Quantification of β-carotene, retinol, retinyl acetate and retinyl palmitate in enriched fruit juices using dispersive liquid-liquid microextraction coupled to liquid chromatography with fluorescence detection and atmospheric pressure chemical ionization-mass spectrometry

1. Viñas, P.
2. Bravo-Bravo, M.
3. López-García, I.
4. Hernández-Córdoba, M.