In vitro evaluation of the effects of various additives and polymers on nerve growth factor microspheres. (April 2014)

• Record Type: Journal Article
• Authors: Sun, Huayan; Xu, Fenghua; Guo, Daihong; Liu, Guiyang
• Is Part Of: Drug development and industrial pharmacy. Volume 40:Number 4(2014:Apr.)
• Page Start: 452
• Page End: 457
• Publication Date: 2014-04
• Subjects: Pharmaceutical chemistry -- Periodicals; Pharmaceutical industry -- Periodicals; Drug Industry -- Periodicals; Technology, Pharmaceutical -- Periodicals; 615.05
• DOI: 10.3109/03639045.2013.767829
• Languages: English
• ISSNs: 0363-9045

Abstract

<abstract> <title>Abstract</title> <p> <italic>Objective</italic>: To evaluate the effects of various additives or polymers on the <italic>in vitro</italic> characteristics of nerve growth factor (NGF) microspheres.</p> <p> <italic>Materials and methods</italic>: NGF microspheres were fabricated using polyethylene glycol (PEG), ovalbumin (OVA), bovine serum albumin (BSA) or glucose as protein protectors, and poly(lactide-<italic>co</italic>-glycolide) (PLGA) or poly(lactic acid) (PLA)/PLGA blends as encapsulation materials.</p> <p> <italic>Results</italic>: Encapsulation efficiencies of the NGF microspheres with various additives or polymers were not more than 30%. A comparative study revealed that OVA was somewhat superior over others, and was thus chosen as the protective additive in subsequent experiments. Polymer analysis showed that NGF release from 1:1 PLA (η = 0.8):PLGA (75/25, η = 0.45) microspheres lasted for 90 d with a burst release rate of 12.7%. About 40% of the original bioactivity was retained on the 28th day, while 10% was left on the 90th day.</p> <p> <italic>Discussion and conclusion</italic>: The combination of OVA as an additive and the PLA/PLGA blend as the coating matrix is suitable for encapsulation of NGF in microspheres for extended release.</p> </abstract>