Pea Protein Isolate Processing for Off-Flavor Reduction
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Solution Overview
Problem
Current plant protein isolates, particularly leguminous and pea protein isolates, often exhibit off-flavors such as 'beany' or 'plant-like' tastes, which are not effectively masked by existing solutions, and these flavors can alienate consumers seeking 'clean label' products.
Innovation Solution
A method involving thermocoagulation and specific processing conditions, including milling in the absence of oxygen, high-temperature acid washing, and controlled pH, to produce pea protein isolates with reduced volatile compounds and improved solubility, resulting in a flavorless and neutral-tasting product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional plant protein extraction methods are used, then protein production is achieved, but off-flavors such as 'beany' or 'plant-like' tastes are generated
Solution Approach 1:
The patent applies inert atmosphere by conducting milling and extraction processes in the absence of oxygen. This prevents oxidative reactions that generate volatile off-flavor compounds while maintaining protein extraction efficiency. The inert environment eliminates oxygen from the system throughout the processing steps.
Solution Approach 2:
The patent employs parameter changes by adjusting pH to specific ranges (3.0-5.0 for acid washing, 7.0-9.0 for alkali washing) and controlling temperature (60-100°C for washing steps). These parameter modifications optimize the removal of volatile compounds while preserving protein functionality and extraction yield.
2Object-generated harmful factors
If chemical compounds are introduced to mask off-flavors, then flavor masking is achieved, but product complexity and cost increase
Solution Approach 1:
The patent converts the harmful volatile compounds into removable substances through systematic washing processes. By transforming the extraction approach to use controlled pH and temperature washing, the off-flavor compounds are eliminated through physical-chemical separation rather than requiring additional masking agents.
Solution Approach 2:
The patent applies extraction principles by removing volatile off-flavor compounds through sequential acid and alkali washing steps. The harmful volatiles are extracted from the protein matrix and separated into wash streams, leaving clean protein isolate without requiring added masking compounds.
3Object-generated harmful factors
If extensive washing is performed to reduce volatiles, then off-flavor reduction is achieved, but processing time and water consumption increase
Solution Approach 1:
The patent applies periodic action through sequential alternating acid and alkali washing steps. This periodic treatment with different pH solutions enhances the removal efficiency of volatile compounds, achieving thorough purification in a systematic sequence rather than requiring continuous prolonged washing.
Solution Approach 2:
The patent maintains continuity of useful action by implementing continuous counter-current washing operations. The protein slurry continuously passes through multiple washing stages with fresh wash solutions, ensuring constant removal of volatile compounds throughout the process without interruption or batch delays.
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 achieves a significant reduction in off-flavor compounds, ensuring a neutral taste and enhanced solubility, surpassing the quality of commercial protein isolates and meeting consumer demands for 'clean label' products.
Implementation Method 1
A method involving thermocoagulation and specific processing conditions
Implementation Method 2
high-temperature acid washing, and controlled pH
Data Source
AI summary
The invention relates to a plant protein isolate containing less than 10 microgram, preferably less than 5 microgram, of the sum of hexanal, 2-pentyl-furan, (E)-2,4,heptadienal and 1-octen-3-ol per gram of dry matter and its method of preparation. The plant protein is preferably obtained from leguminous plant, more preferably from pea or fava bean, most preferably from pea. The method for extracting the plant protein isolate consists of the steps: (a) providing a protein containing seed, (b) milling said seed, (c) suspending the milled seed in water, (d) extracting proteins from said milled suspension and (e) washing the extracted proteins with water at a temperature between 60° C. and 100° C. and at a pH in the range of 4 to 5.5.