Convenient Method For Quantitative Determination Research Articles

Ion association of carrageenan with pinacyanol dye for analytical purpose

Interactions between anionic polyelectrolyte and cationic dye have been investigated, using kappa carrageenan as well as pinacyanol dye as an example. Changes in the absorption UV–Vis spectra observed during the increase of carrageenan content in the mixture with pinacyanol dye were described. An association mechanism in the system: polymer anions/dye cations was proposed and the values of parameters characterizing this phenomenon were determined. The interactions between carrageenan and pinacyanol were proved to be a basis for the development of a convenient method for quantitative determination of anionic polymers (especially carrageenan) in aqueous solutions.

Quantitative Determination of PA6 and/or PA66 Content in Polyamide-Containing Wastes

A fast, robust, and convenient method for quantitative determination of polyamide-6 (PA6) and polyamide-66 (PA66) in plastic wastes is presented. The method includes a straightforward procedure for...

A Spectroscopic Method for Hydroxyl Value Determination of Polyols

AbstractA relatively simple method is described for routine determination of hydroxyl values for a wide range of hydroxyl containing compounds including soybean oil polyols, polyols derived from soy meal, polyether polyols and ethylene glycol as well as their blends. This method is based on reacting the hydroxyl compound with hexamethyldisilazane (HMDS) and determining the FTIR peak area of the silylated product at 1,251 cm−1. The method is simple, accurate and reproducible. It is not limited to a specific family of polyol compounds. It does not require any special equipment, hazardous chemicals and can be carried out by non‐technical staff as a rapid and convenient method for quantitative determination of hydroxyl values. An excellent linear correlation was obtained between this spectroscopic method and conventional titration methods for different polyols over a wide range of hydroxyl values. Furthermore, unlike the titration methods the current method is not affected by the presence of acid, base or small amounts of water in the test sample.

Quantitative analysis of mixtures of drug delivery system components by Raman microscopy

AbstractA series of two‐component powders and tableted mixtures of corn starch and lactose‐monohydrate were prepared and studied using the fiber optic sensor of a LabRam dispersion Raman microscope in order to establish a convenient method for quantitative determination of their concentration based on Raman spectra. The intensities of certain characteristic peaks of the components were used for calculating the calibration curve. Linear calibration curves were found in the concentration range of 10–80% with correlation coefficients of 0.9979–0.9996 for powders and tablets. Chemical mapping of the tablets was also carried out, thus allowing determination of the distribution of the components. Copyright © 2003 John Wiley & Sons, Ltd.

Differential pulse polarography ? a convenient method for quantitative determination of 2-bromo-2-bromomethyl-pentanedinitrile (?1,2-dibromo-2,4-dicyanobutane?) [1

Differential pulse polarography ? a convenient method for quantitative determination of 2-bromo-2-bromomethyl-pentanedinitrile (?1,2-dibromo-2,4-dicyanobutane?) [1

The production of 2-methylisocitric acid from odd-carbon n-alkanes by a mutant of Candida lipolytica.

The productivity of 2-methylisocitric acid by a mutant, No. R-2, derived from Candida lipolytica IFO 1659 was examined from different carbon sources. The mutant produced this acid in large amounts mainly from odd-carbon n-alkanes. The ratio of this acid to total acids produced from alkanes increased as the number of carbon atoms of alkane decreased. From these findings, it was inferred that the amount of this acid produced depended on the available amount of C3-residue derived from odd-carbon n-alkanes after successive removal of C2-fragments. A hypothetical pathway of this acid accumulation from odd-carbon n-alkanes by this mutant is suggested. The present paper also describes a convenient method for quantitative determination of polybasic acids by gas chromatography.