Monitoring metabolic changes during storage of hazelnuts (Corylus avellana L.) by 1H NMR spectroscopy

18 May 2022, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

Storage is a critical step in post-harvest processing of hazelnuts since it can lead to mold, rancidity and off-flavor. To comprehensively investigate the effects of hazelnut storage, samples were stored under three short-term and two long-term conditions and the polar metabolome was analyzed by 1H NMR spectroscopy at different timepoints. Large differences in the polar metabolome were observed between the investigated storage conditions. Classification between samples pre- and post-storage showed that samples stored under harsh conditions for a short period and under standard conditions long-term were almost always classified correctly. Boruta, a feature selection algorithm, was used to select metabolites important for classification. Increases in hexanoic, octanoic, and nonanoic acid, all products of lipid oxidation, were found across all conditions and an increase in formic acid in most. Harsh short-term storage resulted in increases in fumaric and lactic acid, glucose, fructose and choline and a decrease in acetic acid.

Keywords

1H NMR
metabolomics
ageing
lipid oxidation
feature selection
chemometrics

Supplementary materials

Title
Description
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Title
Monitoring metabolic changes during storage of hazelnuts (Corylus avellana L.) by H NMR spectroscopy
Description
Bins selected by Boruta as well as further classification and regression results are presented in the Supplementary Material.
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