4 various phenolic substances such as pyrogallol, pyrocatechol
, 1,2,4-benzenetriol, and catechin, as well as polyphenol rich extracts of tea and coffee, generated significant amounts of [H.
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
Structure activity relationship of phenolic compounds (phenole, pyrocatechol
and hydroquinone) on natural lymphocytotoxicity of cartpCyprinuscarpio.
graecum tubers and leaves were determined as pyrocatechol
However, Kozlov (1964) used pyrocatechol
instead of pyrogallol for peroxidase assay.
Such chemicals include hydroxychavicol, chavibetol, piperbetol, arecoline, carvacrol, caryophyllene, piperitol, eugenol, isoeugenol, allyl pyrocatechol
, chavicol, safrole, anethole, betasitosterol, beta-sitosteryl palmitate, dotriacontanoic acid, tritriacontane, piperine, piperlonguminine, chavibetol acetate, estragole, piperols A and B, and pyrocatechol
diacetate (Zeng et al.
(plant pigment), which occurs in the epidermis and the head of beets (in amounts of about 0.
Table 1: PPD Makes Many Hair Shades Possible Compound Brown Red Blonde Blue-Grays p-aminophenol x x x o-aminophenol x x x 2-nitro-ppd x x 4-nitro-ppd x x x m-phenyldiamine x x x pyrocatechol
x x resorcinol x x x p-tolylenediamine x x x pyrogallol x x x x
1991), which was determined by a short-term colourimetric assay using pyrocatechol
violet (Kerven et al.
4-dibutylphenol, 24-243 mg/l pyrocatechol
were mentioned .
We measured TUP by the benzethonium chloride and biuret method with the Hitachi 917 analyzer and by the modified biuret and pyrocatechol
violet dry-chemistry method with the Vitros 250 analyzer (Johnson & Johnson).
Allergic contact dermatitis has been reported and four allergenic compounds have been characterized as pyrocatechol
derivatives, but not fully identified, from different extracts of this plant and from L.