Fig. 4From: Development of an M cell targeted nanocomposite system for effective oral protein delivery: preparation, in vitro and in vivo characterizationCD spectra of insulin released from different formulations after incubation in SGF for 1Â h (a) and SIF for 2Â h (b). At the end of incubation in SGF and SIF, each formulation was collected and incubated at pH 6.8. The released insulin underwent CD spectroscopic analysisBack to article page