Degradation of hexadecane by Pseudomonas aeruginosa with the mediation of surfactants: Relation between hexadecane solubilization and bioavailability. (November 2016)

• Record Type: Journal Article
• Authors: Zhong, Hua; Wang, Zhiquan; Liu, Zhifeng; Liu, Yang; Yu, Mingda; Zeng, Guangming
• Is Part Of: International biodeterioration & biodegradation. Volume 115(2016)
• Page Start: 141
• Page End: 145
• Publication Date: 2016-11
• Subjects: Pseudomonas aeruginosa ATCC 9027 -- Triton X-100 -- SDBS -- Pseudo-solubilized hexadecane -- Degradation; Biodegradation -- Periodicals; Bioremediation -- Periodicals; Biodegradation -- Periodicals; Biodégradation -- Périodiques; Biorestauration -- Périodiques; Electronic journals; 620.11223
• DOI: 10.1016/j.ibiod.2016.08.008
• Languages: English
• ISSNs: 0964-8305

Abstract

Abstract: Degradation of hexadecane by Pseudomonas aeruginosa ATCC 9027 mediated with octylphenol ethoxylate (Triton X-100) or sodium dodecylbenzene sulfonate (SDBS) was studied to examine the relation between surfactant pseudo-solubilization and bioavailability for hydrophobic organic compounds (HOCs). For either of the surfactants, degradation of hexadecane in pseudo-solubilized form was delayed compared to hexadecane as a separate phase, showing a reduced availability of pseudo-solubilized hexadecane. When hexadecane with a quantity significantly higher than the pseudo-solubility was used as the carbon source, Triton X-100 enhanced the degradation whereas SDBS still showed inhibitory effect. Degradability test shows that Triton X-100 as the sole carbon source could be partially degraded, whereas SDBS could not. These results indicate that a reduction in HOC bioavailability may occur for surfactant-mediated bioremediation process, likely due to the barrier effect of surfactants at water-HOC interface. Graphical abstract: Pseudo-solubilization by surfactants reduces hexadecane bioavailability due to the blocking effect of surfactant. Highlights: Pseudo-solubilization by surfactants reduces hexadecane bioavailability. Triton X-100 is degradable and enhances hexadecane degradation in complex system. Blocking effect of surfactants accounts for reduction in hexadecane bioavailability.