Theppakorn, T. and Kanasawud, P. and Halling, P.J. (2003) Effect of solid-state buffers on the catalytic activity of papain in low water media. Enzyme and Microbial Technology, 32 (7). pp. 828-836. ISSN 0141-0229Full text not available in this repository. (Request a copy from the Strathclyde author)
The catalytic activity of papain in the synthesis of Z-Gly-Phe- NH2 in tert-butanol has been studied in the presence of solid- state acid-base buffers (acids and their sodium salts). All buffer pairs tested reduced the reaction rate compared with the control, particularly the most acidic and basic (assessed by either aqueous pK(a) or the response of an organic phase indicator). The highest rates, close to the control, were found with glutamic acid/glutamate-Na, PIPES/PIPES-Na and NaH2PO4/Na2HPO4. However, these pairs were unable to erase the pH memory phenomenon, or to overcome the effect of spiking with acetic acid. Hence, at least these buffers do not seem to be able to affect the protonation state and catalytic activity of papain. In the last aqueous solution before drying, the presence of activating agents (cysteine plus EDTA) was more important than buffer ions.
|Keywords:||papain, solid-state buffer, catalytic activity, low water media Organic-solvents, amino-acids, esterification, biocatalysis, ph, phase, ionizations, dipeptides, alcohols, diols, Chemistry, Biochemistry, Applied Microbiology and Biotechnology, Biotechnology|
|Subjects:||Science > Chemistry|
|Department:||Faculty of Science > Pure and Applied Chemistry|
|Depositing user:||Users 16 not found.|
|Date Deposited:||10 Mar 2006|
|Last modified:||29 Apr 2016 07:34|