Optimizing Cellulose Extraction from Kenaf (Hibiscus Cannabinus L.) Fiber by Selective Retting and Hydrothermal Pretreatment

ABSTRACT

This study investigated the effects of hydrothermal pretreatment on the properties of water and enzyme retted kenaf (Hibiscus cannabinus L.) fibers after treatment in a high-pressure reactor at 160, 180, and 200°C for 40 min. The retted fibers were characterized by chemical analysis, field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The results showed that the cellulose content increased after the fibers were retted using water or enzymatic retting, the FE-SEM analysis found changes in the surface morphology of the treated fibers, and the results of the chemical analysis and FTIR showed that the amount of hemicellulose content decreased as the treatment temperature increased. In addition, the XRD results showed that the crystallinity of the treated-fibers and the extraction processing did not affect the crystalline structure of the cellulose, while the results of the TGA indicated that the thermal stability of the treated fibers was higher than that for untreated fibers. Finally, it was determined that the cellulose yield was the highest when the kenaf was pre-treated at 180°C.

摘要

该研究调查的影响水热预处理对水的特性和酶洋麻纤维（Hibiscus cannabinus L.）纤维在高压反应器处理后在160，180和200 °C 对40 分钟通过化学分析，场发射扫描电子显微镜（FE-SEM），傅里叶变换红外光谱（FTIR），X射线衍射（XRD）和热重分析（TGA）等手段进行了表征. 结果表明，纤维素含量增加了纤维受干扰的腐烂后使用水或酶浸水，场发射扫描电镜分析发现治疗纤维的表面形态的变化，和化学分析的结果和傅里叶变换红外光谱法显示，大量的半 纤维素含量转化处理温度的增加而减少. 此外，X射线衍射结果表明，处理过的纤维的结晶度和提取处理不会影响到纤维素的晶体结构，而热重量分析的结果表明，对纤维的热稳定性高于该处理的纤维. 最后，它是确定纤维素产量最高的洋麻纤维预处理时在180°C.

KEYWORDS:

• Hydrothermal treatment
• kenaf
• retting process

关键词:

• 热液治疗
• 洋麻
• 浸水过程

Acknowledgments

The authors are grateful to the Enzyme Technology Laboratory in the Microbial Biotechnology and Biochemicals Research Unit at the National Center for Genetic Engineering and Biotechnology (BIOTEC) in Thailand for providing laboratory equipment and instruments.

Disclosure statement

The authors declare no conflicts.

Additional information

Funding

This work was supported by the Kasetsart University Research and Development Institute (KURDI) and the Botany Section, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus.