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Assessment of matrix effect in quantitative analysis of acrylamide in teas based on LC-MS/MS

Assessment of matrix effect in quantitative analysis of acry...

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中国食品科学技术学会第五届年会暨第四届东西方食品业高层论坛

作者： jie liu fangchen ganghuazhao xiaosong hu yuan yuan (College of Food Science & Nutritional Engineering,China Agricultural University,Beijing 100083,China)

A liquid chromatography-tandem mass spectrometry(LC-MS/MS)method was developed for the quantitative analysis of acrylamide in tea samples.13C3-labelled acrylamide was used as internal *** was extracted at 25℃ for 20 min by I0 ml water in an incubated horizontal shaker, and then 10 ml acetonitrile,4 g of magnesium sulfate and 0.5 g of sodium chloride were added into the aqueous extract and mixed *** salt combination induced separation of water and acetonitrile layers and forced the majority of acrylamide into the acetonitrile layer.9 ml acetonitrile was taken and concentrated to 0.5 *** single Oasis MCX solid-phase extraction(SPE)was carried out for clean-up. The final extract was analyzed by LC-MS/MS in positive ionization *** standard lines were prepared in different systems of standard solutions to evaluate the presence of matrix effect,assay accuracy,precision,and *** first system was prepared to evaluate the MS/MS response for neat standards of two analytes(acrylamide and 13C3-labelled acrylamide).The second system was prepared in tea extracts spiked two analytes after *** third system was prepared in tea extracts spiked two analytes before *** results showed that acrylamide and 13C3-labelled acrylamide had different matrix effect exhibiting ion suppression(92%)and ion enhancement(102%), *** recovery efficiency of the acrylamide and 13C3-labelled acrylamide agreed with each other(76%),while the overall process efficiencies containing matrix effect were different(69% and 78%,respectively).The levels of acrylamide of all tea samples were less than 100 ng/***,oolong, white and yellow tea samples had quite low acrylamide content(＜20 ng/g).High acrylamide levels occurred in baked,roasted,and one sun-dried green tea samples(46-94 ng/g).

关键词： Acrylamide Tea Liquid chromatography-mass spectrometry Quantitative anlaysis Matrix effect

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