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Citation: FENG Feng, FAN Guang-Yu, LIU Tong, ZHANG Feng. Determination of Short-chain Fatty Acids in Well and Rock Salt by Headspace Gas Chromatography-Mass Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(2): 244-248. doi: 10.19756/j.issn.0253-3820.181097 shu

Determination of Short-chain Fatty Acids in Well and Rock Salt by Headspace Gas Chromatography-Mass Spectrometry

1.
Institute of Food Safety, Chinese Academy of Inspection and Quarantine, Beijing 100176, China;
2.
Lianyungang Entry-exit Inspection and Quarantine Bureau, Lianyungang 222042, China

Received Date: 5 May 2018
Revised Date: 14 December 2018

Fund Project: This work was supported by the National Key Research and Development Program of China (No. 2017YFF0211000).

A method of headspace gas chromatography-mass spectrometry (HS-GC/MS) for simultaneous qualitative and quantitative analysis of off-flavour in well and rock salt was developed. For qualitative analysis, the sample were analyzed by headspace injection, then separated by a HP-innoWax column (60 m×0.25 mm×0.25 μm), and detected under electron ionization using scan mode, based on the NIST database retrieval and double column confirmed using standards, 13 and 5 kinds of short-chain fatty acids(SCFAs) were identified in the raw brine samples and finished smelled salt respectively. For the purpose of quantitative analysis short-chain fatty acids in finished salt, a selected ion monitor mode and external standard with matrix matched method was used. The result demonstrated that good linear relationships in the range of 0.13-5 mg/kg were obtained and the correlation coefficients (R²) of the 5 SCFAs were greater than 0.995. The limits of detection (LODs, S/N=3) ranged from 0.05 to 0.20 mg/kg. The mean recoveries varied from 82% to 104% at spiked levels of 0.25, 0.5 and 2.5 mg/kg, and the relative standard deviations (RSDs) ranged from 5.1% to 9.8% (n=6). The proposed method is simple and sensitive for simultaneous determination of SCFAs in well and rock salt.
- Headspace injection,
- Gas chromatography-mass spectrometry,
- Well and rock salt,
- Short-chain fatty acids
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