Data/hora: 06/06/2024 01:12:48

Provedor de dados: | 58
País: | Brazil
Título: | Synthesis of structured triacylglycerols enriched in n-3 fatty acids by immobilized microbial lipase
Autores: | Araújo,Maria Elisa Melo Branco de; Campos,Paula Renata Bueno; Alberto,Thiago Grando; Contesini,Fabiano Jares; Carvalho,Patrícia de Oliveira.
Data: | 2016-12-01
Ano: | 2016
Palavras-chave: | Lipase; Immobilization; Soybean oil; Polyunsaturated fatty acids.
Resumo: | Abstract The search for new biocatalysts has aroused great interest due to the variety of micro-organisms and their role as enzyme producers. Native lipases from Aspergillus niger and Rhizopus javanicus were used to enrich the n-3 long-chain polyunsaturated fatty acids content in the triacylglycerols of soybean oil by acidolysis with free fatty acids from sardine oil in solvent-free media. For the immobilization process, the best lipase/support ratios were 1:3 (w/w) for Aspergillus niger lipase and 1:5 (w/w) for Rhizopus javanicus lipase using Amberlite MB-1. Both lipases maintained constant activity for 6 months at 4 °C. Reaction time, sardine-free fatty acids:soybean oil mole ratio and initial water content of the lipase were investigated to determine their effects on n-3 long-chain polyunsaturated fatty acids incorporation into soybean oil. Structured triacylglycerols with 11.7 and 7.2% of eicosapentaenoic acid + docosahexaenoic acid were obtained using Aspergillus niger lipase and Rhizopus javanicus lipase, decreasing the n-6/n-3 fatty acids ratio of soybean oil (11:1 to 3.5:1 and 4.7:1, respectively). The best reaction conditions were: initial water content of lipase of 0.86% (w/w), sardine-free faty acids:soybean oil mole ratio of 3:1 and reaction time of 36 h, at 40 °C. The significant factors for the acidolysis reaction were the sardine-free fatty acids:soybean oil mole ratio and reaction time. The characterization of structured triacylglycerols was obtained using easy ambient sonic-spray ionization mass spectrometry. The enzymatic reaction led to the formation of many structured triacylglycerols containing eicosapentaenoic acid, docosahexaenoic acid or both polyunsaturated fatty acids.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000401006
Editor: | Sociedade Brasileira de Microbiologia
Relação: | 10.1016/j.bjm.2016.07.003
Formato: | text/html
Fonte: | Brazilian Journal of Microbiology  v.47 n.4 2016
Fonte: | info:eu-repo/semantics/openAccess