Dolphin (PG) College of Science & Agriculture, Punjabi University, Patiala, Punjab, India.
Department of Chemical Engineering, DCR University of Science & Technology, Murthal, Sonipat, Haryana, India.
Carbohydr Polym. 2020 Apr 15;234:115827. doi: 10.1016/j.carbpol.2020.115827. Epub 2020 Jan 24.
Waste biomass of two major milk weeds was separately given combination of chemical-mechanical treatments in order to expose natural cellulosic micro and nano-fibrillated structures (MFCs and NFCs). Compositional and FTIR analysis were initially used to confirm the removal of impurities. WA-XRD and FESEM analysis of MFCs further revealed presence of highly crystalline, fine-shaped materials that resemble carbonaceous structures. HR-TEM analysis further exposed morphology of the two nanofibrils possessing a well entangled network (diameter ≤80 nm) comprising coil shaped fine spots of size up to 80 nm-220 nm. Morphology even got clearer when STEM and EDX mapping of the NFCs assured that observed fine-spots are integral and possibly due to certain biosynthetic process. Presence of calcium elements in two types of NFCs provided important evidence of exposure of nanocellulose-xyloglucan-pectin configuration responsible for coil-shaped fine-spots resembling "biomechanical hot spots".
两种主要乳草的废弃生物质分别进行了化学-机械组合处理，以暴露天然的纤维素微纳纤维结构（MFCs 和 NFCs）。成分和 FTIR 分析最初用于确认杂质的去除。MFCs 的 WA-XRD 和 FESEM 分析进一步表明存在高度结晶的、类似碳纤维的精细形状材料。高分辨率 TEM 分析进一步揭示了两种纳米纤维的形态，它们具有良好缠结的网络（直径≤80nm），由直径达 80nm-220nm 的螺旋状细点组成。当 NFCs 的 STEM 和 EDX 映射确保观察到的细点是完整的并且可能是由于某种生物合成过程时，形态甚至变得更加清晰。两种类型的 NFCs 中钙元素的存在为暴露纳米纤维素-木葡聚糖-果胶结构提供了重要证据，这种结构负责形成类似“生物力学热点”的螺旋形细点。
