catechol


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Related to catechol: Catechol oxidase

catechol

[′kad·ə‚kȯl]
(organic chemistry)
One of a group of three isomeric dihydroxy benzenes in which the two hydroxyl groups are ortho to each other. Also known as catechin; pyrocatechol; pyrocatechuic acid.
References in periodicals archive ?
Tyrosinases (sometimes referred to as polyphenol oxidases, monophenol monoxygenases, catechol oxidases, cre-solases, or catecholases) are well known for their role in producing melanin in vertebrates.
The first step in aniline conversion to catechol is a multistep reaction catalyzed by three enzymes, a glutamine synthetase (GS)-like enzyme, aniline dioxygenases and glutamine amidotransferase like enzyme (Liang et al., 2005; Murakami et al., 1998).
Catechol (CT), hydroquinone (HQ), and KCl were purchased from Sigma-Aldrich, and graphite (G) (>99%) was purchase from Fluka.
First, commercially available 3,4-dihydroxybenzaldehyde was converted to the corresponding catechol aldehyde (2) by reacting it with compound 1.
Laccase from Trametes versicolor (EC 1.10.3.2), with an activity of 13.6 U/mg, was obtained from Sigma; sodium acetate trihydrate was from JT Baker; acetic acid glacial was from Laboratorios Lutz, Mexico, 60.05%; caffeic acid, gallic acid, and catechol were from Fluka; ethanol was from Sigma-Aldrich (HPLC degree); Hg[(N[O.sub.3]).sub.2] was from Sigma-Aldrich; and deionized water was from a MilliQ Millipore equipment.
Catechol (Sigma-Aldrich, Germany) as substrate in concentrations of 0.0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11 and 0.120M was prepared, and 3ml of each concentration was placed into a quartz cell along with 75[micro]l of each inhibitor or their combinations.
The researchers applied polyphenol coatings to the surface of chitosan-grafted polypropylene by using the laccase-assisted oxidative polymerization of catechol and catechin.
For it, 0.5 mL phosphate buffer (0.1 M, PH7) was added to 200 uL enzyme solution and 200 uL catechol solution (2%).
Alternatively, reactive oxygen species (ROS) generated from redox cycling of both stilbene and catechol estrogens can act as signaling messengers also that are also involved in cell growth [7, 12, 13].
The chemical features were combined as follows: catechol (ring B: 3,,4,-diOH), pyrogallol (ring B: 3',4',5'-triOH), C2=C3 + C4-C=O (double bond between C2-C3 and the presence of carbonyl on the carbon 4), C4-C=O + C5-OH (carbonyl on the carbon 4 and the presence of -OH on the carbon 5), C7-OH + C8-OH (presence of -OH group on the carbons 7 and 8), C3-OH + C4=O + C5-OH (presence of a carbonyl group and -OH groups on the carbon 3 and 5), catechol + C2=C3 + C4-C=O, catechol + C4-C=O + C5-OH, pyrogallol + C2=C3 + C4-C=O, and pyrogallol + C4-C=O + C5-OH.
By using catechol as the enzymatic substrate, the amperometric response was linear of 1.3 x [10.sup.-8] to 1.5 x [10.sup.-4] mol [L.sup.-1], with a limit of detection of 6.0 x [10.sup.-9] mol [L.sup.-1].
Multidentates [beta]-diketonates biscatecholamide ligands [6] have six binding sites due to the O-donor of catechol aromatic ring and [beta]-diketonates [7, 8].