In this study, it was found that the roots's chloroform extract (48.66[+ or -]1.23 [micro]g
pyrocatechol eguivalent/mg extract) had higher phenolic contents than the others, while the one containing least phenolics was the stems's chloroform extract (22.68 [+ or -]1.10 [micro]g
pyrocatechol eguivalent/mg extract).
orientalis were determined with the Folin-Ciocalteu reagent using Slinkard and Singleton's method (1977),
pyrocatechol was used as a standard for phenolic compound (18).
We then repeated this process for the remaining suspect candidates with DF [greater than or equal to] 20, and we confirmed an additional two novel EOAs:
Pyrocatechol and 2'-Hydroxyacetophenone (and/or its isomer 3'-Hydroxyacetophenone).
In addition, CGA intervention solely increased 2-ethylhydracrylic acid,
pyrocatechol, and 3-hydroxybenzoic acid, accompanied by decreased 4-deoxyerythronic acid, nicotinamide, asparagine, D-arabitol, fructose, D-mannose, 5-hydroxyindoleacetic acid, and 2-hydroxyglutarate.
Pyrocatechol violet (PV) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) were purchased from TCI (Tokyo, Japan).
Simpson, "Equilibrium modelling of interferences in the visible spectrophotometric determination of aluminium(III): comparison of the chromophores chrome azurolS, eriochrome cyanine R and
pyrocatechol violet, and stability constants for eriochrome cyanine R-aluminium complexes," Analytica Chimica Acta, vol.
Reagents 1,1-diphenyl-2picrylhydrazyl (DPPH), 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), sulphanilamide, N-(1-naphthyl) ethylenediamine dihydrochloride (NED), ethylenediamine tetraacetic acid (EDTA),
pyrocatechol violet, sodium nitrite, aluminium chloride, butylated hydroxytoluene (BHT), and all commercial standards were purchased from Sigma-Aldrich (Germany).
Tg-HbI Phenols [mathematical [K.sup.p.sub.m] expression not reproducible] Guaiacol 0.15 0.54
Pyrocatechol 0.097 7.28 L-DOPA 1.44 1.97 Phenol 1378.55 1.07 Hydroquinone 108.25 1.62 Tg-HbII Phenols [mathematical [K.sup.p.sub.m] expression not reproducible] Guaiacol 0.39 0.40
Pyrocatechol 0.087 0.37 L-DOPA 2.65 1.25 Phenol 4.49 1.81 Hydroquinone 5.77 10.09 Note: Michaelis-Menten constants for phenols.
Polyphenol oxidase (PPO): PPO activity in brinjal leaves was determined by adding 50 u L leaf extracts to 3 mL of a solution comprising 100 mM Potassium Phosphate buffer in specified circumstances (pH 6.5 and 25 mM
pyrocatechol).
For determination of niobium in the steel proposed several methods based on the use of complexes of Nb (V) c tetrazolium salts and poly-phenols (4-nitropirokatehin, 2,3-dihydroxynaph-thalene and
pyrocatechol [9].