Physico-Chemical Properties of Personal Care Products Containing Guava Scrub Granules as Exfoliating Agent

Treated guava scrub granules (GSG) as an exfoliating agent were obtained from the decanter waste at Sime Darby Food and Beverages, Sungai Wangi, Perak (SDFB). The treated GSG and tocotrienol were the main active ingredients incorporated in a basic formulation containing 87 % palm-based derivatives. Guava body scrub (GBS) and guava facial scrub (GFS) lotions were developed at skin pH 5.5 and pH 5.6 respectively. Both products were found to be stable for three years due to the liquid crystalline structure in the emulsion system , having small particle size (490 nm and 880 nm) and high zeta potential values (-54 mv and -39 mv). The rheological properties showed that the GBS lotion had a viscosity at 900 Pas and a yield value at 98 Pa, whereas the GFS lotion 60 Pas and 6 Pa viscosity and yield values respectively. The formulations were designed to be soft and flowable, with the firmness force indicated at 111 g and 66 g for GBS lotion and GFS lotion respectively. Efficacy testing on 20 healthy subjects showed a significant decrease of 21 % and 22 % in skin sebum removal for GBS lotion and GFS lotion respectively. (author)