Application of gas chromatography to qualitative and quantitative copolyamide analysis

Abstract

shape for minimum error will shift toward sharper peaks (1). This shift in turn suggests some decrease in optimum r. The over-all effect of increasing base line uncertainty will be to increase the error with which the peak area can be measured, but not to significantly change the fractional height at which the peak width is measured.The above analysis was derived for Gaussian peaks. As real peaks frequently show tailing, which increases the width near the base, a slightly larger value of r may be preferable to that predicted for this generalized case.Practical Choice of Fractional Height. It is clear that no

Determination of amide, urea, and nitrile compounds using alkali-fusion reaction gas chromatography

“…For polyamides composed of diamine and dibasic acids, general analysis schemes incorporating acid hydrolysis exist (6). Modifications using acid hydrolysis followed by gas chromatographic procedures have resulted in qualitative and quantitative analysis of homoand copolymers of polyamide resins (7,8).…”

Inhibition of cold insolubility of an IgA cryoglobulin by decanedicarboxylic acid and related compounds

“…The content of the tube was then saturated with NaCl and extracted with ethylacetate according to method of Nirva et a1 [2]. The extracts were dried in vacuum and were methylated after dissolving in methanol with BF3-methanol [3]. Methyl derivatives were extracted in n-hexane and estimated by gas chromatography (Sigma model 3, equipped with FID, Perkin-Elmer) by injecting 2 pl of extract using 10% SP 2340 cyanosilicone stationary phase on 100/120 chromosorb W AW 6' X 1/8" S.S. column (Supelco) at 190"C, with the detector temprature at 250°C and using helium at a flow rate of 30 ml/min as the carrier gas.…”

Comparison of the chemical composition of lipomannan from Micrococcus agilis membranes with that of Micrococcus luteus strains

“…Fatty acids were identified and quantified as their methyl esters by methylation after mild alkaline hydrolysis [19] by GLC at 120-150°C (temperature increase 2°C/min) on a column of GP 10% SP-2330 and 100/120 chromosorb WAW (Supelco, Inc., Bellefonte, PA). Succinyl residues released by alkali treatment of lipomannan were quantified as their methyl esters as described by Anton [20] by GLC (GP 10% SP-1000/1% HzPO4) on 100/120 chromosorb WAW (Supelco, Inc., Bellefonte, PA) at 140°C and N 2 carrier gas flow rate of 50 ml/min. Peak areas of all GLC separations were quantified by weighing photocopies of peaks recorded on charts.…”