Total Flavonoids Content. Measurements of the total flavonoid RDFP‐AcOEt
3.3. Total Phenolic Content. Total phenolic content of the RDFP‐AcOEt fraction
done using the Folin‐Ciocalteu method. Gallic Acid Equivalent GAE is a common reference for measuring the amount of phenolic compounds present in a material. Usage of gallic acid was based on the availability of the substance is more stable and pure than the other standards compounds. The relationship between the absorbance values and the concentrations of gallic acid would produce a linear regression equation. Gallic acid linear regression equation obtained was y = , x + . with the value of R² = . 8 Figure . Total phenolic content of the RDFP‐AcOEt fraction x‐axis is calculated by entering the absorbance value of the sample of RDFP‐AcOEt fractions into the y‐axis. The result shows an average of total phenol content of the RDFP‐AcOEt fraction C value was . ± . mg GAEmL. The dilution is not done in this test and the stock solution used was . mg RDFP‐ AcOEt fractions were dissolved in mL ethanol. Therefore, the average of total phenolic content TPC of RDFP‐AcOEt fractions obtained from the calculation was . ± . mg GAE g Table . t means that every grams of RDFP‐ AcOEt fractions equivalent to . mg gallic acid. When compared with the research of Chet , RDFP‐AcOEt fractions showed total phenol content higher than RDFP water extracts with an average of total phenol content of . ± .8 mg GAE g. y = 0.0009 ‐ 0.1414 R² = 0.9904 0. 1 1. 2 00 1000 1 00 2000 2 00 Ab sorbance Concentration μgml 27 Figure 2. Standard curve of Gallic acid Table3. Total Phenolic Content of RDFP‐AcOEt Fraction Replication
Absorbance Phenolic Level in Solution µg GAEmL sample Total Phenolic Content mg GAE100 g sample 1 . . .8 2 . . 8 . 3 . . . Average . . Deviation Standard . .3.4. The Test of Antioxidant Potential with DPPH Method. Antioxidant potential
of phenolic and flavonoids compounds of RDFP‐AcOEt fractions can be determined by performing a test of free radicals DPP scavenging. Quercetin chosen for comparison because of quercetin has a very strong antioxidant activity. f vitamin C has antioxidant activity level is , then the quercetin has antioxidant activity level about . Sugrani et al, . The value of inhibition obtained by calculation done by inputting absorbance values into the formula of inhibition. The concentration of quercetin and RDFP‐AcOEt fractions associated with the value of inhibition would generate a linear regression. Quercetin linear regression obtained was y = , x + 8. by R² = . , whereas the linear regression equation RDFP‐AcOEt fractions was , x + y = . 8 by R² = . Figure . The linear regression equation was used to determine C values x‐axis by inputting a value of in the y‐axis to the linear regression equation obtained. The results showed that the C value of quercetin was . 8 µgmL and the C value of RDFP‐AcOEt fractions was . µgmL. t means that the RDFP‐AcOEt fraction requires concentration of . µgmL for DPP radical capture as much as , while the concentration of quercetin requires only . µgmL to capture as much as DPP radical. The large C or smaller antioxidant power that allegedly caused flavonoid compounds that bind by side groups that can inhibit the activity of antioxidants, so that flavonoids can not donate hydrogen and electrons to the DPP Budilaksono et al, . Additionally, the side groups also can cause methylated flavonoid ‐ into ‐C group , so that the source of protons to capture DPP reduced Mikamo et al, . The presence of other compounds such as proteins and fats in KBNM‐AcOEt fractions allegedly also can interfere with the reaction of free radicals DPP scavenging Budilaksono et al, . Although the C value of the fraction into the weaker level, when seen from the level of y = 0.0105x + 0.0201 R² = 0.9968 0.000 0.100 0.200 0.300 0.400 0.500 0.600 10 20 30 40 50 60 Absorbance Concentration µgmlParts
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