Sunflower Protein Concentrate Processing Without Hexane
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Solution Overview
Problem
Existing methods for producing sunflower protein concentrates face challenges in removing polyphenols, particularly chlorogenic acid, which cause an undesirable greenish color and denature proteins, while also requiring the use of hexane, leading to increased costs and environmental impact.
Innovation Solution
A process involving partial dehulling and cold-pressing of sunflower seeds, followed by washing with acidic aqueous and alcohol solvents, specifically ethanol, to produce a hexane-free protein concentrate with reduced polyphenols and improved digestibility, emulsifying capacity, and color stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hexane extraction is used to produce sunflower protein concentrate, then protein recovery efficiency is improved, but environmental impact and production cost increase
Solution Approach 1:
The patent changes the extraction parameter from hexane (petrochemical solvent) to aqueous ethanol (bio-based solvent), maintaining extraction effectiveness while eliminating environmental harm. This parameter substitution resolves the contradiction by preserving productivity through efficient solvent-protein interaction while removing the harmful hexane component.
Solution Approach 2:
The patent employs aqueous ethanol, a renewable and biodegradable solvent, replacing hexane which requires complex recovery and disposal systems. The aqueous ethanol system is inherently more environmentally friendly and can be disposed of or recycled more easily, reducing both environmental impact and production costs associated with solvent management.
2Quantity of substance
If conventional extraction methods are used, then protein concentrate is obtained, but polyphenols cause greenish color and protein denaturation
Solution Approach 1:
The patent selectively extracts polyphenols (particularly chlorogenic acid) from the protein concentrate using aqueous ethanol treatment. This targeted removal eliminates the greenish color and prevents protein denaturation while preserving the protein concentrate yield, directly resolving the contradiction between quantity and purity.
Solution Approach 2:
The patent uses aqueous ethanol as an intermediary substance that facilitates the separation of polyphenols from proteins. The ethanol-water mixture acts as a mediator that preferentially binds to polyphenols, allowing their removal while leaving the protein structure intact and preventing denaturation.
3Stability of the object's composition
If aqueous ethanol is used for polyphenol removal, then color stability is improved, but processing complexity increases
Solution Approach 1:
The patent combines polyphenol removal and protein concentration steps into a single aqueous ethanol extraction process. This merging of operations achieves color stability improvement while avoiding the need for separate, complex processing stages, thereby reducing overall processing complexity.
Solution Approach 2:
The aqueous ethanol solution serves multiple functions simultaneously: it acts as an extraction solvent for polyphenol removal, a purification agent for protein concentration, and a color-stabilizing medium. This multi-functionality reduces the number of separate processing steps needed, simplifying the overall process while achieving color stability.
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 process achieves a high-quality sunflower protein concentrate with a neutral color, enhanced nutritional properties, and reduced environmental footprint by avoiding hexane, while maintaining protein integrity and functionality.
Implementation Method 1
washing said press cake by mixing it with a first acidic aqueous solution to obtain an aqueous-washed oilseed meal
Implementation Method 2
washing said aqueous-washed oilseed meal by mixing it with an alcohol solvent, to obtain an alcohol-washed oilseed meal
Implementation Method 3
separating said alcohol-washed oilseed meal from said solvent to obtain said protein concentrate
Data Source
AI summary
A process for producing a protein concentrate from sunflower seed and a sunflower seed concentrate. The process comprises the successive steps of:a) providing a press cake from oilseed, said oilseed being at least partially dehulled before being pressed, wherein said press cake is not extracted with hexaneb) washing said press cake by mixing it with a first acidic aqueous solution to obtain an aqueous-washed oilseed meal;c) washing said aqueous-washed oilseed meal by mixing it with a first alcohol solvent, to obtain a first alcohol-washed oilseed meal, wherein said first alcohol solvent is a hydrous or a non-hydrous alcohol and has an alcohol concentration which is above 75% w/w; andd) separating said alcohol-washed oilseed meal from said solvent to obtain said protein concentrate. The concentrate has a protein content of at least 55% dry matter w/w, preferably at least 65% dry matter w/w, and less than 80% dry matter w/w (N×6.25); and a content of polyphenol compounds of less than 2% dry matter w/w, preferably equal or less than 1% dry matter w/w.