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Extracellular Amylase Activity from Endophytic Streptomyces griseoflavus P4


Paper Type 
 Contributed Paper
Title 
 Extracellular Amylase Activity from Endophytic Streptomyces griseoflavus P4
Author 
 Julaluck Tang-um and Hataichanoke Niamsup*
Email 
 hataichanoke.n@cmu.ac.th
Abstract:

Amylase enzymes are currently used to accelerate starch degradation in many industrial processes. Streptomyces sp., an endophytic actinomycete, is well known as a potential source of hydrolytic enzymes, antimicrobial agents, and many secondary metabolites. Previously, an endophytic Streptomyces griseoflavus P4 was isolated from sweet pea root and identified by 16S rRNA sequence analysis. Using a plate assay, the S. griseoflavus P4 was found to be capable of producing amylase enzymes, as a clear zone around colonies appeared after iodine reagent was added to the plate. The maximum amylase activity was 1.66±0.07 U/mL on the 7th day of growth, while the total biomass was 0.085±0.005 g of dry pellet in 100 mL medium. In this work, the P4 strain exhibited a specific activity of 118.4 U/mg protein. Amylase production was found to be growth-associated and started in a log phase.  Maximum enzyme production was reached during the stationary phase. The optimal conditions for activity were found to be 40 degrees C and a pH of 7.
Start & End Page 
 346 - 350
Received Date 
 2011-08-08
Revised Date 
Accepted Date 
 2011-11-16
Full Text 
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Keyword 
 Endophyte, actinomycete, streptomycete, amylolytic activity, starch
Volume 
 Vol.39 No.2 (APRIL 2012)
DOI 
Citation 
 Tang-um J. and Niamsup* H., Extracellular Amylase Activity from Endophytic Streptomyces griseoflavus P4, Chiang Mai Journal of Science, 2012; 39(2): 346-350.
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