Acid-Treated Tea Leaves for Maximizing EGCG Content
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Solution Overview
Problem
Current tea brewing methods result in significant reduction of epigallocatechin gallate (EGCG) levels due to withering and oxidation processes, which diminish the beneficial properties of tea.
Innovation Solution
Minimizing withering time and using an acid treatment, such as ascorbic and citric acid, followed by rapid freezing and maceration to maximize EGCG content in tea, thereby reducing oxidation and preserving catechins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional withering and oxidation processes are used in tea brewing, then the tea develops characteristic flavor and color, but EGCG levels are significantly reduced
Solution Approach 1:
The patent applies parameter changes by adjusting pH levels through acid treatment (adding citric acid or ascorbic acid) to create optimal conditions for EGCG preservation. The acid treatment modifies the chemical environment to prevent oxidation while maintaining tea quality, directly resolving the contradiction between preserving EGCG and following traditional processing methods
Solution Approach 2:
The patent implements preliminary action by performing acid treatment on tea leaves before brewing. This pre-treatment establishes protective conditions that prevent EGCG degradation during subsequent brewing steps, allowing traditional processing to continue while preserving catechin levels
2Quantity of substance
If withering time is extended in traditional tea processing, then flavor development is enhanced, but EGCG degradation increases
Solution Approach 1:
The acid treatment is applied as a preliminary action before brewing, creating protective conditions that prevent EGCG degradation during the brewing process. This allows for shorter brewing times while maintaining high EGCG levels, as the protective environment is already established before water contact
3Quantity of substance
If oxidation is allowed to proceed in traditional brewing, then tea color and flavor are developed, but catechin stability is reduced
Solution Approach 1:
The patent applies preliminary anti-action by introducing acid treatment that creates an oxidative environment resistant to the harmful oxidation effects. The acid (citric acid or ascorbic acid) establishes protective conditions before brewing, preventing catechin oxidation while allowing traditional brewing to proceed
Solution Approach 2:
The patent converts the harmful oxidation process into a beneficial effect by using acid treatment to control and direct oxidation. The acid creates conditions where oxidation proceeds in a controlled manner that preserves rather than degrades catechins, transforming the harmful oxidative environment into a protective one
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 significantly increases EGCG levels in tea, with the lemon-treated sample demonstrating 79 times higher EGCG levels compared to traditionally processed tea, and maintaining high levels through multiple infusions.
Implementation Method 1
the enzymatic oxidation reaction in the leaves that causes darkening and release of tannins
Implementation Method 2
treating the leaf and bud material with an acid treatment, such as ascorbic and citric acid
Implementation Method 3
The treated tea leaf and bud material may be subjected to a carefully controlled freezing step in order to maintain shelf life and stability of the EGCG levels within the product
Implementation Method 4
allowing the C. sinensis plant material to steep in water in order to extract the flavor and chemical compounds from the tea
Implementation Method 5
extract the flavor and chemical compounds from the tea
Implementation Method 6
macerating the treated, infused material to produce a final tea product with higher EGCG content
Data Source
AI summary
This invention describes a new method to maximize the epigallocatechin gallate (EGCG) content of brewed tea made using leaves and buds from C. sinensis. Unlike conventional tea processing methods, the method of the invention aims to minimize the leaf withering step, the oxidation step and any heating steps, all of which are present in many conventional tea processing methods. The method of the invention treats minimally withered tea leaf and bud material with an acid treatment and then a maceration treatment, optionally freezing the acid-treated material for storage purposes. The brewed tea resulting from the acid-treated and macerated leaves has a significantly higher EGCG content than conventionally produced teas.