Stomatology ›› 2023, Vol. 43 ›› Issue (4): 301-307.doi: 10.13591/j.cnki.kqyx.2023.04.003

• Basic Research • Previous Articles     Next Articles

Study on properties of PAAc-NHS ester/gelatin composite oral patches

DUN Zhiyue1,SUN Chuanyue2,ZHANG Zhihao1,SHU Fei1,ZHANG Qinghong2,LIU Mei1()   

  1. Department of Prosthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing 210029, China
  • Revised:2023-01-09 Online:2023-04-28 Published:2023-05-08
  • Contact: LIU Mei E-mail:liumei2017@njmu.edu.cn

Abstract:

Objective To compare the effects of different levels of poly(acrylic acid)grafted with N-hydrosuccinimide ester(PAAc-NHS ester)on the mechanical properties and in vitro adhesion properties of PAAc-NHS ester/gelatin composite hydrogels. Methods The PAAc-NHS ester/gelatin composite hydrogels were constructed via ultraviolet cross-linking method and divided into three groups by mass fraction of PAAc-NHS ester:A(10%), B(20%)and C(30%). Scanning electron microscopy(SEM) was used to observe the surface morphology of the composite hydrogels, and Fourier infrared spectroscopy(FT-IR)was used to detect the surface characteristic functional groups of PAAc-NHS ester/gelatin composite hydrogels; mechanical properties of hydrogel were tested by tensile test; the swelling ratio and water retention ratio of the composite hydrogels were calculated and the adhesive properties and cytotoxicity of hydrogels were evaluated. Results SEM results showed that PAAc-NHS ester/gelatin composite hydrogel had porous microstructure, and the pore size decreased with the increase of PAAc-NHS ester content; the FT-IR results showed that PAAc-NHS ester was cross-linked with gelatin in all groups; the tensile results revealed that Group C had the strongest mechanical properties (tensile stress was (140.15±45.24) kPa; elongation at break was (310.19±11.43)%); the swelling and water retention test results showed that group A had the highest water absorption and water retention rates; in vitro adhesion experiments showed that all three groups of PAAc-NHS ester/gelatin composite hydrogels had good adhesion properties in vitro and showed no cytotoxicity. Conclusion All the groups of PAAc-NHS ester/gelatin composite hydrogels have good mechanical properties and adhesion in vitro, and have no cytotoxicity. Therefore, they have the potential to be applied as oral patches.

Key words: hydrogel, polyacrylic acid, oral patch, wound dressings

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