Although various complex powders have been studied and developed as raw materials for cosmetics in recent years, lately we have gone in a natural direction and turned our attention to starches, which are natural raw materials, and have undertaken the development of new functional complex powders.
The carrier (porous starch) of these compex powders is partially digested by amylase, an amylolytic enzyme on raw corn starch-granules (mean diameter 10μm), and has numerous, small, 1-4μm mutually independent pores on its surface. Using a wet process, we were able to selectively embed solid micrograins whithin the pores of porous starch. In addition, we treated by simlar methods liquid functional substances such as glycerin, vitamin A palmitate, and octyl methoxycinnamate, and evaluated the characteristics of the complex powders obtained. Compared to nonporous starch, porous starch-glycerin complex powders exhibited a two-fold retention capacity in a moisture retention capacity evaluation test using collagen sheets. In addition, in a vitamin A palmitate release test (based on IPA: Water=75: 25v/v), it was evident that the release rate of porous starch-complex powders was more controllable than nonporous starches. Furthermore, complexes of UV absorbents (benzophenone-6 or octyl methoxycinnamate) exhibited the same efficacy as when using nonporous starches. Because some or most of the UV absorbents are embedded in the pores, these porous starch-UV absorbent complex powders could ease the burden of the skin.
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