Title: Alteration of 'Granny Smith' Apple Peel Metabolic Profiles by Postharvest UV/Visable Irradiation Authors
Submitted to: American Society of Horticulture Science Meeting
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: March 10, 2007
Publication Date: July 15, 2007
Citation: Rudell Jr, D.R., Mattheis, J.P. 2007. Alteration of 'Granny Smith' Apple Peel Metabolic Profiles by Postharvest UV/Visable Irradiation. American Society of Horticulture Science Meeting. Technical Abstract: Light exposure stimulates an array of responses in apple peel including photosynthesis and pigment metabolism. While the specifics of many metabolic processes stimulated by light are known, impacts of light on primary metabolism in apple peel are relatively uncharacterized. ‘Granny Smith’ apples, grown under conditions where sunlight was delimited from the fruit surface using commercial apple bags, were harvested pre-climacteric and then exposed to a mixture of UV and visible light. Peel samples from the exposed side of light-treated as well as unirradiated control fruit were analyzed using GC/MS following methoxamination and trimethylsilation of methanolic extract residues. Results demonstrate that a large variety compounds including amino acids, organic acids, mono-, di-, and tri-saccharides, sugar acids and alcohols, phenylpropanoids, and sterols can be routinely assayed in apple peel. Measurement of these components periodically during a 48 h irradiation period reveals diverse interactions within this metabolite pool in relation to anthocyanin accumulation.