Lycopene, mass spectra

Figure F2.4.3 Flow-injection positive ion atmospheric pressure chemical ionization (APCI) mass spectrum of -1 pmol lycopene. The carrier solvent for flow injection analysis consisted of metha-nol/methyl-ferf-butyl ether (50 50 v/v) at a flow rate of 200 ul/min. The lycopene standard was isolated from tomatoes. The a -trans isomer of lycopene is shown, which is the most abundant isomer found in the tomato. This carotene is the familiar red pigment of the tomato.

Figure 13.2. Positive ion APCI mass spectrum of the red carotenoid lycopene in a solution of methanol and tert-butyl methyl ether (1 1 v/v). In this analysis, lycopene formed a protonated molecule instead of a molecular ion.

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