Abstract
Introduction
The consumption of high quality coffee such as specialty Arabica and fine Robusta coffee is increasing steadily in recent years. Development of single origin coffee is an important strategy to maintain coffee quality, grade and high cupping score. Indonesia is a top exporting country for Arabica coffee with high variety of specialty coffees from different origins. Despite its long standing reputation in global coffee market, very few is known about the variability among Indonesian specialty coffees.
Objectives
This study aims to observe metabolite variability among Indonesian coffees from different species and geographical origins by means of non-targeted GC/MS metabolite profiling.
Methods
Sixty-four compounds were tentatively identified from 16 green and roasted coffee beans from different species and cultivation areas in Indonesia and were subjected to principal component analysis (PCA). Ten Specialty Arabica coffee and five Fine Robusta representing all important high quality coffees of Indonesia were also analyzed independently to further classify Indonesian coffee according to their origin.
Results
PCA results of 16 green and roasted coffee beans of different species and cultivation areas showed that samples were separated along PC1 based on different roasting condition (green and roasted) with 52.9% variance and were separated along PC2 based on different species with 19.3% variance. The result from this study showed the clustering of samples based on three major cultivation areas in Indonesia (western, central, eastern part). Metabolites showing higher concentration in Sulawesi, Papua, Flores and Sumatra samples were glycerol, glucuno-1,5-lactone, gluconic acid and sorbitol. A clear distinction in galactitol and galactinol concentration between all samples from eastern part of Indonesia and western and middle part of Indonesia was also observed.
Conclusions
Our results showed that each region (western, central and eastern part of Indonesia) has signature compounds that may serve as discriminant markers for coffee authentication. This is the first report on the classification of Indonesian specialty coffee based on their metabolic profiles and can act as a basis for marker identification for routine procedures in industry.
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Acknowledgements
The authors thank Indonesian National Commission for UNESCO and L’Oreal Indonesia for the L’Oreal Award for Women in Science funding received by Sastia P. Putri and to Dr. Agung Wahyu Susilo and Dr. Sukrisno Widyotomo of Indonesian Coffee and Cocoa Research Institute for their kind support in this study. The authors also thank Mr. Abu Hanifah for his technical assistance in this study.
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Sastia Prama Putri and Eiichiro Fukusaki conceived and designed the study. Tomoya Irifune and Yusianto performed the experiments and analyzed the data. Sastia Prama Putri wrote the paper. Tomoya Irifune, Yusianto, and Eiichiro Fukusaki revised the manuscript. All authors read and approved the final manuscript.
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Putri, S.P., Irifune, T., Yusianto et al. GC/MS based metabolite profiling of Indonesian specialty coffee from different species and geographical origin. Metabolomics 15, 126 (2019). https://doi.org/10.1007/s11306-019-1591-5
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DOI: https://doi.org/10.1007/s11306-019-1591-5