Opportunities for Ivory Nut Residue Valorization as a Source of Nanocellulose Colloidal Suspensions

纳米纤维素 纤维素 木质素 材料科学 酸水解 化学工程 水解 溶解 化学 有机化学 工程类
作者
Enrique Javier Carvajal Barriga,Jean‐Luc Putaux,Pablo Martín‐Ramos,Jennifer Simbaña,Patricia Portero Barahona,Jesús Martín‐Gil
出处
期刊:Gels [Multidisciplinary Digital Publishing Institute]
卷期号:9 (1): 32-32 被引量:4
标识
DOI:10.3390/gels9010032
摘要

Ivory nut seeds have been traditionally exploited in Central and South America for obtaining vegetable ivory. The residues from this industry are susceptible to valorization as a source of fatty acids (by organic extraction) and mannans (by alkaline dissolution and regeneration). Nonetheless, cellulose may also be recovered at the end of this fractionation process by acid hydrolysis and functionalization, with associated advantages over other lignocellulosic sources due to the absence of lignin in the endospermic tissue. In this work, various experimental parameters (sulfuric acid concentration, temperature, and hydrolysis time) were investigated to optimize the processing conditions for preparing stable nanocellulose suspensions after ultrasonication. The most stable nanocellulose gel (1 wt% solid content) was obtained after 4-h hydrolysis at 60 °C with 8 M H2SO4 and was characterized by using complementary tech-niques, including dynamic light scattering (DLS), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), nano-fibril sulfation measurements, vibrational and solid-state nuclear magnetic resonance (CP/MAS 13C-NMR) spectroscopies, and thermal analysis. This nanocellulose hydrogel is susceptible to further utilization in various applications and fields, e.g., in agricul-ture for controlling the release of agrochemicals, in pharmaceutics for developing new dosage forms, and in the treatment of wastewater from the textile and paper industries.
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