An original method for producing acetaldehyde and diacetyl by yeast fermentation
Braz. j. microbiol
; 47(4): 949-954, Oct.-Dec. 2016. tab, graf
Artigo
em Inglês
| LILACS
| ID: biblio-828194
Biblioteca responsável:
BR1.1
ABSTRACT
Abstract In this study a natural culture medium that mimics the synthetic yeast peptone glucose medium used for yeast fermentations was designed to screen and select yeasts capable of producing high levels of diacetyl and acetaldehyde. The presence of whey powder and sodium citrate in the medium along with manganese and magnesium sulfate enhanced both biomass and aroma development. A total of 52 yeasts strains were cultivated in two different culture media, namely, yeast peptone glucose medium and yeast acetaldehyde-diacetyl medium. The initial screening of the strains was based on the qualitative reaction of the acetaldehyde with Schiff's reagent (violet color) and diacetyl with Brady's reagent (yellow precipitate). The fermented culture media of 10 yeast strains were subsequently analyzed by gas chromatography to quantify the concentration of acetaldehyde and diacetyl synthesized. Total titratable acidity values indicated that a total titratable acidity of 5.5 °SH, implying culture medium at basic pH, was more favorable for the acetaldehyde biosynthesis using strain D15 (Candida lipolytica; 96.05 mg L-1 acetaldehyde) while a total titratable acidity value of 7 °SH facilitated diacetyl flavor synthesis by strain D38 (Candida globosa; 3.58 mg L-1 diacetyl). Importantly, the results presented here suggest that this can be potentially used in the baking industry.
Texto completo:
Disponível
Coleções:
Bases de dados internacionais
Base de dados:
LILACS
Assunto principal:
Vírus da Hepatite B
/
Hepatite C
/
Hepacivirus
/
Carga Viral
/
Hepatite B
Tipo de estudo:
Estudo diagnóstico
/
Pesquisa qualitativa
Limite:
Humanos
Idioma:
Inglês
Revista:
Braz. j. microbiol
Assunto da revista:
Microbiologia
Ano de publicação:
2016
Tipo de documento:
Artigo
País de afiliação:
Romênia
Instituição/País de afiliação:
"Petru Poni" Institute of Macromolecular Chemistry/RO