Osmotic Drying of All-Aqueous Emulsions for Biocompatible Particle Fabrication
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Solution Overview
Problem
Existing methods for converting emulsion droplets to solidified particles require intensive external energy inputs and additional steps, such as chemical crosslinking and drying processes, which are energy-intensive and time-consuming, and lack biocompatibility for encapsulating delicate active ingredients like biological cells and proteins.
Innovation Solution
The method employs an osmotic pressure gradient between the internal and external phases of an all-aqueous emulsion system to induce water extraction and solidification of droplets without external energy or chemical inputs, using osmolytes like PEG to control particle size, water content, and fabrication time, allowing for one-step fabrication of biocompatible solidified particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical crosslinking agents and UV crosslinking are used to convert emulsion droplets to solidified particles, then the solidification efficiency is improved, but the biocompatibility deteriorates due to harmful chemicals and intensive external energy inputs
Solution Approach 1:
The patent changes the physical-chemical parameters of the external phase by adjusting osmolyte concentration to create an osmotic pressure gradient, enabling solidification without harmful chemicals or intensive energy inputs, thus resolving the contradiction between solidification efficiency and biocompatibility
Solution Approach 2:
The patent replaces chemical crosslinking mechanisms and external energy fields (UV, heating) with an osmotic mechanism driven by concentration gradients, eliminating harmful factors while maintaining solidification effectiveness and improving biocompatibility
2Stability of the object's composition
If heating, vacuum drying, and freeze drying are used to convert emulsion droplets to solidified particles, then the solidification completeness is improved, but the energy consumption increases significantly
Solution Approach 1:
The patent employs osmosis-induced water extraction that occurs spontaneously due to the osmotic pressure gradient between internal and external phases, eliminating the need for external heating, vacuum, or freezing equipment, thus achieving solidification completeness with minimal energy consumption
Solution Approach 2:
The patent extracts water from the internal phase to the external phase through osmosis, directly removing the liquid component to achieve solidification without requiring energy-intensive drying processes, thereby reducing energy consumption while maintaining solidification completeness
3Stability of the object's composition
If multiple processing steps including chemical crosslinking and subsequent drying are used, then the particle solidification is improved, but the fabrication time increases
Solution Approach 1:
The patent merges the solidification and drying steps into a single osmotic dehydration process, where water extraction and particle solidification occur simultaneously in one step, eliminating the need for separate crosslinking and drying steps, thus reducing fabrication time while maintaining particle solidification quality
4Productivity
If intensive external energy inputs are applied to convert emulsion droplets to solidified particles, then the conversion efficiency is improved, but the bioactivity preservation deteriorates for delicate active ingredients
Solution Approach 1:
The patent replaces energy-intensive physical fields (heating, UV irradiation, vacuum) with a gentle osmotic mechanism driven by concentration gradients, achieving efficient conversion of emulsion droplets to solidified particles while preserving the bioactivity of delicate active ingredients through mild processing conditions
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 approach enables efficient, time-saving, and energy-efficient production of biocompatible solidified particles with high preservation of bioactivity and cell viability, reducing the need for additional processing steps and maintaining the integrity of encapsulated active ingredients.
Implementation Method 1
The conversion of the droplets to solidified particles can be achieved by the introduction of osmosis induced water extraction from the internal phase to the external phase
Implementation Method 2
osmosis-induced water extraction, i.e., osmotic dehydration, is now widely used in different fields, such as food preparations
Data Source
AI summary
A one-step method for fabricating solidified particles from all-aqueous emulsion droplets involves solidification and drying of the droplets by osmosis. According to this method the fabrication of solidified particles is induced by implementing a high osmotic pressure gradient between the internal phase and external phase of the all-aqueous emulsion. The resultant extraction of water leads to solidification of the emulsion droplets. This approach provides mild conditions for encapsulating bioactive ingredients or other delicate components to conveniently fabricate bio- and cyto-compatible particles because it does not involve the introduction of external energy used in conventional drying. Such conventional external energy inputs are time-consuming, so the method is more efficient.