Effect of monorhamnolipid on the degradation of n-hexadecane by Candida tropicalis and the association with cell surface properties
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- 作者：Guangming Zeng (12) zgming@hnu.cn
Zhifeng Liu (12)
Hua Zhong (12)
Jianbing Li (3)
Xingzhong Yuan (12)
Haiyan Fu (4)
Ying Ding (12)
Jing Wang (12)
Meifang Zhou (12) - 关键词：Rhamnolipids – ; Hydrocarbons – ; Candida tropicalis – ; Cell surface hydrophobicity – ; Cell surface zeta potential
- 刊名：Applied Microbiology and Biotechnology
- 出版时间：May 2011
- 出版年：2011
- 期刊代码：18_0175-7598
- 类别：bio
- 卷：90
- 期：3
- 页码：1155-1161
- 数据来源：sp
摘要
The effect of monorhamnolipid (monoRL) on the degradation of n-hexadecane by Candida tropicalis was investigated in this study. The concentration of hexadecane, cell growth, cell surface hydrophobicity (CSH), cell surface zeta potential (CSZP), and FT-IR spectra of cellular envelope were tested to determine the mechanisms. MonoRL at the initial concentrations of 11.4, 19, and 38 mg/l improved the degradation of hexadecane, and 19 mg/l was the best concentration. However, 114 mg/l monoRL suppressed the biodegradation probably because of the reduced bioavailability of hexadecane caused by the micelles. The presence of monoRL changed the cell surface properties, which was demonstrated by the increased CSH, the increased CSZP, and the changed FT-IR spectra of cellular envelope at 680 and 620 cm−1. The changes of cell surface properties may be a reason for the enhanced biodegradation of hexadecane by the yeast. The results indicate the potential application of monoRL in the bioremediation of hydrocarbons.