3.5. Determination of antioxidant activity
3.5.1. DPPH radical scavenging activity
The DPPH radical is stable and is widely used to evaluate the
radical scavenging activity of antioxidant compounds. The ability
to act as donor of hydrogen atoms in the transformation of the
DPPH radical to its reduced form was investigated for different
parts of the gac fruit extract. The amount of gac fruit required to
scavenging 50% of DPPH, IC50 are summarised in Table 4. The results
show that the antioxidant capacity of all the extracts decreased
during maturation of the gac fruit (Table 4). The IC50 by
fractions followed the order: green < yellow < red for peel and
pulp. The IC50 value varied from 2.56 to 6.96 mg/g of peel and
2.35 to 5.43 mg/g of pulp fractions. The corresponding value for
the aril fraction was 3.66 mg/g, whilst seed had the highest IC50 value
(range: 4.20–6.66 mg/g). It was observed that pulp (green) having
low IC50 was a very potent radical scavenger. In the DPPH assay,
the lower the IC50 the better it is able to scavenge the radicals and
thereby break the free radical chain reaction (Lim, Lim, & Tee,
2007)
3.5. Determination of antioxidant activity3.5.1. DPPH radical scavenging activityThe DPPH radical is stable and is widely used to evaluate theradical scavenging activity of antioxidant compounds. The abilityto act as donor of hydrogen atoms in the transformation of theDPPH radical to its reduced form was investigated for differentparts of the gac fruit extract. The amount of gac fruit required toscavenging 50% of DPPH, IC50 are summarised in Table 4. The resultsshow that the antioxidant capacity of all the extracts decreasedduring maturation of the gac fruit (Table 4). The IC50 byfractions followed the order: green < yellow < red for peel andpulp. The IC50 value varied from 2.56 to 6.96 mg/g of peel and2.35 to 5.43 mg/g of pulp fractions. The corresponding value forthe aril fraction was 3.66 mg/g, whilst seed had the highest IC50 value(range: 4.20–6.66 mg/g). It was observed that pulp (green) havinglow IC50 was a very potent radical scavenger. In the DPPH assay,the lower the IC50 the better it is able to scavenge the radicals andthereby break the free radical chain reaction (Lim, Lim, & Tee,2007)
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