Gallic Acid-Dextran Conjugate: Green Synthesis of a Novel Antioxidant Molecule
A novel derivative of dextran, dextran−gallic acid (Dex−Gal), obtained from simple conjugation with gallic acid, was synthesized by an efficient free radical-mediated method. To verify the synthesis of Dex−Gal, 1H-nuclear magnetic resonance (1H-NMR), Fourier transform i...
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| Main Authors: | , , , , |
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| Format: | Book |
| Published: |
MDPI AG,
2019-10-01T00:00:00Z.
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| Online Access: | Connect to this object online. |
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| Summary: | A novel derivative of dextran, dextran−gallic acid (Dex−Gal), obtained from simple conjugation with gallic acid, was synthesized by an efficient free radical-mediated method. To verify the synthesis of Dex−Gal, 1H-nuclear magnetic resonance (1H-NMR), Fourier transform infrared (FTIR) spectrometry, and high-performance size-exclusion chromatography (HPSEC) were employed. The results revealed the conjugation of gallic acid with the 15.5 kDa dextran from <i>Leuconostoc mesenteroides</i>. Dex−Gal had a molecular weight of 11.2 kDa, indicating that the conjugation reaction was accompanied by a minor degradation of Dex−Gal. In addition, Dex−Gal contained 36.8 ± 1.4 mg gallic acid per gram dextran. These molecules were also evaluated as antioxidants using total antioxidant capacity (TAC), reducing power, ferric chelation, and superoxide radical-scavenging assays. Both polysaccharides had no ferric chelation activity. In addition, Dex−Gal was more efficient as an antioxidant agent in TAC (13 times) and was more efficient than dextran in superoxide radical-scavenging (60 times) and reducing power (90 times) assays. These data demonstrate that Dex−Gal is a natural-compound-based antioxidant with potential applications in the pharmaceutical, cosmetic, and food industries. |
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| Item Description: | 2076-3921 10.3390/antiox8100478 |