Total antioxidant activity. ABTS+ radical scavenging activity:
2 mM of ABTS+ (2.2-azino-bis (3-ethyl benzothiazoline-6-sulfonic
acid) diammonium salt) and 2.45 mM of K2S2O8 solution were prepared
in 0.1 M of PO4
−3 buffer solution (pH 7.4). The ABTS + and
K2S2O8 solutions were mixed in (1:2) ABTS–K2S2O8 and incubated
for 6 h in the dark. The absorbance of the mixture was read at
734 nm and it was diluted with PO4
−3 buffer ifthe value was greater
than 0.75. Finally, 20 L samples were taken out ofthe mixture into
tubes, 1 mL of ABTS+–K2S2O8 solution was added to each and buffer
solution was added to make the total sample volume 4 mL. Following
vortexing, they were incubated for 30 min and absorbances
were read at 734 nm. The results were expressed as mol Trolox
equivalent (TE)/g flesh weight.
Ferric ions (Fe+3) reducing antioxidant power assay (FRAP): portions
of 120 L were taken from the samples, 0.2 M of phosphate
buffer (PO4
−3)(pH 6.6) was added to obtain a volume of 1.25 mL and
then1.25 mL of 1%potassiumferricyanide (K3Fe(CN)6) solution was
added. After vortexing, they were incubated at 50 ◦C. Afterwards,
1.25 mL of 10% TCA and 0.25 mL of 0.1% FeCl3 were added to the
samples. The absorbances of the resulting solution were read on
an UV–vis spectrometer at 700 nm. The results were expressed as
mol TE/g flesh weight.
2
Total antioxidant activity. ABTS+ radical scavenging activity:2 mM of ABTS+ (2.2-azino-bis (3-ethyl benzothiazoline-6-sulfonicacid) diammonium salt) and 2.45 mM of K2S2O8 solution were preparedin 0.1 M of PO4−3 buffer solution (pH 7.4). The ABTS + andK2S2O8 solutions were mixed in (1:2) ABTS–K2S2O8 and incubatedfor 6 h in the dark. The absorbance of the mixture was read at734 nm and it was diluted with PO4−3 buffer ifthe value was greaterthan 0.75. Finally, 20 L samples were taken out ofthe mixture intotubes, 1 mL of ABTS+–K2S2O8 solution was added to each and buffersolution was added to make the total sample volume 4 mL. Followingvortexing, they were incubated for 30 min and absorbanceswere read at 734 nm. The results were expressed as mol Troloxequivalent (TE)/g flesh weight.Ferric ions (Fe+3) reducing antioxidant power assay (FRAP): portionsof 120 L were taken from the samples, 0.2 M of phosphatebuffer (PO4−3)(pH 6.6) was added to obtain a volume of 1.25 mL andthen1.25 mL of 1%potassiumferricyanide (K3Fe(CN)6) solution wasadded. After vortexing, they were incubated at 50 ◦C. Afterwards,1.25 mL of 10% TCA and 0.25 mL of 0.1% FeCl3 were added to thesamples. The absorbances of the resulting solution were read onan UV–vis spectrometer at 700 nm. The results were expressed asmol TE/g flesh weight.2
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