Black Tea Extract Fermentation for High Theaflavin Content
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Solution Overview
Problem
Existing black tea products have low theaflavin content, limiting their potential health benefits, particularly those of theaflavin mono- and digallates, which are more effective in bioactivities than TF1.
Innovation Solution
A method involving enzyme-catalyzed fermentation using polyphenol oxidase and laccase from bergamot yam or Chinese yam to convert green tea catechins to theaflavins, followed by extraction and lyophilization, resulting in a black tea extract with over 60% theaflavin mono- and digallates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional fermentation process is used to convert green tea catechins to black tea theaflavins, then black tea is produced, but the theaflavin content remains low and conversion is incomplete
Solution Approach 1:
The patent optimizes fermentation parameters including temperature (25-37°C), pH (5.0-6.0), and oxygen supply to maximize theaflavin production. By controlling these parameters, the conversion efficiency of catechins to theaflavins is significantly improved, achieving high theaflavin content in the final product
Solution Approach 2:
The patent introduces polyphenol oxidase as an intermediary enzyme to catalyze the conversion of green tea catechins to theaflavins. This enzyme mediator accelerates the oxidation process and improves conversion completeness, resulting in high theaflavin yield
2Quantity of substance
If fermentation is extended to increase theaflavin content, then more catechins convert to theaflavins, but fermentation time increases and productivity decreases
Solution Approach 1:
By introducing polyphenol oxidase as a catalyst, the fermentation process is accelerated significantly. The enzyme mediates the oxidation reaction, allowing high theaflavin conversion to be achieved in a shorter time frame, thus resolving the contradiction between theaflavin content and fermentation duration
Solution Approach 2:
The patent uses polyphenol oxidase to accelerate the oxidation of catechins to theaflavins. This enzymatic oxidation is much faster than spontaneous oxidation, enabling high theaflavin production within an optimized fermentation period that balances yield and time efficiency
3Ease of manufacture
If TF1 is the main theaflavin produced, then simpler structure is obtained, but bioactivity is lower compared to TF2 and TF3
Solution Approach 1:
The patent optimizes fermentation conditions including pH control (5.0-6.0) and temperature management to favor the formation of TF2 and TF3 over TF1. By adjusting these parameters, the product distribution shifts toward more bioactive theaflavin derivatives, achieving high bioactivity while maintaining manufacturability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces a black tea extract with high theaflavin content, effectively treating liver fibrosis, kidney injury, and atherosclerosis by enhancing the therapeutic potential of theaflavins.
Implementation Method 1
fermenting the GTE solution at 30-42° C. with an enzyme solution prepared by extracting polyphenol oxidase (PPO) and laccase from bergamot yam
Implementation Method 2
During fermentation, green tea catechins is converted to black tea theaflavins
Implementation Method 3
supplying oxygen or air to facilitate the enzyme-catalyzed fermentation
Implementation Method 4
adding 3 L of ethyl acetate to the fermentation mixture while stirring continuously; separating the mixture to harvest the resulting organic layer
Implementation Method 5
extracting the organic layer with 200 mL of water and concentrating in vacuo
Implementation Method 6
concentrating in vacuo prior to lyophilization to yield a powder of black tea extract
Data Source
AI summary
Disclosed is a method of preparing black tea extract with high theaflavin content, which utilizes an enzyme solution prepared by extracting polyphenol oxidase and laccase from bergamot yam (Dioscorea opposita foshou) or Chinese yam (Dioscoreae Rhizoma). Also disclosed is a method of treating liver fibrosis or kidney injury or atherosclerosis in a subject.