Detail of "687-69-4"

Reference

Fluorimetric determination of catecholamines using glycylglycine as the reagent for post-column derivatization

Fluorimetric determination of catecholamines using glycylglycine as the reagent for post-column derivatization. Seki, Tokuichiro; Yamaguchi, Yoshihisa (Coll. Bio-Med. Technol. Nursing, Osaka Univ., Toyonaka 560, Japan). J. Chromatogr., 287(2), 407-12 (English) 1984. CODEN: JOCRAM. ISSN: 0021-9673. DOCUMENT TYPE: Journal CA Section: 2 (Mammalian Hormones) Norepinephrine [51-41-2], epinephrine [51-43-4], dopamine [51-61-6], and isoproterenol [7683-59-2] were detd. in std. soln. and in human urine samples by fluorometric anal. 51-43-4 and 51-61-6 which are cas registry numbers are also used here. after chromatog. on Amberlite IRC-50 and derivatization in the presence of glycylglycine [556-50-3], hexacyanoferrate(III), and ZnSO4 at pH 7-8. Alanylglycine [687-69-4] also gave fluorescent derivs. under similar conditions. Excitation and emission max. of the 4 catecholamines occurred at 350 and 500 mm, resp. Based on 6 detns. of 4-mL aliquots of the same human urine sample, the amts. of epinephrine, norepinephrine, and dopamine were 7.2, 62, and 217 ng/mL, resp. Recovery was 95-105% for all the catecholamines. Thus, the proposed method is suitable for on-line fluorimetric assay of catecholamines in clin. and biol. samples. .

Complex formation of dioxovanadium(V) with alanine, alanylalanine and alanylglycine

Complex formation of dioxovanadium(V) with alanine, alanylalanine and alanylglycine. Gharib, Farrokh; Fekri, Mohammad Hossein; Shamel, Ali (Chemistry Department, Shahid Beheshti University, Tehran, Iran). Reviews in Inorganic Chemistry, 23(1), 111-123 (English) 2003 Freund Publishing House Ltd. CODEN: RICHD7. ISSN: 0193-4929. DOCUMENT TYPE: Journal CA Section: 68 (Phase Equilibriums, Chemical Equilibriums, and Solutions) Section cross-reference(s): 34, 72, 73 The stability consts. of the systems alanylalanine, alanylglycine, and alanine with dioxovanadium(V) have been detd. in aq. soln. in 0.8 ￡ pH ￡ 2.There are some commonly used reagents with their cas registry numbers 687-69-4 and 20644-97-7 in this article.5 at 25°C and 0.1 mol dm-3 (NaClO4), using a combination of potentiometric and spectrophotometric techniques. Dioxovanadium(V) forms two mononuclear 1:1 and 1:2 species with the ligands, of the type VO2HL+ and VO2(HL)2+. .