INVESTIGADORES
MEDINA Roxana Beatriz
artículos
Título:
INFLUENCE OF CITRATE, GLUCOSE AND LACTOSE ON DIACETYL AND ACETOIN PRODUCTION BY Lactobacillus casei subp. rhamnosus ATCC 7469
Autor/es:
BENITO DE CÁRDENAS, I.L.; MEDINA, R.B.; OLIVER, G.
Revista:
Microbiologie, Aliments, Nutrition
Editorial:
Asociación Argentina de Microbiología
Referencias:
Año: 1993 vol. 24 p. 399 - 407
ISSN:
0759-0644
Resumen:
The utilization of citrate by Lactobacillus casei subsp. rhamnosus ATCC 7469 in a complex medium containing glucose, lactose or citrate was investigated, as an approach to the question of the transport of this acid and the possible relationship with the production of flavour compounds (diacetyl and acetoin). This Lactobacillus uses citrate as an energy source in the absence of carbohydrates. External pH and growth increases when citrate is added to complex medium. The presence of citrate does not affect glucose uptake. L. casei ATCC 746 possibly uses a transport system for citrate utilization, and citrate uptake seems to be under glucose or lactose control. Lactose only inhibits the entrance of citrate at high concentration while the utilization of this acid was negatively regulated by low glucose concentration.