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China Surfactant Detergent & Cosmetics ›› 2023, Vol. 53 ›› Issue (9): 1108-1114.doi: 10.3969/j.issn.2097-2806.2023.09.016

• Analytical methods and testing • Previous Articles    

Determination of thiazolidinones in oral care products by ultra performance liquid chromatography

Song Qingmei1,*(),Du Feng2   

  1. 1. Puyang Medical College, Puyang, Henan 457000, China
    2. Puyang Peaple's Hospital, Puyang, Henan 457000, China
  • Received:2023-04-24 Revised:2023-09-06 Online:2023-09-22 Published:2023-09-26
  • Contact: * Tel.: +86-13939338111, E-mail: 154452708@qq.com.

Abstract:

The purpose of this paper is to determine the content of isothiazolinones in oral care products by ultra performance liquid chromatography. A HyperSep reversed-phase C8/BSAIE ion exchanger, solid phase extraction (SPE) with Sep-Pak C18 sorbent and an ultra performance liquid chromatography/diode array detector (UPLC/DAD) were used for the simultaneous determination of methylisothiazolinone (MI) and methylchloroisothiazolinone (MCI) in oral care products. The results find that the eluting solvents for HyperSep C8/BSAIE and UPLC/DAD are mixtures (acetonitrile/methanol, volume ratio 2:1) with an optimum detection wavelength of 255 nm. The method has a good linear range (0.005-10 µg/mL), the coefficient of determination (R2) ranges from 0.997 to 0.999, and the limit of detection (LOD) is in the range of 0.001-0.002 µg/g. The relative standard deviation RSD is less than 3% for the detection of standard mixtures at low (0.07 µg/mL), medium (3 µg/mL) and high (15 µg/mL) concentrations. A total of 12 oral care samples are studied, with the reaching concentrations of nd-0.89 µg/g for MI and nd-0.62 µg/g for MCI. Recoveries range from 95.33% to 101.43% depending on the type of sample.

Key words: isothiazolinone, parabens, cosmetics, solid phase extraction, ultra performance liquid chromatography

CLC Number: 

  • TQ658