An infrared investigation in relation with chitin and chitosan characterization

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• 作者：Brugnerotto ; J. ; Lizardi ; J. ; Goycoolea ; F.M. ; Argü ; elles-Monal ; W. ; Desbriè ; res ; J. ; et. al.
• 关键词：Chitin ; Chitosan ; Degree of acetylation
• 刊名：Polymer
• 出版年：2001
• 期刊代码：83_00323861
• 类别：ms
• 出版时间：April, 2001
• 卷：42
• 期：8
• 页码：3569-3580
• 文件大小：210 K

摘要

The use of infrared spectroscopy for characterization of the composition of chitin and chitosan covering the entire range of degree of acetylation (DA) and a wide variety of raw materials is examined further. The ratio of absorbance bands selected was calibrated using ¹H liquid and ¹³C CP-MAS solid-state NMR as absolute techniques. IR spectra of the structural units of these polymers validated the choice of baselines and characteristic bands. The bands at 1650 and 1320cm⁻¹ were chosen to measure the DA. As internal reference, the intensities at 3450 and 1420cm⁻¹ were evaluated. The absorption band ratios involving the reference at 3450cm⁻¹ had poorer fit.. The absorption ratio A₁₃₂₀/A₁₄₂₀ shows superior agreement between the absolute and estimated DA-values (DA%=31.92A₁₃₂₀/A₁₄₂₀−12.20; r=0.990).