Aqueous extraction of black leaf tea

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Abstract
Summary: Total solids contents are reported for tea extracts prepared at 80°C from mixtures of (1) black tea and water, (2) black tea and tea extracts (up to 11 mass percent of total solids) and (3) residues from a first extraction and water, shaken for 4hr in sealed bottles and centrifuged at 1000g for 30 min, and the fraction of leaf dissolving inferred by materials balances. At the highest mixing ratio of solid to extracting medium employed (1:10), leaf solubility is essentially independent of extract concentration. Solubility in water alone lies between two limits: 35% at the highest mixing ratio and 47% at infinite dilution (dry leaf basis), indicating the presence of highly soluble and sparingly soluble fractions. Interpretation of the results in terms of three components; solubles, insolubles and water is discussed and a simple adjunct to a triangular composition diagram proposed to allow for the variable amounts of sparingly soluble matter remaining undissolved.

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