中度醋酸乙烯酯乙酰化可改善氧化玉米淀粉的糊化性能,Starch

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中度醋酸乙烯酯乙酰化可改善氧化玉米淀粉的糊化性能
Starch ( IF 2.6 ) Pub Date : 2020-09-26 , DOI: 10.1002/star.202000079
Lei Ma _{1,

2} , Feiyang Xiong _{1,

3} , Haocun Kong ₁ , Zhengbiao Gu _{1,

4,

5} , Zhaofeng Li _{1,

4,

5} , Yan Hong _{1,

4,

5} , Li Cheng _{1,

4,

5} , Caiming Li _{1,

4,

5}

Affiliation

通常认为乙酰化可以增强淀粉的亲水性，导致粘度增加。但是，有趣的是，在该研究中发现适度的乙酸乙烯酯乙酰化可降低糊化过程中氧化淀粉的峰值粘度。淀粉糊的这种低粘度在纸表面施胶和纺织品施胶中是非常需要的。玉米淀粉被NaClO（4.0％氯）氧化，然后使用乙酸乙烯酯以不同含量乙酰化。醋酸乙烯酯改性的氧化淀粉的峰值粘度降低了67.1％。傅里叶变换红外光谱法证实了乙酰基的存在，其峰值在1730 cm ^-1处。X射线衍射分析表明，与氧化或乙酰化淀粉相比，氧化-乙酰化淀粉的结晶峰强度降低。颗粒形态的观察进一步揭示了中等程度的乙酰化导致的颗粒的广泛表面损伤。分子大小分布分析还表明，适度的乙烯基乙酰化可以显着降低（≈60％）氧化淀粉的平均分子量。这些结果表明适度的乙酰化可以改变氧化淀粉的结构和形态特性，导致糊状粘度显着降低，并在淀粉工业中显示出巨大的应用潜力。

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Moderate Vinyl Acetate Acetylation Improves the Pasting Properties of Oxidized Corn Starch

It is generally believed that acetylation can enhance the hydrophilicity of starch, resulting in increased viscosity. However, moderate vinyl acetate acetylation is interestingly found to decrease the peak viscosity of oxidized starch during pasting in this study. This low viscosity of starch paste is extremely desirable in paper surface sizing and textile sizing. Corn starches are oxidized by NaClO (4.0% chlorine) and then acetylated using vinyl acetate at different levels. The peak viscosity of oxidized starch modified by vinyl acetate is reduced by 67.1%. Fourier transform infrared spectroscopy confirms the presence of acetyl groups with a peak at 1730 cm⁻¹. X‐ray diffraction analysis shows that the intensity of crystalline peaks of oxidized–acetylated starches is decreased compared with that of oxidized or acetylated starch. Granule morphology observations further reveal extensive surface damage of the granules resulting from moderate acetylation. Molecular size distribution analysis also shows that the moderate vinyl acetylation can significantly reduce (≈60%) the average molecular weight of oxidized starch. These results show that moderate acetylation can change the structural and morphological properties of oxidized starch, leading to a considerable drop in paste viscosity and shows great application potential in the starch industry.

更新日期：2020-09-26

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