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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus

12 Issues per year


IMPACT FACTOR 2016: 1.012

CiteScore 2017: 1.08

SCImago Journal Rank (SJR) 2017: 0.495
Source Normalized Impact per Paper (SNIP) 2017: 0.495

Online
ISSN
2196-7156
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The Influence of Cytochrome C on the Polycondensation of Silicic Acid

D. Gebauer / Jürgen Woenckhaus
Published Online: 2009-09-25 | DOI: https://doi.org/10.1524/zpch.2006.220.3.371

Summary

The polycondensation kinetics of silicic acid was measured cryoscopically in a temperature interval between 5°C and 35°C. Unlike polyamines such as polyallylamine, polylysine or polyarginine, catalitical amounts of Cytochrom c have a distinct retarding influence on the polycondensation kinetics. The Arrhenius analysis of the experimental reaction rates with and without Cytochrome c determines an invariant activation energy of EACC/wo = (69.9 ± 0.7) kJ/mol, while the pre-exponential factors differ by Δκ0 = (1 × 108 ± 8 × 107) s−1. The latter can be attributed to a three-times pejoration of a sterical factor, which then indicates, that the adsorption of reactive silicic acid oligomers on the protein is dominating the reaction rate.

Keywords: Silicic Acid; Polycondensation Kinetics; Cytochrome C; Biomineralization; Cryoscopy; Sterical Factor

About the article

Received: 2005-12-13

Accepted: 2006-01-11

Published Online: 2009-09-25

Published in Print: 2006-03-01


Citation Information: Zeitschrift für Physikalische Chemie, Volume 220, Issue 3/2006, Pages 371–381, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.2006.220.3.371.

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