| Journal: | Electronic journal of biotechnology |
| Database: | PERIÓDICA |
| System number: | 000360073 |
| ISSN: | 0717-3458 |
| Authors: | Krueger, Cristhiane1 Radetski, Claudemir2 Bendia, Amanda2 Oliveira, Ida2 Castro-Silva, Marcus A3 Rambo, Carlos3 Antonio, Regina4 Lima, Andre O.S2 |
| Institutions: | 1Universidade Federal de Santa Catarina, Campus Universitario Trindade, Florianopolis, Santa Catarina. Brasil 2Universidade do Vale do Itajai, Centro de Ciencias Tecnologicas, da Terra e do Mar, Itajai, Santa Catarina. Brasil 3Universidade Federal de Santa Catarina, Departamento de Engenharia Eletrica, Florianopolis, Santa Catarina. Brasil 4Universidade Federal de Santa Catarina, Departamento de Bioquimica, Florianopolis, Santa Catarina. Brasil |
| Year: | 2012 |
| Season: | May |
| Volumen: | 15 |
| Number: | 3 |
| Pages: | 8-8 |
| Country: | Chile |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental |
| English abstract | Unlike petroleum-based synthetic plastics, biodegradable biopolymer generation from industrial residue is a key strategy to reduce costs in the production process, as well as in the waste management, since efficient industrial wastewater treatment could be costly. In this context, the present work describes the prospection and use of bacterial strains capable to bioconvert cassava starch by-product into biodegradable polyhydroxyalkanoates (PHAs). Results: The first step of this study was the bacterial competence screening which was conducted with 72 strains covering 21 Bacillus and related species. The microorganism growth in a medium with a starch substrate was measured by an innovative MTT assay, while the ability of the bacteria to secrete amylase and produce PHA was evaluated by the Nile Red Dye method. Based on growth and potential for PHA production, four isolates were selected and identified as Bacillus megaterium by 16S rRNA sequencing. When cultivated in hydrolyzed cassava starch by-product, maximum production reached 4.97 g dry biomass/L with 29.7% of Poly-(3-hydroxybutyrate) (characterized by FTIR). Conclusions: MTT assay proved to be a reliable methodology for monitoring bacterial growth in insoluble media. Selected amylolytic strains could be used as an alternative industrial process for biodegradable plastics production from starchy residues, reducing costs for biodegradable biopolymer production and wastewater treatment operations |
| Disciplines: | Química, Biología |
| Keyword: | Bioquímica, Química de polímeros, Bacterias, Plásticos biodegradables, Biopolímeros, Bioensayos, Sustrato, Almidón |
| Keyword: | Chemistry, Biology, Biochemistry, Polymer chemistry, Bacteria, Biodegradable plastics, Biopolymers, MTT bioassay, Starch, Substrates |
| Full text: | Texto completo (Ver PDF) |
