Determination of propionic acid and its salts in cakes by liquid-liquid extraction-GC-MS combined with dual enzymatic hydrolysis

  • WANG Yu ,
  • ZHONG Yuxin ,
  • CHEN Yueming ,
  • HUANG Jingchu ,
  • CHEN Sui ,
  • SU Yanyu ,
  • CHEN Jiaxin ,
  • CAI Weiyi
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  • 1(Guangzhou Institute for Food Inspection,Guangzhou 511400,China)
    2(Guangdong Meiweixian Flavoring Foods Co.Ltd.,Zhongshan 528437,China)

Received date: 2020-12-17

  Revised date: 2021-02-02

  Online published: 2021-08-20

Abstract

A gas chromatography-mass spectrometry using liquid-liquid extraction combined with dual enzymatic hydrolysis for determination of propionic acid in cakes was developed successfully.The sample was hydrolyzed in phosphate buffer at 37 ℃ to remove protein and starch.Propionic acid was converted to ionic state while the pH of hydrolyzed solution was adjusted to pH>10.Non-polar impurities were removed by ether extraction.Propionic acid was converted to molecular state by adjusting the aqueous phase pH<4. The propionic acid was extracted by ethyl acetate in order to remove polar impurities.The target analyte were separated on DB-WAX capillary column (30 m×0.25 mm,0.25 μm),and detected by gas chromatography-mass spectrometry.The results indicated that the calibration curve for propionic acid was linear in the range of 0.1-20 μg/mL with the correlation coefficient of 1.000.The spike recoveries were 83%-109%,RSD<7%.The detection limit was 0.450 mg/kg.The developed method has the advantages of simple pretreatment,high sensitivity,accuracy and fast.

Cite this article

WANG Yu , ZHONG Yuxin , CHEN Yueming , HUANG Jingchu , CHEN Sui , SU Yanyu , CHEN Jiaxin , CAI Weiyi . Determination of propionic acid and its salts in cakes by liquid-liquid extraction-GC-MS combined with dual enzymatic hydrolysis[J]. Food and Fermentation Industries, 2021 , 47(14) : 257 -263 . DOI: 10.13995/j.cnki.11-1802/ts.026494

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