Cosmetic Pore Packs from Deproteinized Natural Rubber Latex

Abstract

Natural rubber latex (NRL) from Hevea brasiliensis consists of cis-1,4-polyisoprene that have many excellent physical properties such as high elasticity, tensile strength, and easily film-forming. However, some proteins in NRL can cause allergy. Hence, this research aimed to prepare cosmetic pore packs from deproteinized NRL (DNRL) that was prepared in-house by enzyme treatment and centrifugation processes. The properties of DNRL were evaluated in terms of amount of remained protein, pH, particle size, polydispersity index, and zeta potential. This DNRL was then formulated the pore pack products by mixing with the other ingredients and casting to the film form. An appropriate pore pack formulation composed of sodium alginate and polyvinylpyrrolidone K30 mixed with DNRL to produce films with good properties. Hydroxypropylmethylcellulose was also added to another formulation for improving toughness of the films. Both products had similar appearance and physical properties such as thickness, uniformity of weight, pH, tensile strength, and elongation at break, but lower peel strength comparing with the commercial pore pack product. These films showed good flexibility, softness, and toughness. After storage at room temperature for a month, there were no different in appearance and pH that presented good stability. The obtained pore packs also exhibited desirable characteristics with acceptable volunteer satisfactions. However, they should be improved for more adhesiveness in further study. In conclusion, DNRL could be used as major component for cosmetic pore pack preparations.