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Porous Starch-Based Material Prepared by Bioextrusion in the Presence of Zinc and Amylase–Magnesium Complex
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-07-17 00:00:00 , DOI: 10.1021/acssuschemeng.8b02128
Enbo Xu 1, 2 , Zhengzong Wu 3 , Jie Long 1 , Aiquan Jiao 1 , Zhengyu Jin 1
Affiliation  

A simple and sustainable preparation route for the creation of macropores in extruded starch was developed. Zinc ions were exogenously added into native corn starch, and then the Zn-modified starch was mixed with an enzyme (thermostable α-amylase)–magnesium complex as the biocatalyst prior to extrusion. The porous bioextrudates were characterized using SEM, XRD, FT-IR and water/oil absorption analyses. Results showed that the average pore numbers were increased (97 to 201 in the 160× SEM images), whereas the pore sizes (∼10–20 μm) were almost unchanged with the amylase concentration increased from 0.04 to 0.12%. The crystallinities of the porous extrudates were decreased to 7.9–10.2% compared to that of the native counterpart (21.1%), but their structures all exhibited traces of rigidification. Furthermore, the water absorption capacities were greatly increased (∼450–500%) while the oil absorption capacities were slightly increased (∼40%). Overall, it extends the preparation and the potential application of porous starch in the field of materials.

中文翻译:

锌和淀粉酶-镁复合物存在下生物挤压制备的多孔淀粉基材料

开发了一种简单且可持续的制备方法,用于在挤出淀粉中形成大孔。将锌离子外源添加到天然玉米淀粉中,然后将锌修饰的淀粉与酶(耐高温α-淀粉酶)-镁络合物作为生物催化剂混合,然后再进行挤出。使用SEM,XRD,FT-IR和吸水/吸油分析对多孔生物挤出物进行表征。结果表明,平均孔径增加(在160x SEM图像中从97增加到201),而孔径(〜10–20μm)几乎没有变化,而淀粉酶浓度从0.04%增加到0.12%。与天然挤出物(21.1%)相比,多孔挤出物的结晶度降低至7.9-10.2%,但它们的结构均显示出硬化痕迹。此外,吸水能力大大提高(〜450–500%),而吸油能力则略有提高(〜40%)。总体而言,它扩展了多孔淀粉在材料领域的制备和潜在应用。
更新日期:2018-07-17
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