为什么竹薄壁细胞显示出比纤维更高的纳米原纤化效率：对其分层细胞壁结构的研究,Biomacromolecules

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为什么竹薄壁细胞显示出比纤维更高的纳米原纤化效率：对其分层细胞壁结构的研究
Biomacromolecules ( IF 5.5 ) Pub Date : 2022-09-16 , DOI: 10.1021/acs.biomac.2c00224
Xuexia Zhang _{1,

2} , Fei Guo _{1,

2} , Zuofeng Yu _{1,

2} , Mengdan Cao ₃ , Hankun Wang ₃ , Rilong Yang _{1,

2} , Yan Yu _{1,

2,

3} , Lennart Salmén ₄

Affiliation

竹的薄壁细胞和纤维的细胞壁都高度木质化，并具有二次增厚作用。然而，通过超声处理和高压均质化两种方案，发现前者的纳米原纤化效率比纤维高得多。为了阐明其内在机制，对薄壁细胞和纤维的天然和预处理细胞壁进行了细胞壁聚合物的化学成分、细胞形态、细胞壁密度、孔结构和结构组织的详细比较。化学成分分析表明，与薄壁组织相比，纤维的纤维素含量高得多（49.8% 至 35.5%），但木聚糖含量较低（21.1% 至 36.2%），而木质素含量相似（24.9% 对 22.9%）。偏振 FTIR 进一步揭示了两种类型细胞之间聚合物结构组织的明显差异，纤维的所有聚合物比薄壁细胞的聚合物更有序地组装。高得多的细胞壁密度（1.52 对 1.28 g/cm3）也支持了纤维中聚合物的紧凑排列³ ) 和较低的孔隙率（化学预处理后 0.007 对 0.013 cc/g），与薄壁细胞相比。该研究提供的证据表明，与纤维相比，薄壁细胞中巨大的腔壁比、更高的细胞壁孔隙率和细胞壁基质聚合物（主要是木质素）排列较少的解剖学特征有助于它们实现更高的纳米原纤化效率。

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Why Do Bamboo Parenchyma Cells Show Higher Nanofibrillation Efficiency than Fibers: An Investigation on Their Hierarchical Cell Wall Structure

The cell walls of parenchyma cells and fibers in bamboo are both highly lignified with secondary thickening. However, the former were found to have much higher nanofibrillation efficiency than fibers via both protocols of ultrasonication and high pressure homogenization. To elucidate the inherent mechanism, detailed comparisons of chemical composition, cell morphology, cell wall density, pore structures, and structural organization of cell wall polymers were performed on native and pretreated cell walls of both parenchyma cells and fibers. Chemical compositional analysis showed that fibers have much higher cellulose (49.8% to 35.5%) but lower xylan content (21.1% to 36.2%) than parenchyma, while their lignin contents were similar (24.9% vs 22.9%). Polarized FTIR further revealed clear differences in the structural organization of polymers between the two types of cells, with all the polymers of fibers being more orderly assembled than those of parenchyma cells. The compact arrangement of polymers in the fibers was also supported by the much higher cell wall density (1.52 vs 1.28 g/cm³) and lower porosity (0.007 vs 0.013 cc/g after chemical pretreatments), as compared to the parenchyma cells. The study provides evidence that the anatomical characteristics of huge cavity-wall ratio, higher cell wall porosity, and less ordered arrangement of cell wall matrix polymers (mainly lignin) in parenchyma cells contribute to their higher nanofibrillation efficiency compared to fibers.

更新日期：2022-09-16

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