Fig. 5. Swelling capacity of PSTP3 in NaCl and KCl (a), swelling and deswelling of PSTP3 in DW and ethanol (b), DW and normal saline (c) and pH 7.4 and 1.2 environments (d). Empty and filled symbols in (b–d) are representing the swelling and deswelling duration of PSTP3 tablets, respectively.