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Softwoods and Hardwoods01:28

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Volatile components of green walnut husks.

R G Buttery1, D M Light, Y Nam

  • 1U.S. Department of Agriculture, Agricultural Research Service, Western Regional Research Center, Albany, California 94710, USA.

Journal of Agricultural and Food Chemistry
|July 18, 2000
PubMed
Summary
This summary is machine-generated.

Volatile compounds in green walnuts were identified. Codling moth infestation altered the volatile profile, increasing specific compounds and introducing new ones not found in healthy nuts.

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Area of Science:

  • Agricultural Chemistry
  • Plant Biochemistry
  • Entomology

Background:

  • Green walnuts emit volatile organic compounds (VOCs) that can be influenced by environmental factors and biological interactions.
  • Understanding these VOCs is crucial for pest management and quality assessment in walnut production.

Purpose of the Study:

  • To identify and quantify volatile compounds from green walnuts (Hartley variety) with intact husks.
  • To compare the volatile profiles of healthy green walnuts with those infested by codling moth.
  • To analyze volatiles from green walnuts at different maturity stages.

Main Methods:

  • Dynamic headspace sweeping with Tenax trapping was used for volatile isolation.
  • Gas chromatography-mass spectrometry (GC-MS) was employed for compound identification.
  • Analysis included comparison between infested and healthy green walnuts, and across maturity stages.

Main Results:

  • Forty-five volatile compounds were identified in green walnuts.
  • Codling moth infestation significantly increased emissions of specific terpenes and other compounds like (E)-4,8-dimethyl-1,3,7-nonatriene and (E,E)-4,8,12-trimethyl-1,3,7,11-tridecatetraene.
  • Infested walnuts uniquely emitted benzyl methyl ether, isobutyl cyanide, and 1-nitro-3-methylbutane.

Conclusions:

  • The volatile profile of green walnuts is significantly altered by codling moth infestation.
  • Specific VOCs can serve as indicators of codling moth presence in green walnuts.
  • Further research can explore the role of these volatiles in walnut-pest interactions.