Fig. 7
From: Recent progress in advanced biomaterials for long-acting reversible contraception
(Reprinted with permission from reference [9]. Copyright 2019 American Chemical Society)
A Schematic representation of the fabrication of CS-LNG microsphere in PVA hydrogel. B SEM micrograph of CS-LNG microsphere. C Schematic diagram of PVA hydrogel by hydrogen bonding and annealing. D SEM exhibition of 10% PVA hydrogels after drying and annealing. E Dissolution test observed by SEM micrograph of 10% PVA hydrogel combined with LNG-loaded chitosan microsphere. F Equilibrium swelling ratio of PVA hydrogels. G Cumulative LNG release from PVA hydrogel in vitro