A method is established for the extraction of synthetic acesulfame K sweetener by an aqueous two-phase system consisting of polyethylene glycol (PEG) 2000-dipotassium hydrogen phosphate.Firstly,the cloud point titration method is employed to compare the phase formation ability of PEG with different relative molecular weight and dipotassium hydrogen phosphate to determine the phase composition.Secondly,the influence of phase forming substances on the absorbance of acesulfame K is evaluated.The extraction capacity of PEG 2000-dipotassium hydrogen phosphate aqueous two-phase system is detected by means of ultraviolet spectrophotometer.It is verified that there is a good linear relationship in the range of 2-20 μg·mL-1,with a correlation coefficient of 0.999.The limit of detection (LOD) and limit of quantitation (LOQ) are 0.33 μg·mL-1 and 1.1 μg·mL-1,respectively.The recovery rates of acesulfame K in water samples are 92.4%-95.0% and RSD is 1.4%-1.7%.The method is simple,rapid and easy to operate,which provides a theoretical basis for the detection of acesulfame K in foodstuffs and in the environment.
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