Chemija / Chemistry
 ISSN 0235-7216 ISSN 2424-4538 (online) |
2017 m. Nr. 1 PVA and various diisocyanates based poly(urethane–urea) microcapsules for encapsulation of enzyme in water/butyl acetate emulsion: synthesis and study
This study evaluates the impact of three different diisocyanates, (1,6-hexamethylene diisocyanate (HMDI), toluene-2,4-diisocyanate (TDI), or 4,4’-methylene diphenyl diisocyanate (MDI), on the structure and properties of PVA-based (poly(vinyl alcohol)) poly(urethane–urea) microcapsules (PUUMC). PUUMC consisting of an aqueous solution of maltogenic α-amylase (MG) were obtained via interfacial polyaddition in the proposed herein environment–friendly inverse water/butyl acetate emulsion at 30–70 °C temperature. It was shown that the reactivity of diisocyanates and the variations of synthesis time and temperature affected the encapsulation efficiency of MG and its release from PUUMC. It was found that the enzyme release from PUUMC mostly depended on the used diisocyanate.
: Keywords: poly(urethane–urea), poly(vinyl alcohol), microencapsulation, porosity |
Issues:
2017 - Vol.28 No. 1, No. 2, No. 3, No. 4 2016 - Vol.27 No. 1, No. 2, No. 3, No. 4 2015 - Vol.26 No. 1, No. 2, No. 3, No. 4 2014 - Vol.25 No. 1, No. 2, No. 3, No. 4 2013 - Vol.24 No. 1, No. 2, No. 3, No. 4 2012 - Vol.23 No. 1, No. 2, No. 3, No. 4 2011 - Vol.22 No. 1, No. 2, No. 3, No. 4 2010 - Vol.21 No. 1, No. 2-4 2009 - Vol.20 No. 1, No. 2, No. 3, No. 4 2008 - Vol.19 No. 1, No. 2, No. 3-4 2007 - Vol.18 No. 1, No. 2, No. 3, No. 4 2006 - Vol.17 No. 1, No. 2-3, No. 4 2005 - Vol.16 No. 1, No. 2, No. 3-4 2004 - Vol.15 No. 1, No. 2, No. 3, No. 4 2003 - Vol.14 No. 1, No. 2, No. 3, No. 4 2002 - Vol.13 No. 1, No. 2, No. 3, No. 4 2001 - Vol.12 No. 1, No. 2, No. 3, No. 4 |