eprintid: 15706 rev_number: 2 eprint_status: archive userid: 1 dir: disk0/00/01/57/06 datestamp: 2023-11-10 03:30:20 lastmod: 2023-11-10 03:30:20 status_changed: 2023-11-10 02:00:10 type: article metadata_visibility: show creators_name: Idham, Z. creators_name: Putra, N.R. creators_name: Idrus, N.F.M. creators_name: Mili, N. creators_name: Ruslan, M.S.H. creators_name: Rasidek, N.A.M. creators_name: Yunus, M.A.C. title: Characteristics and Empirical Modelling of Extract from Hibiscus sabdariffa Using Supercritical CO2 Extraction with Ethanol-Water as Modifier ispublished: pub keywords: Anthocyanins; Color; Plant extracts; Regression analysis; Supercritical fluid extraction; Toxic materials, Characteristic model; Empirical model; Ethanol-water; Hibiscus sabdariffa; Natural red; Red color; S models; SC CO 2; Supercritical carbondioxides; Supercritical CO 2, Carbon dioxide note: cited By 1; Conference of 3rd International Conference on Separation Technology, ICoST 2020 ; Conference Date: 15 August 2020 Through 16 August 2020; Conference Code:261289 abstract: The main constituents of the extract from Hibiscus sabdariffa calyces are anthocyanins which gave intense natural red colorant and commonly used for centuries for therapeutic purposes. Supercritical carbon dioxide (SC-CO2) technique could produce high-quality extracts from plant materials as it can exploit the non-toxic character and the gasâ��liquid properties of the SC-CO2. This research aimed to characterise the colour and the pattern of Hibiscus sabdariffa SC-CO2 extraction. The colour was evaluated by using a CIELAB method meanwhile the presence of anthocyanins in the red colour extract was confirmed by High-Performance Liquid Chromatograph (HPLC). Two types of empirical models (Modified Brunnerâ��s and Esquivelâ��s models) were used to describe the extracts obtained at series of operational parameters (i.e. pressure and temperature) at 7.5 and 10 of modifier ratio, with a total solvent flow rate of 4 ml/min. Both models were analysed using a non-linear regression method. The modified Brunnerâ��s model shows the best agreement between experimental and model calculated data with the lowest AARD of 1.30 at 70 °C, 10 MPa, and 10 modifier ratio. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. date: 2021 publisher: Springer Science and Business Media Deutschland GmbH official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85111357274&doi=10.1007%2f978-981-16-0742-4_26&partnerID=40&md5=e6c996cb9759345b712f3511d15cfc3d id_number: 10.1007/978-981-16-0742-4₂₆ full_text_status: none publication: Lecture Notes in Mechanical Engineering pagerange: 375-388 refereed: TRUE isbn: 9789811607417 issn: 21954356 citation: Idham, Z. and Putra, N.R. and Idrus, N.F.M. and Mili, N. and Ruslan, M.S.H. and Rasidek, N.A.M. and Yunus, M.A.C. (2021) Characteristics and Empirical Modelling of Extract from Hibiscus sabdariffa Using Supercritical CO2 Extraction with Ethanol-Water as Modifier. Lecture Notes in Mechanical Engineering. pp. 375-388. ISSN 21954356