Arginic acid

Fig. 9 Crosslink formation model of calcium arginic acid.

Gellan Arginic acid Pectinic acid Addition of Crosslinking by coordination bonding... 

Aiginic acid, a seaweed polysaccharide, is a block copolymer of gluronic acid and manuronic acid. If a multivalent ion such as calcium is added to this solution, it gels. For the crosslink point structure, an egg-box model where manuronic acid surroimds the calcium ion has been proposed. In general, similar to what happens with arginic acid, polysaccharide electrolytes gel upon ion pair formation. It is difficult to observe this process... 

Aggregation process, 132, 213 Amorphous polystyrene (a-PS), gelation, 191-2 Angular frequency, 322 Anisotropically shaped gels, 89-90 Anomalous viscosity, 112 Arginic acid salt, 114 Atago refractometer, 395, 397 Atomic force microscopy (AFM), 221, 235-49 application to gels, 245-7 fundamental principles, 242-4 Autocorrelation function (ACF), 195, 205... 

Anionic-type caiboxymethylcellulose (CMC) [3], arginic acid [4,5], hyalinonic acid [6], poly(glutamic acid) [7, 8]... 

Argine and lysine are believed to be important, but results are not clear because sea snake neurotoxins contain several residues of these amino acids (7). 

A group of peptide derivatives such as peptide arginals and boronic acid peptide derivatives belong to another class of reversible thrombin inhibitors. One such inhibitor is PPACK (D-Phe-Pro-Arg chloromethyl ketone), which functions as a powerful irreversible thrombin inhibitor by alkylating the histidine residue at the catalytic site of thrombin (58). It, however, is unstable in neutral solution, as it undergoes cyclization and inactivation. However, the D-methyl derivative of D-Phe-Pro-Arg-H (D-Mephe-Pro-Arg-H) called efegatran, with a molecular mass of 515 Da, is a stable selective reversible inhibitor of thrombin with a K. of approximately 100 nM. The basic amino terminus in this compound is responsible for promoting the specificity toward thrombin (63). 

N2 Cocoyl-L-arginine ethyl ester DL-pyrrolidone carboxylic acid salt. See PCA ethyl cocoyl arginate... 

Naphthol Nickel chloride hexahydrate PCA ethyl cocoyl arginate Phenoxyethanol Phenylmercuric nitrate, basic o-Pheny I phenol Picric acid Potassium alum anhydrous Potassium bisulfite Potassium iodide... 

Pantothenic acid Pantothenic acid polypeptide Papain PCA ethyl cocoyl arginate PEG-105 behenyl propylenediamine... 

Inhibitor peptides low molecular mass oligopeptide-fatty acid compounds of microbial origin which irreversibly inactivate plant and animal proteases. The inhibition is stoichiometric, i.e. 1 molecule I.p. inhibits 1 molecule enzyme. Examples are Leupeptin [acetyl-(or propionyl-)L-Leu-L-Leu-arginal the L-leu-cine can also be replaced by L-isovaline or L-valine], from Streptomyces species, inhibits cathepsin B, papain, trypsin, plasmin and cathepsin D, the effectiveness of the inhibition decreasing in that order. Pepsta-tin (isovaleryl-L-Val-L-Val-P-hydroxy-Y-NH2- -CH3-heptanoyl-L-Ala-P-hydroxy-Y-NHj-e-heptanoic acid), from actinomycetes, inhibits pepsin and cathepsin D. Chymostatin inhibits all known chymotrypsin types, cathepsin A, B, and D and papain. Antipain inhibits papain trypsin and plasmin. 

The specificity of the trypsin is very high. Trypsin attacks peptide bonds formed by the carboxyl group of a basic amino acid argine and lysine with the amino group of another amino acid. Consequently, when the number of basic amino acids in a substrate is known, the exact number of polypeptides that will appear in trypsin can be predicted. 

Since then, secretin has been purified and found to be a strongly basic polypeptide hormone (mol wt 5,000) composed of 27 amino acids. Its amino acid sequence resembles that of gastrin and includes 4 argine units. A specific enzyme (secretinase) in blood seems to be capable of hydrolyzing secretin selectively. 

Argine and valine can be detected electrochemically with a detection limit for argine of ca. 100 ng (signal noise of 4 1). The detector is rather less sensitive towards valine. The conditions used to chromatograph and detect these amino acids were a Lichrosorb RP-8 column eluted with O.IM aqueous phosphate buffer (pH 6.7) with an applied potential of +1.62 V vs Ag/AgCl. The literature contains reports [22,23] of other amino acids being detected electrochemically and this method may be generally applicable for amino acids. 

Uses Corrosion inhibitor, demulsifier in crude oil processing emulsifier for pesticides, bitumen anticaking agent surfactant in acid cleaners N2 Cocoyl-L-arginine ethyl ester DL-pyrrolidone carboxylic acid salt. See PCA ethyl cocoyl arginate... 

Patent alum. See Aluminum sulfate PBTC. See 2-Phosphonobutane tricarboxylic acid-1,2/4 PCA ethyl cocoyl arginate CAS 95370-65-3 EINECS/ELINCS 305-928-2... 

Synonyms N2 Cocoyl-L-atginine ethyl ester DL-pyrrolidone carboxylic acid salt PCA ethyl N-cocoyl-L-arginate DL-Proline, 5-oxo-, compd. with N2-coco acyl-L-arginine ethyl ester... 

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