259217.fig.005
Figure 5: Negative ion nanospray spectra of the green tea extract. Spectrum (a) is the total extract recorded over a wide m/z range. Spectrum (b) is an enlargement of (a) to show the peak at m/z 301 at approximately 2% of the intensity of the most intense ion in spectrum (a). Spectrum (c) is the product ion spectrum of m/z 301 which clearly demonstrates the sensitivity of the technique.