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Volumn 121, Issue 41, 1999, Pages 9487-9496

Lipase-silicone biocomposites: Efficient and versatile immobilized biocatalysts

Author keywords

[No Author keywords available]

Indexed keywords

SILICONE; TRIACYLGLYCEROL LIPASE;

EID: 0032706857     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja9924849     Document Type: Article
Times cited : (99)

References (82)
  • 43
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    • (b) Mon, K. Synlett 1995, 11, 1097.
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    • Tyman, J. H. P., Ed.; Royal Society of Chemistry: Cambridge
    • (d) Gill, I. In Synthesis in Lipid Chemistry; Tyman, J. H. P., Ed.; Royal Society of Chemistry: Cambridge, 1996; p 175.
    • (1996) Synthesis in Lipid Chemistry , pp. 175
    • Gill, I.1
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    • note
    • 11
  • 65
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    • note
    • 12 or on the large scale more conveniently by transfer dehydrogenation with acetone, using Zn(II)/Sn(II) as catalysts.
  • 66
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    • note
    • -1 in 0.1 or 0.2 M metaphosphate buffer, pH 7, containing 20 mM calcium acetate, 5 °C), at an applied protein load of 10% w/w of PHOMS, gave the following activity immobilizations: papain, 96%; thermolysin, >99%; almond β-D-glucosidase, 98%; C. rugosa lipase-B, >99%; S. chromofuscus phospholipase D, 98%. Adsorption took 10-30 min, and less than 3% leaching of protein/activity was detected upon washing (3 × 10-fold volumes of buffer, 5 °C, 1 h).
  • 67
    • 0344144934 scopus 로고    scopus 로고
    • note
    • -1.
  • 68
    • 0344576344 scopus 로고    scopus 로고
    • note
    • The silanol content of PHOMS varied between 6 and 12.3 mmol/g (46-93% of theoretical maximum), depending upon the mode of preparation and the aging and drying conditions. Wet processing at low pH and/or high temperature, and/or dry calcination affords a low-silanol/high-siloxane PHOMS. Conversely, low temperature and/or high pH treatment afford highly silanolated products. Silanol coverage was determined by titration with LAH, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC).
  • 69
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    • note
    • 18 This condensation is catalyzed by Sn(II), Fe(III), Ti(IV), Zn(II), Pt(IV), and other metal salts.
  • 70
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    • Silicon-Based Polymer Science: A Comprehensive Resource
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    • (a) Zeigler, M.; Fearon, F. W. G. Silicon-Based Polymer Science: A Comprehensive Resource; Advances in Chemistry Series, 224; American Chemical Society: Washington, DC, 1990.
    • (1990) Advances in Chemistry Series , vol.224
    • Zeigler, M.1    Fearon, F.W.G.2
  • 72
    • 0344576343 scopus 로고    scopus 로고
    • note
    • It was calculated that C. rugosa lipase constituted less than 1% w/w of the total protein content of the crude enzyme preparation. Crude C. rugosa enzyme contains a number of lipase components. The adsorption of total lipolytic activity was followed, and no attempt was made to profile the adsorption of the various lipase species.
  • 73
    • 0344144933 scopus 로고    scopus 로고
    • note
    • -1.
  • 76
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    • note
    • -1 were exposed to 12 cycles of washing (15-30 mL of 50 mM phosphate, pH 7, containing 5% v/v 2-propanol, 15-20 h). 4-NPB hydrolysis and Lowry assays indicated that 6, 12, 13, 9, and 16% of lipase activity was desorbed respectively and that the adsorbates retained 91, 80, 83, 87, and 77% of their initial activities.
  • 78
    • 0344576342 scopus 로고    scopus 로고
    • note
    • Titration with lithium aluminum hydride indicated that the silanol functionality available for cross-linking was reduced by 13-21% upon protein adsorption.
  • 82
    • 0344576341 scopus 로고    scopus 로고
    • note
    • We have routinely fabricated lipase-PHOMS-silicone catalysts on a multikilo scale, and have estimated the costs of producing monoliths, granulates, coated particulates, and foams to be in the range of $20-35 per kilo of composite. The prices of commercial food and catalyst grade lipases range over $100-2000 per kilo. For medium to high catalytic density immobilizates (5-15% w/w lipase loading), the additional cost of immobilization is about 9-30%. Considering that the activities and long-term stabilities of the composites can exceed those of the native enzymes by 1-50-fold and 10-30-fold respectively, leading to performance improvements of 10-1500-fold, it can be seen that the economics are rather attractive.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.