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In Vitro assessment of the enzymatic degradation of several PVA/starch materials

L. JECU1,* , I. RAUT1, M. CALIN1, E. OCNARU1, M. L. ARSENE1, E. GROSU2, V. PURCAR1

Affiliation

  1. National Research and Development Institute for Chemistry and Petrochemistry – ICECHIM, Spl. Independentei 202, 006021 Bucharest, Romania
  2. SC ICPE Bistrita S.A., Parcului Street, nr. 7, Bistrita, Romania

Abstract

Plastic blends on poly(vinyl alcohol) (PVA) and natural polymer are ones of the most popular biodegradable plastics with many applications in packaging. In the present paper, the susceptibility of PVA/starch materials to enzymatic degradation by amylolytic enzymes (α-amylase) was investigated by incubating the materials with buffer enzymatic solutions at 27°C for 168 hours. Two polymeric blends of PVA with starch were studied. SEM micrographs show modification of polymer surface after enzymatic hydrolysis. The material degradation was characterized by Fourrier transform infrared-attenuated total reflectance (FTIR-ATR). FTIR-ATR spectra confirmed a decrease on the band corresponding to glycosidic linkage (-C-O-C-) of starch after incubation of the materials with α-amylase. The results showed that starch polymeric blends are susceptible to enzymatic degradation, as detected by 30% weight loss after enzyme incubation..

Keywords

Enzymatic degradation, PVA/starch blends, α-amylase.

Submitted at: March 25, 2013
Accepted at: July 11, 2013

Citation

L. JECU, I. RAUT, M. CALIN, E. OCNARU, M. L. ARSENE, E. GROSU, V. PURCAR, In Vitro assessment of the enzymatic degradation of several PVA/starch materials, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 7-8, pp. 869-873 (2013)