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Modulation of coffee aroma via the fermentation of green coffee beans with Rhizopus oligosporus: II. Effects of different roast levels.

Food Chemistry 2016 November 16
This study aims to evaluate how changes of the volatile and non-volatile profiles of green coffees induced by Rhizopus oligosporus fermentation of green coffee beans (Part I) translated to changes in the volatile and aroma profiles of light, medium and dark roasted coffees and non-volatile profile of roasted coffee where fermentation effects were most distinctive (light roast). R. oligosporus fermentation resulted in 1.7-, 1.5- and 1.3-fold increases in pyrazine, 2-methylpyrazine and 2-ethylpyrazine levels in coffees of all roast degrees, respectively. This corresponded with the greater extent of amino acids degradation in light roasted fermented coffee. Ethyl palmitate was detected exclusively in medium and dark roasted fermented coffees. The sweet attribute of light and dark roasted coffees were increased following fermentation along with other aroma profile changes that were roast degree specific. This work aims to develop a direct but novel methodology for coffee aroma modulation through green coffee beans fermentation.

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