Okara, soybean waste from tofu and soymilk production, was utilised as a natural antioxidant in soap formulation for stratum\ncorneum application. D-optimal mixture design was employed to investigate the influence of the main compositions of okara soap\ncontaining different fatty acid and oils (virgin coconut oilA(24ââ?¬â??28% w/w), olive oil B (15ââ?¬â??20% w/w), palm oilC(6ââ?¬â??10% w/w), castor\noil D (15ââ?¬â??20% w/w), cocoa butter E (6ââ?¬â??10% w/w), and okara F (2ââ?¬â??7% w/w)) by saponification process on the response hardness of\nthe soap. The experimental data were utilized to carry out analysis of variance (ANOVA) and to develop a polynomial regression\nmodel for okara soap hardness in terms of the six design factors considered in this study. Results revealed that the best mixture\nwas the formulation that included 26.537% A, 19.999% B, 9.998% C, 16.241% D, 7.633% E, and 7.000% F.The results proved that the\ndifference in the level of fatty acid and oils in the formulation significantly affects the hardness of soap. Depending on the desirable\nlevel of those six variables, creation of okara based soap with desirable properties better than those of commercial ones is possible.
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