| Abstract
| - Four norisoprenoids, α-ionone, β-ionone, β-cyclocitral, and β-damascenone, along with their putativecarotenoid precursors, were identified in Valencia orange juice using time-intensity GC-O, GC-MS,and photodiode array HPLC. α-Ionone and β-cyclocitral are reported in orange juice for the first time.GC-O aroma peaks were categorized into seven groups with similar sensory qualities: citrus/minty,metallic/mushroom/geranium, roasted/cooked/meaty/spice, fatty/soapy/green, sulfury/solventy/medicine, floral, and sweet fruity. The four norisoprenoids contributed approximately 8% of the totalaroma intensity and 78% of the total floral aroma category. The putative carotenoid norisoprenoidprecursors, α- and β-carotene, α- and β-cryptoxanthin, and neoxanthin, were identified in the sameorange juice using photodiode array HPLC retention times and spectral characteristics. Keywords: SPME; GC-O; HPLC; MS; carotenoid degradation; citrus; aroma activity
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