Dataset Information

16-O-methylcafestol is present in ground roast Arabica coffees: Implications for authenticity testing.

ABSTRACT: High-field and low-field proton NMR spectroscopy were used to analyse lipophilic extracts from ground roast coffees. Using a sample preparation method that produced concentrated extracts, a small marker peak at 3.16?ppm was observed in 30 Arabica coffees of assured origin. This signal has previously been believed absent from Arabicas, and has been used as a marker for detecting adulteration with robusta. Via 2D 600?MHz NMR and LC-MS, 16-O-methylcafestol and 16-O-methylkahweol were detected for the first time in Arabica roast coffee and shown to be responsible for the marker peak. Using low-field NMR, robusta in Arabica could be detected at levels of the order of 1-2%?w/w. A surveillance study of retail purchased "100% Arabica" coffees found that 6 out of 60 samples displayed the 3.16?ppm marker signal to a degree commensurate with adulteration at levels of 3-30%?w/w.

SUBMITTER: Gunning Y

PROVIDER: S-EPMC5774150 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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Publications

16-O-methylcafestol is present in ground roast Arabica coffees: Implications for authenticity testing.

Gunning Yvonne Y Defernez Marianne M Watson Andrew D AD Beadman Niles N Colquhoun Ian J IJ Le Gall Gwénaëlle G Philo Mark M Garwood Hollie H Williamson David D Davis Aaron P AP Kemsley E Kate EK

Food chemistry 20171211

High-field and low-field proton NMR spectroscopy were used to analyse lipophilic extracts from ground roast coffees. Using a sample preparation method that produced concentrated extracts, a small marker peak at 3.16 ppm was observed in 30 Arabica coffees of assured origin. This signal has previously been believed absent from Arabicas, and has been used as a marker for detecting adulteration with robusta. Via 2D 600 MHz NMR and LC-MS, 16-O-methylcafestol and 16-O-methylkahweol were detected for t ...[more]

PMID: 29329870

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Dataset Information

16-O-methylcafestol is present in ground roast Arabica coffees: Implications for authenticity testing.

Publications

16-O-methylcafestol is present in ground roast Arabica coffees: Implications for authenticity testing.

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