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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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Prediction of Walnut Deterioration Using Kernel Oxidative Stability.

Filipa Simoes Grilo1, Yanisa Srisaard1, Selina C Wang1,2

  • 1Department of Food Science and Technology, University of California, Davis, CA 95616, USA.

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|September 5, 2020
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Summary
This summary is machine-generated.

Optimizing walnut storage involves monitoring oxidation. The study found that an accelerated oxidation method at 110°C with 25 L/h airflow best predicts walnut kernel oxidative stability and quality.

Keywords:
Rancimathexanalperoxide valueranciditysensory evaluationstorage

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Area of Science:

  • Food Science
  • Agricultural Science
  • Analytical Chemistry

Background:

  • Walnut quality control during storage relies on monitoring oxidation.
  • Oxidative stability is a key indicator of walnut shelf-life and quality.

Purpose of the Study:

  • To evaluate an accelerated oxidation method for determining the oxidative stability index (OSI) of walnut kernels.
  • To assess the impact of operational parameters (temperature, airflow) on OSI measurements.
  • To correlate OSI values with various quality and oxidative markers.

Main Methods:

  • Four walnut cultivars (Chandler, Solano, Durham, Howard) were analyzed.
  • Accelerated oxidation was performed at temperatures of 110, 120, and 130°C with airflow rates of 15, 20, and 25 L/h.
  • Results were correlated with fat, moisture, peroxide value, UV absorbance, oil stability, hexanal, and rancidity.

Main Results:

  • The optimal parameters for minimizing variance were 110°C with 25 L/h airflow (CV=4.4).
  • Higher airflow at 110°C resulted in lower variance compared to lower airflow.
  • Kernel OSI values were independent of airflow but dependent on temperature and Q10.

Conclusions:

  • An accelerated oxidation method using 0.5g ground kernels at 110°C with 25 L/h airflow provides reliable OSI measurements.
  • This method demonstrates a strong correlation with walnut kernel quality and oxidative markers.
  • The findings support the use of this optimized method for quality control in walnut storage.