NDLI: Production of extracellular polymeric substances from Rhodopseudomonas acidophila in the presence of toxic substances

Content Provider	Springer Nature Link
Author	Sheng, Guo Ping Yu, Han Qing Yue, Zheng Bo
Copyright Year	2005
Abstract	A hydrogen-producing photosynthetic bacteria strain, Rhodopseudomonas acidophila, was used to investigate the production of extracellular polymeric substances (EPS) in the presence of toxic substances and the effect of toxicants on bacterial surface characteristics. Addition of the toxic substances including Cu(II), Cr(VI), Cd(II) and 2,4-dichlorophenol (2,4-DCP) stimulated the production of EPS but reduced the cell dry weight. At concentrations of 30 mg l−1 Cu(II), 40 mg l−1 Cr(VI), 5 mg l−1 Cd(II) and 100 mg l−1 2,4-DCP, the EPS content increased by 5.5, 2.5, 4.0 and 1.4 times, respectively, than the control. These toxic substances also greatly influenced the proteins/carbohydrates ratio of EPS. The ratios in the presence of toxic substances were always higher than that of control. Furthermore, under toxic conditions, the increase in the protein content far exceeded than that of others in EPS, suggesting that extracellular proteins could protect cells against toxic substances. The toxic substances significantly changed the surface characteristics and flocculation ability of R. acidophila, such as surface energy, relative hydrophobicity and free energy of adhesion.
Starting Page	216
Ending Page	222
Page Count	7
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	69
Issue Number	2
e-ISSN	14320614
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-11-12
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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