Abstract
This study aimed to optimize free fatty acid production by enzymatic hydrolysis of cottonseed, olive and palm kernel oils in stirred-tank reactors using a lipase from Geotrichum candidum (GCL-I). The effect of pH, temperature and substrate concentration on the hydrolytic activity of GCL-I using these vegetable oils was investigated. Thermal stability tests and thermodynamic studies were also performed. A complete hydrolysis of cottonseed oil was obtained after 120 min of reaction, while for olive and palm kernel maximum hydrolysis percentage was 96.4% and 60.1%, respectively. GCL-I exhibited the highest activity in the hydrolysis of vegetable oils that are rich in unsaturated-fatty acids (cottonseed and olive oils). Under optimal conditions (46.8% m/m of oil, 6.6 U/g of the reaction mixture at 40 °C), complete cottonseed oil hydrolysis was observed at 60 min of reaction performed in an emulsifier-free system with no buffer.
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Acknowledgements
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brasil (CAPES)-Finance Code 001. The authors are grateful to Fundação de Amparo à Pesquisa do Estado de Minas Gerais-FAPEMIG (TEC-APQ-02755-16) for its financial support. MSc. Matheus M. Ferreira thanks CAPES for his student fellowship. Gustavo F. Oliveira thanks Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for his IC fellowship.
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Ferreira, M.M., de Oliveira, G.F., Basso, R.C. et al. Optimization of free fatty acid production by enzymatic hydrolysis of vegetable oils using a non-commercial lipase from Geotrichum candidum. Bioprocess Biosyst Eng 42, 1647–1659 (2019). https://doi.org/10.1007/s00449-019-02161-2
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DOI: https://doi.org/10.1007/s00449-019-02161-2