Fulvic Acid Promotes the Reduction of Hexavalent Chromium by <i>Shewanella putrefaciens</i> via N-acylated-_L-homoserine Lactones-Mediated Quorum Sensing.

ABSTRACT: Extracellular electron transfer is crucial in the microbial reduction of hexavalent chromium [Cr(VI)], and N-acylated-_L-homoserine lactones (AHLs) could accelerate this process. In this study, fulvic acid (FA) was used as an electron shuttle to enhance the microbial reduction process via stimulating extracellular electron transfer efficiency. Compared with 9,10-anthraquinone-2-sulfonic acid (AQS), FA had a stronger positive effect on Cr(VI) reduction by S. putrefaciens, showing the ability of stimulating S. putrefaciens to release AHLs. The concentrations of C6-HSL, C8-HSL and 3OC10-HSL increased by 11.79 ng/L, 19.82 ng/L and 3.01 ng/L after the addition of 2% FA. The bioinformation analysis indicated that AHLs could regulate the synthesis of electron shuttles by <

SUBMITTER: Zheng X 

PROVIDER: S-EPMC12473820 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature