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- W177920003 abstract "Reactions were started by injecting the nitrophenyl ester into a stoppered vial immersed in a constant-temperature bath (4/sup 0/C) containing a mixture of /sup 16/O plus /sup 18/O-ethanol, ..cap alpha..-chymotrypsin, and buffer. As the reaction proceeded, samples were withdrawn and injected into a gas chromatograph connected to a quadrupole mass spectrometer controlled by a data acquisition and processing system. The intensities from individual ions were displayed as a function of time to yield chromatographic peaks. Relative /sup 18/O enrichments were computed from the ratios of the peak areas, and the apparent KIE was then calculated from the ratio of enrichments in alcohol and ester. The values of the plateau KIE were less than or equal to 0.90 for all experiments. The apparent first-order rate constant can also be calculated from the magnitude of the initial burst and the slope of the zero-order absorbence increase. This apparent rate constant varies linearly with the ethanol concentration permitting calculation of the second-order rate associated with the formation of the ethyl ester product. 2 figures, 1 table." @default.
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- W177920003 date "1980-01-30" @default.
- W177920003 modified "2023-09-27" @default.
- W177920003 title "Novel /sup 18/O kinetic isotope effect in an. cap alpha. -chymotrypsin catalyzed transesterification" @default.
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