Correlation analysis of nutrients and microorganisms in soils with polyphenols and total flavonoids of Houttuynia cordata / 中国中药杂志

The relationship of nutrients and microorganisms in soils with polyphenols and total flavonoids of Houttuynia cordata were investigated by measuring nutrients, enzyme activity, pH, concentrations of microbe phospholipid fatty acids (PLFAs) in soils, and determining concentrations of polyphenols and total flavonoids of H. cordata. The research is aimed to understand characteristics of the planting soils and improve the quality of cultivated H. cordata. The soils at different sample sites varied greatly in nutrients, enzyme activity, pH, microbic PLFAs and polyphenols and all flavonoids. The content of total PLFAs in sample sites was following: bacteria > fungi > actinomyces > nematode. The content of bacteria PLFAs was 37.5%-65.0% at different sample sites. Activities of polyphenol oxidease, concentrations of available P and content of PLFAs of bacteria, actinomyces and total microorganisms in soils were significantly and positively related to the concentrations of polyphenols and total flavonoids of H. cordata, respectively (P < 0.05) . The Content of fungi PLFAs in soils was significantly and negatively related to concentrations of polyphenols and total flavonoids of H. cordata, respectively (P < 0.05). This study provides evidence that effectiveness of the soil nutrient, which may be improved due to transformation of soil microorganisms and enzymes to N and P in the soils, was beneficial to adaptation of H. cordata adapted to different soil conditions, and significantly affects metabolic accumulation of polyphenols and flavonoids of H. cordata.

Chemical constituents of Psammosilene tunicoides and bacteriostatic activity / 中国中药杂志

<p><b>OBJECTIVE</b>To study the chemical constituents and bacteriostatic activity of Psammosilene tunicoides.</p><p><b>METHOD</b>Such methods as silica gel column chromatography and gel column chromatography were adotped separate and purify the compounds, and their structures were indentified on the basis of their spectral data and physicochemical properties.</p><p><b>RESULT</b>Ten compounds were separated from ethanol extracts and identified as methyl-4-hydroxybenzoate (1), N-methylsaccharin (2), 3-hydroxy-4-methoxybenzoic acid (3), germanicol (4), tricosanoic acid (5), octacosane (6), amber acid (7), succinic acid (8), stellarine A (9), and oleanane-12-ene-3alpha, 16alpha-two hydroxy-23,28-acid (10).</p><p><b>CONCLUSION</b>All compounds except compound 10 were separated from P. tunicoides for the first time. Compounds 8 and 9 showed the bacteriostatic activity to a certain extent.</p>