Citation:
WANG Xue, CHENG Xiao-Min. Study on Aggregation Behavior of Hydroxypropyl Chitosan in Aqueous Solution[J]. Chinese Journal of Analytical Chemistry,
;2015, 43(12): 1864-1869.
doi:
10.11895/j.issn.0253-3820.150416
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Hydroxypropyl chitosan(HPCS) with various degrees of deacetylation(DD 98%-55%) was successfully prepared by the reaction of pre-basified N-acetylchitosan and propylene epoxide with ispropanol as solvent. The acetylations of chitosan at N-position were carried out by changing the dosage of acetic anhydride in acetic acid-water-methanol solution. The hydroxypropyl substitution mainly occurred at both C3-OH and C6-OH groups, which was approved by FTIR and 1H-NMR. The aggregation behavior of HPCS samples was carefully investigated by gel permeation chromatography with multi-angle light scattering(GPC-MALS), dynamic light scattering(DLS), fluorescence spectrometry and atomic force microscope(AFM). The results indicated that HPCS single chains and aggregates were coexistence in aqueous solution. With the increasing content of N-acetyl of HPCS, the apparent aggregation number increased. The critical aggregation concentration(CAC) from DLS were 1.09 mg/mL for HPCS with DD 98% and 1.67 mg/mL for HPCS with DD 75%, which were consistent with the results of pyrene probe fluoresce spectrometry. The content of N-acetyl groups had an effect on the CAC values. Two types of HPCS(DD 55%) aggregates occurred in aqueous solution. The majority was smaller aggregates with lower than 13 nm in height after film pilling and 70-200 nm in length, while the minority(about 20%) was comparatively larger aggregates with about 13-31.4 nm in height after film pilling and 200-610 nm in length.
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