Spent Coffee Grounds Adsorption for Low-Acrylamide Coffee Extract
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Solution Overview
Problem
Existing methods for reducing acrylamide in coffee products, particularly during the extraction process for instant coffee, result in undesirable flavor changes and fail to effectively lower acrylamide levels beyond those formed during roasting, with acrylamide levels increasing unexpectedly during extraction and storage.
Innovation Solution
A method involving a heat treatment of acrylamide-containing aqueous coffee extract with spent coffee grounds at temperatures between 70 to 120°C for at least 30 minutes to trap acrylamide within the melanoidins in the spent grounds, reducing acrylamide levels by up to 95% without affecting flavor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If acrylamide is reduced during extraction process, then acrylamide levels decrease, but flavor quality deteriorates
Solution Approach 1:
The patent introduces an intermediary substance (activated carbon or ion-exchange resin) that selectively adsorbs acrylamide from the coffee extract without interacting with flavor compounds. This mediator enables the separation of the harmful substance from the desirable flavor components, resolving the contradiction between reducing acrylamide and maintaining flavor quality.
Solution Approach 2:
The patent changes the physical-chemical parameters of the extraction process, specifically controlling pH levels and temperature conditions during extraction and treatment. By optimizing these parameters, the process achieves selective removal of acrylamide while preserving the thermal-sensitive flavor compounds, thus resolving the contradiction between acrylamide reduction and flavor preservation.
2Object-affected harmful factors
If acrylamide levels are reduced in roast and ground coffee, then carcinogenic content decreases, but extraction efficiency increases leading to higher acrylamide in instant coffee
Solution Approach 1:
The patent applies preliminary treatment to the roast and ground coffee before extraction, using enzymes such as asparaginase to degrade asparagine (the precursor to acrylamide) before the extraction process. This preliminary action reduces the substrate available for acrylamide formation during high-temperature extraction, allowing efficient extraction to proceed without generating excessive acrylamide.
Solution Approach 2:
The patent introduces a separate extraction step specifically targeted at removing acrylamide from the coffee extract after the main extraction process. This additional extraction operation selectively removes the harmful substance without affecting the overall extraction efficiency or yield of the coffee product.
3Productivity
If high temperatures are used during extraction, then yield from beans increases, but acrylamide formation increases
Solution Approach 1:
The patent applies preliminary enzymatic treatment to reduce asparagine content before the high-temperature extraction process. This preliminary action prevents acrylamide formation during the high-yield extraction by removing the chemical precursor, allowing the process to operate at high temperatures without generating excessive acrylamide.
Solution Approach 2:
The patent introduces an intermediary treatment step (enzymatic degradation or adsorptive removal) that decouples the relationship between temperature and acrylamide formation. The intermediary substance or process selectively targets acrylamide or its precursor, allowing high-temperature extraction to proceed for maximum yield while preventing or removing acrylamide formation.
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 effectively reduces acrylamide levels in coffee extracts and soluble coffee products to below 100 ppb, maintaining flavor quality and providing a commercially viable solution for industrial production.
Implementation Method 1
contacting an acrylamide-containing aqueous coffee extract with spent coffee grounds at a temperature of 70 to 120° C. for at least 30 minutes to form an acrylamide-depleted coffee extract
Data Source
AI summary
The present invention provides a method of reducing acrylamide in an aqueous coffee extract, the method comprising: contacting an acrylamide-containing aqueous coffee extract with spent coffee grounds at a temperature of 70 to 120° C. for at least 30 minutes to form an acrylamide-depleted coffee extract.