Antioxidant Assays. Photochemiluminescence (PCL) Assay.
The PCL assay was performed on a Photochem system (Berlin,
Germany). The PCL method is based on the photoinduced autoxidation
inhibition of luminol by antioxidants mediated from the radical anion
superoxide. Because the superoxide anion is a deleterious byproduct of
oxygen metabolism responsible for the most important damage related
to reperfusion injuries, the values obtained by the PCL method directly
relate to health properties of a given food ingredient.6 Complete reagent
kits were purchased from the manufacturer. For lipid-soluble substances,
the assay was a mixture of 2.3 mL of reagent 1 (sample solvent), 0.2 mL
of reagent 2 (reaction buffer), and 25 μL of diluted reagent 3 (luminol)
and reagent 4 (Trolox) for the calibration curve. To measure the
antioxidant activity of a sample, reagent 4 was simply replaced by a
sample solution. In this system, luminol is used as a photosensitizer,
which generates superoxide radicals and a chemiluminogenic probe for
free radicals.33 The antioxidant activities are quantified based on their
inhibitory effect on luminescence generation and are expressed as
micromoles of Trolox equivalent per gram of DW tomato. Sample
solutions were diluted 10 times in order for the readings to fit to the
range of the standard curve.
Antioxidant Assays. Photochemiluminescence (PCL) Assay.
The PCL assay was performed on a Photochem system (Berlin,
Germany). The PCL method is based on the photoinduced autoxidation
inhibition of luminol by antioxidants mediated from the radical anion
superoxide. Because the superoxide anion is a deleterious byproduct of
oxygen metabolism responsible for the most important damage related
to reperfusion injuries, the values obtained by the PCL method directly
relate to health properties of a given food ingredient.6 Complete reagent
kits were purchased from the manufacturer. For lipid-soluble substances,
the assay was a mixture of 2.3 mL of reagent 1 (sample solvent), 0.2 mL
of reagent 2 (reaction buffer), and 25 μL of diluted reagent 3 (luminol)
and reagent 4 (Trolox) for the calibration curve. To measure the
antioxidant activity of a sample, reagent 4 was simply replaced by a
sample solution. In this system, luminol is used as a photosensitizer,
which generates superoxide radicals and a chemiluminogenic probe for
free radicals.33 The antioxidant activities are quantified based on their
inhibitory effect on luminescence generation and are expressed as
micromoles of Trolox equivalent per gram of DW tomato. Sample
solutions were diluted 10 times in order for the readings to fit to the
range of the standard curve.
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