Enhanced extraction of astaxanthin using aqueous biphasic systems composed of ionic liquids and potassium phosphate. (30th March 2020)

• Record Type: Journal Article
• Authors: Gao, Jing; Fang, Chunli; Lin, Yongzi; Nie, Fanghong; Ji, Hongwu; Liu, Shucheng
• Is Part Of: Food chemistry. Volume 309(2020)
• Publication Date: 2020-03-30
• Subjects: Aqueous biphasic system -- Ionic liquid -- Astaxanthin -- Extraction -- Shrimp waste; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2019.125672
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: LCST-type ABS were prepared using phosphonium- and ammonium-based ILs and K3 PO4 . The ABS were applied to extract astaxanthin from shrimp waste. [P4448 ]Br + K3 PO4 ABS achieved highest extraction efficiency of 93.08% at 308 K. Lower temperature are favourable for astaxanthin extraction. Hydrogen bond basicity of ILs can explain the partition behavior of molecule in ABS. Abstract: Shrimp waste containing a substantial amount of valuable nutrients presents a challenge for food industry. In this work, extraction of astaxanthin from shrimp waste via aqueous biphasic systems (ABS) composed of ionic liquids (ILs) and potassium phosphate (K3 PO4 ) was investigated. The influence of phosphonium- and ammonium-based ILs and temperature on the phase behavior and astaxanthin extraction was evaluated. The hydrogen-bond basicity of each IL studied shows a negative linear correlation with tie-line lengths of ABS and a positive linear correlation with extraction efficiency ( EE Ast ). In general, lower temperature are favourable for astaxanthin extraction. Tributyloctylphosphonium bromide ([P4448 ]Br) resulted in the strongest ABS formation ability and bonding interactions between the anion and astaxanthin. Compared with organic solvents, [P4448 ]Br + K3 PO4 ABS achieved higher EE Ast of 93.08% at 308 K. The chemical properties provide the possibility of prescreening appropriate ILs for ABS formation and predicting the partition of a target molecule.