Study on the chemical constituents from the herb of Gentianopsis paludosa / 中国中药杂志

<p><b>OBJECTIVE</b>To study the chemical constituents from the herb of Gentianopsis paludosa.</p><p><b>METHOD</b>Column chromatogrophy and spectral analysis were used to isolate and identify the constituents.</p><p><b>RESULT</b>Six compounds were isolated and identified as 1,7-dihydroxy-3,8-dimethoxyxanthone (I), 1-hydroxy-3, 7, 8-trimethoxyxanthone (II), 1, 8-dihydroxy-3, 7-dimethoxyxanthone (III), 1-hydroxy-3, 7-dimethoxyxanthone (IV), beta-sitosterol (V), daucosterol (VI).</p><p><b>CONCLUSION</b>Compounds III-VI were isolated from the plant for the first time.</p>

Chemical constituents of Cyanotis arachnoidea / 药学学报

<p><b>AIM</b>To investigate the chemical constituents of Cyanotis arachnoidea.</p><p><b>METHODS</b>By using chromatographic methods for separation and combination with spectral analysis, their chemical structures were determined.</p><p><b>RESULTS</b>Six compounds were identified as ajugasterone C-20, 22-acetonide (1), 20-hydroxyecdysone-20, 22-acetonide (2), 22-oxo-ajugasterone C (3), 22-oxo-20-hydroxyecdysone (4), beta-sitosterol (5), daucosterol (6).</p><p><b>CONCLUSION</b>Compound 3 is a new compound, 4 was a new natural compound.</p>

Xanthan Gum: Production, Properties and Application / 微生物学通报

Xanthan gum is a microbial, natural high molecular weight polysaccharide produced by a the bacterium Xanthomonas campestris. Due to its exceptional rheological properties, its numerous areas of application cover a broad range. This review focuses on various aspects of xanthan production, properties, degradation, and application.