Why Fermented Green Tea Requires Lab Testing Before Marketing?

Green tea is a traditional drink derived from the tea plant (Camellia sinensis). It is known to have a more bitter taste compared to matcha, which is why some people prefer matcha. However, through fermentation with the help of microbes, the bitterness and astringency of green tea can be reduced.

Fermentation also produces new flavor notes, such as fruity, refreshing, and slightly sour tastes, making fermented green tea more appealing to consumers. In addition to offering flavor variations, fermented green tea also provides a wide range of health benefits. Several studies have reported that consuming fermented green tea may help with weight loss, reduce cholesterol levels, improve blood pressure, and decrease excessive lipoprotein levels in obese women.

• Green Tea Fermentation Process
• Bioactive Compounds in Fermented Green Tea
• Health Benefits of Fermented Green Tea

Green Tea Fermentation Process

Fermented green tea is produced through microbial activity that develops on the surface of the tea liquid. The microbes involved include lactic acid bacteria (LAB) (Lactobacillus and Enterococcus), yeasts (Candida, Pichia, Saccharomyces cerevisiae), and certain fungi considered safe for consumption, such as Aspergillus luchuensis. The fermentation mechanism of green tea is similar to that of kombucha, characterized by the formation of a thin (biofilm) layer that appears bubbly.

This layer enhances aeration, supporting the growth of aerobic microbes. During fermentation, microorganisms produce various enzymes (cellulase, amylase, catalase, proteinase, and mannanase) that break down complex compounds into simpler molecules. In addition, polyphenol oxidation produces compounds that contribute to the unique color and flavor of fermented tea. Microbes also produce caffeine, theobromine, and theophylline. These compounds help bacteria produce cellulose that forms new biofilm layers, which can be reused for subsequent fermentation batches.

Bioactive Compounds in Fermented Green Tea

Fermentation generates a wide range of beneficial compounds, such as vitamins (B1, B2, B6, B12, C, K), organic acids (acetic acid, gluconic acid, lactic acid, citric acid), natural antioxidants (polyphenols, flavonoids), enzymes and dietary fiber, along with byproducts like carbon dioxide and alcohol (less than 0.05%, so it is still considered a non-alcoholic beverage). Additionally, fermented green tea contains relatively low caffeine (about 25 mg), lower than regular green tea (40–50 mg). This makes it more suitable for people sensitive to caffeine.

Health Benefits of Fermented Green Tea

Many studies have confirmed the health benefits of fermented green tea, including:

• Heart health: increases HDL (good cholesterol), lowers LDL (bad cholesterol), and prevents cholesterol oxidation, thereby reducing the risk of coronary heart disease.
• Weight and metabolism control: has anti-obesogenic effects by reducing fat accumulation, and hypolipidemic effects by lowering blood triglyceride levels.
• Digestive health: contains natural probiotics that help balance gut microbiota.
• Immune support: enhances resistance against harmful bacterial infections without disrupting beneficial microbes.
• Liver protection: studies in rats show that fermented green tea helps reduce liver toxicity. Green tea extract has been proven to improve serum levels in patients with non-alcoholic fatty liver disease (NAFLD).

Fermented green tea is not only an alternative beverage with a more complex and refreshing taste, but it also holds great potential as a natural probiotic source and functional drink. With its rich bioactive content, fermented green tea supports heart, metabolic, digestive, and liver health. Unsurprisingly, fermented green tea—especially in the form of kombucha—is becoming increasingly popular in many countries as a modern health drink rooted in ancient traditions.

Before marketing your fermented green tea product, ensure that the entire process and formulation meet applicable safety and quality standards. From microbial contamination testing and stability testing to bioactive content verification and packaging safety testing—each stage of laboratory testing plays a crucial role in ensuring the product remains safe, stable, and consistent in the hands of consumers.

IML Research provides comprehensive laboratory testing services for fermented products, including tea-based beverages. Trust our team of experts to ensure accurate, complete, and reliable results. Contact IML Research now to ensure your product passes the test and is ready to compete in the market.

Author: Safira
Editor: Sabilla Reza

Reference:

Rana, P., Panda, P., Shukla, P., Sahore, A., Chauhan, A., & Karnwal, A. (2021). Production of fermented green tea and its nutrient analysis: A mini review. Journal of Postharvest Technology, 9(2), 101–113.