Production of Metabolites with Antioxidant and Emulsifying Properties by Antarctic Strain Sporobolomyces salmonicolor AL1

Abstract

The Sporobolomyces salmonicolor AL(1) Antarctic strain was cultivated and two bioproducts were obtained: exopolysaccharide and biomass. The biologically active substances ergosterol, torularhodin, torulene, β-carotene and CoQ(10) were extracted from the biomass and were quantified as follows: ergosterol 5.2 ± 0.2 mg/g, torularhodin 458.3 ± 24.5 μg/g, torulene 273.7 ± 14.5 μg/g, β-carotene 129.2 ± 7.3 μg/g and coenzyme Q(10) (CoQ(10)) 236.1 ± 12.1 μg/g. Their antioxidant activity was estimated according to the cathode voltammetry method. The most pronounced antioxidant activity (according to trolox) was exhibited by β-carotene 3.78, followed by CoQ(10) 3.60, both of them being the main contributors to the total extract activity of 3.19. The biologically active metabolites in combination with exoglucomannan as emulsifier were used for the creation of model emulsion systems characterised by great stability. The absorption of UVA rays by the model emulsions was studied.

Recovery of metallo-tolerant and antibiotic resistant psychrophilic bacteria from Siachen glacier, Pakistan

“…Our results are strongly supported by works of previous scientists [31, 62] who identified potent bacterial isolates from diverse cold habitats, a large number of which produced antimicrobial compounds. However, our results are in contrast to the research carried out by many scientists [63–66] on Antarctic, arctic, Argentine soil and marine organisms. The low temperature habitats are less explored as compared to mesophiles and data regarding antimicrobial compounds is very rare.…”

C/N ratio and carbon source-dependent lipid production profiling in Rhodotorula toruloides

“…Regarding xylose cultivation, the favored torularhodin and torulene production at higher C/N might surpass the low r lip and r x values obtained, by offering product diversification and possible profitability as these non-conventional carotenoids are not produced at a large scale and only a number of yeasts and fungi can synthesize them naturally (Kot et al 2018). Furthermore, studies show that they possess interesting properties against cancer (Du et al 2016), microbial activity (Ungureanu et al 2016), and as antioxidants (Dimitrova et al 2013). In terms of processes, results obtained with R. toruloides show a possibility to control the profile of carotenoids during cultivation throughout the change on C/N ratio and dilution rate.…”

Improved plant resistance to drought is promoted by the root‐associated microbiome as a water stress‐dependent trait

“…The production of exopolymeric substances (EPS) by some of the selected strains may also have played a role in supporting plant growth under water stress, contributing to the formation of a hydrophilic biofilm around the roots acting as an additional sheath to protect the root system from soil hardness (Rossi et al ., ; Xu et al ., ). EPS on root tissues could also act as mild emulsifiers protecting biological membranes and contributing to scavenging reactive oxygen species, hence enhancing plant resistance to water stress (Llamas et al ., ; Dimitrova et al ., ).…”