Isolation, structural modification, characterization, and bioactivity of polysaccharides from Folium Isatidis

Physicochemical and antioxidant properties of Lycium barbarum seed dreg polysaccharides prepared by continuous extraction

“…Four LBSD polysaccharides showed absorption peaks of intensity near 3400 cm −1 and 2900 cm −1 . The characteristic peaks for HBSS, CHSS, DASS, and CASS at 1649, 1586, 1620, and 1575 cm −1 represented their protein content which was consistent with previous study that reported the stretching bands at 1650 and 1550 cm −1 ( Abuduwaili et al, 2022 ). The peaks at 1408 cm −1 (HBSS), 1404 cm −1 (CHSS), 1396 cm −1 (DASS), and 1403 cm −1 (CASS) were related to the existence of C O bond, which indicated the presence of uronic acid ( Cui et al, 2016 , Liu et al, 2017 ).…”

“…The UV spectra of four different polysaccharides fractions had relatively concentrated maximum absorption peaks, implying that the polysaccharide composition was relatively homogeneous ( Fig. 1 B) ( Abuduwaili et al, 2022 ). The wavelengths corresponding to the maximum absorption peaks were 214, 210, 208, and 216 nm, respectively, which might be due to their slightly different internal structures ( Sengkhamparn et al, 2009 ).…”

Structure and Bioactivities of a Novel Polysaccharide Extracted From Dendrobium huoshanense by Subcritical Water

“…In fact, DHPs-1 had more amorphous than crystalline with the crystallinity degree of 18.5%. Actually, this crystal structure is directly determined by the flexibility, solubility, swelling and other properties of polysaccharides ( 15 ). This result suggests the DHPs-1 is a novel polysaccharide, and the reason was attributed to the different species, specific extraction and processing methods.…”

“…The FT-IR spectrum of DHPs-1 showed two characteristic peaks: a strong one at around 3,423 cm −1 representing the intense stretching vibration of O-H bonds, and a weak one at around 2,923 cm −1 representing weak C-H bonds ( Figure 1B ). The areas at 1,734 and 1,636 cm −1 indicated the presence of -COOR and -COOH, respectively, which indicates the existence of galacturonic acid or glucuronic acid and acetyl groups ( 15 ). The band between 950 and 1,200 cm −1 is often called the “fingerprint” of molecules, because the position and intensity of the bands are specific for different polysaccharide.…”

Polysaccharides Composite Materials as Carbon Nanoparticles Carrier

“…An important aspect is that these materials can be obtained in an environmentally friendly way, without the addition of toxic reagents. Numerous studies have proven the bioactivity of polysaccharides and enabled their use in clinical practice, nutrition and dietetics [ 13 , 14 ]. Polysaccharides are characterized by a variety of properties, such as low, medium or high molecular weights, variable polydispersity, the formation of linear or branched structures, monofunctionality (compounds containing only hydroxyl groups) or polyfunctionality (compounds with hydroxyl, carboxyl and/or amino groups), a high degree of chirality, different water solubility, low toxicity and immunogenicity.…”