Prethodno priopćenje
Selection of Co-Substrate and Aeration Conditions for Vanillin Production by Escherichia coli JM109/pBB1
Paolo Torre
; Department of Chemical and Process Engineering, Genoa University, via Opera Pia 15, I-16145 Genoa, Italy
Danilo De Faveri
; Department of Chemical and Process Engineering, Genoa University, via Opera Pia 15, I-16145 Genoa, Italy
Patrizia Perego
; Department of Chemical and Process Engineering, Genoa University, via Opera Pia 15, I-16145 Genoa, Italy
Attilio Converti
; Department of Chemical and Process Engineering, Genoa University, via Opera Pia 15, I-16145 Genoa, Italy
Paolo Barghini
; Department of Agrobiology and Agrochemistry, Tuscia University, I-01100 Viterbo, Italy
Maurizio Ruzzi
; Department of Agrobiology and Agrochemistry, Tuscia University, I-01100 Viterbo, Italy
Fabrícia P. Faria
; Departamento de Ciências Fisiológicas, Laboratório de Biologia Molecular, ICB2, Campus Samambaia, Universidade Federal de Goiás, 74001-970 Goiânia, GO, Brazil
Sažetak
Yeast extract, Luria-Bertani medium and tryptone were tested as co-substrates for vanillin production from ferulic acid by resting cells of Escherichia coli JM109/pBB1. Yeast extract proved to be the best component for sustaining such a bioconversion, which is not self-sustained from the bioenergetic point of view. Tests were also performed under variable aeration conditions by simultaneously varying the ratio of medium to vessel volume and the agitation speed. The results of these tests suggest that, under excess aeration, a non-specific oxidase activity was very likely responsible for the oxidation of a significant portion of vanillin to vanillic acid, thus reducing the vanillin yield.
Ključne riječi
Escherichia coli; vanillin; ferulic acid; resting cells; vanillic acid
Hrčak ID:
110846
URI
Datum izdavanja:
15.9.2004.
Posjeta: 926 *