Three-dimensional networks in the 1:2 organic salts 2,2'-biimidazolium bis(3-carboxy-4-hydroxybenzenesulfonate) and 2,2'-bibenzimidazolium bis(3-carboxy-4-hydroxybenzenesulfonate) trihydrate.

The two title compounds of 2,2'-biimidazole (Bim) with 5-sulfosalicylic acid (5-H(2)SSA) and 2,2'-bibenzimidazole (Bbim) with 5-H(2)SSA are 1:2 organic salts, viz. C(6)H(8)N(4)(2+).2C(7)H(5)O(6)S(-), (I), and C(14)H(12)N(4)(2+).

[Effect of podophyllotoxin on human gastric cancer cell line SGC 7901].

Objective: To investigate the effect of podophyllotoxin on human gastric cancer cell line SGC 7901 cells in vitro and in vivo, and to provide evidence for treatment of gastric cancer with podophyllotoxin.

Methods: SGC 7901 cells were treated with podophyllotoxin at various concentrations for different time. MTT assay, colony formation assay, and flow cytometry were performed to determine the effect of podophyllotoxin on the growth and apoptosis of SGC 7901 cells in vitro.

Hydrogen-bonded layers in the 1:2 cocrystal of 2,2'-dithiodibenzoic acid with isonicotinohydrazide.

Cocrystallization of 2,2'-dithiodibenzoic acid with isonicotinohydrazide from methanol solution yields the 1:2 cocrystal 2,2'-dithiodibenzoic acid-isonicotinohydrazide (1/2), C(14)H(10)O(4)S(2) x 2 C(6)H(7)N(3)O. The component molecules are linked by intermolecular O-H..

2,2'-(Imino-dimethyl-ene)dibenz-imid-azol-ium bis-(perchlorate) methanol solvate.

In the title compound, C(16)H(17)N(5) (2+)·2ClO(4) (-)·CH(3)OH, the dihedral angle between the two benzimidazolium ring systems is 34.6 (1)°. The anions and solvent mol-ecules are linked to the cation by N-H⋯O hydrogen bonds.

Two salts of 5-sulfosalicylic acid and 3-aminopyridine.

5-Sulfosalicylic acid (5-SSA) and 3-aminopyridine (3-APy) crystallize in the same solvent system, resulting in two kinds of 1:1 proton-transfer organic adduct, namely 3-aminopyridinium 3-carboxy-4-hydroxybenzenesulfonate monohydrate, C(5)H(7)N(2)(+).C(7)H(5)O(6)S(-).H(2)O or 3-APy.

[Study on optimizing the analysis condition for active compound in Eucommia olive].

The absorption spectroscopic determination of aucubin by condensation with p-dimethylaminobenzaldehyde was optimized in this paper. A high sensitive method was established and the linearity range of the method was from 4.5 to 45 microg x mL(-1).

[Study on technology of extracting geniposidic acid from Eucommia ulmiodes and its application].

Objective: To study the optimum technology of extracting bioactive component named geniposidic acid in Eucommia Ulmiodes by orthogonal test.

Method: An orthogonal test table L16(4(5)) was used with the factors of extracting time, temperature, times, ethanol consistency and the ratio of solid to liquid. The content of geniposideic acid was determined by RP-HPLC.

[Pharmacognostic identification of Cryptolepis buchanaii].

Objective: To supply basis for the establishment of quality standard of Cryptolepis buchanaii.

Method: Characters of crude drugs, microscopic characteristic as well as UV spectrum of the herb were studied.

Result: Laticifers were found in the cortex and pith of the stem; much papillary non-glandular hair was found covering the stomata in the sub-cuticle of the leaf.

[Study on adsorption of tea polyphenol and caffine with polyamide resin].

The performance of adsorption of tea polyphenol and caffine with polyamide resin was investigated. The results obtained by spectrophotometry and HPLC show that the ability of adsorption of tea polyphenol with polyamide is stronger than that of caffine, in which hydrogen bond plays a very important role. The adsorption amount of caffine is 2.