Abstract
The impact of microwave roasting cocoa beans on the aroma and phytochemical profile of dark chocolates (70% cocoa) was studied. Three chocolates produced from microwave roasted beans (450 W–55 min, 600 W–35 min, 900 W–20 min) were compared with a chocolate produced from convectively roasted beans (130 °C–30 min). Aroma analysis via HS-SPME-GC-MS indicated that microwave roasting of cocoa beans resulted in chocolate with a distinctive aroma profile, compared to the chocolate produced from convectively roasted beans. Increased power input seems the main inducer of elevated levels of aroma compounds. Interestingly, the impact of the four treatments on the phytochemical profile, measured via LC-HRMS, of the chocolates was rather comparable. Microwave roasting of cocoa beans was more prone to oxidation, but still within acceptable limits. The results validate that microwave roasting is a promising alternative technique that can be used effectively for chocolate production.
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