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Insulin-loaded hydroxypropyl methyl cellulose-co-polyacrylamide-co-methacrylic acid hydrogels used as rectal suppositories to regulate the blood glucose of diabetic rats
- Shi, Yongli, Xue, Jintao, Sang, Yajun, Xu, Xiaoqing, Shang, Qing
- International journal of biological macromolecules 2019 v.121 pp. 1346-1353
- Fourier transform infrared spectroscopy, Raman spectroscopy, animal disease models, animal experimentation, blood glucose, cell viability, cytotoxicity, diabetes, glycemic effect, hydrogels, insulin, pH, photographs, polymerization, rats, scanning electron microscopes, scanning electron microscopy
- The purpose of this study was developing a novel hydroxypropyl methyl cellulose-co-polyacrylamide-co-methacrylic acid (HPMC-co-PAM-co-PMAA) hydrogel, which was used as rectal suppository to regulate the blood glucose of diabetes. HPMC-co-PAM-co-PMAA hydrogel was fabricated via free-radical polymerization. Fourier transform infrared spectroscopy (FTIR) and Raman spectra were used to confirm the fabrication of HPMC-co-PAM-co-PMAA hydrogel. Their inner morphology was observed with scanning electron microscope (SEM). The extracts of hydrogel were applied to study their cell viability. The hypoglycemic effects of insulin (INS)-loaded HPMC-co-PAM-co-PMAA hydrogels were investigated by rectal administration. FTIR and Raman spectra confirmed the obtaining of HPMC-co-PAM-co-PMAA hydrogels. Many micro-pores were found in the SEM photograph of HPMC-co-PAM-co-PMAA hydrogels. Cell experiments indicated that HPMC-co-PAM-co-PMAA hydrogel was out of cytotoxicity. In vitro release profiles showed that INS-loaded hydrogel could release INS at a continuous manner in pH 7.4 buffer (rectal conditions). Animal experiments suggested that INS-loaded hydrogel had an obvious hypoglycemic effect. Therefore, as a convenient and economic method of administration, INS-loaded HPMC-co-PAM-co-PMAA hydrogels could be used as rectal suppositories to regulate blood glucose.