Thermodynamics of the conversion of aqueous xylose to xylulose.

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Thermodynamics of the conversion of aqueous xylose to xylulose. Abstract Text:

Y B Tewari,D K Steckler,R N Goldberg,

The thermodynamics of the conversion of aqueous xylose to xylulose has been investigated using high-pressure liquid chromatography (HPLC) and microcalorimetry. The reaction was carried out in aqueous phosphate buffer over the pH range 6.8-7.4 using solubilized glucose isomerase with MgSO(4) as a cofactor. The temperature range over which this reaction was investigated was 298.15-342.15 K. A combined analysis of both the HPLC and microcalorimetric data leads to the following results at 298.15 K for the conversion process: DeltaG degrees = 4389 +/- 31 J mol(-1), DeltaH degrees = 16090 +/- 670 J mol(-1), and DeltaC(p) degrees = 40 +/- 23 J mol(-1) K(-1). The temperature dependence of the equilibrium constant for the reaction is expressed as R ln K = -4389/298.15 +16090[(1/298.15)-(1/T)]+40[(298.15/T)-1 + ln(T/298.15)]. Comparisons are made with literature data.

Thermodynamics of the conversion of aqueous xylose to xylulose. Publishing Authors By Initials

YB Tewari,DK Steckler,RN Goldberg,

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Thermodynamics of the conversion of aqueous xylose to xylulose. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Biophysical chemistry

VOLUME: 22

Page Numbers: 181-5

Journal Abbreviation: Biophys. Chem.

ISSN: 0301-4622

DAY: 29

MONTH: Aug

YEAR: 1985

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LANGUAGE: eng

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Grant and Affiliation Information for Thermodynamics of the conversion of aqueous xylose to xylulose.

AFFILIATION: Chemical Thermodynamics Division, Center for Chemical Physics, National Bureau of Standards, Gaithersburg, MD 20899, U.S.A.

Country: Netherlands

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MEDLINETA: Biophys Chem

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