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.