Abstract
Objective: Thai organic Riceberry rice, deep purple rice, has been known to have the wide variety of nutritional benefits. However, broken rice whichaccounted for 20-30% of the yield, was sold at a very low price. This study aimed to optimize the extracting procedure and evaluate the biologicalactivities of Thai organic Riceberry broken rice extracts for anti-aging cosmetology as well as to investigate the stability profile of the extract.Methods: The extracting procedure, of which deionized water served as a solvent, was varied by spray-drying temperature (150 and 170°C)and pH value (2.0 and 5.5). Antioxidant effects of the obtained extracts were evaluated through 2,2-Diphenyl-1-picrylhydrazyl, 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid, linoleic acid peroxidation, and ferric reducing antioxidant power assays. Furthermore, the anti-tyrosinaseeffect was studied through the L-tyrosine pathway. The total phenolic content (TPC) of each extract was evaluated by Folin–ciocalteu’s method. Theextract, presenting the greatest activity, was then selected for investigating its stability under various storage conditions.Results: Four Riceberry rice extracts presented noticeable antioxidant and anti-tyrosinase effect. The extract, derived from a spray-drying temperatureof 150°C and a pH value of 2.0, exhibited the highest effects with the highest TPC (27.08 ± 0.67 mg Gallic acid/g extract). This extract also presented agood stability profile. However, this extract should be stored in a high-temperature condition (45°C) to prevent degradation.Conclusion: The aqueous extracts of Thai organic Riceberry broken rice could be a promising agent for further developing into anti-aging cosmetology.
Highlights
Aging society is currently considered as one of the most important world megatrends, which highly contributes to the huge market demand for anti-aging products [1]
This waste product might be a promising antioxidant source, offering an alternative natural substance for anti-aging cosmetics, which can value-add to agricultural waste
Settapramote et al denoted whether the difference in the agricultural area had a significant effect on polyphenol and anthocyanin contents of Thai Riceberry rice extracts and the rice, grown in Lampang Province, contained the highest number of beneficial chemical constituents [7]
Summary
Aging society is currently considered as one of the most important world megatrends, which highly contributes to the huge market demand for anti-aging products [1]. After the rice polishing procedure, broken rice, which accounted for 20–30% of the yield, was sold at a very low price [5]. This waste product might be a promising antioxidant source, offering an alternative natural substance for anti-aging cosmetics, which can value-add to agricultural waste. Settapramote et al denoted whether the difference in the agricultural area had a significant effect on polyphenol and anthocyanin contents of Thai Riceberry rice extracts and the rice, grown in Lampang Province, contained the highest number of beneficial chemical constituents [7]. Thai organic Riceberry broken rice, Lampang cultivar, was studied to establish its anti-aging property utilizing evaluation of antioxidant and antityrosinase effects.
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