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| Quantitative analysis method of volatile organic compounds in vegetable oil based on gas chromatography-ion mobility spectrometry |
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Received:July 15, 2025 Revised:March 03, 2026 Accepted:August 13, 2025
Published：
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| DOI：10.19902/j.cnki.zgyz.1003-7969.250333 |
| KeyWord:GC-IMS internal standard method volatile organic compounds quantitative analysis |
| FundProject: |
| Author Name | Affiliation | | REN Lingyun1, DONG Bin1, JIANG Yuanyuan1, YANG Linlin1, LIU Wenzhe1,
ZHANG Jinna2, WANG Feifei2 | 1.Shandong Grain and Oil Testing Center,Jinan 250012,China
2.Shandong Luliang
Testing Technology Co. , Ltd. , Jinan 250012, China |
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| Abstract: |
| To enable the visualization of differences in volatile organic compounds (VOCs) content in vegetable oils, a quantitative analysis method based on gas chromatography-ion mobility spectrometry (GC-IMS) was established using different types of vegetable oils as experimental materials. Orthogonal experiments were conducted to optimize the GC-IMS pretreatment conditions. Internal standards for quantification were selected and validated, their detection limits were determined, and recovery rates were assessed through spiking experiments. On this basis, OPLS-DA models were employed to screen, quantify, and differentiate the characteristic VOCs of various vegetable oils. The results showed that the optimal pretreatment conditions for GC-IMS were obtained as follows: sample amount 1.000 g, incubation temperature 80 ℃, incubation time 10 min, and injection volume 500 μL. For compounds with a retention index below 900, isobutyl acetate was used as the internal standard, while for those with a retention index above 900, ethyl hexanoate was used. The detection limits of isobutyl acetate and ethyl hexanoate were 0.008 mg/kg and 0.023 mg/kg, respectively. The accuracy and precision of the method met the requirements of the national standard. The five vegetable oils contained 77 VOCs belonging to 10 categories, demonstrating good overall representativeness. Based on a VIP greater than 1,22 VOCs from 8 categories were screened and quantified, revealing significant differences in VOCs content among the oils. In conclusion, this method features clear substance peak boundaries, good resolution, accurate internal standard quantification, strong operability, and high stability, making it suitable for the analysis of VOCs in different types of vegetable oils. |
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