Discrimination of cultivated regions of soybeans (Glycine max) based on multivariate data analysis of volatile metabolite profiles

So Yeon Kim, So Young Kim, Sang Mi Lee, Do Yup Lee, Byeung Kon Shin, Dong Jin Kang, Hyung Kyoon Choi, Young Suk Kim

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The formation of volatile compounds in soybeans is influenced by the cultivar as well as environmental factors, such as the climate and soil in the cultivation areas. This study used gas chromatography-mass spectrometry (GC-MS) combined by headspace solid-phase microextraction (HS-SPME) to analyze the volatile compounds of soybeans cultivated in Korea, China, and North America. The multivariate data analysis of partial least square-discriminant analysis (PLS-DA), and hierarchical clustering analysis (HCA) were then applied to GC-MS data sets. The soybeans could be clearly discriminated according to their geographical origins on the PLS-DA score plot. In particular, 25 volatile compounds, including terpenes (limonene, myrcene), esters (ethyl hexanoate, butyl butanoate, butyl prop-2-enoate, butyl acetate, butyl propanoate), aldehydes (nonanal, heptanal, (E)-hex-2-enal, (E)-hept-2-enal, acetaldehyde) were main contributors to the discrimination of soybeans cultivated in China from those cultivated in other regions in the PLS-DA score plot. On the other hand, 15 volatile compounds, such as 2-ethylhexan-1-ol, 2,5-dimethylhexan-2-ol, octanal, and heptanal, were related to Korean soybeans located on the negative PLS 2 axis, whereas 12 volatile compounds, such as oct-1-en-3-ol, heptan-4-ol, butyl butanoate, and butyl acetate, were responsible for North American soybeans. However, the multivariate statistical analysis (PLS-DA) was not able to clearly distinguish soybeans cultivated in Korea, except for those from the Gyeonggi and Kyeongsangbuk provinces.

Original languageEnglish
Article number763
JournalMolecules
Volume25
Issue number3
DOIs
StatePublished - 10 Feb 2020

Keywords

  • Gas chromatography-mass spectrometry
  • Origin discrimination
  • Solid-phase microextraction
  • Soybean
  • Volatile compounds

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