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Research Project: ANALYTICAL METHODS FOR THE DETERMINATION OF PHENOLIC PHYTONUTRIENTS IN FOODS

Location: Food Composition and Methods Development Lab

Title: Influence of UV Light on Phenolic Content of Broccoli and Tomato Samples

Author

Submitted to: Meeting Abstract
Publication Type: Abstract
Publication Acceptance Date: April 29, 2008
Publication Date: August 9, 2008
Citation: Luthria, D.L. 2008. Influence of UV Light on Phenolic Content of Broccoli and Tomato Samples. University of Delhi, June 2-7, 2008, Mumbai, India and Khon Kaen University, August 9-15, 2008, Khon Kaen, Thailand.

Technical Abstract: Two cultivars of tomato and broccoli samples were grown in high tunnels covered with two contrasting materials of similar thickness (0.152mm) and durability (4-year polyethylene). One material (Dura-film Super 4) blocked ultraviolet (UV) radiation (< 380 nm) and the other material (Tyco Tufflite IV) transmitted UV radiation. For broccoli, an additional set of field samples was also collected. Four sets of tomato samples and six sets of broccoli samples were collected from each cultivar grown under two or three different conditions: 1) in presence of UV light (UV+), 2) partially blocked ultraviolet light (UV-), and 3) from the field (broccoli only). All samples were assayed for total phenolic (TP) content by a colorimetric Folin-Ciocalteu assay (FC) and phenolic acids by a high performance liquid chromatography-diode array detection (HPLC-DAD) procedure. The amount of phenolic compounds extracted from both broccoli and tomato samples were from 10-20% greater when grown in presence of UV light (UV+) as compared to the high tunnel material that partially blocked UV radiation (UV-). The amount of phenolic phytochemicals in broccoli field samples were similar to those grown in high tunnels that allowed UV light (UV +). These results clearly suggest that UV light has a significant influence on the phenolic content in broccoli and tomatoes.

   

 
Project Team
Luthria, Devanand - Dave
Chen, Pei
Byrdwell, W Craig
Harnly, James - Jim
 
Publications
   Publications
 
Related National Programs
  Human Nutrition (107)
 
Related Projects
   OPTIMIZATION OF SAMPLE PREPARATION FOR ANALYSES OF PHENOLIC COMPOUNDS FROM DIFFERENT MATRICES
   DEVELOPMENT OF A LIBRARY OF SPECTRAL FINGERPRINTS AND CHROMATOGRAPHIC PROFILES OF BOTANICAL MATERIALS
   PATTERN RECOGNITION FOR FOODS AND SUPPLEMENTS
 
 
Last Modified: 11/10/2008
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