Structure characterization and immunoactivity on dendritic cells of two neutral polysaccharides from Dictyophora rubrovalvata.

Dictyophora rubrovalvata is a valuable fungus homologous to food and medicine, and its polysaccharide have been gaining increasing attention because of its plentiful activity. However, the structure and activity of its homogeneous polysaccharide have not been studied enough. In this study, two polysaccharides DRP-I and DRP-II were purified from D.

Research progress of Blume polysaccharides: a review of chemical structures and biological activities.

Blume (), listed as one of the 34 precious Chinese medicines, servers a dual purpose as both a medicinal herb and a food source. Polysaccharide is the main active ingredient in , which has pharmacological activities such as immune regulation, anti-oxidation, anti-cancer, anti-aging, neuroprotection and antibacterial activity and so on. The biological activities of polysaccharide (GPs) is closely related to its chemical structures.

Two new glycosides from the root bark of .

Two new glycosides, ethyl--furanosyl-(1→6)-glucopyranoside () and (5-'')-galloyl-ethyl--furanosyl-(1→6)-glucopyranoside (), together with eight known compounds (-) were obtained from the -BuOH extraction of . Their structures were identified the extensive spectroscopic analysis. Compounds , exhibited the anti-inflammation activities, which inhibited the production of NO, TNF- and IL-1 in LPS-induced RAW264.

"MD" method for the precise analysis of the O-acetyl-mannan structure and disclosure of the role in the conformational stability of insulin.

Among the diversified glycan modifications, acylation is one of the most abundant. This modification could be responsible for many of the properties of glycans, such as structural stability and specificity for biological activity. To obtain better insight into the effects of acetylation of glycans on the structure and thermostability of insulin, it is critical to investigate glycans with a high degree of acetylation.

Two new sesquiterpene glycosides from the stems of and their anti-inflammatory activity.

Two new sesquiterpene glycosides, 8,12,15-trihydroxycopacamphan-15---D-glucopyranoside () and dendrobiumane C-11---D-glucopyranoside (), along with three known terpenoids () were isolated from the aerial stems of . Their structures were elucidated based on NMR-spectroscopic and HR-MS analyses. All compounds could reduce the levels of NO, TNF- and IL-1 in LPS-induced RAW264.

Interaction mechanism between luteoloside and corn silk glycans and the synergistic role in hypoglycemic activity.

As the two most principal active substances in the corn silk, polysaccharides and flavonoids, the mechanism of interaction between them has been a topic of intense research. This study provides an in-depth investigation of the interaction mechanism between corn silk glycans and luteoloside (LUT) and the synergistic role that result from this interaction. The interaction mechanism was evaluated by isothermal titration calorimetry (ITC) and circular dichroism (CD), and the synergistic role was evaluated by the expression of glucose transporters (GLUT-1), insulin secretion and surface plasmon resonance (SPR).

Manipulating Carrier Concentration by Self-Assembled Monolayers in Thermoelectric Polymer Thin Films.

Conjugated polymers have attracted considerable attention for thermoelectric applications in recent years due to their plentiful resources, diverse structures, mechanical flexibility, and low thermal conductivity. Herein, we demonstrate a new strategy of modulating charge carrier concentration of chemical-doped polymer films by modifying the substrate with self-assembled monolayers (SAMs). The SAM with a trifluoromethyl terminal group is found to accumulate holes in the polymer thin films, while the SAM with an amino terminal group tends to donate electrons to the polymer films.

New fluorimetric determination of hemoglobin used as a substitute of mimietic peroxidase.

Hemoglobin (Hb) could be used as a substitute of peroxidase in the catalytic oxidation of tetra-substituted amino aluminum phthalocyanine (TAA1Pc) by H2O2. We found that the fluorescence of TAA1Pc (a red-region fluorescent dye with a maximum excitation wavelength at 606 nm and a maximum emission wavelength at 673 nm) could significantly be quenched by H2O2 in the presence of Hb. The value of F0/F (where the relative fluorescence intensity of blank solution and that of the sample solution containing Hb were given by F0 and F, respectively) is linearly related to the concentration of Hb.