What is tea?
There are few plants that are so thoroughly investigated as a tea. The chemical composition of tea leaves is very complex.
The main ingredients of tea are purine alkaloids, caffeine and most tannins and simpler phenolics type catechin and derivatives thereof.
Tea has caffeine (caffeine trimethylxanthine), little theobromine, theophylline, adenine and xanthine, tannin, routine, essential oils and legumina.
The green tea has a Vitamin C, B1, B2, nicotinic acid and pantothenic acid. The tea has the dextrin, waxes, fats and other ballast substances. The best types of tea have the most tannin. Fermentation occurs aromatic, resinous essential oil from whom the smell of tea. This oil has many of methyl and phenyl ethyl alcohol, citronellol and geraniol very little.
The young leaves and buds contain more caffeine (and tannins) than older, but the value of tea is not appreciated only by the amount of caffeine, but primarily by the taste and smell, although the medicinal value of tea is based primarily on caffeine.
Yet most of the tea are consumed for pleasure and very little of the drug.