Metals uptake by live yeast and heat-modified yeast residue

Abstract

This study evaluated the biosorption of Cd 2+ , Cr 3+ , Pb 2+ and Cu 2+ at pHs 3, 4, 5 and 6 for Saccharomyces cerevisiae both alive and biologically inactivated by different heating procedures (oven, autoclave or spray dry technique originated from alcohol industry). The material inactivated by autoclave (IA, at 120°C, 30 min) had the best performance for metals uptake: 1.88 ± 0.07 (Cu 2+ ), 2.22 ± 0.02 (Cr 3+ ) and 1.57 ± 0.08 g kg -1 (Pb 2+ ). For Cd 2+ ; while the material inactivated by spray dry (RY) presented the higher sorption capacity, 2.30 ± 0.08 g kg -1 . The sorption studies showed that the biosorbent materials presented different sorption capacities and an ideal sorption pH. The sorption sites were investigated by potentiometric titration and FT-IR and showed that different heating processes used to inactivate biological samples produce materials with different characteristics and with a diverse sorption capacity due to modification of the available sorption sites. This suggests that inactivation by heating can be an alternative to improve the performance of biosorbents. The main sorption sites for each material were phenolic for live yeast (LY) and carboxylic for yeast inactivated by heating in an autoclave (IA). Sorção de metais por levedura viva e resíduo de levedura modificado por processos de aquecimento RESUMOSaccharomyces cerevisiae viva e biologicamente inativada por diferentes processos de aquecimento (forno, autoclave ou spray dry) foram empregadas para biossorção de Cd 2+ , Cr 3+ , Pb 2+ e Cu 2+ em pHs 3, 4, 5 e 6. O material inativado por autoclave (IA, a 120°C, 30 min) teve o melhor desempenho para a sorção de metais: 1,88 ± 0,07 (Cu 2+ ), 2,22 ± 0,02 (Cr 3+ ) e 1,57 ± 0,08 g kg -1 (Pb 2+ ). Para Cd 2 + o material inativado por spray dry (RY) apresentou a maior capacidade de sorção, 2,30 ± 0,08 g kg -1 . Os estudos de sorção mostraram que os materiais

Biosorption of lanthanum and samarium by viable and autoclaved mycelium of Botryosphaeria rhodina MAMB‐05

“…The FT‐IR transmittance spectra of live and ALFM exhibited the same absorption bands, with the exception that the VLFM presented an extra absorption peak near 2,400 cm −1 (Figure ). The origin of this band could be from ketenes, O=C=O, characteristic of wood decay fungi . Peaks in the 3,000–3,300 cm −1 range are characteristic of ‐NH (amides) and ‐OH vibrations, while those within the band region 900–1,800 cm −1 are characteristic of microbial cell surfaces and correspond to the regions of absorbance of phospholipids and polysaccharides .…”

“…Peaks in the 3,000–3,300 cm −1 range are characteristic of ‐NH (amides) and ‐OH vibrations, while those within the band region 900–1,800 cm −1 are characteristic of microbial cell surfaces and correspond to the regions of absorbance of phospholipids and polysaccharides . Absorbances by amide and polysaccharide moieties were observed at 1,650–1,050 cm −1 , while phospholipids and phosphate groups showed bands in the range of 1,200–1,050 cm −1 …”

Efficient degradation of solid yeast biomass from ethanol industry by Fenton and UV-Fenton processes applying multivariate analysis

“…The peaks 1026-1029 cm -1 were attributed to (C-O-C) -polysaccharides or (C-O), which are not found in the PF residue spectra (Labuto et al, 2015). For the FR, it is possible to observe the band at 1723 cm -1 , indicating the presence of lipids and fatty acids (C=O) -ester (Shi et al, 2010).…”

“…Yeasts are a common organic matter employed as a biosorbent and this specific YB has been previously used as a biosorbent for organic and inorganic species in our research group (Labuto et al, 2015;Trama et al, 2014).…”

Bioremediation and extracellular synthesis of copper nanoparticles from wastewater using Yarrowia lipolytica AUMC 9256

“…At acidic pH 2, the sorption sites, whatever the type of the biomass, are surrounded by hydronium ions (H 3 O + ) and negative charge intensity was reduced. This suggests that the mechanism is related to covalent bonds and not to an electrostatic interaction in this pH value (Labuto et al, 2015). As the pH increases, relatively more amounts of OH ions within the solution will present and more ligands, such as carboxyl, hydroxyl, amino and phosphoryl groups that carry more negative charges were exposed and may bind cationic metals (Mihaiescu et al, 2016).…”