Pericarp of Sapindus mukorossi Gaertn has been used as a natural detergent and its extract is commercially utilized as a foam-stabilizing and emulsifying agent. The goal of this study is to investigate the foam properties, detergent ability and long-term preservative efficacy of the saponins from the pericarp of S. mukorossi Gaertn. The crude saponin content in the pericarp of S. mukorossi Gaertn was 14.2% and the total saponins content in the crude saponins extract was 85% (w/w). The foaming power of the 0.5% crude saponins extract solution from S. mukorossi Gaertn is 65% of 0.5% SLS solution and similar to that of 0.5% Tween 80 solution. The R5 value of 91.7% represented good foam stability of the crude saponins extracted from the pericarp of the plant. With the reduction of water surface tension from 72 mN/m to 51.7 mN/m, the 0.5% crude saponins extract solution has wetting ability. The sebum-removed experiment indicated that the crude saponins extract has moderate detergency. The results of the long-term preservative efficacy test revealed that the 0.5% crude saponins extract from the pericarp of S. mukorossi Gaertn is an effec-tive preservative against Staphylococcus aureus ATCC 6538, but inefficacious against Escherichia coli ATCC 8739 and Aspergillus niger ATCC 16404.
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