Abstract
Changes in pigment concentrations associated with sunburn were studied by taking peel disks from the sunburned area (SB-2), the area around the sunburned area (halo), the area around the halo (OH), and the center of the sun-exposed side of non-sunburned (NB) ‘Fuji’, ‘Gala’, ‘Delicious’, ‘Golden Delicious’, and ‘Granny Smith’ apples ( Malus domestica Borkh). Idaein concentrations in the red cultivars (i.e. ‘Fuji’, ‘Gala’, and ‘Delicious’) decreased from NB to OH to halo to SB-2. Total quercetin glycosides increased from OH to halo to SB-2 in all cultivars except ‘Delicious.’ Chlorogenic acid (CA) concentrations were typically highest in the SB-2 peel and lowest in NB, except in ‘Granny Smith’ where no CA was detected in any peel type.
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