Abstract
The chemical composition of the widely used herbal tea made from lemon balm (Melissa officinalis L. subsp. officinalis) was previously unknown. The qualitative and quantitative composition of the main aromatic and polyphenolic constituents of the infusion were examined and compared with those of the leaves before and after infusion. The dried lemon balm leaves originally contained 0.32% essential oil of which citral (neral + geranial) 0.13%, total polyphenol compounds 11.8% comprising total hydroxycinnamic compounds 11.3% (rosmarinic acid 4.1%) and total flavonoid compounds 0.5%. The tea contained 10 mg/l of essential oil (extraction yield 31%) with much more citral (74% of the essential oil). It also contained large amounts of polyphenol compounds (about 1.07 g/l) corresponding to a 93% extraction yield.
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