3.6. In vitro antioxidant activity
DPPH radical scavenging activity has been widely accepted as a
tool for estimating the antioxidant activity of substances in a model
system. The DPPH radical scavenging activities of CPP and APP
increased in a dose-dependent manner as shown in Fig. 5(A). When
the concentrationwas higher than 4.5 mg/mL, the DPPH scavenging
activity of all pectin samples were more than 60% and the IC50 of
CPP and APP were significantly lower than the previous report(Dalonso & Petkowicz, 2012), which indicated that CPP and APP
extracted by subcritical water had higher in-vitro antioxidant activities.
It was interesting that the IC50 of APP and CPP increased
slightly as the extraction temperature increase, which was possibly
due to hydrolysis of pectin reduced proton donation from hydroxyl
and uronyl group of the monosaccharide units, carboxyl group of
galacturonic acid units and acetyl groups (Nara, Yamaguchi, Maeda,
& Koga, 2009). Compared the result of CPP with the APP, it was
indicated that the DPPH scavenging activity of CPP was slightly
stronger than APP.
In order to further verify the antioxidant activities of the APP
and CPP, the ABTS radical scavenging activities of APP and CPP
were also investigated. The results of ABTS radical scavenging
activity were consistent with the DPPH test as shown in the
Fig. 5(B). Both CPP and APP showed higher antioxidant activities
in a dose-dependent manner as it was in DPPH assay. The IC50
values of CPP and APP varied slightly and the highest radical
scavenging activity was 99.65% of A130 and 98.49% of C100
respectively, which indicated that APP and CPP extracted by
subcritical water had higher activity to scavenge radical, such as
DPPH and ABTS.
3.6. In vitro antioxidant activity
DPPH radical scavenging activity has been widely accepted as a
tool for estimating the antioxidant activity of substances in a model
system. The DPPH radical scavenging activities of CPP and APP
increased in a dose-dependent manner as shown in Fig. 5(A). When
the concentrationwas higher than 4.5 mg/mL, the DPPH scavenging
activity of all pectin samples were more than 60% and the IC50 of
CPP and APP were significantly lower than the previous report(Dalonso & Petkowicz, 2012), which indicated that CPP and APP
extracted by subcritical water had higher in-vitro antioxidant activities.
It was interesting that the IC50 of APP and CPP increased
slightly as the extraction temperature increase, which was possibly
due to hydrolysis of pectin reduced proton donation from hydroxyl
and uronyl group of the monosaccharide units, carboxyl group of
galacturonic acid units and acetyl groups (Nara, Yamaguchi, Maeda,
& Koga, 2009). Compared the result of CPP with the APP, it was
indicated that the DPPH scavenging activity of CPP was slightly
stronger than APP.
In order to further verify the antioxidant activities of the APP
and CPP, the ABTS radical scavenging activities of APP and CPP
were also investigated. The results of ABTS radical scavenging
activity were consistent with the DPPH test as shown in the
Fig. 5(B). Both CPP and APP showed higher antioxidant activities
in a dose-dependent manner as it was in DPPH assay. The IC50
values of CPP and APP varied slightly and the highest radical
scavenging activity was 99.65% of A130 and 98.49% of C100
respectively, which indicated that APP and CPP extracted by
subcritical water had higher activity to scavenge radical, such as
DPPH and ABTS.
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