Antarctic yeast Cryptococcus laurentii (AL₆₅): biomass and exopolysaccharide production and biosorption of metals

Abstract

BACKGROUND Pollution by heavy metals poses serious environmental problems and is dangerous to human health, so considerable attention has been given to methods for their removal from industrial effluents. The need for highly effective biosorbents able to remove heavy metals from waste waters, even at the low concentrations which are still toxic for living organisms in ecosystems, is a topical problem. RESULTS In the present study, psychrophilic yeast strain Cryptococcus laurentii (AL65) was used to explore its potential for biosorption of metal ions. The accumulation of biomass was followed continuously in the context of bioreactor cultivation. An adsorption experiment of caustic pretreated biomass was conducted in batch mode with synthetic mixed solution in the pH range 4.7–7.0, and ion concentrations of individual metals were simultaneously determined by inductively coupled plasma ‐ optical emission spectrometry (ICP‐OES). Biosorption abilities were determined for 15 elements: the total amount of adsorbed ions was 68 mg g−1 dry biomass for 10 mg L−1 initial concentration of each element in the solution, and 113 mg g−1 for 20 mg L−1. The highest adsorption capacity was observed in the 20 mg L−1 solution for aluminium, chromium, indium, gallium, iron and bismuth in the range 12–16 mg g−1 dry biomass at an optimal pH of ≈5. CONCLUSION The results on the biosorption ability of Antarctic producer Cryptococcus laurentii (AL65) can be used in the optimization of technological processes for the removal of heavy metals from aqueous solutions. © 2019 Society of Chemical Industry

Fungal bioproducts for petroleum hydrocarbons and toxic metals remediation: recent advances and emerging technologies

“…Downstream processing technologies such as recovery, purification, and characterization in developing bioinoculants do not require high resolution techniques presumably due to their environmental purpose, thus purification steps are not necessarily required. Thus, filamentous and yeast bioinoculants can be adequately recovered by unit operations involving solid/liquid separation such as filtration and centrifugation [41,185]. However, the application of drying techniques can increase the storage feasibility and shelf life of metabolically inactive bioinoculants compared to those with active metabolism.…”

“…In this sense, dimorphic fungi (e.g., black fungi) in their filamentous structure may be more viable to be applied as bioinoculants, because hyphae can penetrate into the contaminated soil matrix pores, which allows greater accessibility and permeation to contaminants between different regions of the mycelium and through the air [101,182]. On the other hand, dimorphic fungi in their yeast-like form may be more viable to be applied in bioprocesses as producers of metabolites to be applied in mycoremediation, because the yeast morphology facilitates biomass recovery [185].…”

Biosorption of Pb (II) And Ni (II) By Protonated Industrial Waste Yeast Biomass

“…Recently biosorption has gained much attention, as this technology utilizes materials or sorbents of biological origin, including bacteria, fungi, yeast, algae, and agricultural wastes. Biosorbents have the capacity to bio-accumulate or adsorb the metals to their surfaces (Rusinova et al, 2020). They can effectively sequester dissolved metal ions out of dilute complex solutions with high efficiency and quickly.…”

Production of water‐soluble sulfated exopolysaccharide with anticancer activity from Anoxybacillus gonensisYK25

“…It has been documented that EPSs obtained from microorganisms find application in areas, such as health, cosmetics, food, and bioremediation. EPS‐producing microorganisms include bacteria, archaea, microalgae, yeasts, and molds 2,4–6 . For example, it has been reported that bacterial strains belonging to genera such as Alcaligenes, Alteromonas, Bacillus, Cobetia, Colwellia, Flavobacterium, Geobacillus, Halomonas, Hyphomonas, Lactobacillus, Leuconostoc, Pseudoalteromonas, Pseudomonas, Rhizobium, Rhodococcus, Shewanella, Sphingomonas, Streptococcus, Vibrio, Xanthomonas, Zooglea , and Zymomonas are capable of producing EPS 6,7 …”