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Diacetyl production and growth of Lactobacillus rhamnosus on multiple substrates

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Title Diacetyl production and growth of Lactobacillus rhamnosus on multiple substrates
 
Creator JYOTI, BD
SURESH, AK
VENKATESH, KV
 
Subject lactococcus-lactis
acetoin production
co-metabolism
pyruvate
citrate
fermentation
mesenteroides
biosynthesis
bacteria
yeast
co-metabolism
diacetyl
diauxic growth
lactobacillus rhamnosus
multiple substrates
 
Description Lactobacillus rhamnosus is a heterolactic acid bacterium, which can be used to produce flavour compounds like diacetyl and acetoin. Various startegies have been applied to improve the growth rate and diacetyl yield. The use of multiple substrates affected growth as well as the yield of diacetyl. Growth on a medium containing glucose demonstrated a diauxic growth profile, with the second phase of growth being on the product, lactic acid. L. rhamnosus also grew on a medium containing citrate. Growth on medium containing glucose+citrate demonstrated simultaneous utilization of carbon sources. L. rhamnosus did not grow in a medium containing acetate and also did not co-metabolize it with glucose. Maximum specific growth rate (mu(max)) was found to increase in the case of simultaneous utilization of glucose+citrate (0.38 h(-1)) as compared to glucose as the sole carbon source (0.28 h(-1)). The yields of diacetyl were also found to increase for glucose+pyruvate and glucose+citrate (0.10 and 0.05 g g(-1) of glucose, respectively) as compared to glucose alone (0.01 g g(-1) of glucose). The productivity of diacetyl on medium containing glucose and citrate was double that of a medium containing only citrate, although the yields were comparable.
 
Publisher KLUWER ACADEMIC PUBL
 
Date 2011-08-17T04:20:03Z
2011-12-26T12:55:20Z
2011-12-27T05:44:08Z
2011-08-17T04:20:03Z
2011-12-26T12:55:20Z
2011-12-27T05:44:08Z
2003
 
Type Article
 
Identifier WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY, 19(5), 509-514
0959-3993
http://dx.doi.org/10.1023/A:1025170630905
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9742
http://hdl.handle.net/10054/9742
 
Language en