Varshosaz, J. and Hajian, M. (2004) Characterization of Drug Release and Diffusion Mechanism through Hydroxyethyl Methacrylate/Methacrylic Acid pH-Sensitive Hydrogel. Drug Delivery, 11, 53-58.
https://doi.org/10.1080/10717540490265298

has been cited by the following article:

• TITLE: Study of Pneumococcal Surface Protein, PspA, Incorporated in Poly(Vinyl Alcohol) Hydrogel Membranes

  AUTHORS: Hazim Aljewari, Raquel de Castro, Olivia Solomon, Quincy C. Moore III, Felecia Nave, Audie Thompson

  KEYWORDS: Hydrogel, Recombinant PspA, Drug Delivery, Vaccine, Poly(Vinyl Alcohol) (PVA) Membrane, Streptococcus Pneumoniae

  JOURNAL NAME: Journal of Biomaterials and Nanobiotechnology, Vol.11 No.1, January 14, 2020

  ABSTRACT: This study investigates poly(vinyl alcohol) (PVA) membranes as controlled release micro-matrices, which can be useful in therapeutic applications for optimizing the administration of drugs. Currently, the use of hydrogels is limited by protein size. This study investigates the delivery of PspA, a large protein of approximately 38 kD. Pneumococcal surface protein A (PspA) has been shown to provide protective immunity against pneumococcal infection and is considered as a pneumococcal vaccine. The protein release experiments demonstrated that from an initial pH 7.4, approximately 60% of PspA diffuse into a neutral environment with an initial burst and a declining rate reaching equilibrium. The results indicate that the protein was successfully incorporated and released from the membrane over time. The hydrogel and protein interaction is temporary, and the membrane system is ideal for protein drug delivery. The data confirm that the protein did not aggregate and was active after release. The protein release is promising and a step forward to develop microneedles to facilitate high molecular weight protein delivery as well as vaccine delivery.