The Use of D-Optimal Mixture Design in Optimising Okara Soap Formulation for Stratum Corneum Application

Table 1

Summary of variables for the mixture design.

	Causal factor variables^1,2	Coded level of variables (%)
		Low	High
A	Virgin coconut oil	24.00	28.00
B	Olive oil	15.00	20.00
C	Palm oil	6.00	10.00
D	Castor oil	15.00	20.00
E	Cocoa butter	6.00	10.00
F	Okara	2.00	7.00

(1) Total amount of soybean-waste soap formulation was 50 g, composed of virgin coconut oil (A), extra virgin olive oil (B), palm oil (C), castor oil (D), cocoa butter (E), okara (F), and 12.6% of other necessary ingredients, incorporated in the appropriate amounts to make 100% for each formulation.
(2) A + B + C+ D + E + F = 87.4% + 12.6% (other ingredients) = 100%.