Abstract: Asparagus peel contains a lot of special constituents besides the nutritional components, and belongs to the high nutritional and pharmaceutical type of material. The antimicrobial activities of water extracts and ethanol extracts of Asparagus peel against the most common air contaminative microorganisms were determined with the experimentation method of dull colony notation. The results showed that there are antibacterial genes in the Asparagus peel, then the minimal inhibitory volume score of water extracts and ethanol extracts of Asparagus peel and the effects of pH value and heating were all determined. At the same time the relationship between inhibitory activity and time and the capability of inhibitory of water extracts and ethanol extracts of Asparagus peel were argued by means of spectrophotometric. The results showed that both two types of extractss have evidently antibacteriostatic effect, but ethanol extracts show stronger inhibitory activity than water extracts especially in acid condition. The inhibitor has also good stability and inhibitory effects with heat treatment(121 ℃, 15 min), even though there is a little weakened. After 12 hours the antimicrobial activities of water extracts and ethanol extracts of Asparagus peel reach the peak, then weaken gradually.

Key words: Asparagus skin, antimicrobial characteristics, dull colony notation, ethanolic extracts, water extracts