A low molecular weight protein from coconut (Cocos nucifera L.) milk was extracted using phosphate buffer solution pH 7.6, ammonium sulfate precipitation, and dialysis. The insoluble fraction had higher protein concentration (22.39 μg/mL) than the soluble fraction (9.95 μg/mL) and the electrophoretic profile on SDS-PAGE also showed that the low molecular weight proteins were concentrated in the insoluble fraction. The fraction containing the low molecular weight proteins were purified using DEAE-Cellulose ion-exchange chromatography followed by gel filtration chromatography using Sephadex G-75. The isolated protein has an estimated molecular weight of 19kDa using the electrophoretic mobility on SDS-PAGE and on the elution parameter by gel filtration chromatography. The low molecular weight protein showed antimicrobial properties against food spoilage yeasts, Debaryomyces hansenii and Candida albicans. [ABSTRACT FROM AUTHOR]