Determination of the Degree of Substitution of Cationic Guar Gum by Headspace-Based Gas Chromatography during Its Synthesis

• DOI: 10.1021/acs.jafc.7b03144
• Publication Date: 2017-07-27T20:49:24Z
• Authors: Xiaofang Wan; Congbao Guo; Jiarui Feng; Teng Yu; Xin-Sheng Chai; Guangxue Chen; Wei-Qi Xie
• Keywords: Guar gum; Cationic polymerization; Kjeldahl method

This study reports on a headspace-based gas chromatography (HS-GC) technique for determining the degree of substitution (DS) cationic guar gum during synthesis process. The method is based determination 2,3-epoxypropyltrimethylammonium chloride in process medium. After modest pretreatment procedure, sample was added to headspace vial containing bicarbonate solution measurement evolved CO2 by HS-GC. results showed that had good precision (relative standard deviation <3.60%) and accuracy measurement, with recoveries range 96-102%, matching data obtained reference method, were within 12% values more arduous Kjeldahl calculated DS gum. HS-GC requires only small volume and, thus, suitable laboratory-scale process-related applications.