Optimal extraction solvents use for extraction of Thunbergia laurifolia Linn. leaves and its mode of action on weed control
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Abstract
Thunbergia laurifolia Lindl. leaves were extracted by various ratios (0, 25, 50, 75 and 100%) of ethanol in water as solvents for crude extraction. The highest crude extract yield was obtained by using 25% ethanol solvent with three time extractions. The inhibitory effect of each extract on seed germination and seedling growth of Amaranthus gracilis was investigated. The results indicated that the 100% ethanol extract expressed the best inhibitory effect. At concentration of 1250 ppm, the 100% ethanol extract completely inhibited seed germination of A. gracilis. The 100% ethanol extract also inhibited α-amylase activities in A. gracilis seed during seed germination. However, the extract does not show effect on seed imbibition. The inhibition of induction of α-amylase increased with increasing concentration of the 100% ethanol extract.
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