Production and immobilization of a novel thermoalkalophilic extracellular amylase from bacilli isolate


AKKAYA B. , YENİDÜNYA A. F. , AKKAYA R.

INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, cilt.50, ss.991-995, 2012 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 50 Konu: 4
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1016/j.ijbiomac.2012.02.011
  • Dergi Adı: INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
  • Sayfa Sayıları: ss.991-995

Özet

A Thermoalkalophilic amylase was produced from an environmental bacterial isolate. The enzyme was then immobilized through its amino groups onto the epoxy rings of magnetic poly glycidyl methacrylate [m-poly (GMA)] beads. The free enzyme was active within a large pH range, between 7 and 12 and displayed the optimum activity at 95 degrees C and pH 10. The immobilization appeared to increase the stability of the enzyme as its bound form showed optimum activity at 105 degrees C and pH 11.0. Kinetic studies demonstrated that immobilized enzyme had higher K-m and lower V-max values. The activity of the free and bound enzyme was determined, at 37 degrees C and pH 10.0 and pH 11.0, respectively, in the presence of various organic solvents and detergents (5%, v/v). Results obtained indicated that detergents, sodium dodecyl sulfate (SDS) and TritonX-100, caused six fold increase and that various organic solvents also increased the activity of the amylase. (C) 2012 Elsevier B.V. All rights reserved.