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Chiang Mai Journal of Science, Faculty of Science, Chiang Mai University
 


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Utilization of Non-rubber Skim Latex for Poly(L-lactide)-degrading Enzyme Production by Actinomadura keratinilytica Strain T16-1


Paper Type 
Contributed Paper
Title 
Utilization of Non-rubber Skim Latex for Poly(L-lactide)-degrading Enzyme Production by Actinomadura keratinilytica Strain T16-1
Author 
Sabadee Worrathampitak [a], Shinji Tokuyama [b], Vichien Kitpreechavanich [c] and Sukhumaporn Sukkhum* [a]
Email 
sukhumaporn@g.swu.ac.th
Abstract:
This research demonstrated a new method to utilize nutrient composition in non-rubber skim latex for Poly (L-lactic acid) (PLA)-degrading enzymes production due to the enzyme is a very important trend regarding recycling plastic wastes in the future. Moreover, we attempted to find an alternative supporter such as scrub pad for cell immobilization and used as material for the enzyme production under open continuous fermentation. The PLA-degrading enzyme production was determined using a non-rubber skim latex and basal medium containing 0.035% (w/v) PLA powder and 1% (w/v) scrub pad as a supporter for the bacterial cells in a shake flask and fermenter. The effect of the physical parameters and the nitrogen sources were studied. The following optimal conditions were used: gelatin as the nitrogen source, a temperature of 45°C, an initial pH of 7.0, an agitation speed of 100 rpm, without aeration support and 3 days of cultivation. This resulted in an activity of approximately 41 U/ml and 0.56 U/ml.h of productivity in the 2 L fermenter. The highest PLA-degrading activity, 45 U/ml, was achieved in the fermenter by a continuous process under open fermentation with a dilution rate of 0.013 h-1. These results mean that non-rubber skim latex has the potential for PLA-degrading enzyme production through an open fermentation method in strain T16-1. 
Start & End Page 
1016 - 1026
Received Date 
2015-03-09
Revised Date 
Accepted Date 
2015-06-08
Full Text 
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Keyword 
optimization, open fermentation, cell immobilization, continuous fermentation
Volume 
Vol.43 No.5 (OCTOBER 2016)
DOI 
Citation 
[a] S.W., [b] S.T., [c] V.K. and [a] S.S., Utilization of Non-rubber Skim Latex for Poly(L-lactide)-degrading Enzyme Production by Actinomadura keratinilytica Strain T16-1, Chiang Mai Journal of Science, 2016; 43(5): 1016-1026.
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