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Some of the active ingredients found in common tanning lotions include melanin and L-Tyrosine. [3] Other commonly found ingredients include tea oil, copper (in many different chemical compounds), green tea extract and many other natural oils. Indoor tanning lotions are usually designed to only use ingredients that will not cause damage or build ...
In addition to the common amino acid L-tyrosine, which is the para isomer (para-tyr, p-tyr or 4-hydroxyphenylalanine), there are two additional regioisomers, namely meta-tyrosine (also known as 3-hydroxyphenylalanine, L-m-tyrosine, and m-tyr) and ortho-tyrosine (o-tyr or 2-hydroxyphenylalanine), that occur in nature.
This page was last edited on 24 July 2006, at 19:38 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...
The enzyme tyrosine phenol-lyase (EC 4.1.99.2) catalyzes the chemical reaction L -tyrosine + H 2 O ⇌ {\displaystyle \rightleftharpoons } phenol + pyruvate + NH 3 This enzyme belongs to the family of lyases , specifically in the "catch-all" class of carbon-carbon lyases.
Aurone synthase purified from Coreopsis grandiflora shows weak tyrosinase activity against isoliquiritigenin, but the enzyme does not react with the classic tyrosinase substrates l-tyrosine and tyramine and must therefore be classified as catechol oxidase. [49] Laccase, a multi-copper oxidase, is often considered a subclass of polyphenol ...
Originally developed in Japan, it is the preferred method used by manufacturers such as L'Oréal. Instead of measuring erythema, the PPD method uses UVA radiation to cause a persistent darkening or tanning of the skin. Theoretically, a sunscreen with a PPD rating of 10 should allow a person 10 times as much UVA exposure as would be without ...
In enzymology, a tyrosine—arginine ligase (EC 6.3.2.24) is an enzyme that catalyzes the chemical reaction. ATP + L-tyrosine + L-arginine AMP + diphosphate + L-tyrosyl-L-arginine. The 3 substrates of this enzyme are ATP, L-tyrosine, and L-arginine, whereas its 3 products are AMP, diphosphate, and L-tyrosyl-L-arginine.
The enzyme tyrosine decarboxylase (EC 4.1.1.25) catalyzes the chemical reaction. L-tyrosine tyramine + CO 2. Hence, this enzyme has one substrate, L-tyrosine, and two products, tyramine and carbon dioxide. This enzyme belongs to the family of lyases, specifically the carboxy-lyases, which cleave carbon-carbon bonds.