A novel multiple headspace extraction gas chromatographic method for measuring the diffusion coefficient of methanol in water and in olive oil

作者：Zhang, Chun Yun; Chai, Xin Sheng^*

来源：Journal of Chromatography A, 2015, 1385: 124-128.

DOI：10.1016/j.chroma.2015.01.073

• Methanol
• Diffusion coefficient
• Multiple headspace extraction
• Food simulant
• Gas chromatography

A novel method for the determination of the diffusion coefficient (D) of methanol in water and olive oil has been developed. Based on multiple headspace extraction gas chromatography (MHE-GC), the methanol released from the liquid sample of interest in a closed sample vial was determined in a stepwise fashion. A theoretical model was derived to establish the relationship between the diffusion coefficient and the GC signals from MHE-GC measurements. The results showed that the present method has an excellent precision (RSD < 1%) in the linear fitting procedure and good accuracy for the diffusion coefficients of methanol in both water and olive oil, when compared with data reported in the literature. The present method is simple and practical and can be a valuable tool for the determination of the diffusion coefficient of volatile analyte(s) into food simulants from food and beverage packaging material, both in research studies and in actual applications.

• 出版日期2015-3-13
• 单位制浆造纸工程国家重点实验室; 华南理工大学