Selective Caffeine Removal in Green Tea Extraction
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Solution Overview
Problem
Existing methods for extracting non-polymer catechins from tea leaves often result in reduced caffeine content but also diminish the taste and flavor of green tea, posing a challenge to selectively remove caffeine without impairing the tea's quality.
Innovation Solution
A production method involving bringing tea leaves into contact with an aqueous solution with a Brix of 0.2% to 1.0% at temperatures between 80° C. to 100° C., followed by extraction with water at 50° C. to 100° C., to selectively remove caffeine while preserving the taste and flavor of green tea.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If non-polymer catechins are extracted from tea leaves using conventional methods, then caffeine content is reduced, but taste and flavor of green tea are diminished
Solution Approach 1:
The invention changes the temperature parameter to a specific range of 80-100°C and controls the aqueous solution concentration (Brix) to 0.2-1.0%, which selectively removes caffeine while preserving taste and flavor compounds. This parameter optimization allows differential extraction based on solubility characteristics at controlled temperatures.
Solution Approach 2:
The invention uses a controlled aqueous solution with specific Brix (0.2-1.0%) as an intermediary medium that facilitates selective caffeine removal while protecting taste and flavor compounds. The controlled concentration acts as a mediator to achieve selective extraction without over-extraction of beneficial compounds.
2Object-generated harmful factors
If hot water treatment is performed at high temperature and pressure to reduce caffeine, then caffeine content decreases, but tea leaf quality and fermentation control are affected
Solution Approach 1:
The invention optimizes temperature to 80-100°C (avoiding excessive heat that causes deterioration) and controls aqueous solution concentration to Brix 0.2-1.0%, which selectively removes caffeine while maintaining tea leaf quality and preventing unwanted fermentation changes.
Solution Approach 2:
The invention applies partial action by using a controlled, moderate aqueous solution concentration (Brix 0.2-1.0%) rather than excessive water or strong solutions, achieving sufficient caffeine removal while avoiding over-extraction and quality deterioration of tea leaves.
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
This method efficiently produces a composition with reduced caffeine content and rich taste and flavor, maintaining the quality of green tea by suppressing fermentation and enhancing catechin extraction.
Implementation Method 1
a step of bringing tea leaves into contact with an aqueous solution having a Brix of from 0.2% to 1.0% at from 80° C. to 100° C.
Implementation Method 2
bringing tea leaves into contact with an aqueous solution... to selectively remove caffeine while preserving the taste and flavor of green tea
Implementation Method 3
at from 80° C. to 100° C.
Data Source
AI summary
Provided is a production method for a composition containing non-polymer catechins, including the following step (A): (A) a step of bringing tea leaves into contact with an aqueous solution having a Brix of from 0.2% to 1.0% at from 80° C. to 100° C.