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Abstract
A new etherified starch, δ-hydroxybutyl starch (δ-HBS), was prepared by utilising 4-chlorobutan-1-ol as the etherifying reagent. The method of Zeisel gas chromatography for the determination of the molar substitution was described. This technique offers a simple and rapid method for quantitative analysis with reproducible results. Meanwhile, the mechanism of the Zeisel reaction was also investigated.
Highlights
The increasing industrial importance of hydroxyalkyl starch has created interest in methods for its analysis
Zeisel gas chromatography has been employed as an analytical technique for the determination of the hydroxyethyl group in hydroxyethyl starch with the quantitative conversion of the substituted alkoxyl unit to the corresponding iodide by reaction with hydriodic acid [6,7,8,9], this technique offers a simple and rapid method for quantitative analysis with reproducible results
Latter is the Different from the cleavage of hydroxypropyl and hydroxyethyl starch [7,9,21] (Figure 3) or major reaction product. As it is mentioned in the mechanism, the first generated diiodo cellulose ethers [11], the procedure of displacement reaction of 4-hydroxybutyl starch ether intermediate (i) proceeds through two routes to the desired alkyl iodide
Summary
The increasing industrial importance of hydroxyalkyl starch has created interest in methods for its analysis. Several analytical methods have been developed over the years for the determination of the molar substitution ratio of hydroxyalkyl starch. Zeisel gas chromatography has been employed as an analytical technique for the determination of the hydroxyethyl group in hydroxyethyl starch with the quantitative conversion of the substituted alkoxyl unit to the corresponding iodide by reaction with hydriodic acid [6,7,8,9], this technique offers a simple and rapid method for quantitative analysis with reproducible results. The simplicity, low cost, and accuracy of the procedure make it attractive as a routine procedure for industrial application
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