Methodology
Sample preparation
Dragon fruit peel waste were obtained from Fah Thai market, Muang District, Chiang Rai. The peels were weighed and washed with tapping water and then air dried. The peels were then cut into 2 cm square and dried by a hot oven flow at 55°C. The sheet of peels were ground at twice then filter the powder to small with Hammer mill at 250 μm sieving. The peel powder was stored at -20 °C until used
Extraction of cosmetic bioactivity from dragon fruit peels
The cosmetic bioactive from dragon fruit peels was extracted by using 4 different solvent; DI water, 50% ethanol in water, 95% ethanol in water, 50% propylene glycol (PG) in water and100% PG. Ratio of ground sample to sample to solvent was 1:10 (w/v). The mixtures were subjected to microwave oven for assistance the extraction of cosmetic bioactive compounds. The microwave was carried out at 810 watt for 30 min. The extracts were obtained by filtration the mixture through a Whatman No.1 filter paper using aspirator pump.
Extraction of antioxidant from betel nut and ginger
Antioxidant from betel nut and ginger were extracted by using 95% ethanol. Ratio of ground sample and ethanol was 1:2 (w/v). The microwave was carried out at 810 watt for 30 min. The extracts were obtained by filtration the mixture through a Whatman No.1 filter paper using aspirator pump. The betel nut or ginger extract was used to include in dragon fruit peel extract for study of stability enhancement.
Absorption scanning of dragon fruit peel extract
The absorption spectra scanning between 400 – 700 nm of dragon fruit peel extract from various solvents were determined by using UV-Vis Spectrophotometer