Abstract
This study was purposed to extract and evaluate stability of cosmetic bioactive compounds from dragon fruit (Hylocereus undatus) peels. Five solvents including DI water, 50% ethanol, 95% ethanol, 50% propylene glycol (PG) and PG were compared in extraction efficacy. Microwave at 810 Watt was used to assist the extraction potential. Extractable phenolic content (EPC) assayed by Folin-Ciocalteu method and antioxidant capacity assayed by DPPH radical scavenging and ferric reducing antioxidant power (FRAP) assays were employed for comparative evaluation. The 50% PG extract showed the highest EPC and FRAP of 6.95 mg gallic acid equivalent per gram sample (GAE/g) and 363 mg trolox equivalent antioxidant capacity per gram sample (TEAC/g), respectively, whereas the 95% ethanolic extract provided the greatest DPPH scavenging capacity of 656.52 mg TEAC/g. Inclusion of 5% betel nut extract or 5% ginger extract did not affect color stability, while the latter increase the pH of the dragon fruit extract. Addition of betel nut and ginger extract to the dragon fruit extract were able to retain the EPC and antioxidant loss during storage. The former exhibited superior efficacy to the latter. Result of this study illustrated that the dragon fruit peel could be used as a source for cosmetic bioactive extraction due to it providing weather antioxidant and colorant capacity. Other plant source possessing high antioxidant activity was able to prolong the dragon fruit peel extract.
AbstractThis study was purposed to extract and evaluate stability of cosmetic bioactive compounds from dragon fruit (Hylocereus undatus) peels. Five solvents including DI water, 50% ethanol, 95% ethanol, 50% propylene glycol (PG) and PG were compared in extraction efficacy. Microwave at 810 Watt was used to assist the extraction potential. Extractable phenolic content (EPC) assayed by Folin-Ciocalteu method and antioxidant capacity assayed by DPPH radical scavenging and ferric reducing antioxidant power (FRAP) assays were employed for comparative evaluation. The 50% PG extract showed the highest EPC and FRAP of 6.95 mg gallic acid equivalent per gram sample (GAE/g) and 363 mg trolox equivalent antioxidant capacity per gram sample (TEAC/g), respectively, whereas the 95% ethanolic extract provided the greatest DPPH scavenging capacity of 656.52 mg TEAC/g. Inclusion of 5% betel nut extract or 5% ginger extract did not affect color stability, while the latter increase the pH of the dragon fruit extract. Addition of betel nut and ginger extract to the dragon fruit extract were able to retain the EPC and antioxidant loss during storage. The former exhibited superior efficacy to the latter. Result of this study illustrated that the dragon fruit peel could be used as a source for cosmetic bioactive extraction due to it providing weather antioxidant and colorant capacity. Other plant source possessing high antioxidant activity was able to prolong the dragon fruit peel extract.
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