Design and Characterization of Double Layered Mucoadhesive System Containing Bisphosphonate Derivative

Figure 2

FTIR spectra of (a) pure drug, (b) pure chitosan, and (c) pure HPMC 4KM. (d) physical mixture (1 : 1) HPMC 4KM and chitosan and (e) physical mixture of drug : polymer (1 : 1) [Drug + HPMC4KM + chitosan].

(a)

(b)

(c)

(d)

(e)