PVA and various diisocyanates based poly(urethane–urea) microcapsules for encapsulation of enzyme in water/butyl acetate emulsion: synthesis and study

Sandra Mačiulytė; Gintarė Gutauskienė; Jana Niedritis; Tatjana Kochanė; Saulutė Budrienė

doi:10.6001/chemija.2017.28.1.10

Sandra Mačiulytė
Gintarė Gutauskienė
Jana Niedritis
Tatjana Kochanė
Saulutė Budrienė

DOI: https://doi.org/10.6001/chemija.2017.28.1.10

Keywords: poly(urethane–urea), poly(vinyl alcohol), microencapsulation, porosity

Abstract

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.