The laboratory experiments are carried out with black tea from Kenya. As extracting solvent pure ethanol as well as a mixture consisting of ethanol/water 90/10 (m/m) are used. The total content of polyphenols is quantified by five stage maceration (each 24 h), followed by 96 h control percolation with 0.1 BV/h to ensure total extraction. This procedure is state-of-the-art [11]. For the total amount of polyphenols and hence a yield of Yi = 100% a loading of cpolyphenols = 211.4 g/kgDry substance tea is determined. The dry substance of the extract is defined as a further side component.