RESUMEN
The solubility of disodium 5'-guanylate heptahydrate (5'-GMPNa2) in binary aqueous methanol solvent mixtures with the temperature ranging from 278.15 to 323.15K was measured by a dynamic method with a laser monitoring observation technique. The solubility data were correlated with the Combined Nearly Ideal Binary Solvent/Redlich-Kister (CNIBS/R-K) model and the modified Jouyban-Acree model, respectively. For the ten groups of data studied, the CNIBS/R-K model was found to provide a more accurate mathematical representation of the experimental data, while the modified Jouyban-Acree model containing provisions for correlating both the solvent composition and temperature.
RESUMEN
In the title compound, C(3)H(5)N(2) (+)·C(7)H(4)NO(4) (-), the benzene ring forms a dihedral angle of 40.60â (5)° with the imidizolium ring. The nitro-benzoate anion is approximately planar: the benzene ring makes dihedral angles of 3.8â (3) and 3.2â (1)° with the nitro and carboxyl-ate groups, respectively. In the crystal structure, the cations and anions are linked by inter-molecular N-Hâ¯O hydrogen bonds, forming a zigzag chain along the b axis.
RESUMEN
In the crystal structure, the title compound (also called dicumyl peroxide), C(18)H(22)O(2), lies on a center of symmetry. The COOC plane including the di-oxy group makes a dihedral angle of 79.10â (5)° with the phenyl ring. An inter-molecular C-Hâ¯π inter-action is observed between the phenyl groups.
RESUMEN
In this paper, the advance of polymeric materials applied in the development of traditional Chinese medicine (TCM) and natural products was reviewed. Especially the research progresses in use of the polymeric membranes, polymeric flocculating agents, polymeric sorbents and polymeric drug delivery system (DDS) in the separation and preparation of herb and TCM were discussed in details. In addition, the future develorment of polymeric materials in TCM preparation was also discussed.