Vitamin A Microcapsule Preparation via High Gravity Emulsification
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Solution Overview
Problem
Existing methods for preparing vitamin A microcapsules face issues such as high energy consumption, temperature-related instability, stratification during spray-drying, and difficulty in achieving nano-scale dispersion, leading to reduced bioavailability and stability.
Innovation Solution
A continuous method using a high gravity rotary packed bed emulsifier with nitrogen protection and gellable modified starch for emulsification and granulation, followed by fluidized drying and gelation, to produce stabilized vitamin A microcapsules with uniform particle size and enhanced storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-speed shearing and high-pressure homogenization are used for emulsification, then the emulsion can be prepared, but the motor power required and energy consumption become excessively high
Solution Approach 1:
The patent replaces the conventional high-speed mechanical shearing system with a high gravity rotary packed bed system that uses gravitational force and fluid dynamics to achieve emulsification. The liquid vitamin A passes through a packed bed of porous particles under high gravity conditions, creating intense mixing and emulsification without requiring high-power motors, thus dramatically reducing energy consumption while maintaining effective emulsion preparation.
2Ease of manufacture
If batchwise emulsification is performed in an open environment, then the emulsifying process can be completed, but the temperature at the shearing site becomes high causing vitamin A to perish
Solution Approach 1:
The patent conducts the emulsification process in a closed system under nitrogen atmosphere protection. The liquid vitamin A is handled and emulsified in an inert nitrogen environment, preventing oxidation and degradation of the heat-sensitive vitamin A compound while maintaining the emulsification process efficiency.
Solution Approach 2:
The patent implements continuous emulsification where liquid vitamin A continuously passes through the high gravity rotary packed bed system. This continuous flow process eliminates the batchwise heating issues, as the material moves quickly through the emulsification zone without prolonged exposure to elevated temperatures, thereby preserving vitamin A stability.
3Ease of manufacture
If batchwise operation is used, then the emulsification can be completed, but the emulsion is prone to stratify during spray-drying causing oil beads to coalesce
Solution Approach 1:
The patent employs continuous emulsification and continuous spray-drying operations. The freshly prepared emulsion is immediately fed into the spray-drying system without interruption or standing time, eliminating the stratification problem that occurs during batchwise operations. This continuous flow ensures uniform distribution of oil beads throughout the spray-drying process, preventing coalescence and maintaining emulsion stability.
4Ease of manufacture
If high-pressure homogenization is used, then the emulsion can be formed, but vitamin A cannot disperse into nano-scale dimensions affecting bioavailability
Solution Approach 1:
The patent replaces mechanical homogenization with a high gravity field-based dispersion system. Liquid vitamin A passes through a packed bed of porous particles under high gravity conditions (achieved by rapid rotation), creating intense shear forces and turbulence that break down oil droplets into nano-scale dimensions. This gravitational field approach achieves superior particle size control and nano-dispersion compared to conventional mechanical homogenization.
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 increases bioavailability, yield, and storage stability of vitamin A microcapsules by minimizing exposure to heat and oxygen, and providing double protection against moisture absorption, resulting in high retention rates over time.
Implementation Method 1
high gravity rotary packed bed emulsifier
Implementation Method 2
fluidized drying and gelation
Data Source
AI summary
A method for continuously preparing stable-type vitamin A microcapsules is disclosed. The method comprises the following steps: adding vitamin A crystals and an antioxidant into a crystal melter continuously according to a certain ratio under the protection of nitrogen to prepare vitamin A melting oil containing the antioxidant; pumping the above melting oil into a high gravity rotary packed bed emulsifier with a liquid distributor by a pump, and pumping aqueous solution containing gellable modified starch into the above high gravity rotary packed bed emulsifier after deoxidation treatment to obtain vitamin A emulsion at the outlet of the high gravity rotary packed bed emulsifier; and atomizing and spraying the emulsion continuously in a cooled starch bed for granulating, and performing fluidization drying and gelation treatment in a fluidized bed by taking nitrogen as a drying medium to obtain the stable-type vitamin A microcapsules. Above method has the advantage of capability of continuous production, and has good embedding effect due to adopting the gellable modified starch, granulating and gelation treatment, thus the product has good storage stability.