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Extraction of lutein diesters from tagetes erecta using supercritical $CO_2$ and liquid propane
Mojca Škerget, Miran Bezjak, Katja Makovšek, Željko Knez, 2010, original scientific article

Abstract: The efficiency of high pressure extraction of lutein diesters from marigold (Tagetes erecta) flower petals has been investigated. The solvents used for extraction were supercritical carbon dioxide and liquid propane. Operating parameters were 300 bar and 40, 60 and 80 °C for $CO_2$ and 100, 150, 200 bar and 40 and 60 °C for propane, respectively. The influence of process parameterson the total yield of extraction and content of lutein diesters in the extracts was investigated. The results show, that solvent power of propanefor lutein diesters is approximately 3.5 times higher than of $CO_2$. The calculation procedure based on the Fick's second law was applied to determine the diffusivities of lutein diesters during extraction from marigold flower petals for both extraction stages: a constant rate stage followed by a stage of decreasing rate. The mathematical model based on the Fick's second law well described the experimental extraction results.
Keywords: lutein diesters, Tagetes errecta, extraction, supercritical $CO_2$, subcritical propane
Published in DKUM: 10.07.2015; Views: 1514; Downloads: 143
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Extraction of lutein from Marigold flower petals - Experimental kinetics and modelling
Maša Hojnik Niderl, Mojca Škerget, Željko Knez, 2008, original scientific article

Abstract: The extraction kinetics behaviour of lutein from Marigold flower petals and simultaneous alkali hydrolysis has been studied. Extraction was carried out by varying following operating conditions: type of organic solvent, temperature, ratio liquid: material, concentration of alkali solution, and particle size of plant material. Experimental extraction curves were analysed with a mathematical model derived from Fick's second law. The extraction of lutein appeared to be governed by slow and fast diffusion processes. Results showed that the intra-particle diffusion was the rate-governing step of the extraction process, and that the chosen model gives very good approximation of experimental data.
Keywords: lutein, marigold, conventional extraction, diffusivity, mass transfer
Published in DKUM: 31.05.2012; Views: 2372; Downloads: 114
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