron deficiency. Blood 68:803–809.
39. Cooper, R., Morré, D. J., and Morré, D. M., (2005). Medicinal benefits of green tea:Part I. Review of noncancer health benefits. J. Altern. Complement. Med. 11:521–528.
40. Costa, L. M., Gouveia, S. T., and Nobrega, J. A., (2002). Comparison of heating extraction procedures for Al, Ca, Mg and Mn in tea samples. Anal. Sci. 18:313–318.
41. da Silva Messias, R., Galli, V., Silva, S. D. D. A. E., Schirmer, M. A., and César Valmor Rombaldi, C. V., (2015). Micronutrient and functional compounds biofortification of maize grains. Crit. Rev. Food Sci. Nutr. 55(1):123–139.
42. Dambiec, M., Polechońska, L., and Klink, A., (2013). Levels of essential and non-essential elements in black teas commercialized in Poland and their transfer to tea infusion. J. Food Compos. Anal. 31(1):62–66.
43. Das, D. K., Dutta, S., Maiti, D., and Karak, T., (2004). Desorption of sorbed Zn in some acid soils affected by organic matter application. J. Food Agric. Environ. 2:250–253.
44. Das, D. K., Karak, T., and Maiti, D., (2006). Effect of foliar application of different sources of Zn on the changes in Zn content, uptake and yield of rice (Oryza sativa L.). Ann. Agric. Res. New. Ser. 25(2):253–256.
45. Dawodu, M. O., Obimakinde, S. O., and Olutona, G. O., (2013). Trace metal concentrations in some tea leaves consumed in Ibadan, Nigeria. Afr. J. Agric. Res. 8(46):5771–5775.
46. Derun, E. M., Kipcak, A. S., and Ozdemir, O. D., (2010). The Determination of the boron amounts of teas that are sold In Turkey by using the ICP-OES technique. Proceedings of the World Congress on Engineering 2010 Vol III WCE 2010, June30–July2, 2010, London, UK.
47. Desideri, D., Meli, M. A., Roselli, C., and Feduzi, L., (2011). Polarized X-ray fluorescence spectrometer (EDPXRF) for the determination of essential and non-essential elements in tea. Microchem. J. 98(2):186–189.
48. Devirian, T. A., and Volpe, S. L., (2003). The physiological effects of dietary boron. Crit. Rev. Food Sci. Nutr. 43(2):219–231.
49. Dobrowolski, R., and Otto, M., (2012). Determination of nickel and cobalt in reference plant materials by carbon slurry sampling GFAAS technique after their simultaneous pre-concentration onto modified activated carbon. J. Food Compos. Anal. 26(1–2):58–65.
50. Donkora, A., Kuranchiea, C., Osei-Fosua, P., Nyarkoa, S., and Doamekpora, L., (2015). Assessment of essential minerals and toxic trace metals in popularly consumed tea products in Ghana:A preliminary study. Res J. Chem. Environ. Sci. 3(1):49–55.
51. Dufresne, C. J., and Farnworth, E. R., (2001). A review of latest research findings on the health promotion properties of tea. J. Nutr. Biochem. 12:404–421.
52. Fageria, N. K., Baligar, V. C., and Clark, R. B., (2002). Micronutrients in crop production. Adv. Agron. 77:185–268.
53. Fageria, N. K., and Moreira, A., (2011). The role of mineral nutrition on root growth of crop plants. Adv. Agron. 110:251–331.
54. Falah, E., and Hedaiati, R., (2013). Heavy metal content of black teas consumed in Iran. Food Addit. Contam. B. 6(2):123–126.
55. FAO/WHO, 2001. Report of a Joint FAO/WHO/UNU Expert Consultation, Rome, Italy, 17–24 October 2001.
56. Feng, H., Wang, T., and Li, S. F. Y., (2003). Sensitive determination of trace-metal elements in tea with capillary electrophoresis by using chelating agent 4-(2-pyridylazo) resorcinol (PAR). Food Chem. 81(4):607–611.
57. Fernandez, P. L., Pablos, F., Martin, M. J., and Gonzalez, A. G., (2002). Multi-element analysis of tea beverages by inductively coupled plasma atomic emission spectrometry. Food Chem. 76:483–489.
58. Ferrara, L., Montesanoa, D., and Senatore, A., (2001). The distribution of minerals and flavonoids in the tea plant (Camellia sinensis). II Farmaco. 56:397–401.
59. FNB (Food and Nutrition Board). (2001). Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. National Academy Press, Washington DC.
60. Gál, J., Hursthouse, A., Tatner, P., Stewart, F., and Welton, R., (2008). Cobalt and secondary poisoning in the terrestrial food chain:Data review and research gaps to support risk assessment. Environ. Int. 34(6):821–838.
61. Gallaher, R. N., Gallaher, K., Marshall, A. J., and Marshall, A. C., (2006). Mineral analysis of ten types of commercially available tea. J. Food Compos. Anal. 19:53–57.
62. Gebretsadik, D. W., and Chandravanshi, B. S., (2010). Levels of metals in commercially available Ethiopian black teas and their liquors. Bull. Chem. Soc. Ethiop. 24(3):339–349.
63. Gohain, T., Barbora, A. C., and Deka, A., (2000). Effect of boron on yield and quality of tea. J. Plantation Crops. 28(1):68–71.
64. Görür, F. K., Keser, R., Akçay, N., Dizman, S., and Okumuşoğlu, N. T., (2011). Radionuclides and heavy metals concentrations in Turkish market tea. Food Control 22(12):2065–2070.
65. Graham, R. D., Knez, M., and Welch, R. M., (2012). How much nutritional iron deficiency in humans globally is due to an underlying zinc deficiency? Adv. Agron. 115:1–40.
66. Graham, R. D., Welch, R. M., and Bouis, H. E., (2001). Addressing micronutrient malnutrition through enhancing the nutritional quality of staple foods:Principles, perspectives and knowledge gaps. Adv. Agron. 70:77–142.
67. Gupta, U. C., and Gupta, S. C., (2014). Sources and deficiency diseases of mineral nutrients in human health and nutrition:A review. Pedosphere 24(1):13–38.
68. Gupta, U. C., Wu, K., and Liang, S., (2008). Micronutrients in soils, crops, and livestock. Earth Sci. Front. 15(5):110–125.
69. Gürkan, R., Aksoy, Ü., Ulusoy, H. İ., and Akçay, M., (2013). Determination of low levels of molybdenum (VI) in food samples and beverages by cloud point extraction coupled with flame atomic absorption spectrometry. J. Food Compos. Anal. 32(1):74–82.
70. Hajiboland, R., Bahrami-Rad, S., and Bastani, S., (2013a). Phenolic metabolism in boron-deficient tea [Camellia sinensis (L.) O. Kuntze] plants. Acta Biologica Hungarica 64(2):196–206.
71. Hajiboland, R., Bahrami-Rad, S., Bastani, S., Tolrà, R., and Poschenrieder, C., (2013b). Boron re-translocation in tea [Camellia sinensis (L.) O. Kuntze] plants. Acta Physiologiae Plantarum. 35(8):2373–2381.
72. Han, S., Gan, W., and Su, Q., (2007). On-line sample digestion using an electromagnetic heating column for the determination of zinc and manganese in tea leaf by flame atomic absorption spectrometry. Talanta 72:1481–1486.
73. Han, Q., Mihara, S., and Fujino, T., (2014). Multi-element detection in green, black, Oolong, and Pu-erh teas by ICP-MS. Biochem. Physiol. 3:132. doi:10.4172/2168-9652.1000132
74. Hayat, K., Iqbal, H., Malik, U., Bilal, U., and Mushtaq, S., (2015). Tea and its consumption:Benefits and risks. Crit. Rev. Food Sci. Nutr. 55(7):939–954.
75. Herrador, M. Á., and González, A. G., (2001). Pattern recognition procedures for differentiation of green, black and Oolong teas according to their metal content from inductively coupled plasma atomic emission spectrometry. Talanta. 53(6):1249–1257.
76. Hokin, B., Adams, M., Ashton, J., and Louie, H., (2004). Comparison of the dietary cobalt intake in three different Australian diets. Asia-Pac. J. Nutr. 13:289–291.
77. Hope, S. J., Daniel, K., Gleason, K. L., Comber, S., Nelson, M., and Powell, J. J., (2006). Influence of tea drinking on manganese intake, manganese status and leucocyte expression of MnSOD and cytosolic amino-peptidase P. Eur. J. Clin. Nutr. 60:1–8.
78. Hunter, D., Foster, M., McArthur, J. O., Ojha, R., Petocz, P., and Samman, S., (2011). Evaluation of the micronutrient composition of plant foods produced by organic and conventional agricultural methods. Crit. Rev. Food Sci. Nutr. 51(6):571–582.
79. Islam, M. A., and Ebihara, M., (2012). Elemental characterization of Japanese green tea leaves and tea infusion residue by neutron-induced prompt and delayed gamma-ray analysis. Arabian J. Chem. (In Press).
80. Islam, M. R., Jahiruddin, M., Islam, Md. R., Alim, Md. A., and Akhtaruzzaman, Md., (2013). Consumption of unsafe foods:Evidence from heavy metal, mineral and trace element contamination. Report:Department of Soil Science Bangladesh Agricultural University, Mymensingh. http://fpmu.gov.bd/agridrupal/sites/default/files/ToR%2016%20Final%20Report.pdf (accessed on 24thJuly, 2015).
81. Jabeen, S., Alam, S., Saleem, M., Ahmad, W., Bibi, R., Hamid, F. S., and Shah, H. U., (2015). Withering timings affect the total free amino acids and mineral contents of tea leaves during black tea manufacturing. Arabian J. Chem. http://dx.doi.org/10.1016/j.arabjc.2015.03.011
82. Jain, A., Manghani, C., Kohli, S., Nigam, D., and Rani, V., (2013). Tea and human health:The dark shadows. Toxicol. Lett. 220(1):82–87.
83. Jalbani, N., Kazi, T. G., Arain, B. M., Jamali, M. K., and Afridi, H. I., (2007). Evaluation of total contents of Al, As, Ca, Cd, Fe, K, Mg, Ni, Pb, Zn and their fractions leached to the infusions of different tea samples. A multivariate study. Chem. Speciation Bioavail. 19(4):163–173.
84. Jelkmann, W., and Lundby, C., (2011). Blood doping and its detection. Blood 118:2395–2404.
85. Jeszka-Skowron, M., Krawczyk, M., Zgoła-Grześkowiak, A., (2015). Determination of antioxidant activity, rutin, quercetin, phenolic acids and trace elements in tea infusions:Influence of citric acid addition on extraction of metals. J. Food Compos. Anal. 40:70–77.
86. Jin, C. W., Du, S. T., Zhang, K., and Lin, X. Y., (2008). Factors determining copper concentration in tea leaves produced at Yuyao County, China. Food and Chemical Toxicology 46(6):2054–2061.
87. Jonah, S. A., and Williams, I. S., (2000). Nutrient elements of commercial tea from Nigeria by an instrumental neutron activation analysis technique. Sci. Total Environ. 258:205–208.
88. Kara, D., (2009). Evaluation of trace metal concentrations in some herbs and herbal teas by principal component analysis. Food Chem. 114(1):347–354.
89. Karak, T., Abollino, O., Bhattacharyya, P., Das, K. K., and Paul, R. K., (2011). Fractionation and speciation of arsenic in three tea gardens soil profiles and distribution of As in different parts of tea plant (Camellia sinensis L.). Chemosphere 85:948–960.
90. Karak, T., and Bhagat, R. M., (2010). Trace elements in tea leaves, made tea and tea infusion:A review. Food Res. Int. 43(9):2234–2252.
91. Karak, T., Das, D. K., and Maity, D., (2006). Yield and Zn-uptake in rice (Oryza sativa L.) as influenced by sources and times of Zn application. Indian J. Agric. Sci. 76(6):346–348.
92. Karak, T., Paul, R. K., Boruah, R. K., Dutta, A. K., Sonar, I., Bordoloi, B., and Borkotoky, B., (2015a). Major soil chemical properties of the major tea-growing areas in India. Pedosphere 25(2):316–328.
93. Karak, T., Paul, R. K., Sonar, I., Sanyal, S., Ahmed, K. Z., Boruah, R. K., Das, D. K., and Dutta, A. K., (2014a). Chromium in soil and tea (Camellia sinensis L.) infusion:Does soil amendment with municipal solid waste compost make a sense? Food Res. Int. 64:114–124.
94. Karak, T., Singh, U. K., Das, S., Das, D. K., and Kuzyakov, Y., (2005b). Comparative efficacy of ZnSO4 and Zn-EDTA application for fertilization of rice (Oryza sativa L.). Arch. Agron. Soil Sci. 51:253–264.
95. Karak, T., Singh, U. K., and Lai, J., (2005a). Influences of starch and Zn-EDTA on Zn-desorption and rice (Oryza sativa L.) nutrition under different moisture regimes. Arch. Agron. Soil Sci. 51:265–280.
96. Karak, T., Sonar, I., Paul, R. K., Frankowski, M., Boruah, R. K., Dutta, A. K., and Das, D. K., (2015b). Aluminium dynamics from soil to tea plant (Camellia sinensis L.):Is it enhanced by municipal solid waste compost application? Chemosphere 119:917–926.
97. Kendüzler, E., and Türker, A. R., (2003). Atomic absorption spectrophotometric determination of trace copper in waters, aluminium foil and tea samples after pre-concentration with 1-nitroso-2-naphthol-3,6-disulfonic acid on Ambersorb 572. Anal. Chim. Acta. 480(2):259–266.
98. Kim, J. H., Gibb, H. J., and Howe, P. D., (2006). Cobalt and inorganic cobalt compounds. WHO:Concise International Chemical Assessment, Rome.
99. Kim, H., House, W. A., and Miller, D. D., (2004). Habitual tea consumption protects against the inhibitory effects of tea on iron absorption in rats. Nutr. Res. 24(6):383–393.
100. Korkmaz, G. F., Keser, R., and Akçay, N., (2011). Radionuclides and heavy metals concentrations in Turkish market tea. Food Control. 22(12):2065–2070.
101. Krejčová, A., and Černohorský, T., (2003). The determination of boron in tea and coffee by ICP-AES method. Food Chem. 82(2):303–308.
102. Kronborg, A. I. E., (2013). Trace elements in Norwegian and Polish tea infusions determined by High-Resolution Inductively Coupled Plasma Mass Spectrometry (HR ICP-MS) and Ion Selective Electrode (ISE). Master thesis at the Department of Chemistry at the Norwegian University of Science and Technology (NTNU).
103. Kumar, A., Manjunath, K. R., Meenakshi, Bala, R., Sud, R. K., Singh, R. D., and Panigrahy, S., (2013). Field hyper spectral data analysis for discriminating spectral behavior of tea plantations under various management practices. Int. J. Appl. Earth Obs. Geo. 23:352–359.
104. Kumar, A., Nair, A. G. C., Reddy, A. V. R., and Garg, A. N., (2005). Vailability of essential elements in Indian and US tea brands. Food Chem. 89(3):441–448.
105. Lamble, K., and Hill, S. J., (1995). Determination of trace metals in tea using both microwave digestion at atmospheric pressure and inductively coupled plasma atomic emission spectrometry. Anal. 120:413–417.
106. Lasheen, Y. F., Awwad, N. S., El-khalafawy, A., and Abdel-Rassoul, A. A., (2008). Annual effective dose and concentration levels of heavy metals in different types of tea in Egypt. Int. J. Phys. Sci. 3(5):112–119.
107. Leach, R. M., Jr. (1988). The role of trace elements in the development of Cartilage matrix. In:Hurley, C. L., Keen, B. L., and Rucker, R. B., (eds.), Trace element in man and animal 6. Plenum Publishing Corp., New York, NY, pp. 267–271.
108. Lee, L. K., and Foo, K. Y., (2013). Recent advances on the beneficial use and health implications of Pu-Erh tea. Food Res. Int. 53(2):619–628.
109. Li, X., Zhang, Z., Li, P., Zhang, Qi., Zhang, W., and Ding, X., (2013). Determination for major chemical contaminants in tea (Camellia sinensis) matrices:A review. Food Res. Int. 53(2):649–658.
110. Lv, H. P., Lin, Z., Tan, J. F., and Guo, L., (2013a). Contents of fluoride, lead, copper, chromium, arsenic and cadmium in Chinese Pu-erh tea. Food Res. Int. 53(2):938–944.
111. Lv, H., Zhang, Y., Lin, Z., and Liang, Y., (2013b). Processing and chemical constituents of Pu-erh tea:A review. Food Res. Int. 53(2):608–618.
112. Mabesa, R. L., Impa, S. M., Grewal, D., and Johnson-Beebout, S. E., (2013). Contrasting grain-Zn response of bio-fortification rice (Oryza sativa L.) breeding lines to foliar Zn application. Field Crops Res. 149:223–233.
113. Malik, J., Szakova, J., Drabek, O., Balik, J., and Kokoska, L., (2008). Determination of certain micro and macro-elements in plant stimulants and their infusions. Food Chem. 111(2):520–525.
114. Marbaniang, D. G., Baruah, P., Decruse, R., Dkhar, E. R., Diengdoh, D. F., and Nongpiur, C. L., (2011). Study of trace metal (Cr, Mn, Fe, Co, Ni, Cu, Zn nd Cd) composition in tea available at Shillong, Meghalaya, India. Int. J. Environ. Prot. 1(1):13–21.
115. Marrotte, E. J., Chen, D., Hakim, J. S., and Chen, A. F., (2010). Manganese superoxide dismutase expression in endothelial progenitor cells accelerates wound healing in diabetic mice. J. Clin. Invest. 120:4207–4219.
116. Martínez-Navarrete, N., Camacho, M. M., Martínez-Lahuerta, J., Martínez-Monzó, J., and Fito, P., (2002). Iron deficiency and iron fortified foods-A review. Food Res. Int. 35(2–3):225–231.
117. Matsuura, H., Hokura, A., Katsuki, F., Itoh A., and Haraguchi, H., (2001). Multielement determination and speciation of major-to-trace elements in black tea leaves by ICP-AES and ICP-MS with the aid of size exclusion chromatography. Anal. Sci. 17:391–398.
118. McKenzie, J. S., Jurado, J. M., and de Pablos, F., (2010). Characterisation of tea leaves according to their total mineral content by means of probabilistic neural networks. Food Chem. 123(3):895–864.
119. Mehra, A., and Baker, C. L., (2007). Leaching and bioavailability of aluminium, copper and manganese from tea (Camellia sinensis). Food Chem. 100:1456–1463.
120. Melucci, D., Locatelli, M., and Locatelli, C., (2013). Trace level volta-metric determination of heavy metals and total mercury in tea matrices (Camellia sinensis). Food Chem. Toxicol. 62:901–907.
121. Memić, M., Mahić, D., Žero, S., and Muhić-Šarac, T., (2014). Comparison of different digestion methods of green and black tea at the Sarajevo market for the determination of the heavy metal content. J. Food. Meas. Charact. 8(2):149–154.
122. Mierzwa, J., Sun, Y. C., Chung, Y. T., and Yang, M. H., (1998). Comparative determination of Ba, Cu, Fe, Pb and Zn in tea leaves by slurry sampling electro-thermal atomic absorption and liquid sampling inductively coupled plasma atomic emission spectrometry. Talanta. 47:1263–1270.
123. Milani, R. F., Morgano, M. A., Saron, E. S., Silva, F. F., and Cadore, S., (2015). Evaluation of direct analysis for trace elements in tea and herbal beverages by ICP-MS. J. Braz. Chem. Soc. 26(6):1211–1217.
124. Moghaddam, M. A., Mahvi, A. H., Asgari, A. R., Yonesian, M., Jahed, G. H., and Nazmara, S. H., (2008). Determination of aluminum and zinc in Iranian consumed tea. Environ. Monit. Assess. 144:23–30.
125. Moreda-Piñeiro, A., Fisher, A., and Hill, S. J., (2003). The classification of tea according to region of origin using pattern recognition techniques and trace metal data. J. Food Compos. Anal. 16(2):195–211.
126. Mose, M. T., Moseti, K. O., Wanyoko, J. K., Kinyua, J. K., Kariuki, D., Magiri, E. N., and Obanda, M. A., (2014). Selected inorganic nutrients in black tea from three tea growing agro-ecological areas in Kenya. Am. J. Plant. Sci. 5:473–479.
127. Moseti, K. O., Kinyanjui, T., Wanyoko, J. K., Kurgat, J. K., Too, J. C., Omondi, K. G., and Wachira, F. N., (2013). Fe, Zn, Cu, Pb and Cd in tea grown and marketed in Kenya:A quantitative assessment. Int. J. Environ. Prot. 3(6):24–30.
128. Mucchino, C., and Musci, M., (2014). Extraction of Al, Cu, Fe, Mn, Ni and Zn-polyphenol complexes from black tea in fusions by Amberlite resins. J. Sci. Food Agric. 94:2234–2238.
129. Murray, J. F., and Schlekat, C. E., (2004). Comparison of risk assessments of boron:Alternate approaches to chemical-specific adjustment factors. Hum. Ecol. Risk Assess. 10:57–68.
130. Murray-Kolb, L. E., Takaiwa, F., Goto, F., Yoshihara, T., Theil, E. C., and Beard, L. L., (2002). Transgenic rice is a source of iron for iron-depleted rats. J. Nutr. 132:957–960.
131. Naithani, V., and Kakkar, P., (2005). Evaluation of heavy metals in Indian herbal teas. Bull. Environ. Contam. Toxicol. 75(1):197–203.
132. Narin, I., Colak, H., Torkoglu, O., Soylak, M., and Dogan, M., (2004). Heavy metals in black tea samples produced in Turkey. Bull. Environ. Contam. Toxicol. 72:844–849.
133. Narin, I., and Soylak, M., (2003). Enrichment and determinations of nickel(II), cadmium(II), copper(II), cobalt(II) and lead(II) ions in natural waters, table salts, tea and urine samples as pyrrolydine dithiocarbamate chelates by membrane filtration-flame atomic absorption spectrometry combination. Anal. Chim. Acta. 493(2):205–212.
134. Natesan, S., and Ranganathan, V., (1990). Content of various elements in different parts of the tea plant and in infusions of black tea from Southern India. J. Sci. Food Agric. 51(1):125–139.
135. Nath T. N., (2013). The status of micronutrients (Mn, Fe, Cu, Zn) in tea plantations in Dibrugarh district of Assam, India. Int. Res. J. Environ. Sci. 2(6):25–30.
136. Nejatolahi, M., Mortazavi, S., and Ildoromi, A., (2014). Levels of Cu, Zn, Pb, and Cd in the leaves of the tea plant (Camellia sinensis) and in the soil of Gilan and Mazandaran farms of Iran. J. Food. Meas. Charact. 8(4):277–282.
137. Ni, L., and Li, S., (2008). Effects of organic matters coming from Chinese tea on soluble copper release from copper teapot. Sci. Total Environ. 389:202–207.
138. Nielsen, F. H., (2009). Micronutrients in parenteral nutrition:boron, silicon, and fluoride. Gastroenterology 137:55–60.
139. Nielsen, F. H., (2014). Update on human health effects of boron. J. Trace Elem. Me. Biol. 28(4):383–387.
140. Ning, P., Gong, C., Zhang, Y., Guo, K., and Bai, J., (2011). Lead, cadmium, arsenic, mercury and copper levels in Chinese Yunnan Pu'er tea. Food Addit. Contam. Part B. 4:28–33.
141. Njogu, R. N. E., Kariuki, D. K., Kamau, D. M., and Wachira, F. N., (2014). Effects of foliar fertilizer application on quality of tea (Camellia sinensis) grown in the Kenyan highlands. Am. J. Pl. Sci. 5:2707–2715.
142. Nookabkaew, S., Rangkadilok, N., and Satayavivad, J., (2006). Determination of trace elements in herbal tea products and their infusions consumed in Thailand. J. Agric. Food. Chem. 54(18):6939–6944.
143. Nriagu, J., (2007). Zinc Deficiency in Human Health. Elsevier, Web-based resource.
144. Nriagu, J., (2011). Zinc Deficiency in Human Health. Reference Module in Earth Systems and Environmental Sciences, from Encyclopedia of Environmental Health, pp. 789–800.
145. Omwoyo, W. N., Owuor, P. O., Onger, D. M., Kamau, D. M., Kwach, B. O., Munyao, P. M., and Otieno, M. O., (2013). Avaiability of some inorganic micronutrients and effects of grading on their levels in East African black teas and infusions. Asian J. Biol. Life Sci. 2:42–49.
146. Özcan, M. M., Ünver, A., Uçar, T., and Arslan, D., (2008). Mineral content of some herbs and herbal teas by infusion and decoction. Food Chem. 106(3):1120–1127.
147. Palit, S., Sharma, A., and Talukder, G., (1994). Effects of cobalt on plants. Bot. Rev. 60(2):149–81.
148. Park, H. J., Bae, H. J., Im, S. S., and Song, K. D., (2014). Green tea and type 2 diabetes. Integr. Med. Res. 3(1):4–10.
149. Paz-Rodríguez, B., Domínguez-González, M. R., Aboal-Somoza, M., and Bermejo-Barrera, P., (2015). Application of high resolution-continuum source flame atomic absorption spectrometry (HR-CS FAAS):Determination of trace elements in tea and tisanes. Food Chem. 170:492–500.
150. Pedro, L. F., Martin, M. J., Pablos, F., and Gonzalez, A. G., (2001). Differentiation of tea (Camellia sinensis) varieties and their geographical origin according to their metal content. J. Agric. Food. Chem. 49:4775–4779.
151. Pękal, A., Biesaga, M., and Pyrzynska, K., (2013). Trace metals and flavonoids in different types of tea. Food Sci. Biotechnol. 22(4):925–930.
152. Pellegrino, E., and Bedini, S., (2014). Enhancing ecosystem services in sustainable agriculture:Biofertilization and biofortification of chickpea (Cicer arietinum L.) by arbuscular mycorrhizal fungi. Soil Biol. Biochem. 68:429–439.
153. Petit, D., El Houari, W., Jacobs, K., Baeyens, W., & Leermakers, M., (2013). Trace element content in tea brewed in traditional metallic and stainless steel tea pots. Environ. Monit. Assess. 185:8957–8966.
154. Pinto, M, (2013). Tea:A new perspective on health benefits. Food Res. Int. 53(2):558–567.
155. Piskin, M. B., Kipcak, A. S., Ozdemir, O. D., and Derun, E. M., (2013). Determination of boron in black and herbal teas. Adv. Sci. Lett. 19:3576–3578.
156. Pohl, P., and Prusisz, B., (2007). Fractionation analysis of manganese and zinc in tea infusions by two-column solid phase extraction and flame atomic absorption spectrometry. Food Chem. 102(4):1415–1424.
157. Polechońska, L., Dambiec, M., Klink, A., and Rudecki, A., (2015). Concentrations and solubility of selected trace metals in leaf and bagged black teas commercialized in Poland. J. Food Drug Anal. 23(3):486–492.
158. fifiPrasad, R., Shivay, Y. S., and Kumar, D., (2014). Agronomic biofortification of cereal grains with iron and zinc. Adv. Agron. 125:55–91.
159. Prasad, S. A., (2012). Discovery of human zinc deficiency:50 years later. J. Trace Elem. Med. Biol. 26(2–3):66–69.
160. Qin, F., and Chen, W., (2007). Lead and copper levels in tea samples marketed in Beijing, China. Bull. Environ. Contam. Toxicol. 79:247–250.
161. Reilly, C., (2004). The Nutritional Trace Metals. Blackwell Publishing, Oxford.
162. Reto, M., Figueira, M. E., Filipe, H. M., and Almeida, C. M. M., (2007). Chemical composition of green tea (Camellia sinensis) infusions commercialized in Portugal. Plant Food. Hum. Nutr. 62:139–144.
163. Ryan, J., Rashid, A., Torrent, J., Yau, S. K., Ibrikci, H., Sommer, R., and Erenoglu, E. B., (2013). Micronutrient constraints to crop production in the Middle East-West Asia region:Significance, research, and management. Adv. Agron. 122:1–84.
164. Sabhapondit, S., Karak, T., Bhuyan, L. P., Goswami, B. C., and Hazarika, M., (2012). Diversity of catechin in North East Indian tea cultivars. Sci. World J. (in press; doi:10.1100/2012/485193)
165. Sarkar, A., Aronson, K. J., Patil, S., Hugar, L. B., and vanLoon, G. W., (2012). Emerging health risks associated with modern agriculture practices:A comprehensive study in India. Environ. Res. 115:37–50.
166. Salahinejad, M., and Aflaki, F., (2010). Toxic and essential mineral elements content of black tea leaves and their tea infusions consumed in Iran. Biol. Trace Elem. Res. 134:109–117.
167. Saltman, P. D., and Strause, L. G., (1993). The role of trace minerals in Osteoporosis. J. Am. Coll. Nutr. 12:384–389.
168. Seenivasan, S., Manikandan, N., Muraleedharan, N. N., and Selvasundaram, R., (2008). Heavy metal content of black teas from south India. Food Control. 19(8):746–749.
169. Serpen, A., Pelvan, E., Alasalvar, C., Mogol, B. A., Yavuz, H. T., Gökmen, V., Özcan, N., and Özçelik, B., (2012). Nutritional and functional characteristics of seven grades of black tea produced in Turkey. J. Agric. Food. Chem. 60:7682–7689.
170. Shaltout, A. A., Abdel-Aal, M. S., Welz, B., and Castilho, I. N. B., (2013). Determination of Cd, Cu, Ni, and Pb in black tea from Saudi Arabia using graphite furnace atomic absorption spectrometry after microwave-assisted acid digestion. Anal. Lett. 46(13):2089–2100.
171. Shen, F., and Chen, H., (2008). Element composition of tea leaves and tea infusions and its impact on health. Bull. Environ. Contam. Toxicol. 8:300–304.
172. Sherif, M. K., Awadallah, R. M., and Amrallah, A. H., (1980). Determination of trace elements of Egyptian crops by neutron activation analysis. J. RadioAnal. Chem. 57(1):53–60.
173. Sofuoglu, S. C., and Kavcar, P., (2008). An exposure and risk assessment for fluoride and trace metals in black tea. J. Hazard. Mater. 158(2–3):392–400.
174. Soomro, M. T., Zahir, E., Mohiuddin, S., Khan, A. N., and Naqvi, I. I., (2008). Quantitative assessment of metals in local brands of tea in Pakistan. Pak. J. Biol. Sci. 11:285–289.
175. Soylak, M., Tuzen, M., Souza, A. S., das Graças, M., Korn, A., and Costa Ferreira, S. L., (2007). Optimization of microwave assisted digestion procedure for the determination of zinc, copper and nickel in tea samples employing flame atomic absorption spectrometry. J. Hazard. Mater. 149(2):264–268.
176. Srividhya, B., Subramanian, R., and Raj, V., (2011). Determination of lead, manganese, copper, zinc, cadmium, nickel and chromium in tea leaves. Int. J. Pharm. Pharm. Sci. 3:257–258.
177. Street, R., Száková, J., Drábek, O., and Mládková, L., (2006). The status of micronutrient (Cu, Fe, Mn, Zn) in tea and tea infusion in selected samples imported to the Czeck Republic. Czeck J. Food Sci. 25(2):62–71.
178. Szymczycha-Madeja, A., Welna, M., and Pohl, P., (2012). Elemental analysis of tea and their infusion by spectrometric method. TrAC, Trends Anal. Chem. 35:165–181.
179. Szymczycha-Madeja, A., Welna, M., and Pohl, P., (2015). Determination of essential and non-essential elements in green and black teas by FAAS and ICP OES simplified multivariate classification of different tea products. Microchem. J. 121:122–129.
180. Takahashi, M., Nakanishi, S., Kawasaki, S., Nishizawa, N. K., and Mori, S., (2001). Enhanced tolerance of rice to low iron availability in alkaline soils using barley nicotianamine aminotransferase genes. Nat. Biotechnol. 19:466–469.
181. Tautkus, S., Kazlauskas, R., and Kareiva, A., (2004). Determination of copper in tea leaves by flame atomic absorption spectrometry. Chemija 15(4):49–52.
182. Tokalıoğlu, Ş., and Gürbüz, F., (2010). Selective determination of copper and iron in various food samples by the solid phase extraction. Food Chem. 123(1):183–187.
183. Tow, P., Cooper, I., Partridge, I., and Birch, C., (2011). Rainfed Farming Systems. Springer, Dordrecht, The Netherlands.
184. Tripathi, B., and Platel, K., (2013). Feasibility in fortification of sorghum (Sorghum bicolor L. Moench) and pearl millet (Pennisetum glaucum) flour with iron. Food Sci. Technol. 50(1):220–225.
185. Uçar, G., Bakircioglu, D., and Kurtulus, Y. B., (2014). Determination of metal ions in water and tea samples by flame-AAS after pre-concentration using sorghum in nature form and chemically activated. J. Anal. Chem. 69(5):420–425.
186. Unice, K. M., Monnot, A. D., Gaffney, S. H., Tvermoes, B. E., Thuett, K. A., Paustenbach, D. J., and Finley, B. L., (2012). Inorganic cobalt supplementation:Prediction of cobalt levels in whole blood and urine using a biokinetic model. Food Chem. Toxicol. 50(7):2456–2461.
187. U.S Centers for Disease Control, ATSDR. (2000). Toxicological profile for Manganese. Available online from http://www.atsdr.cdc.gov/toxprofiles/tp151.html
188. US AF (US Air Force). (1990). Copper. In:The Installation Program Toxicology Guide. Wright-Patterson Air Force Base, Ohio, Vol. 5, pp. 1–43.
189. Varela-Moreiras, G., Murphy, M. M., and Scott, J. M., (2009). Cobalamin, folic acid, and homocysteine. Nutr. Rev. 67:S69–S72.
190. Velu, G., Ortiz-Monasterio, I., Cakmak, I., Hao, Y., and Singh, R. P., (2014). Bio-fortification strategies to increase grain zinc and iron concentrations in wheat. J. Cereal Sci. 59(3):365–372.
191. Visioli, F., and Hagen, T. M., (2007). Nutritional strategies for healthy cardiovascular aging:Focus on micronutrients. Pharm. Res. 55:199–206.
192. Wachira, F. N., Kamunya, S., Karori, S., Chalo, R., and Maritim, T., (2013). The tea plants:botanical aspects. Tea in Health and Disease Prevention 3–17.
193. Wadhwa, S. K., Tuzen, M., Kazi, T. G., Soylak, M., and Hazer, B., (2014). Polyhydroxybutyrate-b-polyethyleneglycol block copolymer for the solid phase extraction of lead and copper in water, baby foods, tea and coffee samples. Food Chem. 152:75–80.
194. Waqar, A., and Mian, A. A., (2008). Levels of selected heavy metals in black tea varieties consumed in Saudi Arabia. Bull. Environ. Contam. Toxicol. 81:101–104.
195. Wei, Y., Shohag, M. I., Wang, Y., Lu, L., Wu, C., and Yang, X., (2012). Effect of zinc sulfate fortification in germinated brown rice on seed zinc concentration, bioavailability and seed germination. J. Agric. Food. Chem. 60(7):1871–1879.
196. Wei, Y., Shohag, M. J. I., Ying, F., Yang, X., Wu, C., and Wang, Y., (2013). Effect of ferrous sulfate fortification in germinated brown rice on seed iron concentration and bioavailability. Food Chem. 138(2–3):1952–1958.
197. Welna, M., Szymczycha-Madeja, A., and Pohl, P., (2013). A comparison of samples preparation strategies in the multi-elemental analysis of tea by spectrometric methods. Food Res. Int. 53:922–930.
198. Welna, M., Szymczycha-Madeja, A., Stelmach, E., and Pohl, P., (2012). Speciation and fractionation of elements in tea infusions. Crit. Rev. Anal. Chem. 42(4):349–365.
199. Wenlock, R. W., Buss, D. H., and Dixon, E. J., (1979). Trace nutrients. Manganese in British foods. Br. J. Nutr. 41(2):253–261.
200. WHO (World Health Organization). (1975). International Standard of Drinking Water, Geneva.
201. WHO. (1993). Guidelines for drinking water quality. 2nd ed. World Health Organisation, Geneva.
202. WHO. (2003a). Copper in drinking-water. Background document for preparation of WHO Guidelines for drinking-water quality. World Health Organization, Geneva (WHO/SDE/WSH/03.04/88).
203. WHO. (2003b). Iron in drinking-water. Background document for preparation of WHO Guidelines for drinking-water quality. World Health Organization, Geneva (WHO/SDE/WSH/03.04/8).
204. WHO. (2006). Guidelines on food fortification with micronutrients. World Health Organization and Food and Agriculture Organization of the United Nations. Geneva, Switzerland.
205. WHO. (2008). World Health Organization. Worldwide prevalence of anemia 1993 to 2005. Geneva, Switzerland.
206. WHO. (2009). Boron in drinking-water. Background document for preparation of WHO Guidelines for drinking-water quality. World Health Organization, Geneva (WHO/HSE/ WSH/09.01/2).
207. Woldegebriel, D., (2007). Levels of Essential and Non-Essential Metals in Commercially Available Ethiopian Black Teas. Graduate Project Submitted to the Department of Chemistry, Addis Ababa Unversity, School of Graduate Studies, Ethiopia.
208. Woldegebriel, Y., Chandravanshi B. S., and Wondimu T., (2012). Concentration levels of metals in vegetables grown in soils irrigated with river water in Addis Ababa, Ethiopia. Ecotoxicol Environ Saf. 77:57–63.
209. Wong, M. H., Zhang, Z. Q., Wong, J. W. C., and Lan, C. Y., (1998). Trace metal contents (Al, Cu and Zn) of tea:Tea and soil from two tea plantations, and tea products from different provinces of China. Environ. Geochem. Health. 20:87–94.
210. Wróbel, K., Wróbel, K., and Urbina, E. M. C., (2000). Determination of total aluminum, chromium, copper, iron, manganese, and nickel and their fractions leached to the infusions of black tea, green tea, Hibiscus sabdariffa, and Ilex paraguariensis (Mate) by ETA-AAS. Biol. Trace Elem. Res. 78:271–280.
211. Xiong, C., Chen, X., and Liu, X., (2012). Synthesis, characterization and application of ethylenediamine functionalized chelating resin for copper pre-concentration in tea samples. Chem. Eng. J. 203(1):115–122.
212. 2-MIL-125 (Ti) modified carbon paste electrode. Sensors and Actuators B:Chemical. 201:274–280.
213. Yasmeen, F., Aleem, R., and Anwar, J., (2000). Determination of iron and manganese in tea samples by flame atomic absorption spectroscopy. J. Chem. Soc. Pak. 22:94–97.
214. Yaylalı-Abanuz, G., and Tüysüz, N., (2009). Heavy metal contamination of soils and tea plants in the eastern Black Sea region, NE Turkey. Environ. Earth. Sci. 59(1):131–144.
215. Yemane, M., Chandravanshi, B. S., and Wondimu, T., (2008). Levels of essential and non-essential metals in leaves of the tea plant (Camellia sinensis L.) and soil of Wushwush farms, Ethiopia. Food Chem. 107(3):1236–1243.
216. Zheng, H., Li, J. L., Li, H. H., Hu, G. C., and Li, H. S., (2014). Analysis of trace metals and Perfluorinated compounds in 43 representative tea products from South China. J. Food. Sci. 79(6):1123–1129.
217. Zhong, Wen-Si., Ren, T., and Zhao, Li-Jiao., (2016). Determination of Pb, Cd, Cr, Cu, and Ni in Chinese tea with high-resolution continuum source graphite furnace atomic absorption spectrometry. J. Food Drug Anal. 24(1):46–55.
218. Zhu, D., and Jing, Y., (2013). Green tea consumption and diabetes. Ed., V. R. Preedy. Tea in Health and Disease Prevention. pp. 675–680, Elsevier.
219. Zhu, Y., Kuroiwa, T., Narukawa, T., Inagaki, K., and Chiba, K., (2012). Proficiency test in Japan for the elements in tea-leaf powder. TrAC, Trends Anal. Chem. 34:152–160.
220. Zhu, Y., Narukawa, T., Inagaki, K., Kuroiwa, T., and Chiba, K., (2011). Development of a certified reference material (NMIJ CRM7505-a) for the determination of trace elements in tea leaves. Anal. Sci. 27:1149–1155.
221. Ziarati, P., Khoshhal, Z., Asgarpanah, J., and Qomi, M., (2013). Contaminations of heavy metals in tea leaves, finished tea products and liqour in Gilan Province, Iran. Int. J. Farming. Allied. Sci. 2(13):383–387.
222. Zielinska-Dawidziak, M., and Siger, A., (2012). Effect of elevated accumulation of iron in ferritin on the antioxidants content in soybean sprouts. Eur. Food Res. Technol. 234:1005–1012.
223. Zioła-Frankowska, A., Frankowski, M., Novotny, K., and Kanicky, V., (2014). Comparison of the level of boron concentrations in black teas with fruit teas available on the polish market. Sci. World J. 2014:1–8.