Abstract
Gadung (Dioscorea hispida Dennst) tuber contains dioscorin, an alkaloid with high angiotensin converting enzyme-inhibitory capacity. In this research, dioscorin was extracted using microwave assisted extraction (MAE). The objectives of this research were to investigate the influence of ethanol concentration (75% to 96% w/w), solvent-material ratio (10: 1 to 20: 1) and microwave power (100W to 400W) on the extraction yield, and to develop a mathematic model to represent that process. The optimum condition for this process was extraction using 85% aqueous ethanol at solvent-material ratio of 12.5: 1, and microwave power of 100W for 20min. The mathematic model agreed well with the experimental data with average error of 2.96%.
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