Waste from black tea production holds significant potential as a source of biologically active compounds with anticancer properties. This is the conclusion reached by Turkish researchers from the Middle East Technical University. The findings of the study were published in the journal Frontiers in Nutrition (FN).
Scientists examined the fibers left over after black tea processing. From these, they prepared a soluble beverage using two methods: hot extraction and cold extraction. These physicochemical techniques allow for the recovery of valuable components (such as essential oils, pigments, and bioactive substances) from plant or animal raw materials through the use of a solvent.
The analysis shows that the hot method enables the attainment of higher concentrations of catechins, theaflavins, thearubigins, and theanine. These compounds are recognized as beneficial for the body, exhibiting various positive biological effects.
Experts tested both extracts on cell cultures of prostate cancer, glioblastoma, and breast tumors. The hot method proved to be the most effective against prostate cancer cells and one line of glioblastoma cells, whereas the cold extract was better at suppressing the viability of breast cancer cells.
The authors cautiously summarize the results of the experiments. These were conducted exclusively on cell cultures, so it is too early to draw definitive conclusions. However, scientists already see great potential in black tea production waste as a foundation for creating beverages rich in bioactive compounds.
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