Affordable Access

deepdyve-link deepdyve-link
Publisher Website

Biodelignification of rice straw by Phanerochaete chrysosporium in the presence of dirhamnolipid.

Authors
  • 1
  • 1 College of Environmental Science and Engineering, Hunan University, 410082, Changsha, People's Republic of China. , (China)
Type
Published Article
Journal
Biodegradation
1572-9729
Publisher
Springer-Verlag
Publication Date
Volume
21
Issue
4
Pages
615–624
Identifiers
DOI: 10.1007/s10532-010-9329-0
PMID: 20131085
Source
Medline
License
Unknown

Abstract

Lignin degradation by white-rot fungi has received considerable attention as a means for reducing accumulation of lignocellulosic wastes in the environment. The stimulatory effect of surfactants on fungal lignocellulose bioconversion also has attracted wide interest. In this study the influence of dirhamnolipid biosurfactant on biodegradation of rice straw by Phanerochaete chrysosporium was investigated. It was shown that the biodelignification process of rice straw can be significantly enhanced by the presence of dirhamnolipid biosurfactant. In particular, the dirhamnolipid at the concentration of 0.007% increased the peak activity of lignin peroxidase (LiP) by 86% without affecting the manganese peroxidase (MnP) activity. The water-soluble organic carbon (WSOC) contents in the straw substrates as well as the microbial growth and activity were effectively improved by dirhamnolipid, while the degradation rate of lignin increased by 54% with dirhamnolipid of 0.007%. Observed chemical structural and morphological changes showed that the straw substrates were delignified in the presence of dirhamnolipid with the formation of terrace-like fragments separated from the inner cellular fibers and the release of simple compounds. Variation partitioning analysis revealed that the dirhamnolipid addition induced a significant straw biodelignification which explained 22.1% (P = 0.013) of the variance.

Statistics

Seen <100 times