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Citation: DONG Yan-Ming, WANG Mian, WU Yu-Song. Determination of Degree of Substitution for Phthaloyl Chitosan by FTIR[J]. Chinese Journal of Applied Chemistry, ;2001, 18(4): 259-263. shu

Determination of Degree of Substitution for Phthaloyl Chitosan by FTIR

1.
Department of Materials Science and State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005

Received Date: 30 June 2000
Available Online: 8 January 2001
Fund Project: 国家自然科学基金(29974023) (29974023)福建省自然科学基金(Z9910006)资助项目 (Z9910006)

The FTIR spectrometry was used to determining the total degree of substitution (DS₁) of phthaloyl chitosans(PHCS) and degree of substitution of phthaloyl imide groups(DS₂). The probe bands, reference bands and baselines in IR spectra were investigated for the determination. The DS_s were also determined by ¹H NMR and elemental analysis for comparison. Based on the average relative deviations of (A_{probe band}/A_{ref band}) to DS in FTIR spectra the most suitable A_PB/A_RB) was found to be A_1712BL1/A_1391BL3 for DS₁ calculation, and A_1775BL1/A_1654BL1 for DS₂, where BL₁, BL₂ and BL₃ are the baselines in IR spectra(Fig.1).
- chitosan,
- phthaloyl chitosan,
- degree of substitution,
- quantitative determination,
- FTIR
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