title: Production of novel cell-associated tannase from newly isolated Serratia ficaria DTC.
abstract: Five strains of tannic acid degrading bacteria were isolated and identified by phenotypic characterization. All the five isolates showed cell-associated activity, where as only three showed extracellular activity. Serratia ficaria DTC showing highest cell-associated activity (0.29 U/l) was selected for further shake flask studies. Tannase synthesis was growth associated and reached the peak in the late stationary phase of growth. Organic nitrogen sources enhanced the tannase production. Peak tannase production of 0.56 U/l was recorded in the medium having the initial pH of 6. The pH and temperature optima of the enzyme were found to be 8.9 and 35 degrees , respectively. This is the first report of cell-associated activity in case of bacterial tannase. Cell-associated tannase of Serratia ficaria DTC could be industrially important from the perspective of its activity at broad temperature and pH range, its unusually high activity at pH 8.9.
authors.affiliation: Department of Chemical Engineering, National Institute of Technology Karnataka, Surathkal. Srinivasanagar, Mangalore-575 025, India. prsnbhat@gmail.com
authors.forename: Prasanna D
authors.initials: PD
authors.lastname: Belur
authors.forename: Mugeraya
authors.initials: M
authors.lastname: Gopal
authors.forename: K R
authors.initials: KR
authors.lastname: Nirmala
authors.forename: N
authors.initials: N
authors.lastname: Basavaraj
mesh_terms: D002265:Carboxylic Ester Hydrolases / Q000096:biosynthesis* / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D007218:Industrial Microbiology / Q000379:methods*; D012705:Serratia / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism; D013634:Tannins / Q000378:metabolism
chemical_list: D013634:Tannins; D002265:Carboxylic Ester Hydrolases; C022711:tannase