Pengaruh proses loading obat terhadap mekanisme disolusi obat amoksisilin trihidrat terenkapsulasi hidrogel semi-IPN kitosan-poli(n-vinilpirrolidon) dengan agen pembentuk pori KHCO3 dalam sistem penghantar obat mengapung = Effect drug loading method against dissolution mechanism of encapsulated amoxicillin trihydrate in matrix of semi ipn chitosan-poly(n- vinylpirrolidone) hydrogel with KHCO3 as pore forming agent in floating drug delivery system