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- W2054199056 abstract "The suitability of eleven 4-alkylidene oxazolones for the determination of four hydrolases, alpha-chymotrypsin, trypsin, carboxylesterase and leucine aminopeptidase, was tested. The specific activities were in general low compared with those obtained with the classical substrates but the Kmapp values were also small. Hence, the kcat/Kmapp ratios of the oxazolones, the optimal indicator of activity, remained in the usual range. The high differential absorption coefficients of the oxazolones in the UV range render these substrates very suitable for the determination of active site normalities if the solubilities of the acyl enzymes and the magnitudes of the rapid bursts are sufficient. Since some of the oxazolones fluoresce, the sensitivity of the method may be increased up to 1000 x by fluorescence detection. The titrations may be carried out in organic solvents, e.g. dimethyl sulphoxide, which greatly stabilize the hydrolases. The high specificity of the oxazolones permits active site titrations in the presence of other hydrolases." @default.
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- W2054199056 date "1989-02-01" @default.
- W2054199056 modified "2023-09-23" @default.
- W2054199056 title "4-Alkylidene oxazolones as substrates and inhibitors for sensitive assays of the normality of active sites and the catalytic properties of hydrolases" @default.
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- W2054199056 doi "https://doi.org/10.1016/s0304-4165(89)80021-2" @default.
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