Simple Colorimetric Method for Determination of Episulfides, Using, 4-(p-Nitrobenzyl)-Pyridine
نویسنده
چکیده
Episulfides were determined by a simple colorimetric assay using 4-(p-nitrobenzyl)-pyridine, which has been used previously for the detection and analysis of epoxides, organophosphates, and other alkylating agents. With episulfides, absorbance was directly proportional to concentration up to an absorbance of at least 1.0. No interference was observed with a variety of non-episulfide sulfur-containing substances. The colorimetric method is useful in monitoring l-cyanoepithioalkane formation from the degradation of glucosinolates containing terminal double bonds.
منابع مشابه
New Method for Determination of Alkylating Agents in Biologic Fluids.
An accurate, reproducible colorimetric method for determining minute amounts of alkylating agents in biologic fluids has been developed. Utilizing this method, we have been able to detect less than 0.1 g. of nitrogen mustard (HN2), or Thio-TEPA in 1 ml. of plasma, lymph, urine, or tissue homogenate. The biologic fluid was deproteinized with zinc sulfate, barium hydroxide, and methanol; the supe...
متن کاملChitosan Capped Silver Nanoparticles as Colorimetric Sensor for the Determination of Iron(III)
A selective, simple and low-cost method for the colorimetric determination of Fe3+ ions based on chitosan capped silver nanoparticles (Chit-AgNPs) was presented. Chitosan is a cationic polyelectrolyte and possesses amino and hydroxy groups which make it widely used as a capping agent for Ag NPs. The synthesized chitosan capped silver nanoparticles with excellent colloidal stability were charact...
متن کاملDirect colorimetric determination of hippuric acid in urine.
In 1963 Umberger and Fiorese (1) introduced a colorimetric method for HA,1 based on the color reaction of HA, dissolved in anhydrous pyridine, with BSC. Therefore, for applying their method to determine HA in urine, HA must first be extracted from the urine. We found that HA dissolved in water-pyridine (1:1, by vol) produces a red-orange color when BSC is added at room temperature. The absorpti...
متن کاملDye Concentrations Determination in Ternary Mixture Solution by Using Colorimetric Algorithm
This publication uses a colorimetric method based on the absorbance spectra of dye solutions to improve on Beer’s law when calculating the dye concentrations of a three-component mixture. The performance of the new method is compared with that of Beer’s law evaluated at three wavelengths, and Beer’s law evaluated at 16 wavelengths. Colorimetric method gives the best prediction of d...
متن کاملThe colorimetric estimation of alpha-amino nitrogen in tissue fluids.
Various authors have reported methods for the colorimetric estimation of alpha-amino nitrogen with ninhydrin (Moore and Stein, 1948, 1954; Smith and Agiza, 1951 ; Troll and Cannan, 1953; Yemm and Cocking, 1955; Kalant, 1956; Rosen, 1957). Only Kalant has applied this method to the direct measurement of alpha-amino nitrogen in biological fluids; he reported on the determination of total alpha-am...
متن کامل