纳滤
分馏
化学
水解物
制浆造纸工业
色谱法
膜
工程类
有机化学
生物化学
水解
作者
Gloria Lizeth Díaz-Arenas,Huy Quoc Hoang,Hans Estrella Cainglet,Muhammad Sadiq,Gil Garnier,Joanne Tanner
摘要
Xylooligosaccharides (XOS) are oligomers constituted of 2 to 10 xylose units derived from xylan-rich lignocellulosic biomass. These oligomers possess significant value in biotechnological and functional food applications, which are determined by their degree of polymerization (DP), and the type and number of substituents. Separation of XOS is industry-specific, and it presents a formidable challenge for large-scale production due to their complexity and similarity. This study investigated the use of nanofiltration membranes to fractionate beechwood-xylan hydrolysates containing XOS. Tubular ceramic membranes with molecular weight cut-offs (MWCO) of 750, 450 and 200 Da were able to separate XOS into three distinct DP ranges namely, high (X2-X5), medium (X2-X4) and low (X2-X3), respectively. The impacts of operating pressure and pH were evaluated to select the conditions leading to high permeate flux while maintaining high rejection of X6, X5 and X4 for the 750, 450 and 200 Da membranes, respectively. The trade-off between XOS rejection and flux was favored at pH 7.0 for the 750 and 450 Da membranes, pH 4.2 for the 200 Da, and operating pressure of 10 bar for the three membranes. These results demonstrate the feasibility of nanofiltration for large-scale separation of XOS with specific properties.
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