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• W2002142735 abstract "A number of bacterial lipases can be immobilized in a rapid and strong fashion on octyl-agarose gels (e.g., lipases from Candida antarctica, Pseudomonas fluorescens, Rhizomucor miehei, Humicola lanuginosa, Mucor javanicus, and Rhizopus niveus). Adsorption rates in absence of ammonium sulfate are higher than in its presence, opposite to the observation for typical hydrophobic adsorption of proteins. At 10 mM phosphate, adsorption of lipases is fairly selective allowing enzyme purification associated with their reversible immobilization. Interestingly, these immobilized lipase molecules show a dramatic hyperactivation. For example, lipases from R. niveus, M. miehei, and H. lanuginosa were 6-, 7-, and 20-fold more active than the corresponding soluble enzymes when catalyzing the hydrolysis of a fully soluble substrate (0.4 mM p-nitrophenyl propionate). Even higher hyperactivations and interesting changes in stereospecificity were also observed for the hydrolysis of larger soluble chiral esters (e.g. (R,S)-2-hydroxy-4-phenylbutanoic ethyl ester). These results suggest that lipases recognize these “well-defined” hydrophobic supports as solid interfaces and they become adsorbed through the external areas of the large hydrophobic active centers of their “open and hyperactivated structure”. This selective interfacial adsorption of lipases becomes a very promising immobilization method with general application for most lipases. Through this method, we are able to combine, via a single and easily performed adsorption step, the purification, the strong immobilization, and a dramatic hyperactivation of lipases acting in the absence of additional interfaces, (e.g., in aqueous medium with soluble substrate). © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 58: 486–493, 1998." @default.
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• W2002142735 date "1998-06-05" @default.
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• W2002142735 title "A single step purification, immobilization, and hyperactivation of lipases via interfacial adsorption on strongly hydrophobic supports" @default.
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• W2002142735 doi "https://doi.org/10.1002/(sici)1097-0290(19980605)58:5<486::aid-bit4>3.0.co;2-9" @default.
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