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 concen trations, 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 differentconcentrations are shown in Table 3. As anticipated,the higher the concentration of sample, the higherthe scavenging activity. However, at certain concen trations, there was no increase in the scavengingactivity. At higher concentrations of any antioxidant,absorbance will not increase beyond the pointat which all the available DPPH free radicals havebeen consumed. This is reflected in the results,which showed no change in DPPH radical scavengingactivity at concentrations above 40 mg freshsample/1 ml solvent. At high sample concentration,the RSA rank of the antioxidant activity value in theextracted samples was: semenyih skin = sungkaiskin = semenyih fruit = semenyih flesh > sungkaifruit > sungkai flesh. Generally, any sample showedscavenging activity value higher than 80% shouldbe diluted to get better and safer classification ofsamples. When samples classified by using samplesat low concentration (10 mg/ml) of extract;the rank of the antioxidant activity value in theextracted samples was: semenyih skin > sungkaiskin > semenyih fruit > semenyih flesh > sungkaifruit = sungkai flesh.
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