Production and immobilization of a novel thermoalkalophilic extracellular amylase from bacilli isolate
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, cilt.50, sa.4, ss.991-995, 2012 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 50 Sayı: 4
- Basım Tarihi: 2012
- Doi Numarası: 10.1016/j.ijbiomac.2012.02.011
- Dergi Adı: INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.991-995
- Sivas Cumhuriyet Üniversitesi Adresli: Evet
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.