Division of Bioresource, Paper and Coatings Technology, School of Industrial Technology, Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia.
Division of Bioresource, Paper and Coatings Technology, School of Industrial Technology, Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia.
Carbohydr Polym. 2015 Dec 10;134:534-40. doi: 10.1016/j.carbpol.2015.08.017. Epub 2015 Aug 13.
In this study cellulose nanocrystals were isolated through acid hydrolysis process from parenchyma and vascular bundle of oil palm trunk (Elaeis guineensis). The morphological properties of obtained cellulose nanocrystals were studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The microscopy images showed smoother and cleaner surface of parenchyma cellulose nanocrystals when compared to vascular bundle cellulose nanocrystals. The TEM image shows a higher length and diameter for parenchyma cellulose nanocrystals compared to vascular bundle cellulose nanocrystals. The Fourier transform infrared (FTIR) spectra showed changes in functional groups after acid hydrolysis due to removal of lignin, hemicelluloses and other impurities in both type of cellulose nanocrystals. Crystallinity index of cellulose nanocrystals was observed higher for vascular bundle as compared to parenchyma. Thermogravimetric analysis (TGA) was performed to study the thermal stability of cellulose nanocrystals and it was observed higher for parenchyma cellulose nanocrystals compared to vascular bundle.
在这项研究中，通过酸水解工艺从油棕树干的薄壁组织和维管束中分离出纳米纤维素晶体。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）研究了所得到的纳米纤维素晶体的形态特性。显微镜图像显示，与维管束纳米纤维素晶体相比，薄壁组织纳米纤维素晶体的表面更光滑、更干净。TEM 图像显示，与维管束纳米纤维素晶体相比，薄壁组织纳米纤维素晶体的长度和直径更高。傅里叶变换红外（FTIR）光谱显示，由于去除了两种类型的纳米纤维素晶体中的木质素、半纤维素和其他杂质，酸水解后功能基团发生了变化。与薄壁组织相比，纳米纤维素晶体的结晶度指数更高。通过热重分析（TGA）研究了纳米纤维素晶体的热稳定性，结果表明，薄壁组织纳米纤维素晶体的热稳定性更高。
