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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
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
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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
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。
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