本文利用碱性过氧化处理，分离提取菠萝皮渣中纤维素和半纤维素组分，得到4个不同纤维素组分（C0、C1、C2、C3）和4个半纤维素组分（H1、H2、H3、H4）。利用红外光谱、离子色谱、热重分析、差示扫描量热分析对这些组分的结构进行表征。结果表明：纤维素提取过程中，碱性过氧化处理能有效去除原料纤维中的半纤维素和木质素，离子色谱分析显示纤维素C3组分的葡萄糖含量达93%以上，较C0、C1、C2有大幅度提升，纯度显著提高；热稳性分析表明纤维素C3在335.8 ℃左右热解速率达到最大，在128.8 ℃处有一个的熔融放热峰。不同浓度碱液分步抽提半纤维样品总得率为15.61%，且4个半纤维素样品结构相似；离子色谱分析表明菠萝皮渣中的半纤维素由木糖、阿拉伯糖、半乳糖和葡萄糖组成；热稳定性分析表明半纤维H3在285.2 ℃时热解速率达到最大，在124.5 ℃处出现很强的熔融放热峰。

Celluloses and hemicelluloses were isolated and extracted from pineapple peels by alkaline peroxide treatment, and four different kinds of cellulose fractions (C0, C1, C2, and C3) and four kinds of hemicellulose fractions (H1, H2, H3, and H4) were obtained. The structures of cellulose and hemicellulose were characterized by ion chromatography (IC), Fourier transform infrared spectroscopy (FTIR), thermogravimetric (TG) analysis, and differential scanning calorimetry (DSC). The results showed that hemicellulose and lignin could be effectively removed by alkaline peroxide treatment. IC analysis indicated that the glucose content of cellulose fraction C3 was above 93%, showing a significantly higher purity than those of C0, C1, and C2. TG and DSC analysis showed that cellulose fraction C3 had a maximum decomposition rate at 335.8 ℃ and a melting exothermic peak at 128.8 ℃. The total yield of four hemicellulose fractions was about 15.61%, and the four hemicellulose samples had similar structures. IC analysis indicated that the hemicelluloses in pineapple peels were composed of arabinose, glucose, galactose, and xylose. TG and DSC showed that hemicellulose H3 had a maximum pyrolysis rate at 285.2 ℃ and a strong melting exothermic peak at 124.5 ℃.

国家自然科学基金项目（31271978）；教育部博士点基金项目（20120172110017）