Journal
FOOD CHEMISTRY
Volume 295, Issue -, Pages 505-513Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2019.05.143
Keywords
Shiitake; Geographical origin; Stable isotope ratio; Orthogonal projection to latent structure-discriminant analysis
Funding
- R&D project of the National Institute of Horticultural and Herbal Science, Rural Development Administration, South Korea [PJ012585032019]
- Rural Development Administration (RDA), Republic of Korea [PJ012585032019] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The Lentinus edodes species, known as shiitake, has a history of extensive use in many cuisines in several East Asian countries owing to its unique and pleasant flavor and texture. As international food trade increases, reliable discrimination of geographical origin is becoming increasingly crucial in Korea to identify cheaper imported Chinese shiitake. Herein, stable isotope ratios (i.e., delta C-13, delta N-15, delta O-18, and delta S-34) were measured with a stable isotope ratio mass spectrometer, and a geographical discrimination method using orthogonal projection to latent structure-discriminant analysis was developed. The externally validated discrimination method showed excellent predictability (Q(cum)(2) = 0.881) and illustrated that delta O-18 and delta N-15 were important isotope markers for the geographical discrimination of dried shiitake slices. This study extends the knowledge of geographical differences between China and Korea evidenced by the shiitake isotope signatures, thereby contributing to potential geographical authentication with broader applications for international shiitake markets.
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