Abstract:
Waste cooking oil is utilized for re-cooking to enhance commercial
efficiency, but its nutritional value has decreased and can cause severe health
problems. The cis forms of fatty acids contained in rice bran oil are converted
into harmful transform after exposure to high temperatures repeatedly. This
study was designed to prepare hard and liquid soap using varying
percentages of used rice bran oil, coconut oil, castor oil, NaOH, glycerin,
sodium silicate, calcium carbonate, EDTA, SLES, dyes, and fragrance. In the
prepared hard soap were found to be the values ranges of TFM of 25.10 to
69.56%, total alkaline content of 2.69 to 1.85%, pH of 11.45 to 8.901,
moisture content of 8.901 to 14.863%, and foamability of 7.50 to 17.5cm.
The formula containing used rice bran oil at 38.8%, Coconut oil at 14.82%,
and Castor oil at 6.50% presented the best results in hard soap. The prepared
liquid soap resulted the values ranges of TFM of 36.03 to 67.99%, Total
alkaline content of 1.33 to 2.18%, pH of 12.57 to 9.25, and foamability of
13.0 to 18.33 cm. The best formula was obtained from liquid soap treatment
containing used rice bran oil of 50.00%, Coconut oil of 11.50%, and castor
oil of 5.00%. The tested results showed that the hard soap can be categorized
into Type 01 soap according to the SLS standards. It can be concluded that
the used rice bran oil can be used as an alternative raw material for soap
manufacturing.
