Detail of "25140-86-7"

Reference

Capillary electrophoresis of herbicides: IV

Capillary electrophoresis of herbicides: IV. Evaluation of octylmaltopyranoside chiral surfactant in the enantiomeric separation of fluorescently labeled phenoxy acid herbicides and their laser-induced fluorescence detection. Mechref, Yehia; El Rassi, Ziad (Dep. Chem., Oklahoma State Univ., Stillwater, OK 74078-3071, USA). Electrophoresis, 18(2), 220-226 (English) 1997 VCH. CODEN: ELCTDN. ISSN: 0173-0835. DOCUMENT TYPE: Journal CA Section: 5 (Agrochemical Bioregulators) A novel chiral nonionic surfactant, namely octyl b-D-maltopyranoside (OM), was evaluated in chiral capillary electrophoresis of fluorescently labeled phenoxy acid herbicides. The labeling of the analytes with 7-aminonaphthalene-1,3-disulfonic acid (ANDSA) permitted a concn. detection limit of 5 ′ 10-10M using laser-induced fluorescence detection. This limit of detection allowed the detn. of ultradiluted solns. of the ANDSA-derivatized phenoxy acid herbicides whose concn. was as low as 10-11M (i.e. 2.2 ppt.) by applying the concept of field-amplified sample staking (FASS). The sample injection by FASS did not adversely affect sepn. efficiencies, resoln. and reproducibility of the electrophoresis system. The tagging of the phenoxy acid herbicides with ANDSA increased the hydrophobicity herbicides in the OM micellar phase. The net results of this effect were a much shorter anal. time and an improved enantiomeric resoln. of the derivs. when compared to underivatized phenoxy acid herbicides. The optimum surfactant concn. required for max. resoln. decreased with increasing hydrophobicity of the analyte, with the least hydrophobic analyte requiring higher surfactant concn. Because of the two permanently charged sulfonic acid groups of the ANDSA tag, the pH of the running electrolyte had little effect on the enantiomeric resoln. of the derivatized herbicides. Due to its salting-out effect and increasing the micellized surfactant concn., increasing the ionic strength of the running electrolyte increased the enantiomeric resoln. of the least hydrophobic analytes. Conversely, increasing the percent methanol in the running electrolyte decreased the enantiomeric resoln. of the least hydrophobic analytes due to a decrease strength of solute-micelle assocn. 187227-35-6 and 25140-86-7 are just another two chemicals used in this study. For hydrophobic analytes, existed an optimum percent of methanol existed for max. enantiomeric resoln. .

Synthesis and structural characterization of 1,2-dimethyl-3,5-diphenylpyrazolium salts of phenoxycarboxylic acids

Synthesis and structural characterization of 1,2-dimethyl-3,5-diphenylpyrazolium salts of phenoxycarboxylic acids. Wang, Guilin; Liu, Yuanfa; Yang, Yunna (Dep. Chem., Northwest Univ., Xian, Peop. Rep. China). Gaodeng Xuexiao Huaxue Xuebao, 4(5), 585-8 (Chinese) 1983. CODEN: KTHPDM. ISSN: 0251-0790. 25140-86-7 and 614-61-9 are also in the experiment. DOCUMENT TYPE: Journal CA Section: 28 (Heterocyclic Compounds (More Than One Hetero Atom)) Section cross-reference(s): 5 Herbicidal (no data) 1,2-dimethyl-3,5-diphenylpyrazolium salts of phenoxyalkanoic acids (I) (R = H, Me; R1 = H, 2-Cl, 2-Me, 2-Br; R2 = H, 2-Cl, 3-Cl, CF3, 4-Cl, Br, iodo, Me, NO2) were prepd. by neutralization of pyrazolium hydroxide (II) aq. soln. with PhOCHRCO2H. .