Autotoxic compounds from fresh alfalfa leaf extracts: Identification and biological activity

被引:48
作者
Chung, IM [1 ]
Seigler, D
Miller, DA
Kyung, SH
机构
[1] Konkuk Univ, Dept Crop Sci, Seoul 143701, South Korea
[2] Univ Illinois, Dept Plant Biol, Urbana, IL 61801 USA
[3] Univ Illinois, Dept Crop Sci, Urbana, IL 61801 USA
[4] Konkuk Univ, Dept Appl Biol & Chem, Seoul 143701, South Korea
关键词
alfalfa extract; autotoxicity; bioassay; chlorogenic acid; salicylic acid; HPLC; GC-MS;
D O I
10.1023/A:1005466200919
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Many investigators have attempted to identify the allelochemicals in alfalfa (Medicago sativa), that cause autotoxicity. The autotoxic compounds from fresh alfalfa leaves were separated and quantified, and their biological activity was determined. Chemical separation procedures involved an 80% methanol extract of fresh alfalfa leaves, treatment with activated charcoal, microcrystalline cellulose thin-layer chromatography (MCTLC), and finally separation by Sephadex LH-20 column chromatography. The various fractions were examined further by high-performance liquid chromatography (HPLC). Preliminary identification by HPLC analysis resulted in peaks with retention times close to those of chlorogenic (m/z = 354) and salicylic acid (m/z = 138) standards, and these compounds were confirmed with CC-MS. Several other peaks remain unidentified. Chlorogenic acid occurs in relatively large amounts (0.39 mg/g) in alfalfa aqueous extracts as compared to salicylic acid (0.03 mg/g), and bioassays suggest that chlorogenic acid is involved in alfalfa autotoxicity.
引用
收藏
页码:315 / 327
页数:13
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