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Determination of the degree of substitution of hydroxypropyl guar gum is important as it provides information about the inhomogeneous substitution that may seriously affect the properties in various applications. In this study, the pyrolysis products of guar gum and hydroxypropyl guar gums were examined by gas chromatography and GC–MS spectrometry. Results showed that 1,2-propanediol was the product...
The substituent distribution in hydroxypropyl guar gums was characterized by chemical methods in this study. A new method based on periodate oxidation combined with probability analysis was proposed to determine the degree of substitution at secondary hydroxyl groups. The periodate oxidation was investigated at pH=4.3 and at the temperature of 25°C. The oxidized products were characterized by IR and...
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