Pharmaceutics, Drug Delivery and Pharmaceutical TechnologySome Preformulation Studies of Pyruvic acid (cas 127-17-3) and Other α-Keto Carboxylic Acids in Aqueous Solution: Pharmaceutical Formulation Implications for These Peroxide Scavengers
-
Add time:09/27/2019 Source:sciencedirect.com
The purpose of this study is to assess some of the variables determining the aldol-like condensation of Pyruvic acid (cas 127-17-3) (1), a peroxide scavenger, in aqueous solution to parapyruvic acid and higher oligomers. Its stability is compared to 3 other α-keto carboxylic acids, 2 with sterically hindered methylene groups alpha to the keto functionality (2-3) and phenylglyoxylic acid (4) with no methylene group. High-performance liquid chromatography, nuclear magnetic resonance, and liquid chromatography mass spectroscopy techniques are used in the kinetics and product analyses. 1 condensation is concentration dependent and base catalyzed above pH 7, consistent with the reaction mechanism proceeding through the attack of the fraction of the methylene group, alpha to the keto group, in its anionic form, at the keto group of a second molecule of 1. The major product is confirmed to be parapyruvic acid, but higher-order oligomers are also observed. All 3 of the other α-keto carboxylic acids 2-4 are considerably less reactive, with 4 being completely stable. Stable solutions of 1 can be prepared by the use of relatively dilute solutions maintained at slightly acidic pH values. 1 prevents the oxidation of methionine on addition of hydrogen peroxide.
We also recommend Trading Suppliers and Manufacturers of Pyruvic acid (cas 127-17-3). Pls Click Website Link as below: cas 127-17-3 suppliers
Prev:Does interfacial photochemistry play a role in the photolysis of Pyruvic acid (cas 127-17-3) in water?
Next:Oxidative dehydrogenation of lactic acid to Pyruvic acid (cas 127-17-3) over Pb-Pt bimetallic supported on carbon materials) - 【Back】【Close 】【Print】【Add to favorite 】
- Related Information
- Analytical MethodsOptimized method for the quantification of Pyruvic acid (cas 127-17-3) in onions by microplate reader and confirmation by high resolution mass spectra09/28/2019
- Oxidative dehydrogenation of lactic acid to Pyruvic acid (cas 127-17-3) over Pb-Pt bimetallic supported on carbon materials10/01/2019
- Does interfacial photochemistry play a role in the photolysis of Pyruvic acid (cas 127-17-3) in water?09/26/2019
- Biosynthesis of Pyruvic acid (cas 127-17-3) from glycerol-containing substrates and its regulation in the yeast Yarrowia lipolytica09/25/2019
- Mesoporous Sn(IV) doping MCM-41 supported Pd nanoparticles for enhanced selective catalytic oxidation of 1,2-propanediol to Pyruvic acid (cas 127-17-3)09/24/2019
- Pyruvic acid (cas 127-17-3) prevents Cu2+/Zn2+-induced neurotoxicity by suppressing mitochondrial injury09/10/2019
- Investigating the inotropic effect of Pyruvic acid (cas 127-17-3) on the isolated rat heart and its underlying mechanism09/09/2019
-
Health and Chemical more >