Fashi Armin, Fallah Delavar Ali, Zamani Abbasali, Noshiranzadeh Nader
Environmental Science Research Laboratory, Department of Environmental Science, Faculty of Science, University of Zanjan, Postal Code 45371-38791, Zanjan, Iran; Research and Development Department, Glucosan Company, Alborz Industrial City, Qazvin, Iran.
Research and Development Department, Glucosan Company, Alborz Industrial City, Qazvin, Iran.
Food Chem. 2023 Jun 1;410:135439. doi: 10.1016/j.foodchem.2023.135439. Epub 2023 Jan 11.
For the first time, the current work applied fungal α-amylase treated corn starch in granular form to produce solid state malate-esterified starch (MES). The pores and channels created on the granules after the enzymatic modification could provide more possibilities for malic acid to esterify the starch, resulting in the increase of substitution degree (0.084) and reaction efficiency (86.6%) compared to NS. Based on the obtained results, the dual treatment significantly increased solubility, amylose content, and syneresis, but reduced transparency, viscosity, digestibility rate, and swelling power compared to those of NS. The occurrence of esterification onto starch chains was confirmed by FT-IR at 1720 cm. Other techniques including SEM, XRD, and DSC were employed to examine changes in the structure of starch granules after applying each treatment. Also, the greenness of the combined modification (score: 77) was proved by using a new methodology named Eco-Scale.
本研究首次将颗粒状真菌α-淀粉酶处理的玉米淀粉应用于固态苹果酸酯化淀粉（MES）的制备。酶促改性后颗粒上形成的孔隙和通道为苹果酸酯化淀粉提供了更多可能性，与未处理淀粉（NS）相比，取代度提高到0.084，反应效率提高到86.6%。基于所得结果，与NS相比，双重处理显著提高了溶解度、直链淀粉含量和脱水收缩率，但降低了透明度、粘度、消化率和膨胀力。在1720 cm处通过傅里叶变换红外光谱（FT-IR）证实了淀粉链上发生了酯化反应。采用扫描电子显微镜（SEM）、X射线衍射（XRD）和差示扫描量热法（DSC）等其他技术研究了各处理后淀粉颗粒结构的变化。此外，通过一种名为生态尺度的新方法证明了复合改性的绿色度（分数：77）。
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