Production and characterization of novel marine black yeast's exopolysaccharide with potential antiradical and anticancer prospects

Topological structure, rheological characteristics and biological activities of exopolysaccharides produced by Saccharomyces cerevisiae ADT

Saccharomyces cerevisiae ADT is an edible fungus, with limited research on its exopolysaccharides (EPS). Three types of exopolysaccharides (EPS60, EPS80, and EPS100) were obtained through multiple purification steps using varying concentrations of ethanol in this study. The topological structure, rheological properties, and biological characteristics of EPS were investigated. High performance liquid chromatography (HPLC), Fourier transform infrared spectroscopy (FTIR), and nuclear magnetic resonance (NMR) analyses indicated that the three EPS are primarily made up of mannose with a small amount of glucose. Acetyl groups were also found, along with the presence of α-type pyranose and β-type pyranose. The Congo Red test and X-ray diffraction results reflected the absence of a triple helix structure and crystal properties. Atomic force microscopy (AFM) revealed the self-assembly of three exopolysaccharides into various topological structures under different concentration gradients, and a clear network structure of entangled chains was observed. EPS60, EPS80 and EPS100 displayed pseudoplasticity, weak gel behavior and thermal stability. Significantly, EPS exhibited antioxidant activity in a dose-dependent manner and showed no acute cytotoxicity to RAW264.7 and HEK293T cells. Therefore, EPS in this study is anticipated to be utilized in natural antioxidants, medications, and functional materials.

In Silico Analysis of Anti-Cancer Activity of Exopolysaccharide Isolated from Novel Pseudolagarobasidium acaciicola through Mass Production, Gel Permeation Separation, and Compositional Analysis

Bacteria, fungi, and algae are examples of microorganisms that synthesize polysaccharides, which are macromolecules that belong to the carbohydrate class. Production of polysaccharides represents an alternative to chemical and plant-derived compounds that could be used for human well-being which requires implementation of different methods standardized during the extraction and purification process. In the current investigation, Pseudolagarobasidium acaciicola, a novel fungal source of exopolysaccharide (EPS) was used which produced 2773.23 ± 100.39 mg/L when cultured under pre-optimized composed medium for 7 days under submerged culture conditions. Biochemical estimation of crude polysaccharides revealed the presence of carbohydrates, protein, reducing sugar, least phenolics and no flavonoids. Partially purified EPS (ppEPS) was subjected to monosaccharide analysis, molecular weight determination and structural confirmation using FTIR and LCMS analysis. The presence of maltose, fructose, xylose, galactose, glucose, raffinose and sorbose was evident in the ppEPS using HPTLC at 285 nm, with molecular weight of dextran 70 (tentative). Characterization revealed the presence of functional groups including -OH, -COO, C-O-C and C-O with compounds like cellulose, phosphate and 3'-Sialyl-N-acetyllactosamine with glycan as the main structural form. Hence, our hypothesis is: the fungal strain may be used as a novel source of glycan and explore more possibilities for enhanced recovery of EPS important for further drug discovery and formulation programs. Based on existing research on the anti-cancerous characteristics of β-Glycans, an in silico study was carried out, which suggested that β-Glycans may operate more potent against its receptor CLEC7A than the oral chemotherapy drug imatinib.

Microbial exopolysaccharides: Unveiling the pharmacological aspects for therapeutic advancements

Microbial exopolysaccharides (EPSs) have emerged as a fascinating area of research in the field of pharmacology due to their diverse and potent biological activities. This review paper aims to provide a comprehensive overview of the pharmacological properties exhibited by EPSs, shedding light on their potential applications in various therapeutic areas. The review begins by introducing EPSs, exploring their various sources, significance in microbial growth and survival, and their applications across different industries. Subsequently, a thorough examination of the pharmaceutical properties of microbial EPSs unveils their antioxidant, immunomodulatory, antimicrobial, antidepressant, antidiabetic, antiviral, antihyperlipidemic, hepatoprotective, anti-inflammatory, and anticancer activities. Mechanistic insights into how different EPSs exert these therapeutic effects have also been discussed in this review. The review also provides comprehensive information about the monosaccharide composition, backbone, branches, glycosidic bonds, and molecular weight of pharmacologically active EPSs from various microbial sources. Furthermore, the factors that can affect the pharmacological activities of EPSs and approaches to improve the EPSs' pharmacological activity have also been discussed. In conclusion, this review illuminates the immense pharmaceutical promise of microbial EPS as versatile bioactive compounds with wide-ranging therapeutic applications. By elucidating their structural features, biological activities, and potential applications, this review aims to catalyze further research and development efforts in leveraging the pharmaceutical potential of microbial EPS for the advancement of human health and well-being, while also contributing to sustainable and environmentally friendly practices in the pharmaceutical industry.