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3-Carotene absorbancy changes absorption bands absorption spectrum acetone acid Acta actinic adsorption affinity aglycones all-trans B. H. Davies beam benzene Biochem biophys Canthaxanthin Capsanthin carbonyl carotenes carotenoids cathode Chem chlorophyll chloroplasts chromatography chromophore column compounds concentration conjugated Cryptoxanthin determination diethyl ether double bonds electric electrochroic electron elution end group energy excitation extraction filter flash lamp flavones flavonoids flavonols fluorescence glycosides Goodwin Harborne hexane hydroxyl groups illustrated in Fig interrogating light Isler isomers Karrer and Jucker kinetic Kj°sen laser layers light petroleum light reaction Lycopene Mabry measuring membrane methanol method methyl mixture molecular molecules oxidation peak pheophytin photomultiplier photosynthesis Phytochemistry phytochrome pigments plastoquinone polar protons pulse quinones R. F. Taylor resonance RF values sample separation shift silica gel solution solvent spectra spectrophotometer spectrum Spruit Stransky and Hager structure Table Taylor and B. H. technique temperature thin-layer voltage wavelength Weedon Witt xanthophylls Yokoyama Zeaxanthin Zechmeister