Chemicals and Reagents. Red dragon fruit Hylocereus polyrhizus was
2.3. Total Flavonoids Content. Total flavonoid content determined by means of
chelation AlCl . A total of . mL fractions RDFP‐AcOEt added with . mL of distilled water and . ml of NaNO . The solution was incubated for minutes at room temperature and then added with . mL of AlCl , after minutes and then added . mL NaO mM . Furthermore, the absorbance was measured at a wavelength of nm using a UV‐Vis spectrophotometer with replication is done times Saini et al., . The quercetin concentrations of , 8 , , and µgmL were tested as above procedure. The linear regression equation of quercetin was made of the relationship between the concentration and the absorbance value of quercetin. The regression equation used to calculate the levels of flavonoids in the sample.2.4. Total Phenolic Content. Total phenolic content was tested using the Folin‐
Ciocalteu reagent, where about mL RDFP‐AcOEt fractions added by . mL of distilled water and mL of Folin‐Ciocalteu reagent, mixed until homogeneous. The solution is shaken out for minutes. Furthermore, added mL of Na CO solution to form alkaline and homogenized by vortex Talapessi et al, . The solution was allowed to stand at room temperature for hours. Absorbance was observed at a wavelength of nm using a UV‐Vis spectrophotometer with replication is done times. Gallic acid concentrations of , , , , and µgmL were tested as above procedure. The Gallic acid linear regression equation was made of the relationship between the concentration and the absorbance value of gallic acid. The regression equation used to calculate the total phenol content.2.5. The Test of Antioxidant Potential with DPPH Method. The fraction of RDFP‐
AcOEt levels , , , and mgmL each mixed with mL of DPP , ‐diphenyl‐ ‐picrylhydrazyl . mM dissolved in a solution of ethanol to ml. The solution was allowed to stand to react at an ambient temperature in the dark for minutes. The Absorbance of each solution is read at a wavelength of 8 nm using a UV‐Vis spectrophotometer Sumarny et al, . The replication carried out two times with each of its absorbances was measured times. The percent of nhibition is calculated using the following formula: inhibition Absorbance of control Absorbance of sample Absorbance of control x The linear regression was made of the relationship between concentration and inhibition. The regression used to calculate the C value. Quercetin concentration of , , , , and µgmL were tested as the procedure above to be used as the comparator.2.6. The determination of the Maximum Absorption Wavelength and the SPF
value. To define the maximum absorption wavelength λ‐max , a viscous RDFP‐ AcOEt fraction dissolved in absolute ethanol in order to obtain series of levels , , and mgL. Furthermore, the scanning by UV‐Vis spectrophotometer at wavelengths between ‐ nm with the intervals of nm, by using ethanol as blank Junior et al, . The maximum wavelength obtained subsequently adjusted for the value of EE x , which has been determined by Sayre et al. Table . SPF value is calculated using a formula that has been developed by Mansur et al. 8 : Table 1. Wavelength and EE λ x λ value Junior et al, Wavelength nm EE x I 290 0.0150 295 0.0817Parts
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