文章基本信息

标题：Comparison of Three Methods to Determine the Degree of Substitution of Quinoa and Rice Starch Acetates, Propionates, and Butyrates: Direct Stoichiometry, FTIR, and 1H-NMR
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作者：Nabilah Abdul Hadi ; Berthold Wiege ; Sebastian Stabenau 等
期刊名称：Foods
电子版ISSN：2304-8158
出版年度：2020
卷号：9
期号：1
页码：83-96
DOI：10.3390/foods9010083
出版社：MDPI Publishing
摘要：Rice and quinoa starch esters were prepared by acylation using short-chain fatty acid anhydrides with different chain lengths (acetic, propionic, and butyric anhydride). A direct stoichiometric method based on the acylation reaction was used to determine the degree of substitution (DS) and acyl content (AC). In addition, Fourier-transform infrared spectroscopy (FTIR) was used to validate the conformational changes of acylated starch and 1H-NMR was used as a DS reference method. DS by stoichiometric calculation was shown to be in agreement with FTIR and was comparable with DS obtained from Proton nuclear magnetic resonance (1H-NMR). Based on this study, stoichiometric calculation allows rapid and direct determination of substitution levels and acyl content without the loss of samples, which provides efficiency and optimization of manufacturing procedures in producing the desired level of esterified starches.
关键词：modified starch; short-chain fatty acid; degree of substitution; stoichiometry; FTIR; 1 H-NMR modified starch ; short-chain fatty acid ; degree of substitution ; stoichiometry ; FTIR ; 1 H-NMR