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Multiple Ethanolic‐Precipitation: An Approach to the Separation of Dextrin Fractions with Narrow Molecular Weight Distributions from Acid‐Hydrolyzed Waxy Corn Starch
Starch ( IF 2.6 ) Pub Date : 2020-05-24 , DOI: 10.1002/star.202000038
Xuechen Zhuang 1 , Shufen Zhang 1 , Heping Li 2
Affiliation  

Dextrin is widely used in the food, biomedical, and cosmetic industries. In this work, a new ethanolic fractionation method, the multiple ethanolic‐precipitation (MEP), is established to fractionate the acid‐hydrolyzed waxy corn starch (AHWCS) that consists of a high concentration of low‐molecular‐weight dextrin. Through these multiple precipitation processes, the effect of the dextrin concentration on fractionation is weakened, which makes the fractionation only dependant on the molecular weight of dextrin. Five dextrin fractions (P1, P2, P3, P4, and P5) with narrow molecular weight distributions are obtained. The weight‐average molar mass (Mw) and the molecular weight dispersity ( D ¯ ) of five fractions are 7.3 × 104 g mol−1 (2.0), 2.3 × 104 g mol−1 (2.1), 1.6 × 104 g mol−1 (2.2), 8.9 × 103 g mol−1 (2.1), and 4.5 × 103 g mol−1 (3.3), respectively. Additionally, the increase of molecular weight tends to decrease the moisture‐absorption but increase the viscosity and thermal stability, which can provide a basis for the application of different molecular weight dextrin fractions in different fields. These results suggest that the MEP method is a low cost and efficient approach for directly separating dextrin fractions with narrow molecular weight distributions from the AHWCS.

中文翻译:

多次乙醇沉淀:从酸水解蜡状玉米淀粉中分离分子量分布较窄的糊精馏分的方法

糊精广泛用于食品,生物医学和化妆品工业。在这项工作中,建立了一种新的乙醇分馏方法,即多重乙醇沉淀法(MEP),以分馏由高浓度的低分子量糊精组成的酸水解蜡质玉米淀粉(AHWCS)。通过这些多次沉淀过程,糊精浓度对分馏的影响减弱,这使得分馏仅取决于糊精的分子量。获得具有窄分子量分布的五个糊精级分(P 1,P 2,P 3,P 4和P 5)。重均摩尔质量(M w)和分子量分散度( d ¯ )的五个分数分别为7.3×10 4  g mol -1(2.0),2.3×10 4  g mol -1(2.1),1.6×10 4  g mol -1(2.2),8.9×10 3  g mol -1(2.1 2.1)和4.5×10 3  g mol -1(3.3)。另外,分子量的增加往往会降低吸湿性,但会增加粘度和热稳定性,这可以为在不同领域中应用不同分子量的糊精组分提供基础。这些结果表明,MEP方法是一种直接从AHWCS中分离分子量分布窄的糊精组分的低成本高效方法。
更新日期:2020-05-24
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