The RSA for pink guava extract at different concentrations are shown in Table 3. As anticipated,the higher the concentration of sample, the higher the scavenging activity. However, at certain concentrations, there was no increase in the scavenging activity. At higher concentrations of any antioxidant,absorbance will not increase beyond the point at which all the available DPPH free radicals have been consumed. This is reflected in the results,which showed no change in DPPH radical scavenging activity at concentrations above 40 mg fresh sample/1 ml solvent. At high sample concentration,the RSA rank of the antioxidant activity value in the extracted samples was: semenyih skin = sungkai skin = semenyih fruit = semenyih flesh > sungkai fruit > sungkai flesh. Generally, any sample showed scavenging activity value higher than 80% should be diluted to get better and safer classification of
samples. When samples classified by using samples at low concentration (10 mg/ml) of extract; the rank of the antioxidant activity value in the extracted samples was: semenyih skin > sungkai skin > semenyih fruit > semenyih flesh > sungkai fruit = sungkai flesh
The RSA for pink guava extract at different concentrations are shown in Table 3. As anticipated,the higher the concentration of sample, the higher the scavenging activity. However, at certain concentrations, there was no increase in the scavenging activity. At higher concentrations of any antioxidant,absorbance will not increase beyond the point at which all the available DPPH free radicals have been consumed. This is reflected in the results,which showed no change in DPPH radical scavenging activity at concentrations above 40 mg fresh sample/1 ml solvent. At high sample concentration,the RSA rank of the antioxidant activity value in the extracted samples was: semenyih skin = sungkai skin = semenyih fruit = semenyih flesh > sungkai fruit > sungkai flesh. Generally, any sample showed scavenging activity value higher than 80% should be diluted to get better and safer classification ofsamples. When samples classified by using samples at low concentration (10 mg/ml) of extract; the rank of the antioxidant activity value in the extracted samples was: semenyih skin > sungkai skin > semenyih fruit > semenyih flesh > sungkai fruit = sungkai flesh
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