PROIMI   05436
PLANTA PILOTO DE PROCESOS INDUSTRIALES MICROBIOLOGICOS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Physiological and biochemical characterization of pseudoalteromonas sp. p8 a cold-active xylanases producer
Autor/es:
ADRIANA E. ALVARENGA; CRISTÓBAL H. A.; ABATE C. M.
Lugar:
Rosario
Reunión:
Congreso; V Congreso Argentino de Microbiología General; 2008
Institución organizadora:
SAMIGE
Resumen:
Xylanolitic enzymes are involved in a variety of industrial
reactions. Several studies have reported that enzymes
produced by psychrophiles organisms have high specific
activity at low and moderate temperature, and an elevate
thermosensibility. Those properties are very useful to perform
biological transformations at low temperatures. The aims of this
work were: 1) Qualitative and quantitative determinations of
xylanolitic activity from the Pseudoalteromonas sp. P8 strain.
2) Biochemical and physiological assays to characterize the
microorganism.
P8 strain was grown in minimum medium added with xylan
and hemicellulose. Enzymatic activities were detected at 4 and
20 ºC by the appearance of clarification halos after Congo red
staining. Xylanase activity was determined at several
temperatures (15, 25, 30 and 37 ºC) by the 3,5 dinitrosalicylic
acid (DNS) method. The highest specific activity was registered
at 25 ºC. Biochemical and physiological characterization were
carried out using the API 20 NE (BioMerieux) test, and by
growth curves at 4 and 20ºC. The obtained results
demonstrate that Pseudoalteromonas sp. P8 is a promissory
strain for cold- active xylanase expression.Pseudoalteromonas sp. P8 strain.
2) Biochemical and physiological assays to characterize the
microorganism.
P8 strain was grown in minimum medium added with xylan
and hemicellulose. Enzymatic activities were detected at 4 and
20 ºC by the appearance of clarification halos after Congo red
staining. Xylanase activity was determined at several
temperatures (15, 25, 30 and 37 ºC) by the 3,5 dinitrosalicylic
acid (DNS) method. The highest specific activity was registered
at 25 ºC. Biochemical and physiological characterization were
carried out using the API 20 NE (BioMerieux) test, and by
growth curves at 4 and 20ºC. The obtained results
demonstrate that Pseudoalteromonas sp. P8 is a promissory
strain for cold- active xylanase expression.Pseudoalteromonas sp. P8 is a promissory
strain for cold- active xylanase expression.