title: A novel multiple headspace extraction gas chromatographic method for measuring the diffusion coefficient of methanol in water and in olive oil.
abstract: 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.
authors: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China.
authors: Chun-Yun
authors: CY
authors: Zhang
authors: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China. Electronic address: xschai@gmail.com.
authors: Xin-Sheng
authors: XS
authors: Chai
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000379:methods*; D002849:Chromatography, Gas; D000432:Methanol / Q000032:analysis* / Q000737:chemistry; D000069463:Olive Oil; D010938:Plant Oils / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D000069463:Olive Oil; D010938:Plant Oils; D014867:Water; D000432:Methanol
keywords: Diffusion coefficient; Food simulant; Gas chromatography; Methanol; Multiple headspace extraction