Determination of the accumulation, spatial distribution and reduction of Cr in unsaturated Pseudochrobactrum saccharolyticum LY10 biofilms by X-ray fluorescence and absorption methods

Cr(vi) permanently binds to the lipid bilayer in an inverted hexagonal phase throughout the reduction process

“…The LCF results show that despite explicit dependency between a total Cr concentration in samples and DOPE (–HC CH–) concentration, a significant fraction of Cr is bounded to pure DMPC liposomes ( Table 1 ). This result is similar to the one presented on the Cr( vi ) treatment of unsaturated Pseudochrobactrum saccharolyticum LY10 biofilms, 44 except that biofilms derived from bacteria are not only pure lipid membranes. Additionally, it is consistent with the presence of two peaks in the 2 θ range of 28–29.5° in XRD spectra for DMPC + Cr and DMPC : DOPE 100 : 1 + Cr liposomes, which reflect higher ordering on the surface of the liposomes.…”

“… 17 The absorption edge position for the DMPC : DOPE 1 : 1 + Cr sample was 5999.6 eV. A significant absorption edge shift (6.2(3) eV) suggested that our last sample contained Cr( iii ) complex 44 made through the reduction process. A calibration curve for the oxidation state was calculated, shown in Fig.…”

Biofilm-mediated wastewater treatment: a comprehensive review

“…[180,198] Many bacterial biofilms, such as Pseudochrobactrummendocina NR802, Pseudochrobactrumsaccharolyticum LY10 sp., and Arthrobacter sp., have been used to eliminate harmful heavy metal ions and xenobiotic chemicals. [181,204] Furthermore, certain isolates were able to tolerate larger concentrations of manganese and zinc heavy metal ions (2000 mg L -1 ), thus, the advantage of their effectiveness allows for the establishment of a biofilm capable of removing the greatest quantity of heavy metals. [205] To counteract the toxic effects of heavy metals, indigenous microorganisms from heavy metal-contaminated locations evolve a variety of adaptive mechanisms such as heavy metal chelation, biotransformation, and metal efflux from cells.…”

“…180,198 Many bacterial biofilms, such as Pseudochrobactrummendocina NR802, Pseudochrobactrumsaccharolyticum LY10 sp., and Arthrobacter sp., have been used to eliminate harmful heavy metal ions and xenobiotic chemicals. 181,204 Furthermore, certain isolates were able to tolerate larger concentrations of manganese and zinc heavy metal ions (2000 mg L −1 ); thus, the advantage of their effectiveness allows for the establishment of a biofilm capable of removing the greatest quantity of heavy metals. 205…”