AI Article Synopsis
- Carboxymethylated (1 → 6)-α-dextran (CM-dex) was created by adding carboxymethyl groups at varying degrees of substitution (DS), resulting in products with DS values ranging from 0.57 to 1.25.
- The product with a DS of 1.13 (dex3-1) exhibited a significantly higher glass transition temperature (215.96 °C) compared to pure dextran (149.83 °C).
- CM-dex demonstrated improved scavenging activity against hydroxyl radicals, but less effectiveness against DPPH radicals than pure dextran, indicating its potential for wider applications in modified dextran.
Article Abstract
The carboxymethylated (1 → 6)-α-dextran (CM-dex) was synthesized by introducing carboxymethyl groups at different degrees of substitution (DS). The resulting dex1-1, dex2-1, dex3-1, and dex4-1 products had degrees of substitution of 0.57, 0.78, 1.13, and 1.25, respectively. The dex3-1 showed the highest glass transition temperature (T) of 215.96 °C, whereas T of pure dextran was 149.83 °C. TGA results indicated that the residual loss was reduced along with the increase of DS in the high-temperature region (450-600 °C). Besides, the CM-dex had stronger scavenging capacity against OH radicals but lower scavenging capacity for DPPH (1,1-diphenyl-2-picrylhydrazyl) radicals compared to that of pure dextran. The carboxymethylation of (1 → 6)-α-dextran will extend the applications for modified dextran.
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| http://dx.doi.org/10.1016/j.ijbiomac.2020.11.114 | DOI Listing |
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