Abstract
Kohlrabi (Brassica oleracea var. gongylodes) is a dietary Brassica vegetable with noted health-beneficial properties associated with its numerous metabolites. The aim of this study was to elucidate phenotypic variation between the two cultivars through comprehensive analysis of the relationship of their primary and secondary metabolites. High-performance liquid chromatography (HPLC) and gas chromatography time-of-flight mass spectrometry (GC-TOFMS) are considered useful tools for profiling primary and secondary metabolites. A total of 45 metabolites, including organic acids, amino acids, sugars, and an amine, were identified in pale green and purple kohlrabies using GC-TOFMS-based metabolic profiling. The resulting data sets were analyzed by principal component analysis to determine the overall variation, and the purple and pale green vegetables were separated by the score plots generated. Additionally, HPLC analysis of anthocyanins in both cultivars revealed that green kohlrabies did not contain any anthocyanidins, while 11 anthocyanins were quantified in the purple ones. Cyanidin was the dominant anthocyanin found in the purple cultivar, with cyanidin-3-(feruloyl)-diglucoside-5-glucoside being the major one. This study suggests that GC-TOFMS and HPLC are suitable tools to determine metabolic connection among various metabolites and describe phenotypic variation between green and purple kohlrabies.
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Change history
21 May 2018
Unfortunately, in the online published article, the second author’s given name was wrongly published. The correct given name should be “Hyeon Ji”.
Similarly the fourth author’s given name and family name was swapped. The given name should be “Ye Eun” and family name should be “Park”.
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Acknowledgments
This research was supported by Agriculture, Food and Rural Affairs Research Center Support Program, Ministry of Agriculture, Food and Rural Affairs and Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry and Fisheries (IPET) through Agri-Bio Industry Technology Development Program, funded by Ministry of Agriculture, Food and Rural Affairs (MAFRA) (316006-5).
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Chang Ha Park and Hyun Ji Yeo have contributed equally to this work.
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Park, C.H., Yeo, H.J., Kim, N.S. et al. Metabolic profiling of pale green and purple kohlrabi (Brassica oleracea var. gongylodes). Appl Biol Chem 60, 249–257 (2017). https://doi.org/10.1007/s13765-017-0274-z
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DOI: https://doi.org/10.1007/s13765-017-0274-z