Swelling and drug release behavior of tablets coated with aqueous hydroxypropyl methylcellulose phthalate (HPMCP) nanoparticles.
Organic solvent-based enteric coating technology using hydroxypropyl methyl cellulose phthalate (HPMCP) has been developed for many years due to low water solubility of HPMCP. In this work, aqueous HPMCP nanoparticles (HPMCP-NPs) were prepared by neutralization emulsification method using HPMCP powder and ammonium hydroxide (NH(4)OH) in the absence of any organic solvent and emulsifier. Tablets for enteric use were coated with HPMCP-NP dispersions having different degree of neutralization that was manipulated by ion-exchange process. Disintegration and dissolution behavior of coated tablets were investigated using UV-visible spectrophotometer based on USP method (pH 1.2 and at 37 degrees C) and simulated intestinal fluid (pH 6.8 and at 37 degrees C for 60 min), respectively. The ion-exchange process, which was directly achieved by the protonation of dissociated carboxylic acid group of the aqueous HPMCP-NPs, was introduced as a useful way to control the release rate of drug and hydrophobic nature of HPMCP coating layer with a view for pharmaceutical application. The drug release and swelling were increased with increase in conductivity of aqueous HPMCP-NPs. On the other hand, particle size and polydispersity were decreased with increase in degree of neutralization.
Kim
Il Hyuk
IH
Nanosphere Process and Technology Laboratory, Division of Chemical Engineering and Biotechnology, Yonsei University, 134 Shinchon-dong, Sudaemoon-ku, 120-749, Seoul, South Korea.
Park
Jung Hwan
JH
Cheong
In Woo
IW
Kim
Jung Hyun
JH
D008747:Methylcellulose / Q000031:analogs & derivatives* / Q000737:chemistry* / Q000493:pharmacokinetics*; D043942:Nanotubes / Q000737:chemistry*; D013608:Tablets, Enteric-Coated / Q000737:chemistry* / Q000493:pharmacokinetics*
D013608:Tablets, Enteric-Coated; D008747:Methylcellulose; C053309:hydroxypropyl methylcellulose phthalate