Influence of a Rhamnolipid Biosurfactant on the Transport of Bacteria through a Sandy Soil.

Applied and Environmental Microbiology
G BaiR M Miller

Abstract

The objective of this study was to investigate the influence of an anionic rhamnolipid biosurfactant on the transport of bacterial cells through soil under saturated conditions. Three cell types with various hydrophobicities, i.e., Pseudomonas aeruginosa ATCC 9027, ATCC 27853, and ATCC 15442, were used in this study. In a series of experiments, columns packed with sterile sand were saturated with sterile artificial groundwater for 15 h, and then 3 pore volumes of (sup3)H-labeled bacterial suspensions with various rhamnolipid concentrations was pumped through the column. This was followed by 4 pore volumes of the rhamnolipid solution alone. The measured bacterial cell breakthrough curves were optimized by using an advection-dispersion transport model incorporating two-domain reversible sorption (instantaneous and rate limited) and with two first-order sink terms for irreversible adsorption. The influence of the rhamnolipid on the surface charge densities of the bacteria and the porous medium was also investigated. The results show that the rhamnolipid enhanced the transport of all cell types tested. For example, the rhamnolipid increased the recovery of the most hydrophilic strain, ATCC 9027, from 22.5 to 56.3%. Similarly, the r...Continue Reading

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Citations

Jul 20, 2007·Applied Microbiology and Biotechnology·XingZhong YuanXinMiao Xu
Oct 31, 2002·Applied and Environmental Microbiology·Sheryl H StregerPaul B Hatzinger
Feb 14, 2006·The Journal of Antimicrobial Chemotherapy·Lígia RodriguesRosário Oliveira
Sep 28, 2007·Applied Microbiology and Biotechnology·Hua ZhongFang Yi Ren
Jul 5, 2006·International Journal of Environmental Research and Public Health·Moïse NolaNorbert Kemka
Mar 17, 2009·Colloids and Surfaces. B, Biointerfaces·Palashpriya DasRamkrishna Sen
Dec 15, 2017·Biotechnology and Bioengineering·Guansheng LiuZhifeng Liu
Jul 28, 2019·Journal of Basic Microbiology·Suganya KannanMurugan Marudhamuthu
Aug 15, 2014·Environmental Science & Technology·Eleonora Congiu, José-Julio Ortega-Calvo
Feb 16, 2011·Environmental Science & Technology·Christine StumppPiotr Maloszewski
Mar 4, 2015·Environmental Science & Technology·Celia Jimenez-SanchezJosé-Julio Ortega-Calvo
Sep 18, 2021·Proceedings of the National Academy of Sciences of the United States of America·Judy Q YangHoward A Stone
Oct 17, 2002·Environmental Science & Technology·Devamita ChattopadhyayJohn T Wilson

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