Conclusion
The plant sterol ester derived from rice bran was found to promote the synthesis of hyaluronic acid and reduce the amount of trans-epidermal water loss, suggesting that it improves the skin barrier function. Topical application of RSE is thought to increase the amount of synthesized hyaluronic acid and the water retention body, resulting in the retention of water that has transpired and the enhancement of the barrier function of the skin. It has also been speculated that RSE promotes type III collagen production, repairs skin structure via wound healing mechanisms, and improves wrinkles by normalizing epidermal turnover and enhancing barrier function.
In addition, a decrease in the redness score was observed after applying RSE, suggesting an anti-inflammatory effect. The phytosterols and triterpenes contained in RSE likely suppressed the inflammatory reaction and further improved the moisturizing property by enhancing barrier function, thereby preventing erythema and pore problems caused by inflammation.
In this study, the sterol ester derived from rice bran is expected to improve wrinkles in the skin and dermis structure, whose barrier function has deteriorated due to inflammation, and can be effective as a cosmetic raw material.