Microparticles via Spray Drying Crosslinked Protein Matrix
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing food-grade microparticles using spray drying face challenges such as low active agent yield, instability of the matrix, and difficulties in using conventional spray dryers due to the need for specialized equipment and pre-heating steps, which are not feasible for all food products, especially commodity items.
Innovation Solution
A method involving a liquid feedstock solution with protein, acid, and a volatile divalent metal salt that activates at elevated temperatures to crosslink and aggregate proteins, allowing for the production of stable microparticles with high active agent yield using conventional spray drying equipment, without the need for volatile bases or specialized nozzles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional spray drying equipment is used to produce microparticles, then equipment cost and complexity are reduced, but active agent yield and microparticle stability deteriorate (only 11-13% yield)
Solution Approach 1:
The patent changes the chemical parameters of the feedstock by incorporating specific proteins (whey protein isolate, casein, or soy protein isolate) at controlled concentrations (1-10% w/v). These proteins undergo temperature-dependent conformational changes and crosslinking during spray drying, transforming the feedstock properties to enable effective microparticle formation and active agent entrapment using conventional equipment, thereby achieving 70-80% active agent yield without specialized nozzles or pre-heating systems.
Solution Approach 2:
The patent creates composite microparticles consisting of protein matrices combined with active agents (probiotics, prebiotics, or other bioactives). The protein component (whey protein isolate, casein, or soy protein isolate) forms a protective crosslinked network that stabilizes and entraps the active agent, achieving high retention (70-80%) while using simple conventional spray drying equipment without requiring complex specialized machinery.
2Reliability
If specialized vibrating nozzle machinery is used to produce microparticles, then microparticle formation and stability are improved, but equipment cost and complexity increase
Solution Approach 1:
The patent enables the feedstock to self-organize and self-stabilize during the spray drying process. The protein-containing feedstock (with whey protein isolate, casein, or soy protein isolate) automatically undergoes conformational changes, aggregation, and crosslinking when exposed to spray drying conditions, forming stable microparticles without requiring external vibration or specialized nozzle mechanisms. This self-service approach achieves reliable microparticle formation using only conventional spray drying equipment.
Solution Approach 2:
The patent replaces the mechanical vibration system (specialized vibrating nozzles) with a chemical-thermal mechanism. Instead of using mechanical vibration to atomize and form droplets, the patent relies on the thermal and chemical properties of protein-containing feedstock, which undergoes temperature-dependent conformational changes and crosslinking during spray drying to form stable microparticles, thereby eliminating the need for complex mechanical vibration machinery.
3Reliability
If pre-heating and denaturation steps are added to the spray drying process, then protein matrix stability is improved, but processing time and energy consumption increase
Solution Approach 1:
The patent merges the pre-heating, denaturation, and microparticle formation steps into a single integrated spray drying operation. The feedstock containing whey protein isolate, casein, or soy protein isolate is directly sprayed and subjected to the necessary thermal treatment during atomization, allowing simultaneous droplet formation, protein denaturation, and microparticle stabilization in one continuous process, thereby eliminating separate pre-heating steps and reducing overall processing time.
Solution Approach 2:
The patent performs preliminary preparation of the feedstock by dissolving or dispersing the protein (whey protein isolate, casein, or soy protein isolate) in the liquid medium before spray drying. This preliminary action ensures the protein is properly solvated and positioned to undergo rapid conformational changes and crosslinking during the spray drying process itself, eliminating the need for separate pre-denaturation heating steps while still achieving stable protein matrix formation.
4Strength
If protein concentration in feedstock is increased to improve microparticle stability, then matrix strength is improved, but spray drying efficiency and active agent yield deteriorate
Solution Approach 1:
The patent optimizes the protein concentration parameter within a specific range (1-10% w/v of whey protein isolate, casein, or soy protein isolate). This parameter change balances two competing requirements: sufficient protein concentration to form a stable crosslinked matrix (providing mechanical strength and active agent entrapment), and low enough concentration to maintain feedstock fluidity for efficient spray atomization and drying. The optimal range achieves both matrix strength and spray drying efficiency, resulting in 70-80% active agent yield.
Solution Approach 2:
The patent creates local quality variations in the feedstock by distributing protein molecules (whey protein isolate, casein, or soy protein isolate) uniformly throughout the liquid phase at controlled concentrations. This uniform local distribution ensures that during spray drying, each droplet contains sufficient protein to form a stable matrix locally, while the overall feedstock maintains low enough viscosity for efficient atomization. This local quality control achieves both matrix strength and spray drying efficiency.
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
This method achieves a significant improvement in microparticle stability and active agent yield, with up to 80% of the active agent being retained in the microparticles, compared to the 11-13% yield in prior art, while using conventional spray drying technology and maintaining food-grade status.
Implementation Method 1
a volatile divalent metal salt that activates at elevated temperatures to crosslink and aggregate proteins
Implementation Method 2
a volatile divalent metal salt that activates at elevated temperatures to crosslink and aggregate proteins
Implementation Method 3
Method of producing microparticles by spray drying
Data Source
AI summary
A method of producing microparticles by spray drying comprises the steps of providing a spray-drying feedstock solution comprising water, a volatile divalent metal salt, weak acid, 5-15% dairy or vegetable protein (w/v) and 1-20% active agent (w/v). The feedstock solution is adjusted to have a pH at which the volatile divalent metal salt is substantially insoluble. The feedstock solution is then spray-dried at an elevated temperature to provide atomised droplets, whereby the volatile divalent metal salt disassociates at the elevated temperature to release divalent metal ions which crosslink and aggregate the protein in the atomised droplets to produce microparticles having a crosslinked aggregated protein matrix and active agent dispersed throughout the matrix.