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• W2034413251 abstract "Lecitase Ultra has been immobilized on cyanogen bromide agarose (via covalent attachment) and on octyl agarose (via physical adsorption on the hydrophobic support by interfacial activation). Both immobilized preparations have been incubated in dextran sulfate (DS) or polyethylenimine (PEI) solutions to coat the enzyme surface. Then, the activity versus different substrates and under different experimental conditions was evaluated. The PEI coating generally produced a significant increase in enzyme activity, in some cases even by more than a 30-fold factor (using the octyl-Lecitase at pH 5 in the hydrolysis of methyl phenyl acetate). In opposition, the DS coating usually produced some negative effects on the enzyme activity. The rate of irreversible inhibition of the covalent preparation using diethyl p-nitrophenylphosphate did not increase after PEI coating suggesting that the increase in Lecitase activity is not a consequence of the stabilization of the open form of Lecitase. Moreover, the coating greatly increased the stability of the immobilized Lecitase, for example using DS and the covalent preparation, the half-life was increased by a 30-fold factor in 30% acetonitrile. The stabilizing effect was not found in all cases, in certain cases even a certain destabilization is found (e.g., octyl-Lecitase-DS at pH 7). Thus, the effects of the ionic polymer coating strongly depend on the substrate, experimental conditions and immobilization technique employed." @default.
• W2034413251 created "2016-06-24" @default.
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• W2034413251 date "2014-06-01" @default.
• W2034413251 modified "2023-10-18" @default.
• W2034413251 title "Improving the catalytic properties of immobilized Lecitase via physical coating with ionic polymers" @default.
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• W2034413251 doi "https://doi.org/10.1016/j.enzmictec.2014.03.001" @default.
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