This study aimed to examine and compare alkali treatment influences on the microstructure, chemical composition, and thermal properties of parenchyma cells and fibers in bamboo. The parenchyma cells and fibers were isolated mechanically from the same bamboo and were subsequently treated with sodium hydroxide (NaOH) at various concentrations (2, 5, 10, 15, and 25 %) for 2h followed by air-drying. The alkali-treated parenchyma cells and fibers were characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), chemical composition analysis, and thermogravimetric analysis (TGA). The results showed that the parenchyma cells collapsed and fibers separated when treated by NaOH with a concentration of greater than 10 %. The starch in parenchyma cells could be extracted as individualized granules by alkali solution, particularly at 2% NaOH. The alkali treatment could partly remove lignin from parenchyma cells but almost did not affect hemicellulose content. In comparison, both lignin and hemicellulose in fiber were removed after alkali treatment. Cellulose I was transformed to cellulose Ⅱ in parenchyma cell after treated by 15 % and 25 % NaOH solutions, while the transformation of cellulose I to cellulose II occurred in fibers only at a concentration of 25 %. Parenchyma cells had lower thermal stability than fibers. The alkali treatment influenced the parenchyma cells’ thermal stability more pronouncedly than that of fibers.

这项研究旨在检查和比较碱处理对竹子薄壁组织细胞和纤维的微观结构，化学成分和热学性质的影响。从同一个竹子中机械分离出薄壁组织细胞和纤维，然后用各种浓度（2％，5％，10％，15％和25％）的氢氧化钠（NaOH）处理2h，然后风干。碱处理的薄壁组织细胞和纤维通过扫描电子显微镜（SEM），傅立叶变换红外光谱（FTIR），化学成分分析和热重分析（TGA）进行表征。结果表明，当用浓度大于10％的NaOH处理时，实质细胞崩溃并且纤维分离。薄壁细胞中的淀粉可以通过碱溶液提取成单个颗粒，特别是2％的NaOH。碱处理可以部分去除薄壁细胞中的木质素，但几乎不影响半纤维素含量。相比之下，碱处理后去除了纤维中的木质素和半纤维素。纤维素I在15％和25％的NaOH溶液中处理后，在薄壁细胞中转化为纤维素Ⅱ，而纤维素I转化为纤维素II的浓度只有25％。薄壁细胞的热稳定性低于纤维。碱处理对实质细胞的热稳定性的影响比对纤维的影响更为显着。纤维素I在15％和25％的NaOH溶液中处理后，在薄壁细胞中转化为纤维素Ⅱ，而纤维素I转化为纤维素II的浓度只有25％。薄壁细胞的热稳定性低于纤维。碱处理对实质细胞的热稳定性的影响比对纤维的影响更为显着。纤维素I在15％和25％的NaOH溶液中处理后，在薄壁细胞中转化为纤维素Ⅱ，而纤维素I转化为纤维素II的浓度只有25％。薄壁细胞的热稳定性低于纤维。碱处理对实质细胞的热稳定性的影响比对纤维的影响更为显着。