Document Detail

Effect of rhamnolipids on initial attachment of bacteria on glass and octadecyltrichlorosilane-modified glass.
MedLine Citation:
PMID:  23201728     Owner:  NLM     Status:  Publisher    
Bacterial attachment on solid surfaces has various implications in environmental, industrial and medical applications. In this study, the effects of rhamnolipid biosurfactants on initial attachment of bacteria on hydrophilic glass and hydrophobic octadecyltrichlorosilane (OTS) modified glass were evaluated under continuous-flow conditions. The bacteria investigated were three Gram-negative species Pseudomonas aeruginosa, Pseudomonas putida, and Escherichia coli, and two Gram-positive species Staphylcoccus epidermidis and Bacillus subtilis. Rhamnolipids, at 10 and 200mg/l, significantly reduced the attachment of all but S. epidermidis on both glass and OTS-modified glass. For S. epidermidis rhamnolipids reduced the attachment on OTS-modified glass but not on glass. Studies were further done to identify the mechanism(s) by which rhamnolipids reduced the cell attachment. The following potential properties of rhamnolipids were investigated: inhibition of microbial growth, change of cell surface hydrophobicity, easier detachment of cells already attached to substratum, and modification of substratum surface properties. Results showed that rhamnolipids were ineffective for the latter two effects. Rhamnolipids, up to 200mg/l, inhibited the growth of B. subtilis, S. epidermidis and P. aeruginosa PAO1 but not the growth of E. coli, P. putida and P. aeruginosa E0340. Also, rhamnolipids tended to increase the hydrophobicity of P. aeruginosa PAO1 and E. coli, decrease the hydrophobicity of P. putida and S. epidermidis, and have no clear effect on the hydrophobicity of B. subtillis. These trends however did not correlate with the observed trend of cell attachment reduction. The responsible mechanism(s) remained unknown.
Maysam Sodagari; Hua Wang; Bi-Min Zhang Newby; Lu-Kwang Ju
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-29
Journal Detail:
Title:  Colloids and surfaces. B, Biointerfaces     Volume:  103C     ISSN:  1873-4367     ISO Abbreviation:  Colloids Surf B Biointerfaces     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-12-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9315133     Medline TA:  Colloids Surf B Biointerfaces     Country:  -    
Other Details:
Languages:  ENG     Pagination:  121-128     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier B.V. All rights reserved.
Department of Chemical and Biomolecular Engineering, The University of Akron, Akron, OH 44325-3906, United States.
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