Study of the acetic bacteria nutritional necessity for the acid production / Estudo das necessidades nutricionais de bacterias aceticas para a produção de acido acetico

AUTOR(ES)

Vitorio dos Santos Junior

DATA DE PUBLICAÇÃO

2009

RESUMO

The acetical bacteria are used in vinegar production. The nutritional requirement of acetical bacteria is poorly known, and the maintenance of these microorganisms is too difficult. The reactors of submerged acetical fermentation promote conditions of physiologic stress: acidity (up to 10% p/v), alcohol (2%p/v) and oxygenation (0,4 vvm).These parameters are considerate extremes and indicate the necessity of the activation of specifics metabolic to the maintenance of alcohol-acetic acid transformation capacity and cell division. This research has in view to contribute to the qualitatively and quantitatively evaluation of minerals effects on the productivity of acetic acid, which is defined as the acetic acid percentage produced until 24 hours. These experiments were conducted with of Acetobacter sp. strain, proceeding from vinegar industries. The work steps were: activation of the reactor with standard nutrient; minerals effects tests using the fractional factorial design (25-1) as statistic tool; isolation and identification of the microorganisms, employing classical biochemistry proofs and molecular analysis of the RNA messenger expression, through DDRT/PCR techniques, applying alcohol dehydrogenase enzyme primers. With the results obtained from the fractional factorial design for the strains studied, were selected minerals as the iron, the molybdenum and the manganese that increase productivity and, yet, minerals as zinc and boron that decrease it. The reactor isolated strain presented all biochemical characteristics of Acetobacter genus and the molecular analysis evidenced the expression of the gene for the enzyme alcohol dehidrogenase in all experiments

ASSUNTO(S)

produtividade acetobacter alcohol dehydrogenase acetobacter alcool desidrogenase nutrientes nutrients productivity

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