Natural Starch Microsphere Preparation via Gelatinization and Vacuum Dehydration
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Solution Overview
Problem
Existing methods for preparing starch microspheres face challenges in achieving uniform particle size and regular shapes, while also retaining the molecular structure of natural starch and ensuring high yield.
Innovation Solution
A method involving natural starch gelatinization, droplet dispersion in an oil phase, and vacuum dehydration is used to prepare starch microspheres with uniform particle size and regular shapes, avoiding hydrolysis and cross-linking of starch molecular chains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If natural starch is processed into microspheres using existing methods (physical grinding, chemical hydrolysis, spray-drying, or inverse emulsion), then starch microspheres can be obtained, but the particle size becomes non-uniform and the molecular structure of starch is compromised
Solution Approach 1:
The invention changes the physical state and processing parameters of starch by utilizing its gelatinization properties. Starch is gelatinized at controlled temperatures (60-100°C) for specific times (1-30 minutes) to achieve the right viscosity and molecular conformation, then rapidly cooled and frozen at -70°C to -20°C. This parameter control enables uniform microsphere formation (0.1-10 μm) while preserving the starch molecular structure, avoiding the non-uniform particle size and molecular degradation seen in conventional methods.
Solution Approach 2:
The invention exploits phase transitions of starch during gelatinization and freezing. Starch undergoes gelatinization transition from crystalline to amorphous state, then rapid freezing transitions from liquid gelatinization solution to solid microsphere. This phase transition mechanism, combined with controlled heating and cooling rates, produces uniform microspheres with preserved molecular structure, eliminating the need for chemical hydrolysis or complex emulsion processes that compromise starch integrity.
2Manufacturing precision
If chemical cross-linking agents are used to form starch microspheres, then microspheres can be produced, but the molecular structure is altered and residual components limit application in food and medicine
Solution Approach 1:
The invention extracts and eliminates the need for chemical cross-linking agents from the microsphere formation process. By utilizing physical gelatinization and freezing of starch in aqueous solution, the method achieves microsphere formation without introducing external chemical substances. This extraction of harmful agents enables the starch microspheres to be suitable for food and medical applications where chemical residues would be problematic.
Solution Approach 2:
The invention applies self-service by using starch's own gelatinization and freezing properties to form microspheres without external chemical agents. The starch molecules themselves undergo structural changes during gelatinization and reorganization during freezing to create the microsphere structure. This self-assembly mechanism eliminates the need for cross-linking agents, ensuring purity and safety for food and medical uses.
3Manufacturing precision
If spray-drying method is used to prepare starch microspheres, then microspheres can be obtained, but high energy consumption and equipment requirements are needed
Solution Approach 1:
The invention replaces the mechanical spray-drying system with a simple aqueous solution freezing method. Instead of using high-pressure nozzles, heated air streams, and complex drying equipment, the method merely requires mixing starch with water, controlling gelatinization temperature (60-100°C) for 1-30 minutes, then freezing at -70°C to -20°C. This substitution of mechanical/thermal drying with controlled freezing dramatically reduces energy consumption and equipment requirements while maintaining microsphere production.
4Manufacturing precision
If physical grinding method is used to prepare starch microspheres, then microspheres can be obtained, but energy consumption is high and particle size is large and uneven
Solution Approach 1:
The invention changes the fundamental processing parameter from mechanical force to thermal and phase control. Instead of applying mechanical grinding force that consumes high energy and produces uneven particles, the method controls temperature parameters (gelatinization at 60-100°C, freezing at -70°C to -20°C) and time parameters (1-30 minutes gelatinization, then freezing). This parameter-based approach produces uniform microspheres (0.1-10 μm) with low energy consumption and regular shapes.
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 starch microspheres with a yield greater than 95%, uniform particle size, regular shapes, and complete retention of the natural starch molecular structure, enabling effective loading of water-soluble and fat-soluble objects.
Implementation Method 1
heating a mixture of natural starch and water for gelatinization to form a water phase
Implementation Method 2
treating the mixed solution obtained in step S3 under reduced pressure, and separation to obtain preliminarily solidified starch microspheres
Data Source
AI summary
The present disclosure provides a method for preparing natural starch microspheres with a uniform particle size. The method includes the following steps: heating natural starch and water for gelatinization to form a water phase; controlling a temperature of a substance including a low-polarity solvent to form an oil phase; dispersing the water phase into the oil phase to obtain a mixed solution; treating the mixed solution under reduced pressure, and carrying out separation to obtain preliminarily solidified starch microspheres; and washing the preliminarily solidified starch microspheres to remove the residual oil phase on the surface, and drying to obtain the natural starch microspheres. Compared with the present technology, the method of the present disclosure can retain the molecular structure of the natural starch and has a high yield, and the prepared natural starch microspheres have a uniform particle size and can load water-soluble and fat-soluble loading objects.