Microwave-Enzyme Extraction of Coffee Grounds Into Antioxidant Fiber
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Solution Overview
Problem
Existing methods fail to effectively extract valuable compounds from spent coffee grounds (SCG) due to their high fiber content, leading to trapped molecules, necessitating improved hydrolysis for functional ingredients like antioxidants and prebiotics.
Innovation Solution
A combined process of microwave-assisted extraction (MAE) followed by enzymatic-assisted extraction (EAE) is employed to enhance the solubilization of SCG, utilizing enzymes like endo-beta-glucanase and cellulase, with optional pretreatments like pulsed electric field (PEF) or high-pressure extraction (HPE) to increase the yield of soluble matter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If polar or intermediately polar solvents are used for extraction, then valuable compounds can be extracted from SCG, but most coffee valuable molecules have already been extracted during brewing and remaining molecules are trapped within the abundant fiber network requiring extensive hydrolysis
Solution Approach 1:
The patent applies preliminary action by using microwave-assisted extraction (MAE) before enzymatic-assisted extraction (EAE). The MAE step pre-treats the SCG material to partially solubilize compounds and prepare the fiber network, making subsequent enzymatic hydrolysis more effective. This sequential approach where MAE acts as a preliminary step reduces the complexity of the overall extraction process while maximizing valuable compound recovery.
Solution Approach 2:
The patent uses enzymes as intermediary agents in the EAE step. Specific enzymes (cellulases, hemicellulases, pectinases, proteases, lipases) act as mediators to break down the fiber network and release trapped valuable molecules. These enzymatic intermediaries enable efficient extraction without requiring extensive harsh hydrolysis, thus reducing process complexity while maintaining high yield of soluble matter.
2Quantity of substance
If extensive hydrolysis is performed to extract trapped molecules from fiber network, then more valuable compounds are released, but the process becomes more complex and time-consuming
Solution Approach 1:
The MAE step serves as a preliminary action that partially breaks down the fiber structure and solubilizes some compounds before EAE. This pre-treatment reduces the time required for subsequent enzymatic hydrolysis to release trapped molecules, thereby decreasing total extraction time while maintaining high yield of soluble matter containing antioxidants and prebiotics.
Solution Approach 2:
The patent employs parameter changes by optimizing MAE conditions (power, time, temperature) and EAE conditions (enzyme type, concentration, pH, temperature) to maximize extraction efficiency. By carefully controlling these parameters, the process achieves high yield of soluble matter in reduced time compared to conventional extensive hydrolysis methods.
3Quantity of substance
If single extraction method (MAE or EAE) is used, then process is simpler, but overall amount of valuable soluble matter is lower compared to combined approach
Solution Approach 1:
The patent merges two extraction methods - MAE and EAE - into a combined sequential process. MAE provides rapid initial solubilization of compounds, while EAE subsequently releases trapped molecules through enzymatic hydrolysis. This combination achieves higher overall yield of valuable soluble matter (antioxidants, prebiotics) than either method alone, while the integrated process design manages the complexity through systematic integration of the two steps.
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 combined process significantly enhances the amount of soluble matter, particularly antioxidants and prebiotics, suitable for human consumption, surpassing yields achieved by individual methods, with improved antioxidant properties and gut health benefits.
Implementation Method 1
microwave assisted extraction (MAE) of the raw spent coffee ground material
Implementation Method 2
enzymatic assisted extraction (EAE) carried out on the spent coffee ground material
Implementation Method 3
utilizing enzymes like endo-beta-glucanase and cellulase
Implementation Method 4
optional pretreatments like pulsed electric field (PEF)
Implementation Method 5
high-pressure extraction (HPE) to increase the yield of soluble matter
Data Source
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AI summary
A process for upcycling spent coffee grounds into an antioxidant dietary fiber comprising the steps of: a) microwave assisted extraction (MAE) of the spent coffee ground (SCG) material in water at a temperature up to 200 °C and for a time of at least 5 min, followed by b) enzymatic assisted extraction (EAE) of the spent coffee ground material extracted according to step a) in an aqueous solution comprising an enzyme having endo-beta-glucanase and/or an enzyme having cellulase activity and recovering the soluble matter. In a preferred embodiment, prior to the MAE extraction step, the SCG is subjected to a pretreatment selected from a pulsed electric field treatment or high-pressure extraction or both.