Legume Protein Fractionation via pH and Temperature Control
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Solution Overview
Problem
Current methods for isolating legume proteins from field beans and peas result in poorly soluble, difficult-to-digest products with strong flavors and contamination by antinutritive substances, leading to low functionality and allergenic potential, which limits their suitability in food and technical applications.
Innovation Solution
A method involving targeted fractionation of legume proteins through pH and temperature adjustments, followed by mechanical separation and fractional precipitation, to produce high-quality protein fractions with improved solubility, nutritional value, and reduced allergenicity, without the need for expensive chemicals or complex processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional heat coagulation or acidic precipitation is used to isolate legume proteins, then protein isolation is achieved, but the proteins become poorly soluble, difficult to digest, and contaminated with antinutritive substances
Solution Approach 1:
The patent divides the protein isolation process into multiple sequential fractionation steps, separating proteins by molecular weight ranges (e.g., 10-30 kDa, 30-70 kDa, 70-150 kDa). Each fractionation step uses controlled pH adjustment and thermal treatment to selectively precipitate specific protein fractions, progressively purifying the target proteins while removing antinutritive substances and improving solubility and digestibility
Solution Approach 2:
The patent systematically changes physical and chemical parameters during fractionation, including adjusting pH values (e.g., pH 3.0-5.0 for first fractionation, pH 4.0-6.0 for second), controlling temperature (e.g., 60-80°C for thermal treatment), and modifying ionic strength. These parameter changes enable selective precipitation of different protein fractions with improved functional properties while minimizing contamination with harmful substances
2Productivity
If conventional protein isolation methods are used, then protein extraction is achieved, but strong flavors and allergenic potential remain
Solution Approach 1:
The patent selectively extracts and removes specific protein fractions that are responsible for strong flavors and allergenicity. By using fractional precipitation at controlled pH and temperature conditions, the method separates and removes high molecular weight proteins and other fractions containing allergens and strong-flavor compounds, while retaining the desired functional proteins with milder flavors and reduced allergenic potential
Solution Approach 2:
The patent applies preliminary thermal treatment and pH adjustment before final protein precipitation. These preliminary actions denature and aggregate unwanted proteins containing allergens and strong flavors, making them easier to separate in subsequent fractionation steps. The preliminary treatment also improves the functional properties of the target proteins by reducing their interaction with harmful substances
3Device complexity
If simple precipitation methods are used, then the process remains simple, but protein functionality and nutritional value are low
Solution Approach 1:
The patent employs a dynamic, multi-stage fractionation process where pH, temperature, and ionic strength are adjusted at each step to optimize separation of different protein fractions. The process progresses from crude extraction through sequential fractionation steps, with each stage dynamically adjusting parameters to target specific molecular weight ranges. This dynamic approach maintains operational simplicity while significantly improving protein functionality and nutritional value compared to static single-step precipitation
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 yields legume protein fractions with enhanced solubility, neutral taste, and improved digestibility, suitable for food, cosmetics, and technical applications, while minimizing antinutritive substances and allergenic potential, thus overcoming the limitations of existing protein isolation techniques.
Implementation Method 1
targeted fractionation of legume proteins through pH and temperature adjustments, followed by mechanical separation and fractional precipitation
Implementation Method 2
Heat coagulation of the proteins in the amniotic fluid with inactivation of the enzymes
Implementation Method 3
mechanical separation and fractional precipitation, to produce high-quality protein fractions
Data Source
AI summary
The invention relates to a process for producing coagulated leguminous protein fractions of MW > 14, comprising: initial charging of fruit juice; coagulation of the leguminous protein; removal of a leguminous protein fraction whose majority has an MW of from > 14 kD to approx. 600 kD; optionally washing the coagulated leguminous protein fraction thus obtained; and optionally drying the leguminous protein fraction, and to the use of the leguminous protein fraction as a food, food additive, medicament additive, animal feed, in cosmetics, as industrial protein, as an adhesive.