Journal
JOURNAL OF PINEAL RESEARCH
Volume 52, Issue 4, Pages 470-476Publisher
WILEY
DOI: 10.1111/j.1600-079X.2011.00964.x
Keywords
coffee beans; indoleamines; melatonin; serotonin
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Funding
- Department of Science & Technology, Government of India, New Delhi
- CSIR, New Delhi
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A high-performance liquid chromatography (HPLC) and an electrospray ionization mass spectrometry (LC/ESI-MS) methods were applied to quantify the profiles of melatonin and serotonin (5-HT) in green and roasted beans of Coffea canephora (robusta) and Coffea arabica (arabica). Both melatonin and 5-HT were detected in green coffee beans (5.8 +/- 0.8 mu g/g dry weight (DW), 10.5 +/- 0.6 mu g/g DW) and also in roasted beans of C. canephora (8.0 +/- 0.9 mu g/g DW, 7.3 +/- 0.5 mu g/g DW). Melatonin (3.0 +/- 0.6 mu g/50 mL) and 5-HT (4.0 +/- 0.7 mu g/50 mL) were detected in coffee brew. In C. arabica, 5-HT was high in green beans (12.5 +/- 0.8 mu g/g DW) compared with roasted beans (8.7 +/- 0.4). The levels of melatonin were higher (9.6 +/- 0.8 mu g/g DW) in roasted beans compared with green beans (6.8 +/- 0.4 mu g/g DW). Both melatonin (3.9 +/- 0.2 mu g/50 mL) and 5-HT (7.3 +/- 0.6 mu g/50 mL) were detected in coffee brew. Because of the relevance of indoleamines as bioactive molecules with implications for food, nutritional sciences and human health, it was of interest to explore their levels in coffee, an important universal beverage.
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