Extraction and Structural Characterization of Celluloses and Hemicelluloses from Pineapple Peels
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Abstract:
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 ℃.
