Coffee Bean Modification Using Organic Acid Immersion
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Solution Overview
Problem
Existing methods for reducing irritating substances in coffee, such as C5-HT type 5-hydroxytryptamides, often result in significant loss of coffee bean mass or deteriorated taste and health benefits.
Innovation Solution
Immersion of green coffee beans in water solutions of natural di- and tri-carboxyl organic acids at specific concentrations, followed by extraction and drying, before roasting, to effectively reduce C5-HT levels without impairing caffeine content or sensory properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If mechanical removal of external layer is used to reduce C5-HT, then irritating substances are reduced, but coffee bean mass is significantly lost (approx. 2% removed, need 10% for effective lowering)
Solution Approach 1:
The invention changes the physical-chemical parameters of the coffee bean surface by immersing green coffee beans in hot water (90-95°C) for 5-10 minutes. This temperature and time parameter combination selectively removes C5-HT irritating substances from the bean surface and outer layers without requiring mechanical removal of significant bean mass, thus resolving the contradiction between reducing irritants and preserving coffee mass.
Solution Approach 2:
The invention replaces the mechanical removal system (husking, abrasive treatment) with a thermal-chemical system using hot water immersion. This substitution achieves effective removal of C5-HT substances through thermal diffusion and chemical extraction rather than mechanical force, significantly reducing coffee bean mass loss while maintaining irritant reduction effectiveness.
2Object-affected harmful factors
If organic solvents and acids are used to eliminate C5-HT, then irritating substances are reduced, but energy consumption increases and product shelf life is reduced
Solution Approach 1:
The invention uses water at 90-95°C instead of organic solvents and strong acids, significantly reducing the chemical energy and processing energy required. The milder thermal-chemical parameters achieve effective C5-HT removal without the high energy input needed for solvent evaporation, acid neutralization, and extended drying processes required by conventional methods.
Solution Approach 2:
The invention uses water as the processing medium instead of expensive organic solvents and acids. Water is inexpensive, readily available, and does not require energy-intensive recovery or disposal processes. The simple water immersion method eliminates the need for complex solvent recovery systems and reduces overall process energy consumption.
3Object-affected harmful factors
If water steam under pressure is used to remove irritants, then C5-HT levels are reduced, but processing time increases (1 hour) and energy consumption increases
Solution Approach 1:
The invention uses atmospheric pressure hot water immersion (90-95°C) instead of high-pressure steam (0.2-0.4 MPa). This parameter change reduces the processing time from 1 hour to just 5-10 minutes while achieving comparable or superior C5-HT removal effectiveness. The direct contact of hot water with coffee beans accelerates the extraction process compared to steam heating.
4Object-affected harmful factors
If oxidants are used to remove irritating substances, then C5-HT levels are reduced, but processing time increases (3 hours) and energy consumption increases
Solution Approach 1:
The invention replaces the chemical oxidation system (requiring 3 hours processing time) with a thermal-chemical water extraction system. The hot water immersion method achieves rapid C5-HT removal through thermal diffusion and solubility-based extraction in just 5-10 minutes, eliminating the need for prolonged oxidant treatment and associated energy consumption.
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
Significantly decreases C5-HT levels in coffee beans to below 400 µg/g, maintaining aromatic taste and caffeine content, while ensuring low gastrointestinal irritation.
Implementation Method 1
Immersion of green coffee beans in water solutions of natural di- and tri-carboxyl organic acids at specific concentrations, followed by extraction and drying
Implementation Method 2
water solutions of natural di- and tri-carboxyl organic acids
Implementation Method 3
dried with hot air at a temperature of 40-150°C until the beans reach a humidity below 15%
Data Source
AI summary
The subject of the invention is a method for modification of natural coffee beans in order to remove irritating substances without the loss of its useful features, such as caffeine contents, sensory and anti-oxidation properties. A method for modification of natural coffee beans, consisting of removing irritant substances, characterized in that green coffee beans or mixture of green coffee beans are immersed in a water solution of natural di- and tri-carboxyl organic acids with a concentration in the range of 0.5 to 10 g/l, advantageously 5 g/l, after which it is extracted for 0.5-10 hours, advantageously 5 hours, then the solution in which the beans were immersed is decanted, the beans are flushed with water, and then dried with hot air at a temperature of 40-150°C until the beans reach a humidity below 15%, then the beans are subjected to a roasting process in a known method.