Protocatechuic acid grafted onto chitosan: Characterization and antioxidant activity.

In this study, protocatechuic acid (PA) was grafted onto chitosan (CS) by a carbodiimide mediated cross-linking reaction. The structural characterization, physical property and antioxidant activity of PA grafted CS (PA-g-CS) was investigated. As results, three copolymers with different grafting ratios (61.

Structure, physical property and antioxidant activity of catechin grafted Tremella fuciformis polysaccharide.

In this study, structural characterization, physical property and antioxidant activity of catechin grafted Tremella fuciformis polysaccharide (catechin-g-TPS) were investigated. Crude polysaccharides were isolated from the fruit bodies of T. fuciformis and further purified on DEAE-52 and Sepharose CL-4B chromatography to afford a main purified fraction (named TPS).

Poly[[(μ2-4,4'-bipyridyl-κ(2) N:N')bis-{μ2-N-[2-(2-hy-droxy-benzo-yl)carbamo-thio-yl]acetamidato-κ(4) O,N,O':S}bis-(nitrato-κ(2) O,O')dicadmium] di-methyl-formamide tetra-solvate].

The asymmetric unit of the title complex, {[Cd2(C10H10N3O3S)2(C10H8N2)(NO3)2]·4C3H7NO} n , consists of one Cd(II) cation, one N-[2-(2-hy-droxy-benzo-yl)carbamo-thio-yl]acetamidate ligand, half a 4,4'-bipyridyl ligand, one coordinating nitrate anion and two di-methyl-formamide solvent mol-ecules of crystallization. The bipyridine ligand is completed by inversion symmetry. The metal cation exhibits a distorted penta-gonal-bipyramidal coordination geometry provided by two O and one N atoms of the thio-semicarbazide ligand, two O atoms of the nitrate anion, one S atom of a neighbouring thio-semicarbazide ligand and one 4,4'-bi-pyridine N atom.