Encapsulating Volatile Compounds Using Salt-Saturated Aqueous Loading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Volatile, water-soluble flavor and fragrance compounds like butyric acid, acetaldehyde, acetic acid, diacetyl, and furfuryl alcohol are difficult to encapsulate effectively in microcapsules due to their partition coefficient, leading to substantial loss during recovery as they tend to remain within the hydrogel shell rather than being absorbed into the oily interior.
Innovation Solution
The method involves immersing hydrogel capsules with an oily interior in an aqueous solution of the volatile substance, saturated with a non-volatile, water-soluble material, to facilitate loading, and optionally adding a desiccating agent like potato starch to enhance retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional aqueous diffusion loading is used, then the process is simple and general, but volatile water-soluble substances remain trapped in the hydrogel wall rather than being absorbed into the oil core
Solution Approach 1:
The invention changes the chemical parameters of the aqueous solution by adding water-soluble salts (such as sodium chloride, potassium chloride, calcium chloride) to modify the partition coefficient equilibrium. This parameter change alters the distribution behavior of volatile water-soluble substances, driving them from the hydrogel wall into the oil core, thereby resolving the contradiction between loading efficiency and volatile loss.
Solution Approach 2:
The invention introduces water-soluble salts as intermediary substances in the aqueous loading solution. These salts act as mediators that modify the chemical environment and partitioning behavior, facilitating the transfer of volatile substances into the oil core while preventing their entrapment in the hydrogel wall, thus reducing volatile loss during recovery.
2Quantity of substance
If loading time is extended to improve loading extent, then more substance is loaded, but volatile loss increases due to prolonged exposure
Solution Approach 1:
By changing the chemical parameters of the loading solution (adding salts to saturation), the invention accelerates the partitioning process. This allows achieving the desired loading extent in shorter times, reducing volatile loss while maintaining high loading efficiency.
3Loss of substance
If hydrogel shell composition is modified to improve volatile retention, then retention increases, but loading efficiency may be affected
Solution Approach 1:
Instead of modifying the hydrogel shell, the invention uses water-soluble salts in the loading solution as intermediaries to control substance distribution. This approach achieves improved volatile retention without affecting the hydrogel composition or loading 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 high loading efficiency and improved retention of volatile substances, significantly reducing loss over time, particularly for substances previously difficult to encapsulate like acetaldehyde, as demonstrated by comparative testing.
Implementation Method 1
The water allows the transport of the substances through the water-containing hydrogel shell into the oil core by aqueous diffusion according to its partition coefficient equilibrium
Implementation Method 2
the aqueous solution additionally comprising dissolved therein to saturation point at least one water-soluble, non-volatile material that is soluble in the aqueous solution
Data Source
AI summary
A method of encapsulating a volatile, water-soluble substance in capsules having a hydrogel shell and an oily interior includes (i) providing blank capsules having a hydrogel shell and an oily interior and (ii) immersing the capsules in an aqueous solution of the volatile, water-soluble substance for a time sufficient for them to load to a desired extent with the volatile, water-soluble substance. The aqueous solution additionally has dissolved therein to saturation point at least one water-soluble, non-volatile material. The method permits the easy and durable encapsulation of volatile materials that hitherto have been difficult to encapsulate.