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      Researches on the Internal Molecular Weight Uniformity of Chitosan Biomaterials

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          Uniform molecular weight (Mw) chitosan (CS) is highly demanded in medical biomaterial industry. This present article described heterogeneous degradation of CS in aqueous HCl/ethanol solution, in which progress uniform Mw CS was successfully prepared. The Mw distribution of CS was measured by gel permeation chromatography (GPC) analysis. Moreover, the structure and properties of degraded CS were characterized by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy ( 1H NMR), X-ray diffraction (XRD) and thermogravimetric (TG) analysis. In addition, the biocompatibility of degraded CS was also assessed by hemolysis rate (HR) measurement. The Mw of CS dramatically decreased from 246 KDa to 76 kDa at the initial 30 min, and stabilized at 18 kDa after 24 h. GPC analysis results showed that the degraded CS molecular become homogenization. FT-IR and 1H NMR analysis confirmed the basic structure of CS molecular backbone was not destroyed during this progress. Besides, the water solubility of CS was not significantly influenced by this reaction. Moreover, the XRD analysis revealed that crystallinity of degraded CS increased from 70.32% to 99.25% with time. The TG analysis showed improved thermal stability of degraded CS. HR measurement demonstrated the degraded CS possessed excellent biocompatibility. This simple and efficient heterogeneous degradation would open up a new route to produce uniform Mw CS.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          24 January 2020
          01 April 2020
          : 19
          : 2
          : 459-465
          1College of Marine Life Science, Ocean University of China, Qingdao 266100, China
          2Zoological Institute, Department of Molecular Physiology, Kiel University, Kiel 24118, Germany
          Author notes
          *Corresponding author: CHEN Xiguang, E-mail: xgchen@

          # The two authors contributed equally to this work.

          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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