A highly sensitive high-performance liquid chromatography method for the estimation of ascorbic and dehydroascorbic acid in tissues, biological fluids, and foods

Solid State Postcolumn Reactor for the E

Solid State Postcolumn Reactor for the Electrochemical Detection of Ascorbic and Dehydroascorbic Acids in High Performance Liquid Chromatography

✍ S. Karp; C.S. Helt; N.H. Soujari 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 246 KB

A postcolumn reactor which reduces dehydroascorbic acid to ascorbic acid for use in high-performance liquid chromatography is described. This reactor permits the direct determination of both ascorbic and dehydroascorbic acids after their chromatographic separation. 1993 Academic Press, Inc.

A rapid and highly sensitive method for

A rapid and highly sensitive method for determination of picogram levels of norepinephrine and epinephrine in tissues by high-performance liquid chromatography

✍ Yoshiki Yui; Yoshinori Itokawa; Chuichi Kawai 📂 Article 📅 1980 🏛 Elsevier Science 🌐 English ⚖ 261 KB

We report a new, rapid, and sensitive high-performance liquid chromatographic method for the regional catecholamine determination in tissues. Deproteinized specimens are directly injected onto the double column (the top anion-exchange column; CDR-20, and the bottom cation-exchange column; Zipax-SCX)

Determination of Ascorbic Acid and Dehyd

Determination of Ascorbic Acid and Dehydroascorbic Acid in Biological Samples by High-Performance Liquid Chromatography Using Subtraction Methods: Reliable Reduction with Tris[2-carboxyethyl]phosphine Hydrochloride

✍ Jens Lykkesfeldt 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 68 KB

Determination of dehydroascorbic acid in biological samples most commonly involves indirect measurement. The concentration is calculated by subtraction of the measured ascorbic acid concentration from that of total ascorbic acid analyzed after reduction of the dehydroascorbic acid present; a methodo

A simple, sensitive assay for the spermi

A simple, sensitive assay for the spermicide nonoxynol-9 in biological fluids by high-performance liquid chromatography

✍ Gary J. Beck; Dulcie Kossak; Subhash J. Saxena 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 264 KB

Use of high performance liquid chromatog

Use of high performance liquid chromatography for the identification and estimation of zearalenone, patulin and penicillic acid in food

✍ David C. Hunt; Ann T. Bourdon; Neil T. Crosby 📂 Article 📅 1978 🏛 John Wiley and Sons 🌐 English ⚖ 291 KB

Determination of Ascorbic Acid and Dehyd

Determination of Ascorbic Acid and Dehydroascorbic Acid in Biological Samples by High-Performance Liquid Chromatography Using Subtraction Methods: Reliable Reduction with Tris[2-carboxyethyl]phosphine Hydrochloride: Volume 282, Number 1 (2000), pages 89–93

✍ Jens Lykkesfeldt 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 16 KB

On page 91, column 1, lines 10 -18, the mobile phase description contained errors as printed. The correct mobile phase composition is printed here: One liter of mobile phase consisted of 17.8 g sodium dihydrogen phosphate monohydrate (129 mM), 17.6 g sodium acetate anhydrous (215 mM), 372 mg disodiu