Extraction-Free, Direct Determination of Caffeine in Microliter Volumes of Beverages by Thermal Desorption-Gas Chromatography Mass Spectrometry

<div>Effect of introduced sample volume on the resulting full-scan caffeine GC/MS response. Numbers represent sample volume in <i>μ</i>L. Insert plot of peak area vs. sample volume.</div>

International Journal of Analytical Chemistry

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Figure 1

Figure 1: Extraction-Free, Direct Determination of Caffeine in Microliter Volumes of Beverages by Thermal Desorption-Gas Chromatography Mass Spectrometry 

Figure 1 | Extraction-Free, Direct Determination of Caffeine in Microliter Volumes of Beverages by Thermal Desorption-Gas Chromatography Mass Spectrometry 