Abstract:
UVA irradiation could induce oxidative stress, leading to accumulation of free radical and subsequently skin damaged and cancer development. Thus, antioxidant compound would be feasible to use as pharmaceutical additive in the product for skin protection from sun light. The present work was aimed to verify the agricultural waste of rice bran i.e., Hom Dang and Kam Doi Saked as antioxidant materials. It was observed that Hom Dang had a higher antioxidant activity than Kam Doi Saked, based on DPPH, ABTS and FRAP assay. Additionally, Hom Dang extract could revive viability of 12 J/cm2 UVA treated cells, better than Kam Doi Saked. However, at the higher dose of UVA treatment at 20 J/cm2, both rice bran extracts stimulated more apoptotic cells. The additional of Hom Dang prior to, and after UVA exposure induce more apoptosis than the control UVA treated cell. However, Kam Doi Saked could induce apoptosis only when apply before the UVA treatment. Besides, Hom Dang extract reduced the percentage of micronuclei in UVA treated cells. Testing on the light absorption of rice bran extracts revealed photosensitizer property which resulted in induction of intracellular ROS. Thus, these characteristics of rice bran extract could play major role in preventing and reducing the risk of skin cancer. Consequently, Hom Dang rice bran extract is a remarkable choice of antioxidant source to apply as a cosmetic ingredient for it regenerating healthy cells, and reducing the risk of skin cancer from UVA rays better than Kam Doi Saked.