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Effect of Rhamnolipid Solubilization on Hexadecane Bioavailability: Enhancement or Reduction?

Effect of Rhamnolipid Solubilization on Hexadecane Bioavailability: Enhancement or Reduction?

Yang Liu, Guangming Zeng, Hua Zhong, Zhiquan Wang, Zhifeng Liu, Min Cheng, Guansheng Liu, Xin Yang, Shaoheng Liu

J Hazard Mater. 2017 Jan 15;322(Pt B):394-401.

PMID: 27773441

Abstract:

In this study, liquid culture systems containing rhamnolipid-solubilized, separate-phase, and multi-state hexadecane as the carbon source were employed for examining the effect of rhamnolipid solubilization on the bioavailability of hexadecane. Experimental results showed that the uptake of rhamnolipid-solubilized hexadecane by Pseudomonas aeruginosa ATCC 9027, a rhamnolipid producing strain, was enhanced compared to the uptake of mass hexadecane as a separate phase, indicating rhamnolipid solubilization increased the bioavailability of hexadecane for this bacterium. For Pseudomonas putida CICC 20575 which does not produce but degrade rhamnolipid, the uptake of either rhamnolipid-solubilized hexadecane or multi-state hexadecane was inhibited. The reduction of bioavailability was assumed to be the consequence of the blocking effect caused by the partition of rhamnolipid molecules at the hexadecane-water interface. The results show that how rhamnolipid solubilization changes the bioavailability of hexadecane depends on the bacterial compatibility to rhamnolipid. The study adds insight into the knowledge of biosurfactant-associated bioavailability of hydrophobic organic compounds (HOCs), and is of importance for application of biosurfactants in bioremediation of HOCs.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP544763	Hexadecane		544-76-3	Price

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