Granular starch octenyl succinic anhydride (OSA) esters have most often been prepared in aqueous media, resulting in low reaction efficiencies and degree of substitution. In this study, granular maize and potato starch esters with OSA were synthesized in aqueous ionic liquid (IL) solutions at 35 °C for the first time. The reaction efficiency (RE) of starch esterification and the degree of substitution (DS) of granular OSA-maize starches prepared in a mixture of IL/water of 2:8 (w/w) were increased significantly by 35.3 and 35.6%, respectively. The pasting, textural, and emulsion properties of the OSA-starches were improved greatly. Our results showed that both the DS and the structural changes of starch following esterification determined the functional properties of OSA-starches and that OSA-potato starches presented different functional properties compared with OSA-maize starches. Compared with other mass ratios of IL/water mixtures, the optimum RE and DS for both maize and potato starches were obtained with a 2:8 (w/w) IL/water mixture. The method developed in the present study provides a green and sustainable strategy for starch-OSA modification due to its improved reaction efficiency, reduced usage of IL, and retention of the granular morphology of the derivatized starches.

中文翻译：

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颗粒淀粉的辛烯基琥珀酸酐酯的新型绿色合成

粒状淀粉辛烯基琥珀酸酐（OSA）酯最常在水性介质中制备，导致反应效率低和取代度低。在这项研究中，首次在35°C的离子液体水溶液中合成了带有OSA的玉米和马铃薯淀粉酯颗粒。在2：8（w / w）的IL /水混合物中制备的淀粉酯化反应效率（RE）和OSA玉米颗粒淀粉的取代度（DS）分别显着提高了35.3和35.6％ 。OSA淀粉的糊化，质地和乳化性能得到了很大的改善。我们的结果表明，酯化后DS和淀粉的结构变化决定了OSA淀粉的功能特性，并且OSA马铃薯淀粉与OSA玉米淀粉相比具有不同的功能特性。与其他质量比的IL /水混合物相比，使用2：8（w / w）IL /水混合物可以获得玉米和马铃薯淀粉的最佳RE和DS。本研究中开发的方法由于其提高的反应效率，减少的IL用量以及保留了衍生淀粉的颗粒形态，为淀粉OSA改性提供了一种绿色且可持续的策略。