Influence of nitrogen supply on the production of higher alcohols/esters and expression of flavour-related genes in cachaca fermentation
2013
Espinosa Vidal, Esteban | De Billerbeck, Gustavo | Simoes, Diogo Ardaillon | Schuler, Alexandre | Francois, Jean Marie | de Morais, Marcos Antonio
This study provides the first attempt to analyse the influence of ammonium supplements on sugar-cane juice fermentation and the flavour profile in a cachaca industrial process. The objective was to find a relationship between higher alcohol/ester content and the transcription levels of the main genes involved in production of these compounds under cachaca fermentation. Sugar-cane juice with a low amount of assimilable nitrogen (81 mg N/L), was further supplemented with mid-range or high concentrations of ammonium sulfate. Overall, higher alcohol production was reduced by ammonium supplementation, and this can be correlated with a general downregulation of genes encoding decarboxylases and dehydrogenases of the Ehrlich pathway. The production of acetate esters was enhanced by mid-range ammonium supplementation and the production of acyl esters by high ammonium supplementation. The acyl esters could be correlated with expression of alcohol acyl-transferase EEB1 and the acyl esterase IAH1. (C) 2012 Elsevier Ltd. All rights reserved.
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