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Lipase‐catalysed interesterification of palm stearin with soybean oil in a continuous fluidised‐bed reactor
Author(s) -
Osório Natália M.,
Gusmão José H.,
da Fonseca M. Manuela,
FerreiraDias Suzana
Publication year - 2005
Publication title -
european journal of lipid science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.614
H-Index - 94
eISSN - 1438-9312
pISSN - 1438-7697
DOI - 10.1002/ejlt.200501188
Subject(s) - interesterified fat , palm stearin , chemistry , lipase , soybean oil , chromatography , food science , triacylglycerol lipase , candida antarctica , palm oil , organic chemistry , enzyme
The aim of this study was the interesterification of palm stearin with soybean oil, catalysed by a commercial immobilised lipase from Candida antarctica , in a continuous fluidised‐bed reactor. The interesterification was indirectly followed by the decrease in the solid fat content at 35 °C (SFC 35 °C ). The best reaction conditions were previously established batchwise via response surface methodology as a function of temperature and medium composition. The reactor operated continuously for 21 days. During the first 16 days, no significant decrease in the initial activity was observed and a reduction of 30–40% in the SFC 35 °C was achieved. Subsequently, a progressive decrease in the activity was detected, and a reduction of only 5% in the SFC 35 °C was obtained after 21 days of operation. The biocatalyst could be partially reactivated and was reused, under the same conditions, for a further period of 21 days. A similar inactivation profile, described by a series‐type inactivation kinetics model, was observed. The estimated values for the half‐life and the deactivation coefficient were the same for the fresh and reactivated biocatalyst (17 days and 0.0035 d −2 , respectively). The free fatty acid content of the interesterified fat in the continuous reactor (0.7–1.2%) was lower than that of the fat obtained batchwise (2–6%).