Immobilization of alpha-amylase onto cyclic carbonate bearing hybrid material

Turunc O., KAHRAMAN M. V. , Akdemir Z. S. , KAYAMAN APOHAN N. , Gungor A.

FOOD CHEMISTRY, cilt.112, sa.4, ss.992-997, 2009 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 112 Konu: 4
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1016/j.foodchem.2008.07.024
  • Sayfa Sayıları: ss.992-997


Under ambient conditions, 4-((3-trimethoxysilyl)propoxy)methyl)1,3-dioxolan-2-one was synthesized from 3-glycidyloxypropyl trimethoxysilane. Methacrylate and cyclic carbonate functional hybrid matrix was prepared by sol-gel method. alpha-Amylase was covalently bounded onto the matrix via cyclic carbonate functionality. Immobilization yield was found as 34.4 +/- 2.6 mg per gram of hybrid matrix. The maximum activity was observed at pH 6.5. Immobilization did not change the pH-dependency of the enzyme. The immobilized enzyme had a higher activity at elevated temperature (50-80 degrees C) than the free one. Immobilized enzyme exhibited 80% activity after 20 runs and 69% after 30 runs. Free enzyme lost its activity completely within 15 days. Immobilized enzyme lost only 30% of its activity in 25 days. V-max values for the free and immobilized enzymes were calculated as 58 x 10(-3) and 5.2 x 10(-3) mg/ml min(-1), respectively. (C) 2008 Elsevier Ltd. All rights reserved.