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Volatile methoxybenzene compounds in grains with off-odors.

L M Seitz1, M S Ram

  • 1U.S. Grain Marketing Research Laboratory, Grain Marketing and Production Research Center, Agricultural Research Service, U.S. Depatment of Agriculture, 1515 College Avenue, Manhattan, Kansas 66502, USA. larry@usgmrl.ksu.edu

Journal of Agricultural and Food Chemistry
|September 20, 2000
PubMed
Summary
This summary is machine-generated.

Volatile methoxybenzene compounds were identified in grain samples, often correlating with off-odors. These compounds may indicate insect presence or spoilage, impacting grain quality.

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Area of Science:

  • Agricultural Chemistry
  • Analytical Chemistry
  • Food Science

Background:

  • Grain quality is crucial for food and feed industries.
  • Off-odors in grains can significantly reduce market value and consumer acceptance.
  • Identification of volatile organic compounds (VOCs) is key to understanding grain spoilage and contamination.

Purpose of the Study:

  • To identify and quantify volatile methoxybenzene compounds in various grain samples.
  • To correlate the presence of specific methoxybenzenes with distinct off-odors in corn, sorghum, soybean, and wheat.
  • To investigate potential origins of these compounds, including insect secretions and microbial activity.

Main Methods:

  • Gas chromatography-mass spectrometry (GC-MS) was employed for separation and identification of volatile compounds.
  • An autosampler was used to purge volatiles from whole grain at 80°C onto a Tenax adsorbent.
  • Thermal desorption and infrared detection aided in the identification of compounds, particularly isomers.

Main Results:

  • Over 20 volatile methoxybenzene compounds were detected in 745 grain samples.
  • Specific methoxybenzenes were associated with insect-like odors (e.g., 1,4-dimethoxybenzene derivatives) and musty/sour/smoke odors (e.g., methoxybenzene, dimethoxybenzenes).
  • Correlations between compound levels and odor types suggest their role as indicators of grain quality issues.

Conclusions:

  • Methoxybenzene compounds are significant contributors to off-odors in stored grains.
  • The identified compounds can serve as biomarkers for insect infestation or spoilage processes.
  • Further research into the biosynthetic pathways and precise origins of these methoxybenzenes is warranted.