Characterisation of Asturian cider apples on the basis of their aromatic profile by high-speed gas chromatography and solid-phase microextraction

Development of an isotope-dilution gas chromatographic-mass spectrometric method for the analysis of polycyclic aromatic compounds in environmental matrices

A simple and fast method based on solid-phase microextraction (SPME) followed by fast gas chromatography (Fast GC) has been developed for the analysis of volatile compounds in Asturian apple juices employed in the cider production. Three different fiber coatings have been checked (PDMS, PDMS-DVB and CAR-PDMS) and PDMS-DVB has been presented to be the most suitable one. Experimental design has been employed in the optimization of extraction factors and robustness assessment. The use of Fast GC allowed the separation of 14 compounds (esters, aldehydes and alcohols) in approximately 4 min, clearly reducing the analysis time when compared to conventional GC. Good linearity, recoveries and repeatability of the solid-phase microextraction were obtained with r 2 values, recoveries and relative standard deviations ranging from 0.9822 to 0.9998, 83.2 to 109.8% and 0.5 to 11.7%, respectively, using standard solution.

Experimental design applied to the analysis of volatile compounds in apple juice by headspace solid-phase microextraction

A novel method for the determination of total 1,3-octanediols in apple juice via 1,3-dioxanes by solid-phase microextraction and high-speed gas chromatography.

This chapter describes analytical chemical methods used to characterize high-mass materials found in liquids and tars from coal processing in crude petroleum fractions such as asphaltenes and in liquids from the conversion of biomass into liquid fuels. Methods described include size exclusion chromatography with different solvents, mass spectrometric method including laser desorption, nuclear magnetic resonance, fractionation techniques, vapour pressure osmometry, UV-fluorescence and Fourier Transform infrared spectroscopy. Significant developments in these fields are described. Comparison with Fourier Transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) reveals significant shortcomings with that method in application to petroleum residues. The high-mass components of biomass tars have previously been ignored.

Analytical techniques for high-mass materials: Method development

Analysis of Polycyclic Aromatic Compounds Using Microbore Columns

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Analysis of Polycyclic Aromatic Compounds Using Microbore Columns