Pumpkin Seed Protein Nanoparticles via Anti-Solvent Precipitation
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Solution Overview
Problem
Current methods for preparing protein nanoparticles from pumpkin seed glutenin are inefficient, often using toxic crosslinking agents or causing protein denaturation, limiting their application in stabilizing high internal phase emulsions, which are essential for cosmetic and food-grade emulsions.
Innovation Solution
A method involving dissolving pumpkin seed protein powders in water, adjusting pH to 8-11, adding the solution to an ethanol solution with stirring, centrifugation, and freeze-drying to produce pumpkin seed protein nanoparticles, which can stabilize high internal phase emulsions independently without additional compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If enzyme crosslinking method with glutaraldehyde is used to prepare protein nanoparticles, then the nanoparticles can be formed, but residual crosslinking agent has adverse effects on organisms
Solution Approach 1:
The patent removes the harmful crosslinking agent step entirely from the preparation process. Instead of using enzyme crosslinking with glutaraldehyde, the invention employs a simple solvent precipitation method where ethanol is added to the protein solution to directly form nanoparticles, eliminating the source of toxic residuals completely
Solution Approach 2:
The patent uses food-grade ethanol as a temporary precipitating agent that is easily removed during centrifugation and washing steps. The ethanol serves its purpose of inducing nanoparticle formation and is then discarded, leaving no harmful residues in the final product
2Reliability
If thermal induction method is used to prepare protein nanoparticles, then nanoparticles can be formed, but unexpected protein denaturation occurs
Solution Approach 1:
The patent changes the preparation parameter from temperature-based induction to solvent-based induction. By using ethanol precipitation at controlled temperatures (4°C or room temperature) instead of thermal induction, the protein maintains its native structure while still forming nanoparticles through solvent-induced conformational changes
3Reliability
If acid induction method is used to prepare protein nanoparticles, then nanoparticles can be formed, but unexpected protein denaturation occurs
Solution Approach 1:
The patent changes the induction mechanism from pH-based acid induction to solvent-based precipitation. By using ethanol as the precipitating agent instead of acid, nanoparticles form through solvent-protein interactions without causing the extreme pH shifts that lead to protein denaturation and loss of structural integrity
4Ease of manufacture
If conventional methods are used to prepare pumpkin seed protein nanoparticles, then preparation can be achieved, but additional compounds are required which complicates the formulation
Solution Approach 1:
The patent extracts and eliminates the need for additional stabilizing compounds from the formulation. The pumpkin seed protein itself, when processed through ethanol precipitation, forms stable nanoparticles that can stabilize high internal phase emulsions independently, removing the complexity of multi-component formulations
Solution Approach 2:
The pumpkin seed protein nanoparticles serve their own stabilization function without requiring additional compounds. The nanoparticles formed through ethanol precipitation inherently possess the surface properties needed to stabilize emulsion interfaces, making the system self-sufficient and simplifying the overall formulation
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 resulting nanoparticles provide high storage and thermal stability to emulsions, preventing oxidation and demulsification, even after 60 days, and exhibit excellent rheological properties, making them suitable for cosmetic applications.
Implementation Method 1
adding the pumpkin seed protein solution through a peristaltic pump into an ethanol solution with stirring for 4 hours
Implementation Method 2
performing a centrifugation and collecting precipitates
Implementation Method 3
diluting the precipitates with water and performing a freeze-drying to obtain the pumpkin seed protein nanoparticles
Data Source
AI summary
The present invention provides a method for preparing an high internal phase of pumpkin seed protein nanoparticles, including dissolving pumpkin seed protein powder in water and adjusting pH to approximately 8 to 11 to obtain a pumpkin seed protein solution; adding the pumpkin seed protein solution through a peristaltic pump into an ethanol solution with stirring for 4 hours to obtain a first solution; performing a centrifugation to the first solution and collecting precipitates; diluting the precipitates with water and performing a freeze-drying to obtain the pumpkin seed protein nanoparticles. The present invention first uses an anti-solvent method to prepare pumpkin seed protein nanoparticles, which have excellent emulsifying properties and can stabilize the high internal phase emulsion. In addition, the resulting pumpkin seed protein nanoparticles can stabilize the high internal phase emulsion independently without compounding with other substances.