Drosera peltata Smith var. lunata (Buch.-Ham.) C. B. Clarke as a feasible source of plumbagin: phytochemical analysis and antifungal activity assay

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• 作者：Jun Tian (1)
  Yuxin Chen (1)
  Bingxin Ma (1)
  Jingsheng He (1)
  Jing Tong (1)
  Youwei Wang (1)
  
• 关键词：DPVL ; Antifungal ; Plumbagin ; Isolation ; Quantification
• 刊名：World Journal of Microbiology and Biotechnology
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：30
• 期：2
• 页码：737-745
• 全文大小：323 KB
• 作者单位：Jun Tian (1)
  Yuxin Chen (1)
  Bingxin Ma (1)
  Jingsheng He (1)
  Jing Tong (1)
  Youwei Wang (1)
  
  1. Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Ministry of Education), and Institute of TCM and Natural Products, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, People’s Republic of China
  
• ISSN：1573-0972

文摘

Drosera peltata Smith var. lunata (Buch.-Ham.) C. B. Clarke (DPVL) fractions and plumbagin were tested via broth microdilution techniques on Rhizopus oryzae, Aspergillus flavus, Aspergillus niger, Aspergillus oryzae, Penicillium citrinum. All of the test substances [petroleum ether, chloroform, ethyl acetate, n-butanol fraction and aqueous residue (AR)] except for the AR were active against all the tested strains. The petroleum ether fraction (PEF) was the most active (MIC?=?5.86-6.88?μg/ml, MFC?=?23.44-3.75?μg/ml) of the five tested substances and therefore, was selected for further analysis. Based on antifungal activity, bioactivity-guided fractionation of the PEF led to the isolation of plumbagin. The structure of plumbagin was elucidated by 1H and 13C NMR. Using HPLC, DPVL was found to be a new source of plumbagin. Reversed-phase HPLC was performed using a mobile phase of water and methanol, and peaks were detected at 254?nm. Plumbagin showed a good linear relationship at concentrations ranging from 0.625 to 10?μg/ml. Both the intraday and the interday precision showed that the method was precise, with RSDs of at least 3?% at different concentrations. Recovery rates ranging from 97.86 to 99.94?% were observed, which indicate that the method is accurate. The specificity of the method was established by checking the peak purity of plumbagin. For six independent measurements, the average plumbagin content in DPVL was 11.05?±?0.31?mg/g of dried material. The validated HPLC method provides a new basis for assessing DPVL quality.