Figure 2.

Typical IMS spectra of zeaxanthin and lutein with acetonitrile/methanol 70:30 APPI solvent conditions and various additives (from top to bottom): [M + H]⁺ zeaxanthin with acetone, [M]⁺ zeaxanthin with anisole, [M]⁺ zeaxanthin with toluene, and [M – 18]⁺ lutein with anisole. IMS peaks A–F have been designated in the spectra and are depicted using Gaussian profiles.