Determination of steroid hormones in milk using aqueous two-phase extraction coupled to liquid chromatography

2015 ◽  
Vol 7 (6) ◽  
pp. 2514-2522 ◽  
Author(s):  
Na Li ◽  
Xiao Yang ◽  
Li Nian ◽  
Zhibing Wang ◽  
Lei Lei ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
Steroid Hormones ◽  
Phase System ◽  
Phase Extraction ◽  
Two Phase ◽  
Aqueous Two Phase System ◽  
Aqueous Two Phase Extraction

An acetonitrile (ACN)-salt based aqueous two-phase system was developed and applied to the extraction of steroid hormones in milk.

Aqueous Two-Phase Extraction of Potassium Glycyrrhizinate with Polyethylene Glycol/(NH4)2SO4

2012 ◽  
Vol 550-553 ◽  
pp. 1687-1690
Author(s):  
Chen Sun ◽  
Wen Ju Liu ◽  
Hai Ming Zhang
Keyword(s):  
Polyethylene Glycol ◽  
Mass Fraction ◽  
Ph Value ◽  
Phase System ◽  
Phase Extraction ◽  
Two Phase ◽  
Aqueous Two Phase System ◽  
Result Show ◽  
A New Technique ◽  
Aqueous Two Phase Extraction

An aqueous two-phase system of polyethylene glycol (PEG)/(NH4)2SO4 with the behavior of forming aqueous two-phase and the distribution rules of potassium glycyrrhizinate in the aqueous two-phase system were studied. Effects of the molecular weight of PEG, the mass fraction of PEG and (NH4)2SO4, and pH value were investigated. The result show that when the mass fraction of PEG1000 was 50%, the mass fraction of (NH4)2SO4 was 5.7%, and pH value was 6.5, the highest extraction recovery of potassium glycyrrhizinate could reach 99.7%. This aqueous two-phase extraction may provide a new technique for separation of potassium glycyrrhizinate.

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