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DPPH has two major applications, both in laboratory research: one is a monitor of chemical reactions involving radicals, most notably it is a common antioxidant assay, [1] and another is a standard of the position and intensity of electron paramagnetic resonance signals.
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Most commonly, antioxidant capacity is measured using the ABTS Decolorization Assay. Other antioxidant capacity assays which use Trolox as a standard include the diphenylpicrylhydrazyl ( DPPH ), oxygen radical absorbance capacity ( ORAC ) and ferric reducing ability of plasma ( FRAP ) assays.
The following other wikis use this file: Usage on azb.wikipedia.org دیپیپیاچ; Usage on de.wikipedia.org Diphenylpikrylhydrazyl
Absolute concentrations of total phenols in plant tissues differ widely depending on the literature source, type of polyphenols and assay; they are in the range of 1–25% total natural phenols and polyphenols, calculated with reference to the dry green leaf mass. [35] Polyphenols are also found in animals.
Ferric reducing ability of plasma (FRAP, also Ferric ion reducing antioxidant power) is an antioxidant capacity assay that uses Trolox as a standard. [1] The FRAP assay was first performed by Iris Benzie and J. J. Strain of the Human Nutrition Research Group at the University of Ulster, Coleraine.
3,5-Dimethylpiperidines are chemical compounds with the formula C 5 H 8 (CH 3) 2 NH. Two diastereomers exist: the achiral R,S isomer and the chiral R,R/S,S enantiomeric pair. 3,5-Dimethylpiperidine is a precursor to tibric acid.
The most commonly used test is called a TBARS Assay (thiobarbituric acid reactive substances assay). Thiobarbituric acid reacts with malondialdehyde to yield a fluorescent product. However, there are other sources of malondialdehyde, so this test is not completely specific for lipid peroxidation. [14]