Table of Contents
Biotechnology Research International
Volume 2011, Article ID 238456, 7 pages
http://dx.doi.org/10.4061/2011/238456
Research Article

Improvement of Physiological Characteristic of Selenium-Enriched Candida utilis with Amino Acids Addition

School of Basic Medicine and Biological Science, College of Medicine, Soochow University, Suzhou 215123, China

Received 13 July 2010; Revised 24 August 2010; Accepted 1 September 2010

Academic Editor: Igor Kovalchuk

Copyright © 2011 Ge Xiaoguang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effects of amino acids addition on cell growth, glutathione biosynthesis, glutathione distribution, and the intracellular oxidation-reduction environment of Candida utilis SZU 07-01 during selenium enrichment were investigated in this study. Most amino acids under appropriate concentrations have positive effects on cell growth of the yeast strain, except for phenylalanine and proline, compared with the control without amino acid addition. The bioconversion of selenite to organic selenium induced the reduction of glutathione synthesis and intracellular distribution of glutathione. However, amino acids including cysteine, glutamine, glutamic acid, isoleucine, leucine, and tyrosine could effectively promote the selenium-enriched yeast to elevate glutathione production, especially increasing the intracellular glutathione content. Moreover, addition of these six different amino acids apparently decreased malondialdehyde concentration and recovered the normal intracellular redox environment of the selenium-enriched C. utilis SZU 07-01. The improvement of physiological characteristic of the selenium-enriched yeast by increasing intracellular glutathione content and lowering malondialdehyde content will undoubtedly help to widen application of selenium-enriched yeast as food or feed additives.