Core-Shell Probiotic Microcapsules for Uniform Particle Sizing
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Solution Overview
Problem
Current methods for producing probiotic microcapsules are inefficient, result in large particle sizes, require excessive oil, or lead to high bacterial inactivation, making them unsuitable for large-scale production and effective delivery through the digestive tract.
Innovation Solution
A method involving mixing probiotic powder with microcrystalline cellulose and starch, followed by extrusion spherization and atomization coating to create core-shell microcapsules with controlled particle size and gastric acid resistance, using materials like hydroxypropyl methylcellulose and chitosan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If extrusion method is used to produce microcapsules, then production efficiency is improved, but particle size becomes large and uniformity decreases
Solution Approach 1:
The extrusion process is segmented into multiple stages with different rotational speeds. The extrusion rod rotates at 10-100 rpm to form initial structures, while the spheroidizing rod rotates at 1500-2000 rpm to refine and uniform the particle shapes. This segmented approach allows both high productivity and uniform particle size distribution.
2Ease of manufacture
If emulsification method is used, then microcapsule formation is achieved, but large amount of oil is required making separation difficult and steps cumbersome
Solution Approach 1:
The invention extracts and removes the oil phase from the emulsification process. Instead of using oil as a continuous phase, the method uses water-soluble polymers (HPMC, chitosan) to form the capsule wall material, completely eliminating the need for oil separation steps and reducing process complexity.
Solution Approach 2:
The invention changes the chemical parameters of the capsule wall material from oil-based to water-based polymers. By using HPMC and chitosan solutions instead of oil, the system achieves microcapsule formation without requiring subsequent oil separation, fundamentally altering the process parameters.
3Productivity
If spray drying method is used, then microcapsule production is achieved, but large number of viable bacteria die due to high temperature
Solution Approach 1:
The invention changes the temperature parameter from high-temperature spray drying to low-temperature extrusion. The process is conducted at ambient or refrigerated temperatures, preserving bacterial viability while still achieving microcapsule formation through the phase behavior of the polymer solutions.
Solution Approach 2:
The invention introduces water-soluble polymers (HPMC, chitosan) as intermediary materials that enable microcapsule formation without high temperature. These polymers form gel structures through cooling or pH changes rather than thermal processing, serving as a mediator that protects bacteria while enabling encapsulation.
4Ease of manufacture
If conventional microcapsule methods are used, then encapsulation is achieved, but resistance to gastric acids and targetability to intestinal tracts is insufficient
Solution Approach 1:
The invention uses composite capsule wall materials combining HPMC and chitosan. Chitosan provides gastric acid resistance through its chemical structure, while HPMC provides structural integrity. This composite material system simultaneously achieves encapsulation and gastric protection that conventional single-material methods cannot provide.
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 produces uniform, stable microcapsules with high encapsulation efficiency, resistance to gastric acids, and targetability to the intestinal tract, suitable for industrial production of probiotic health products.
Implementation Method 1
first extruding the mixture materials at a speed of 10-100 rpm, then spheroidizing them into spherical particles at a speed of 1500-2000 rpm
Implementation Method 2
spheroidizing them into spherical particles at a speed of 1500-2000 rpm
Implementation Method 3
coating the microcapsule cores with a coating material solution in a single layer or multiple layers by atomization
Data Source
AI summary
The invention provides a Probiotic microcapsule and a preparation method thereof, relating to the technical field of Probiotic products. The method includes the following steps: (a) preparing a capsule core containing Probiotics: mixing the capsule core materials including Probiotic powder, microcrystalline cellulose and starch, then adding a hydroxypropyl methylcellulose solution thereinto, while mixing evenly, making the obtained mixture materials into spherical particulate capsule cores by the extrusion spherization method; (b) coating by atomization: coating the microcapsule cores with a coating material solution in a single layer or multiple layers by atomization, getting core-shell microcapsules. The Probiotic microcapsules prepared by the present invention have a large encapsulation, uniform microcapsule particles, controllable particle size, storage-resistance, targetability to intestinal tracts, resistance to gastric acids and high temperature stability.