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Chemcial Industry and Engineering 2021, Vol. 38 Issue (1) :61-68    DOI: 10.13353/j.issn.1004.9533.20200108
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Modification of Sodium Alginate/Chitosan Hydrogel Microspheres Cross-linked by Tannic Acid
Zhu Jingmin, Dang Leping, Wei Hongyuan
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

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Abstract Effects of the introduction of tannic acid on the properties of sodium alginate/chitosan hydrogels in microsphere and microencapsulation applications were investigated. First, alginate/chitosan hydrogel microspheres modified by tannic acid were prepared for further characterization. Fourier transform infrared spectra (FTIR) was used to analyze the possible interactions of the molecules in the blends, thermal gravimetric analyzer (TGA) was used to evaluate the thermal stability of microspheres, and the effects of the addition of tannic acid on the particle size, water content and swelling properties of the microspheres were studied. The results show that the presence of tannic acid improves the thermal stability of the microspheres and increases the particle size and improves the water content and swelling rate due to the crosslinking effect between tannic acid and sodium alginate/chitosan. Then the sodium alginate/chitosan hydrogel cross-linked with tannic acid was used to encapsulate peppermint oil. The result proves that microcapsules prepared with tannic acid cross-linked polymer had higher encapsulation rate and better thermal stability.
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Zhu Jingmin
Dang Leping
Wei Hongyuan
Keywordssodium alginate;   chitosan;   tannic acid;   microcapsules;   peppermint oil     
Received 2020-01-16;
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Zhu Jingmin, Dang Leping, Wei Hongyuan.Modification of Sodium Alginate/Chitosan Hydrogel Microspheres Cross-linked by Tannic Acid[J]  Chemcial Industry and Engineering, 2021,V38(1): 61-68
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