Abstract Bacterial nanocellulose (BNC) is synthetized as hydrated sheets difficult to mix or store and commercialize. Therefore, to incorporate in food matrices, BNC should be previously processed to obtain powders easily resuspended, which are able to impart structure and stability. This work evaluated the viscoelastic and structural behavior of rehydrated BNC suspensions (1%) obtained from different post-synthetic treatments (ground, acid hydrolysis, ultrasound), compared with their respective suspensions before freeze-drying. Suspensions showed strong-gel behavior before and after rehydration but with a marked decrease in viscoelastic moduli of the latter (grounded: around 10 times; hydrolyzed: more than 102 times). X-ray, FTIR, scanning electron microscopy, and light scattering were also applied. Hydrolysis produced an increase in powders crystallinity (from 71% to 89%), and ultrasound a BNC fibers bonding (average particle size increased: 8%); those modifications could hinder water migration into the porous BNC structure and explain the final rheological behavior.

中文翻译：

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细菌纳米纤维素合成后处理对粉末和再水化悬浮液特性的影响

摘要 细菌纳米纤维素 (BNC) 被合成为难以混合或储存和商业化的水合片。因此，为了掺入食品基质中，BNC 应预先处理以获得易于重新悬浮的粉末，这能够赋予结构和稳定性。这项工作评估了从不同的合成后处理（研磨、酸水解、超声）获得的再水化 BNC 悬浮液 (1%) 的粘弹性和结构行为，与它们各自的冷冻干燥前悬浮液相比。悬浮液在再水化前后表现出强凝胶行为，但后者的粘弹性模量显着降低（接地：约 10 倍；水解：超过 102 倍）。还应用了 X 射线、FTIR、扫描电子显微镜和光散射。水解使粉末结晶度增加（从 71% 增加到 89%），并超声 BNC 纤维粘合（平均粒径增加：8%）；这些修饰可能会阻碍水迁移到多孔 BNC 结构中并解释最终的流变行为。