Spent Coffee Grounds Upcycling Through Microwave-Enzyme Extraction

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Solution Overview

Problem

Existing methods for upcycling spent coffee grounds (SCG) are inefficient in extracting valuable soluble matter and antioxidant compounds, particularly due to the high lignin and fiber content, which traps these compounds within the fiber network, necessitating improved hydrolysis techniques.

Innovation Solution

A combined process of microwave assisted extraction (MAE) followed by enzymatic assisted extraction (EAE) is employed to enhance the extraction of soluble matter from SCG, with specific enzyme activities and conditions optimized to increase the yield of antioxidant dietary fiber.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If extensive hydrolysis is used to extract compounds from SCG, then extraction efficiency improves, but process complexity and time increase

Engineering Contradiction:

Improveextraction efficiencyVSAvoidprocess complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent combines microwave irradiation and enzymatic hydrolysis into a single integrated process. The microwave field and enzyme catalyst work synergistically to break down the fiber network and release trapped compounds, achieving extensive hydrolysis effects while simplifying the overall process compared to sequential traditional methods.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent utilizes microwave irradiation to fundamentally change the physical and chemical parameters of the SCG matrix, creating conditions that enhance enzyme activity and facilitate rapid hydrolysis. The microwave energy alters the structural parameters of lignin and cellulose, making them more accessible to enzymatic action.

Inventive Principle:

Principle #35Parameter changes

2Speed

If microwave treatment alone is used, then extraction speed improves, but extraction completeness is insufficient due to trapped compounds

Engineering Contradiction:

Improveextraction speedVSAvoidextraction completeness

Core Design Contradiction:

SpeedVSQuantity of substance

Solution Approach 1:

The patent introduces enzymes as intermediary catalysts that mediate between the microwave energy and the SCG matrix. The enzymes act as intermediaries that specifically target and break down the fiber network structures, releasing trapped compounds that microwave treatment alone cannot access, thereby completing the extraction process.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite action between microwave radiation and enzymatic catalysts. This composite approach combines the rapid heating and structural disruption capabilities of microwaves with the specific biochemical degradation capabilities of enzymes, achieving both speed and completeness in extraction.

Inventive Principle:

Principle #40Composite materials

3Productivity

If enzyme treatment alone is used, then hydrolysis effectiveness improves, but extraction time increases

Engineering Contradiction:

Improvehydrolysis effectivenessVSAvoidextraction time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent applies microwave irradiation as a preliminary action before or during enzymatic treatment. The microwave energy pre-processes the SCG matrix by disrupting the fiber network and increasing accessibility, creating favorable conditions for enzyme action. This preliminary action reduces the time required for enzymatic hydrolysis to achieve effective results.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent employs periodic alternation between microwave irradiation and enzymatic treatment phases. The microwave pulses provide periodic energy input that maintains optimal conditions for enzyme activity while preventing overheating, thereby achieving effective hydrolysis in reduced time compared to continuous enzyme treatment alone.

Inventive Principle:

Principle #19Periodic action

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 and antioxidant properties, surpassing the yields achieved by either method alone, producing a prebiotic functional ingredient with improved gut health benefits.

Implementation Method 1

microwave assisted extraction (MAE)

Methodology Applied

Scientific EffectMicrowave heating: Dielectric Heating

Implementation Method 2

Enzyme-assisted extraction (EAE) is very promising for achieving an efficient and cost-effective hydrolysis of plant matrices

Methodology Applied

Scientific EffectEnzymatic hydrolysis: Enzyme

Implementation Method 3

different enzymes including β-glucanases, cellulases, and hemicellulases can be used to solubilize SCG insoluble components

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Data Source

PatentUS20250255922A1Process for upcycling spent coffee grounds into an antioxidant dietary fiber

Publication Date: 2025.08.14 SOREMARTEC SA(BE)

AI summary

A process for upcycling spent coffee grounds into an antioxidant dietary fiber involves a microwave assisted extraction of the spent coffee grounds in water at a temperature up to 200° C. for a time of at least 5 min, followed by an enzymatic assisted extraction of the spent coffee grounds in an aqueous solution including an enzyme having endo-beta-glucanase activity and/or an enzyme having cellulase activity. The process further involves recovering soluble matter. Prior to the microwave assisted extraction step, the spent coffee grounds are subjected to a pulsed electric field treatment or a high-pressure extraction or both.