resumo
Bacterial cellulose (BC), a very peculiar form of cellulose, is gaining considerable importance due to its unique properties. In this study, several residues, from agro-forestry industries, namely grape skins aqueous extract, cheese whey, crude glycerol and sulfite pulping liquor were evaluated as economic carbon and nutrient sources for the production of BC. The most relevant BC amounts attained with the residues from the wine and pulp industries were 0.6 and 0.3 g/L, respectively, followed by biodiesel crude residue and cheese whey with productions of about, 0.1 g/L after 96 h of incubation. Preliminary results on the addition of other nutrient sources (yeast extract, nitrogen and phosphate) to the residues-based culture media indicated that, in general, these BC productions could be increased by similar to 200% and similar to 100% for the crude glycerol and grape skins, respectively, after the addition organic or inorganic nitrogen. (C) 2011 Elsevier Ltd. All rights reserved.
palavras-chave
GLUCONACETOBACTER-XYLINUS STRAIN; DIFFERENT CARBON-SOURCES; ACETOBACTER-XYLINUM; MICROBIAL CELLULOSE; WHEY; POLY(3-HYDROXYBUTYRATE); MOLASSES; COLI
categoria
Agriculture; Biotechnology & Applied Microbiology; Energy & Fuels
autores
Carreira, P; Mendes, JAS; Trovatti, E; Serafim, LS; Freire, CSR; Silvestre, AJD; Neto, CP
nossos autores
Armando Jorge Domingues Silvestre
Professor Catedrático
Carlos Pascoal Neto
Diretor do Raiz
Carmen Sofia da Rocha Freire Barros
Investigador Coordenador
Luísa Seuanes Serafim
Professor Auxiliaragradecimentos
The authors would like to acknowledge Prof. Maria Reis (UNL) for supplying the crude glycerol and cheese whey samples, Prof. Dmitry Evutguin (UA) for the grape skins extract and Prof. Ana Xavier (UA) for the SSL sample. FCT (Fundacao para a Ciencia e Tecnologia) is acknowledged by Eliane Trovatti (Postdoctoral research grant SFRH/BPD/63250/2009). Authors thank Portuguese Foundation for Science and Technology (FCT Project PTDC/AGR-AAM/104911/2008) and the Operation Program of Competitive Factors (COMPETE, ref. FCOMP-01-0124-FEDER-008734) for the financial support of this work. The authors also thank FCT for funding within the scope of the