Preparation and evaluation of microspheres prepared from whey protein isolate

• Published in: Journal of microencapsulation 1998, Vol.15 (1), p.93-105
• Main Authors: Heelan, B. A., Corrigan, O. I.
• Format: Article
• Language: English
• Subjects: Biological and medical sciences; Chemical Phenomena; Chemistry, Pharmaceutical - methods; Chemistry, Physical; General pharmacology; glutaraldehyde; Medical sciences; Microscopy, Electron, Scanning; Microspheres; Milk Proteins - administration & dosage; Milk Proteins - chemistry; Milk Proteins - isolation & purification; Pharmaceutical technology. Pharmaceutical industry; Pharmacology. Drug treatments; swelling; whey protein isolate; Whey Proteins
• ISSN: 0265-2048; 1464-5246
• DOI: 10.3109/02652049809006839

Abstract Whey protein (WPI) microspheres were successfully produced containing hydrochlorothiazide, eosin, patent blue violet and sodium salicylate using a w/o emulsification method with glutaraldehyde cross linking. The release of these compounds from WPI microspheres occurred rapidly, with at least 70% of the incorporated material released for all systems within the first 20min. Release of microsphere payload was essentially complete within 1 h. The degree of glutaraldehyde cross-linking was found to have no effect on the release profile for durations of cross-linking up to 24 h. Of a range of release equations examined, the experimental release data was best described by a biexponential equation and this agrees with the work of Tomlinson et al. (1984) for the release of drugs from albumin microspheres. Swelling of the microsphere systems was examined as this may contribute to the rapid release of drug from these systems.