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  • Isotopic and Elemental Composition of Roasted Coffee as a Guide to Authenticity and Origin

    Author(s)
    Carter, James F
    Yates, Hans SA
    Tinggi, Ujang
    Griffith University Author(s)
    Tinggi, Ujang
    Year published
    2015
    Metadata
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    Abstract
    This study presents the stable isotopic and elemental compositions of single-origin, roasted coffees available to retail consumers. The δ(13)C, δ(15)N, and δ(18)O compositions were in agreement with those previously reported for green coffee beans. The δ(15)N composition was seen to be related to organic cultivation, reflected in both δ(2)H and δ(18)O compositions. The δ(13)C composition of extracted caffeine differed little from that of the bulk coffee. Stepwise discriminant analysis with jackknife tests, using isotopic and elemental data, provided up to 77% correct classification of regions of production. Samples from ...
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    This study presents the stable isotopic and elemental compositions of single-origin, roasted coffees available to retail consumers. The δ(13)C, δ(15)N, and δ(18)O compositions were in agreement with those previously reported for green coffee beans. The δ(15)N composition was seen to be related to organic cultivation, reflected in both δ(2)H and δ(18)O compositions. The δ(13)C composition of extracted caffeine differed little from that of the bulk coffee. Stepwise discriminant analysis with jackknife tests, using isotopic and elemental data, provided up to 77% correct classification of regions of production. Samples from Africa and India were readily classified. The wide range in both isotopic and elemental compositions of samples from other regions, specifically Central/South America, resulted in poor discrimination between or within these regions. Simpler X-Y and geo-spatial plots of the isotopic data provided effective visual means to distinguish between coffees from different regions.
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    Journal Title
    Journal of Agricultural and Food Chemistry
    Volume
    63
    Issue
    24
    DOI
    https://doi.org/10.1021/acs.jafc.5b01526
    Subject
    Chemical sciences
    Agricultural, veterinary and food sciences
    Engineering
    Science & Technology
    Life Sciences & Biomedicine
    Physical Sciences
    Agriculture, Multidisciplinary
    Chemistry, Applied
    Publication URI
    http://hdl.handle.net/10072/412605
    Collection
    • Journal articles

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