Enhanced extraction of astaxanthin using aqueous biphasic systems composed of ionic liquids and potassiumphosphate

•LCST-type ABS were prepared using phosphonium- and ammonium-based ILs and K3PO4.•The ABS were applied to extract astaxanthin from shrimp waste.•[P4448]Br + K3PO4 ABS achieved highest extraction efficiency of 93.08% at 308 K.•Lower temperature are favourable for astaxanthin extraction.•Hydrogen bond...

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Bibliographic Details
Published in:Food chemistry 2020-03, Vol.309, p.125672-125672, Article 125672
Main Authors: Gao, Jing, Fang, Chunli, Lin, Yongzi, Nie, Fanghong, Ji, Hongwu, Liu, Shucheng
Format: Article
Language:English
Subjects:
Aqueous biphasic system
Astaxanthin
Extraction
Hydrogen-Ion Concentration
Ionic liquid
Ionic Liquids - chemistry
Phosphates - chemistry
Potassium Compounds - chemistry
Shrimp waste
Solvents - chemistry
Temperature
Thermodynamics
Viscosity
Water - chemistry
Xanthophylls - analysis
Xanthophylls - isolation & purification
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Summary:•LCST-type ABS were prepared using phosphonium- and ammonium-based ILs and K3PO4.•The ABS were applied to extract astaxanthin from shrimp waste.•[P4448]Br + K3PO4 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. 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 potassiumphosphate (K3PO4) 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 (EEAst). 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 + K3PO4 ABS achieved higher EEAst 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.
ISSN:0308-8146
1873-7072
DOI:10.1016/j.foodchem.2019.125672