Kombucha has become one of the most popular fermented drinks recently. People around the world enjoy it for its fizzy texture and sour taste. Many also drink it because they believe it gives health benefits. But scientists are now studying kombucha. more closely to understand what happens during fermentation and how its ingredients affect the final drink.
A research team from Wrocław University of Environmental and Life Sciences and Wrocław Medical University examined one important question. Does the type of tea used to make kombucha change its properties? Their findings suggest that it does, and the differences are much bigger than expected.
The study was published in Food Chemistry. Researchers compared kombucha made from five tea varieties. These were black tea, green tea, white tea, oolong tea, and pu-erh tea. Even though all samples were fermented under the same conditions, the final drinks were entirely unique.
Kombucha is made by fermenting sweetened tea with SCOBY. SCOBY stands for symbiotic culture of bacteria and yeast. This mix of microorganisms is responsible for the fermentation process. During fermentation, many chemical reactions happen inside.
Yeast first break down the sugar. This creates alcohol and carbon dioxide. Thereafter, bacteria convert these substances into organic acids. Two important acids are acetic acid and gluconic acid. These acids contribute to kombucha’s sour flavour and slightly sharp tastes.
Fermentation also changes many natural compounds already present in tea. Tea contains substances such as polyphenols and catechins. This compound is often linked to antioxidant activities. As fermentation continues, their structures change. New compounds also appear.
Scientists noticed major changes in aromatic compounds. These are chemicals that affect smell and flavour. Some compounds found in freshly brewed tea were becoming weaker or disappeared completely. At the same time, new compounds were formed because of microbial activities.
Two compounds increased significantly during fermentation. These were linalool and 2-phenylethanol. Both are known for their floral and fruity aroma. They are also found in flowers and essential oils. Their increase helps make kombucha smell more complex and more pleasant.
To study these changes, researchers were using advanced lab methods. They apply chromatography and mass spectrometry. This tool allowed them to track hundreds of compounds inside each kombucha sample. This gives them a detailed view of how fermentation changes the drink.
One of the most surprising findings was how strong tea type influenced the final results. Even with identical fermentation conditions, each tea produces a very different chemical profile. This means the starting tea plays a major role in shaping kombucha.
The study also looked at biological activity. Researchers measured antioxidant potential. Antioxidants help neutralise free radicals. Free radicals are unstable molecules that can damage cells and contribute to ageing. Kombucha made from green tea and oolong tea performs best. These two showed the strongest antioxidant activities. They were also better at neutralising free radicals than the other tea-based kombucha drinks.
This suggests some kombucha types may offer greater biological benefits than others. However, scientists warn against making strong health claims too soon. Laboratory results do not automatically prove benefits in humans.
More human studies are still needed. Clinical research will help determine whether drinking specific kombucha Variety can improve health in measurable ways.
The findings also support broader research on fermented foods. Fermentation can improve nutrient availability. It can also create new bioactive compounds and influence gut bacteria. Because of these benefits, fermented foods are receiving growing scientific attention.
The researchers argue that one should not perceive kombucha as a singular universal beverage. Its flavor, aroma, and chemistry depend heavily on the tea used. Green tea kombucha had a fresh and grassy character. Oolong created stronger floral and fruity notes. Black tea and pu-erh produced deeper, earthier flavors with a heavier fermented aroma. In simple terms, not all kombucha are the same. The tea you choose can greatly change the drink.
