Characterization of carboxymethylated polysaccharides from Catathelasma ventricosum and their antioxidant and antibacterial activities

Sulfated modification, characterization and bioactivities of an acidic polysaccharide fraction from an edible mushroom Pleurotus eous (Berk.) Sacc.

“…The results of reducing ability of P3a and SP3a indicate that sulfonic acid groups associated with the reducing ketones of polysaccharides can function as electron contributors and respond to free radicals and change them into further steady compounds. The reducing properties are typically related to the existence of reducing ketones, which have been presented to exert antioxidant effects by donating hydrogen atoms to destroy free radical chains ( Liu et al., 2017a , Liu et al., 2017b ). Compared to TLH-3, the reducing power of sulfated T. lobayense polysaccharide (STLH-3) has been improved, which supports our research that the sulfated polysaccharide has higher reducing power than the natural polysaccharides ( Liu et al., 2016 ).…”

“…Recently, increasing attention has been paid on mushroom derived polysaccharides due to their wide range of biological activities ( Li et al., 2016 , 2019 ; Liu et al., 2018 ; Zhang et al., 2015 ), which in turn depends on molecular weight, monosaccharide composition and degree of substitution and solubility ( Gao et al., 2015 ). The molecular modification of polysaccharides has aroused considerable interest and offers an approach to enhance the bioactivities by changing the structural and conformational properties ( Chen and Huang., 2019a , Chen and Huang., 2019b ; Wang et al., 2018b ; Liu et al., 2017a , Liu et al., 2017b ). Among the various chemical modification methods, sulfated modification is usually selected to enhance their biological properties.…”

Structure characterization and antioxidant activity of carboxymethylated polysaccharide from Pholiota nameko

“…Some studies have shown that the substituting degree of chemically modified polysaccharides was positively correlated with biological activity. According toQi et al (2005), the higher DS sulfated polysaccharide form of Ulva pertusa showed greater antioxidant capabilities than those with lower DS Liu et al (2017). reported that the antioxidant activity of cmCVP-1S increased with increasing DS.…”

Effects of different chemical modifications on the structure and biological activities of polysaccharides from Orchis chusua D. Don

“…Compared with the blank control, the maximum absorption wavelength ( λ max ) of the SP, SP‐P, SP‐S, and SP‐A was red‐shifted with the increase of the concentration of NaOH (Figure 5), indicating that these four polysaccharides formed complexes with Congo red. When the NaOH concentration reaches 0.5 mol/l, a blue shift occurs, indicating that NaOH's high concentration causes the unfolding of the polysaccharide conformation, changing from a triple helix to a single strand (Liu & others, 2017 et al., 2017). Among them, only carboxymethylated polysaccharides (SP‐C) have been showing a decreasing trend.…”