Influence of withering, including leaf handling, on the manufacturing and quality of black teas - A review

Food Chemistry

Volumn 60, Issue 4, 1997, Pages 573-580

  Tomlins, K I ^a   Mashingaidze, A ^a  

^a Tea Res Foundation Central Africa   (Malawi)

Author keywords

[No Author keywords available]

Indexed keywords

ARTICLE; CLIMATE; FERMENTATION; FOOD ANALYSIS; FOOD HANDLING; FOOD PROCESSING; FOOD QUALITY; MOISTURE; PLANT LEAF; TEA;

CAMELLIA SINENSIS;

EID: 0030757655     PISSN: 03088146     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0308-8146(97)00035-6     Document Type: Review

References (82)

1. Agarwal, B. (1989). Factors affecting quality of tea during processing. S. L. J. Tea Sci., 58, 64-72.
2. Bailey, R. G., Nursten, H. E. & McDowell, I. (1993). The chemical oxidation of catechins and other phenolics: A study of the formation of black tea pigments. J. Sci. Food Agric., 63, 455-464.
3. Bhatia, I. S (1962). Chemical aspects of withering. Two and a Bud, 9, 26-30.
4. Bhatia, I. S. (1964). The role of chemistry in tea manufacture. Two and a Bud, 11, 109-117.
5. Bhatia, I. S. (1965). Nitrogen metabolism of detached tea shoots. I. Changes in amino acids and amides of tea shoots during withering. J. Sci., Food Agric., 16, 759-769.
6. Bhuyan, L. P. & Mahanta, P. K. (1989). Studies on fatty acid composition in tea Camellia sinensis. J. Sci. Food Agric., 46, 325-330.
7. Bokuchava, M. A. & Skobeleva, N. I. (1980). The biochemistry and technology of tea manufacture. CRC Critical Reviews, Food Sci. Nutrit, 303-370.
8. Boruah, T. C. (1988). A package deal for withering. In Tea Technology - Today and Tomorrow, Proc. 30th Tocklai Conf. 1988, Tea Research Association, Assam, India, 114-122.
9. Burton, S. J. A. (1995). Leaf handling project, Part of B.Sc degree in Environmental Management, Silsoe College, Cranfield University, U.K.
10. Choudhury, R. (1970). Withering, Serial No 185, K2 file, November 1970, Tocklai Experimental Station, Assam, Indian.
11. Cloughley, J. B. (1979). The effect of temperature on enzyme activity during the fermentation phase of black tea manufacture. J. Sci. Food Agric., 31, 920-923.
12. Cloughley, J. B. (1981). Storage deterioration in Central African Tea: the effect of some production variables on theaflavin degradation. J. Sci. Food Agric., 32, 1229-1234.
13. Dev Choudhury, M. N. & Bajaj, K. L. (1979). Incorporation of 14C-compounds into amino acids and polyphenols of excised tea shoots. Plant Biochem. J., 6, 16-23.
14. Dev Choudhury, M. N. & Bajaj, K. L. (1980a). Biochemical changes during withering of tea shoots. Two and a Bud, 27, 13-16.
15. Dev Choudhury, M. N. & Bajaj, K. L. 1980b). Role of chlorophylls, amino acids and sugars in tea. Two and a Bud, 27, 16-20.
16. Finger, A. (1994). In-vitro studies on the effect of polyphenol oxidase and peroxidase on the formation of polyphenolic black tea constituents. J. Sci. Food Agric., 66, 293-305.
17. Hampton, M. G. (1992). Production of black tea. In Tea -Cultivation to Consumption, ed. K. C. Willson & M. N. Clifford. Chapman and Hall, London, pp. 459-511.
18. Hatanaka, A., Kajiwar, T. & Sekiya, J. (1984). Enzyme oxygenative cleavage reaction of linolenic acid in leaves, chloroplastic lipoxgenase and fatty acid hydroperoxidelyase in tea leaves. In The Metabolism, Structure and Function of Plant Lipids, ed. P. K. Stumpf, J. B. Mudd & W. D. Nes. Plenum Publishing Corporation, New York, pp. 391-398.
19. Hazarika, M. & Mahanta, P. K. (1983). Some studies on carotenoids and their degradation in black tea manufacture. J. Sci. Food Agric., 34, 1390-1396.
20. Hazarika, M., Sukhomoy, K., Chakravarty, K. & Mahanta, P. K. (1984). Studies on thearubigin pigments in black tea manufacturing systems. J. Sci. Food Agric., 35, 1208-1218.
21. Hilton, P. J. (1975). Manufacture of tea in Central Africa. Tea Research Foundation of Central Africa, Mulanje, Malawi.
22. Howard, G. E. (1978). The volatile constituents of tea. Food Chem., 4, 97-106.
23. Johnson, A. L. (1987). Some comments on withering. Tea Research Foundation (Central Africa), P.O. Box 51, Mulanje, Malawi (unpublished).
24. Johnson, A. L. (1990). Manufacture - Section 14, Tea Planters Handbook. Tea Research Foundation (Central Africa), P.O. Box 51, Mulanje, Malawi.
25. Keegal, E. L. (1950). Quick withering at high temperature. TRIP Ceylon Bulletin, 32, 32-33.
26. Kramer, J. P. & Kozlowski, T. T. (1979). Physiology of Woody Plants. Academic Press, London, 787pp.
27. Kumsinda, A. (1993). Preliminary trails on the effect of chemical withering time. Tea Research Foundation (Central Africa), Malawi (unpublished).
28. Madanhire, J. (1993). The effect of short withers on the quality of made tea. Tea Research Foundation (Central Africa), Malawi (unpublished).
29. Mahanta, P. K. & Boruah, S. (1989). Relationship between process of withering and aroma characteristics of black tea. J. Sci. Food Agric., 40, 461-468.
30. Mahanta, P, K., Boruah, S. K., Boruah, H. K. & Kalita, J. N. (1993). Changes of polyphenol oxidase and peroxidase activities and pigment composition of some manufactured black teas (Camellia sinensis L.). J. Agric Food Chem., 41, 272-276.
31. Mashingaidze, A. (1995). Effect of different moisture contents at maceration on black tea quality. Proceedings of the first regional tea seminar, 22-23 March 1995, Blantyre, Malawi. ed. A. M. Whittle & F. R. B. Khumal, Tea Research Foundation, Malawi, pp. 133-135.
32. Melican, N. J. T. & Mallows, R. (1992). Occurrence and causes of red leaf in plucked tea before withering. Teacraft Technical Services Company, Bedford, UK.
33. Motoda, S. (1979). Formation of aldehydes from amino acids by polyphenol oxidase. J. Ferment. Technol., 57, 395-399.
34. Nikolaishvilli, D. K. & Adeishvilli, N. E. (1966). Chromatographic study of the quantitative changes in tea leaf pigments during production of black tea. Byull Uses. Nauch, Iss. Ins Chai Pro., 2, 50-60.
35. Obanda, M. and Owuor, P. O. (1991). Changes in the quality of black teas due to duration of chemical wither and type of drier in a large scale commercial factory. Annual Report 1991, pp. 141-148. Tea Research Foundation of Kenya, Kericho.
36. Obanda, M. & Owuor, P. O. (1994). Effects of wither and plucking methods on the biochemical and chemical parameters of selected Kenyan tea. Discovery and Innovation, 6, 190-197.
37. Opie, S. C., Robertson, A. & Clifford, M. N. (1990). Black tea thearubigins - their HPLC separation and preparation during in-vitro oxidation. J. Sci. Food Agric., 50, 547-561.
38. Orchard, J. E. (1991). Technical Report 1988-91. ODA TCO, Tea Research Foundation of Kenya, P.O. Box 820, Kericho, Kenya, 126pp.
39. Owuor, P. O. & Obanda, M. (1992a). Effects of chemical wither temperatures on black tea quality. Annual Report 1992, p. 93. Tea Research Foundation of Kenya.
40. Owuor, P. O. & Obanda, M. (1992b). Effect of fermentation duration of leaf chemically withered at warm temperature, ambient temperature and mixture of the two on black tea quality. Annual Report 1992, pp. 93-96. Tea Research Foundation of Kenya.
41. Owuor, P. O. & Obanda, M. (1992c). Changes in tea quality due to degree of physical wither, fermentation time and post manufacture storage time (commercial factory). Annual Report 1992, pp. 86-89. Tea Research Foundation of Kenya.
42. Owuor, P. O. & Obanda, M. (1993). Effects of different processing methods on quality of black tea. Annual Report 1993, pp. 116-122. Tea Research Foundation of Kenya.
43. Owuor, P. O. & Orchard, J. E. (1989). Withering. Annual Report 1989, pp. 89-102. Tea Research Foundation of Kenya.
44. Owuor, P. O. & Orchard, J. E. (1991). Variations in black tea quality due to changing withering techniques in smallholder factories. Tea, 12, 32-40.
45. Owuor, P. O. & Orchard, J. E. (1992). Effects of storage time in a two-stage withering process on the quality of seedling black tea. Food Chem., 45, 45-49.
46. Owuor, P. O, Reeves, S. G. & Wanyoko, J. K. (1986). Correlations of theaflavin contents and valuations of Kenyan black teas. J. Sci. Food Agric., 37, 507-513.
47. Owuor, P. O., Tsushida, T., Horita, H. & Murai, T. (1987). Effects of artificial withering on the chemical composition and quality of black tea. Trop. Sci., 27, 159-166.
48. Owuor, P. O, Wanjiera, J. O., Njeru, K. E., Munavu, R. M. & Bhatt, B. M. (1989). Comparison of chemical composition and quality changes due to different withering methods in black tea manufacture. Trop. Sci., 29, 207-213.
49. Perera, K. P. W. C. & Wickremasinghe, R. L. (1972). Properties of tea polyphenol oxidase. Tea Quart., 43, 153-163.
50. Renold, W., Nof-Muller, R., Keller, U., Willhalm, B. & Ohloff, C. (1974). An investigation of tea aroma. I. New volatile black tea constituents. Helv. Cham. Acta., 57, 1301-1308.
51. Roberts, E. A. H. (1948). Calculation of moisture content of withered leaf from percentage wither. Serial No. 19, K2 file, March 1948, Tocklai Experimental Station, Assam, India.
52. Roberts, E. A. H. (1962). The chemistry of tea manufacture. J. Sci. Food Agric., 9, 381-390.
53. Roberts, E. A. H. (1963). The phenolic substances of manufactured tea. X. The creaming down of tea liquors. J. Sci. Food Agric., 14, 700-705.
54. Roberts, G. R. & Sanderson, G. W. (1966). Changes undergone by the free amino acids during manufacture of black tea. J. Sci. Food Agric., 17, 182-188.
55. Robertson, A. (1992). The chemistry and biochemistry of black tea production - the non-volatiles. In Tea - Cultivation to Consumption, eds K. C. Willson & M. N. Clifford. Chapman and Hall, London, pp. 555-597.
56. Robinson, J. M. & Owuor, P. O. (1992). Tea Aroma. In Tea -Cultivation to Consumption, eds K. C. Willson & M. N. Clifford. Chapman and Hall, London, pp. 603-647.
57. Saijo, R. (1977). Mechanisms of developing black tea aroma with special reference to alcoholic compounds. J. A. R. Q., 11, 216-220.
58. Saijo, R. & Takeo, T. (1973). Volatile and non-volatile forms of aroma compounds in tea leaves and their changes due to injury. Agric. Biol. Chem., 37, 146-163.
59. Sanderson, G. W. (1964). The theory of withering in tea manufacture. Tea Quart., 35, 146-163.
60. Sanderson, G. W. & Graham, H. N. (1973). On the formation of black tea aroma. J. Agric. Food Chem., 21, 576-585.
61. Sanderson, G. W., Co, H. & Gonzalez, J. G. (1971). Biochemistry of tea fermentation: the role of carotenes in black tea aroma formation. J. Food Sci., 36, 231-236.
62. Selvendran, R. R., Reynolds, J. & Gilliard, T. (1978). Production of volatiles by degradation of lipids during manufacture of black tea. Phytochem., 17, 233-236.
63. Takeo, T. (1984a). Effect of the withering process on volatile compound formation during black tea manufacture. J. Sci. Food Agric., 35, 84-87.
64. Takeo, T. (19846). Withering effect on the aroma formation found during oolong tea manufacture. Agric. Biol. Chem., 48, 1083-1085.
65. Takeo, T. & Mahanta, P. K. (1983). Why CTC tea is less fragrant. Two and a Bud, 30, 76-77.
66. Takeo, T. & Tsushida, T. (1980). Changes in lipoxygenase activity in relation to lipid degradation in plucked tea shoots. Phytochem., 19, 2521-2522.
67. Taylor, S. J. & McDowell, I. J. (1991). Rapid classification by HPLC of plant pigments in fresh tea (Camellia sinensis L) leaf. J. Sci. Food Agric., 57, 287-291.
68. Taylor, S., Baker, D., Owuor, P., Orchard, J., Othieno, C. & Gay, C. (1992). A model for predicting black tea quality from the carotenoid and chlorophyll composition of fresh green tea leaf. J. Sci. Food Agric., 58, 185-191.
69. Trimanna, A. S. L. & Wickremasinghe, R. L. (1965). Studies on quality and flavour of tea. 2. The carotenoids. Tea Quart., 3, 115-121.
70. Trinick, J. M. (1962). Withering - its effect during manufacture and on made tea. Two and a Bud, 9(2), 31-34.
71. Ullah, M. R. (1984a). A reappraisal of withering process in black tea manufacture. I. Physical and chemical withers and their effects on tea liquors. Two and a Bud, 31, 20-24.
72. Ullah, M. R. (1984b). A reappraisal of withering process in black tea manufacture. II. Chemical wither in current practices of artificial withering and its effects on tea liquors. Two and a Bud, 31, 24-27.
73. Ullah, M. R. (1985). Lowering of enzyme activity of tea leaf on storage and its effects on quality of made teas. Two and a Bud, 32, 53-56.
74. Ullah, M. R. & Roy, P. C. (1982). Effect of withering on the polyphenol oxidase level in the leaf. J. Sci. Food Agric., 33, 492-495.
75. Ullah, M. R., Gogoi, N. & Boruah, D. (1984). The effect of withering on fermentation of tea leaf and development of liquor characters of black teas. J. Sci. Food Agric., 33, 1142-1147.
76. Watanbe, I, S., Saigo, T. & Nakano, T. (1983). Improvement of tea quality by the management of wet leaves. I. Development and field trial of an experimental machine for removing water adhering to tea leaves. Res. Bull. Aichi Ken Agric. Res. Centre, 15, 145-150.
77. Wemyss, A. (1973). Mechanical loading of withering troughs. World Crops, 25, 314-316.
78. Wickremasinghe, R. L. & Peresa, U. H. (1966). The blackness of tea and colour of tip. Tea Quart., 37, 232-235.
79. Wilkie, A. S. (1995). Leaf handling study. TRF QNL, 120, 26-38.
80. Wright, A. J. & Fishwick, M. J. (1979). Lipid degradation during manufacture of black tea. Phytochem., 18, 1511-1513.
81. Yamanishi, T. (1967). Flavour of black tea. Japan Agric. Res. Quart., 2, 25-32.
82. Yamanishi, T., Kobayashi, A., Sata, H., Nakanura, H., Oswa, K., Uchida, A., Mori, S. & Saijo, R. (1966). Flavour of black tea. Part IV. Changes in flavour constituents during the manufacture of black tea. Agric. Biol. Chem., 30, 784-792.