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Characterization of insulin mucoadhesive buccal films: Spectroscopic analysis and in vivo evaluation

DOI: 10.3390/sym13010088 DOI Help

Authors: Maram Diab (University of Jordan; Al-Taqaddom Pharmaceutical Industries) , Al-sayed Sallam (Al-Taqaddom Pharmaceutical Industries) , Imad Hamdan (University of Jordan) , Randa Mansour (Philadelphia University) , Rohanah Hussain (Diamond Light Source) , Giuliano Siligardi (Diamond Light Source) , Nidal Qinna (Petra University) , Enam Khalil (University of Jordan)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Symmetry , VOL 13

State: Published (Approved)
Published: January 2021
Diamond Proposal Number(s): 19787

Open Access Open Access

Abstract: Insulin mucoadhesive buccal films (MBF) are a noninvasive insulin delivery system that offers an advantageous alternative route of administration to subcutaneous injection. One major concern in the formulation of insulin MBF is the preservation of an insulin secondary structure in the presence of the other film components. Buccal films were formulated using chitosan, glycerin, and L-arginine. The MBF-forming solutions (MBF-FS) and the films (MBF) were examined for their chemical and structural stability and for their in vivo activity. Enzyme-Linked Immunosorbent Assay (ELISA) of the insulin-loaded MBF showed that each individualized unit dose was at least loaded with 80% of the insulin theoretical dose. Results of Synchrotron Radiation Circular Dichroism (SRCD) measurements revealed that MBF-FS retained the α-helices and β–sheets conformations of insulin. Fourier transform infrared (FTIR)-microspectroscopy (FTIR-MS) examination of insulin MBF revealed the protective action of L-arginine on insulin structure by interacting with chitosan and minimizing the formation of an unordered structure and β-strand. A blood glucose-lowering effect of insulin MBF was observed in comparison with subcutaneous (S.C) injection using a rat model. As a result; chitosan-based MBFs were formulated and characterized using SRCD and FTIR-MS techniques. Furthermore, the results of in vivo testing suggested the MBFs as a promising delivery system for insulin.

Journal Keywords: insulin; chitosan; mucoadhesive; buccal films; synchrotron radiation circular dichroism; FTIR-microspectroscopy; in vivo

Subject Areas: Biology and Bio-materials, Medicine

Instruments: B23-Circular Dichroism

Other Facilities: SESAME Light Source