20.500.12556/DKUM-52378 Extraction of lutein diesters from tagetes erecta using supercritical $CO_2$ and liquid propane 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. Raziskali smo učinkovitost visokotlačne ekstrakcije diestrov luteina iz cvetov žametnice (Tagetes erecta). Topila, ki smo jih uporabili za ekstrakcijo so bila superkritični ogljikov dioksid in tekoči propan. Obratovalni parametri so bili tlak 300 bar in temperatura 40, 60 in 80 °C v primeru $CO_2$ ter 100, 150 in 200 bar in 40 in 60°C za propan. Raziskali smo vpliv obratovalnih parametrov na izkoristek ekstrakcije in vsebnost luteinskih diestrov v ekstraktih. Rezultati so pokazali da je propan boljše topilo za diestre luteina kot $CO_2$, njegova topnostna moč je približno 3,5 krat višja od $CO_2$. Difuzivnost luteinskih diestrov med ekstrakcijo cvetov žametnice smo izračunali z uporabo modela, ki temelji na 2. Fickovem zakonu in sicer za dve stopnji ekstrakcije: stopnjo konstantne ekstrakcijske hitrosti, ki ji sledi stopnja padajoče ekstrakcijske hitrosti. Matematični model na osnovi 2. Fickovega zakona je dobro opisal eksperimentalne ekstrakcijske podatke. lutein diesters Tagetes errecta extraction supercritical $CO_2$ subcritical propane diestri luteina Tagetes erecta ekstrakcija superkritični $CO_2$ subkritični propan true false true Angleški jezik Slovenski jezik Znanstveno delo 2015-07-10 17:31:18 2015-07-10 17:31:18 2022-06-01 03:06:07 2022-03-30 03:07:29 2010 0 0 str. 60-65 št. 1 Letn. 57 2010 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1318-0207 664.87.061-987 14086149 14011158 1318-0207 URN:SI:UM:DK:O0YMMPWX Acta_Chimica_Slovenica_2010_Skerget_et_al._Extraction_of_lutein_diesters_from_Tagetes_erecta_using_supercritical_CO2_and_liquid_propane.pdf Acta_Chimica_Slovenica_2010_Skerget_et_al._Extraction_of_lutein_diesters_from_Tagetes_erecta_using_supercritical_CO2_and_liquid_propane.pdf 1 CA880181CF9A625800BF1CCB81ABBD12 b6048da257883d591854c275cdafb6c4c54a6f886077039b3a3ada5fc67b860c 8793fef5-7c0e-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=115521 http://acta-arhiv.chem-soc.si/57/57-1-060.pdf 1 https://dk.um.si/Dokument.php?lang=slv&id=76938 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0