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Lee, Dong Woog
Interfacial Physics and Chemistry Laboratory
Research Interests
  • Bio/Bio-inspired adhesion and lubrication, friction of skin and sensory perception, wetting behavior of various surfaces, surface physics and chemistry of low-dimensional materials

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Intermolecular interactions of chitosan: Degree of acetylation and molecular weight

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Title
Intermolecular interactions of chitosan: Degree of acetylation and molecular weight
Author
Lim, ChanoongHwang, Dong SooLee, Dong Woog
Issue Date
2021-05
Publisher
ELSEVIER SCI LTD
Citation
CARBOHYDRATE POLYMERS, v.259, pp.117782
Abstract
The degree of acetylation (DA), which determines as the molar proportion of N-acetyl-D-glucosamine units on chitosan, characterizes the physical, chemical, and biological properties of chitosan. Thus, DA can be a critical factor in the utilization of chitosan. Nevertheless, quantitative studies on the molecular interactions of chitosan as a function of DA are lacking. Here, we directly measured the molecular interaction (adhesion and cohesion) of molecularly thin chitosan films, dependent on the molecular weight and DA, using a surface forces apparatus. Using low molecular weight (LMW,-5 kDa) and high molecular weight (HMW,-135 kDa) chitosan, we obtained several DA ranges through a reacetylation method. The interactions of LMW chitosan were greatly influenced by the intrinsic charge of the chitosan units, whereas for HMW chitosan, chain flexibility was found to be the major factor affecting molecular interaction Taken together, our comprehensive data provides a holistic understanding of the interaction mechanism of chitosan.
URI
https://scholarworks.unist.ac.kr/handle/201301/49977
URL
https://www.sciencedirect.com/science/article/pii/S0144861721001697?via%3Dihub
DOI
10.1016/j.carbpol.2021.117782
ISSN
0144-8617
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ECHE_Journal Papers
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