DPPH is reduced to hydrazine when it
reacts with hydrogen donors. Briefly, serial dilutions (10, 1,
0.1, 0.01, 0.001 mg/ml) of samples (aqueous and methanol
extracts) were tested for radical scavenging activity. 0.2 mM
DPPH was prepared in methanol and 500 ll of this solution
was added to 1000 ll of a sample at different concentrations.
The samples were incubated in the dark at room temperature
for 30 min. After that, the absorbance was measured at
517 nm using a spectrophotometer. The percentage of radical
scavenging activity (RSA%) was calculated using the following
equation:
RSA% ¼ ½ðA0 A1=A0 100
in which A0 is the absorbance of the control reaction, and
A1 is the absorbance in the presence of the sample. In addition,
the inhibitory concentration that reduces 50% of free radicals
(IC50) was determined. The experiments were repeated three
times.
DPPH is reduced to hydrazine when it
reacts with hydrogen donors. Briefly, serial dilutions (10, 1,
0.1, 0.01, 0.001 mg/ml) of samples (aqueous and methanol
extracts) were tested for radical scavenging activity. 0.2 mM
DPPH was prepared in methanol and 500 ll of this solution
was added to 1000 ll of a sample at different concentrations.
The samples were incubated in the dark at room temperature
for 30 min. After that, the absorbance was measured at
517 nm using a spectrophotometer. The percentage of radical
scavenging activity (RSA%) was calculated using the following
equation:
RSA% ¼ ½ðA0 A1=A0 100
in which A0 is the absorbance of the control reaction, and
A1 is the absorbance in the presence of the sample. In addition,
the inhibitory concentration that reduces 50% of free radicals
(IC50) was determined. The experiments were repeated three
times.
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