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Assessment of Antioxidant Properties of Colorado Apples Compared to Competing Production Regions

Project Leader: Jonathan Allen - Colorado Apple Marketing Committee, Hotchkiss, CO

Technical Advisor: Cecil Stushnoff, Department of Horticulture and Landscape Architecture, Colorado State University

Year: 2003

picture from: www.images.google.com

Project Summary

The objective of this project is: to investigate the diversity of antioxidant content in both Colorado and non-Colorado produced apples, to compare antioxidant content in Colorado-produced apples with that found in apples produced in other growing areas, and to determine whether such differences might provide an advantage for promotion of Colorado-produced apples.

Fruit of the following apple cultivars will be obtained from sources in Colorado, Washington, and California: Fuji, Gala, Golden Delicious, Granny Smith, Jonagold, Jonathan, and Pink Lady. Two samples will be analyzed for each location for antioxidant levels, soluble solids, and flesh pressure. A total of 100 samples will be collected and tested at the laboratory at Colorado State University.

The Results

  • The antioxidants found in the Gala apple were significantly higher in the Gala from Paonia, CO. The lowest amounts of antioxidants were found in an apple from Selah, WA. All Colorado sites exceeded CA and WA in soluble solids and flesh pressure.
  • For Golden Delicious, Colorado scored the lowest in antioxidants, with Washington having the most and California having the 2nd most. Olathe had the highest soluble solids, but lowest antioxidants.
  • There were no sources available outside of Colorado for Jonathan apples.
  • WA had the highest antioxidants in Jonagold, but CO (Roger's Mesa) had the highest soluble solids and flesh pressure.
  • For Granny Smith apples, WA had the highest antioxidant and flesh pressure amounts, but the lowest soluble solids.
  • Colorado had the highest antioxidant and soluble solid levels in Fuji apples, but not much higher than WA.
  • Pink Lady had two times the amount of antioxidants and soluble solid levels than CA Pink Lady apples.

Click here for two different Microsoft Power Point presentations summarizing this project:

Colorado State University College of Agricultural Sciences Department of Horticulture and Landscape Architecture