Ascorbic acids liquid chromatography

Feubolt, R. and Klein, H., Determination of sulphite and ascorbic acid by high-performance liquid chromatography withe electrochemical detection,. Chromatogr., 640, 271, 1993. [Pg.276]

Modified procedure (ASC kit) Ascorbic acid is isolated from plasma proteins and uric acid in a single-step liquid gel chromatography procedure and its amount... [Pg.513]

Liquid chromatography (LC) activated alumina applications, 2 400 adsorption, 1 610-611 of ascorbic acid, 25 760 basic principles, 4 603-606 classification of solvents for, 23 87... [Pg.181]

More recently [635], a unique extraction step in supplemented foods, by using hot water and a precipitation solution, following by HPLC-ELD/UV analysis has been performed for the simultaneous determination of pyridoxine, thiamine, riboflavin, niacin, pantothenic acid, folic acid, cyanoco-balamin, and ascorbic acid. The mobile phase consisting of phosphate buffer and methanol has been modified in order to perform ion-liquid chromatography by adding l-octanesulfonic acid sodium salt. Furthermore, triethylamine has been also added to improve peak symmetry. [Pg.637]

Shakya, R., Navarre, D. A. (2006). Rapid screening of ascorbic acid, glycoalkaloids, and phenolics in potato using high-performance liquid chromatography. J. Agric. Food Chem., 54, 5253-5260. [Pg.161]

Uronic acids have been studied similarly in connection with pectins384,523 and oligogalacturonic acids,170 fruits,319 and plants.66"524 Neukom and coworkers have studied the behavior of uronic acid and also aldaric acid derivatives.525 Ascorbic acid and its analogs526 have been separated by gas-liquid chromatography and determined291 in plant extracts. [Pg.76]

R Benlloch, R Farre, A Frigola. A quantitative estimate of ascorbic and isoascorbic acid by high performance liquid chromatography application to citric juices. J Liq Chromatogr 16 3113-3122,1993. [Pg.470]

WA Behrens, R Madere. Quantitative analysis of ascorbic acid and isoascorbic acid in foods by high-performance liquid chromatography with electrochemical detection. J Liq Chromatogr 15 753-765,... [Pg.471]

H Iwase, I Ono. Determination of ascorbic acid and dehydroascorbic acid in juices by high-performance liquid chromatography with electrochemical detection using L-cysteine as precolumn reduc-tant. J Chromatogr 654 215-220, 1993. [Pg.471]

J Carnevale. Determination of ascorbic, sorbic and benzoic acids in citrus juices by high-performance liquid chromatography. Food Tech Aust 32 302, 304-305, 1980. [Pg.617]

X. G. Fang, P. Shen, and S. Ghodbane, Mixed ion pair liquid chromatography method for the simultaneous assay of ascorbic acid, caffeine, chlorpheniramine maleate, dextromethorphan HBr monohydrate and paracetamol in Frenadol sachets, J. Pharm. Biomed. Anal., 72 85 (1994). [Pg.233]

R. Thomas, E. Roets, and J. Hoogmartens, Analysis of tablets containing aspirin, acetaminophen, and ascorbic acid by high-performance liquid chromatography, J. Pharm Sci., 73 1830 (1984). [Pg.399]

Reaction of an aqueous solution of cystine with thiamin, glutamate, and ascorbic acid produces a complex mixture of compounds with an overall flavor resembling that of roasted meat. The reaction was carried out at 120 C for 0.5h at pH 5.0 in a closed system. The aroma compounds were isolated by means of the simultaneous steam distillation/solvent extraction method. The flavor concentrate was pre-separated by liquid chromatography on silica gel and subsequently analysed by GC and GC/MS. Unknown flavor components were... [Pg.460]

Pachla, L.A. Kissinger, P.T. Determination of ascorbic acid in foodstuffs, pharmaceuticals, and body fluids by liquid chromatography with electrochemical detection. Anal. Chem. 1976, 48, 364-367. [Pg.1533]

Several investigators have reported that ascorbic acid can be analyzed by gas-liquid chromatography following conversion of the parent compound to its trimethylsilyl ether (61-66). The procedures have been found to be reliable and to produce results comparable with those obtained by colorimetric procedures. In most cases, however, measurement of only the reduced form of the vitamin is possible (67). One method is suitable for microanalytical work and has the advantage that several other carbohydrates and carbohydrate derivatives can be measured simultaneously in the same extract (67). [Pg.205]

Ascorbate Levels in Tissues. Several tissues were dissected from M. sexta and analyzed for L-ascorbic acid by high performance liquid chromatography (HPLC) (Figure 2), paper chromatography, or the dinitrophenylhydrazine method (5). As anticipated, L-ascorbic acid was... [Pg.280]

Assay methods for ascorbic acid have steadily improved. High performance liquid chromatography can now be used to separate and quantitate ascorbic, dehydroascorbic, and 2-ketogulonic acids. Improved analytical techniques are needed to identify and quantitate the oxidation products of ascorbic acid. [Pg.613]

Willson et al. (13) note that most analytical techniques (e.g., high-performance liquid chromatography [HPLC]) look specifically for the arrival of a single product of the reaction (or loss of a reactant), and they are therefore not necessarily of value in investigations of intermediates in the reaction process, but that isothermal microcalorimetry follows the entire process (see earlier text). By comparison of calorimetric data and analytical data, it was possible to propose a sequential reaction mechanism for ascorbic acid oxidation that could not be determined simply from analytical data. [Pg.272]

Giovanni B. Development of a quantitative method for the analysis of total 1-ascorbic acid in foods by high-performance liquid chromatography. J Chromatogr A 2007 l-2 97-102. [Pg.280]

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