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- W2108575381 abstract "The catalytic hydrolysis of p-nitrophenyl acetate (PNPA) by 4(5)-imidazolylmethylated poly(vinyl alcohol) (IMPVA) was studied. When IMPVA (documentclass{article}pagestyle{empty}begin{document}$ overline {{rm DP}} approx 2000 $end{document}, imidazolyl content: 2,7 mole-%) was used as catalyst, the rate of catalytic hydrolysis showed substrate saturation phenomena and could be described by a Michaelis-Menten kinetics with Km = 3,3 mmol·l−1 and kcat = 9,4·10−3 min−1. Km and kcat increased with increasing imidazolyl content in the IMPVA (imidazolyl content = 13,0 mole-%, Km = 53 mmol·l−1 and kcat = 8,7·10−2 min−1). Addition of ethanol to the reaction mixture resulted in a decrease in Km and kcat (ethanol conc. = 50 vol.-%, Km = 1,5 mmol·l−1 and kcat = 1,7·10−3 min−1). In the presence of boric acid, Km increased, while kcat varied in a complicated manner. The catalytic properties of IMPVA were found to be also affected by the degree of polymerization, and when an IMPVA of documentclass{article}pagestyle{empty}begin{document}$ overline {{rm DP}} approx 500 $end{document} with an imidazolyl content of 2,7 mole-% was used as catalyst, substrate saturation phenomena were not observed." @default.
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- W2108575381 date "1978-10-01" @default.
- W2108575381 modified "2023-09-27" @default.
- W2108575381 doi "https://doi.org/10.1002/macp.1978.021791002" @default.
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