The aim of this study was to investigate the effect of amorphous solid dispersions (ASDs) on the dissolution rate and oral bioavailability of Quercetin (Que). First, we prepared the Que ASDs with various excipients using hot-melt extrusion to find the best option. X-ray diffraction (XRD), infrared spectroscopy (IR), and Raman spectroscopy were used to examine the solid formation of Que. Wetting process was studied by contact angle and solution process. The abilities of HPMC to inhibit crystallization and improve membrane permeability were demonstrated by fluorescence spectroscopy, dynamic light scattering analysis, in vitro permeability experiment and pharmacokinetics studies. Que existed as amorphous in solid dispersions, and poloxamer 188 (F68) was the best excipient for improving Que dissolution. Study on ASDs wettability proved Que ASDs improved wetting property in the presence of the F68. Furthermore, Que/F68/HPMC 1/4/3 and 1/5/2 ASDs belonged to drug-controlled diffusion; Que/F68/HPMC 1/6/1 ASDs belonged to drug/carrier-controlled diffusion; Que/F68 1/7 ASDs belonged to carrier-controlled diffusion. Addition of HPMC significantly inhibited the crystallization, improved membrane permeability and promoted drug absorption of compound Que. Que ASDs prepared enhanced solubility and intestinal absorption. Thus, Que ASDs provide a potent and efficacious formulation for Que oral administration.
Keywords: Quercetin; amorphous solid dispersions; improved permeability; increased dissolution; inhibited crystallization.