Carboxylation

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carboxylation

[kär‚bäk·sə′lā·shən]
(organic chemistry)
Addition of a carboxyl group into a molecule.

Carboxylation

 

the direct introduction of the carboxyl group —COOH to organic compounds by the action of CO2. For example, carboxylation of organometallic compounds occurs during the passage of CO2 through a solution of the compound; subsequent hydrolysis yields carboxylic acid:

Salicylic acid and ^-aminosalicylic acid (PASA), used in medicine, are obtained through a singular carboxylation process involving the corresponding phenolates, for example

Carboxylation in an organism is effected by specific enzymes, forexample, pyruvate carboxylase catalyzes the carboxylation ofpyruvic acid. Carboxylation plays an important role in the oxida-tion of intermediate products of the decomposition of carbohy-drates, fats, and proteins in the organism.

References in periodicals archive ?
For example, both PA-6,6 and PP tend to neck before 25% elongation, whereas the compatibilized blend containing 30% carboxylated PP resists necking up to 25% elongation.
The proportion of carboxylated to total or intact osteocalcin in serum discriminates warfarin-treated patients from control subjects.
For more information and details about the research, see the forthcoming manuscript entitled "Cytotoxicity Screening of Single-Walled Carbon Nanotubes: Detection and Removal of Cytotoxic Contaminants from Carboxylated Carbon Nanotubes" by Wang et al, that has been recommended for publication in Molecular Pharmaceutics.
After 8 weeks of vitamin K2 treatment, blood levels of carboxylated osteocalcin and vitamin K2 rose, while measures of undercarboxylated (i.
FINE-CLAD M-8792 is a carboxylated polyester designed to cure with beta-hydroxyalkylamides (or Primid(R)) to produce coatings with excellent exterior durability.
This carboxylated styrene-butadiene dispersion is said to deliver important advantages that can help carpet manufacturers make better products.
This grade is specifically designed to improve the scorch time of carboxylated nitrile rubbers relative to standard zinc oxide, according to the company's one-page technical bulletin.
Session 5 on advances in synthetic latex will include the following presentations: "Crosslinking in carboxylated nitrile rubber dipped films," Andrew Kells and Robert Groves, Synthomer Ltd.
Teeuwen, Radium Foam BV, The Netherlands; "Novel accelerators for synthetic polyisoprene and carboxylated nitrile latices," K.
The company's 2005 Product Guide provides information on Nipol nitrile elastomers, carboxylated nitrile elastomers, high-performance terpolymers, terpolymer elastomers, liquid nitrile elastomers, polyblack masterbatches, nitrile powder and crumb elastomers, and Nipol and Sivic polyblends and pre-plasticized nitrile elastomers; Zetpol hydrogenated nitrile elastomers; Zeoforte modified hydrogenated nitrile elastomers; HyTemp/Nipol AR polyacrylate elastomers and AR Super ACM polyacrylate elastomers; HyTemp polyacrylate curatives; Zeotherm thermoplastic vulcanizates; Hydrin polyepichlorohydrin elastomers; Zisnet polyepichlorohydrin and polyacrylate curing agent; Zealloy modifiers for thermoplastics; DuoMod tougheners; Quintac SIS rubber; and more.
Materials covered will include acrylic rubbers; ethylene-vinyl acetate rubber; chlorosulfonated ethylene elastomers; fluoroelastomers; perfluoroelastomers; epichlorohydrin rubber; chlorinated polyethylene; hydrogenated nitrile rubber; hydrogenated carboxylated nitrile rubber; fluorosilicone elastomers; and silicone elastomers.
Therban XT (HXNBR hydrogenated carboxylated acrylonitrile-butadiene rubber) is said to offer improvements in mechanical and adhesion properties and abrasion resistance, as well as unusually high tear strength at high temperatures when compared with regular HNBR and other synthetic elastomers.