Hybrid Fragrance Encapsulation with Nested Core-Shell Capsules
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Solution Overview
Problem
Existing encapsulation methods for fragrances and flavors face challenges in maintaining droplet stability during spray-drying, especially when high amounts are involved, leading to inconsistent release profiles and environmental dependencies.
Innovation Solution
A hybrid encapsulate formulation is developed by preparing an aqueous starch solution, mixing it with an oil phase containing an active material, and incorporating a core-shell capsule suspension, followed by spray drying to create a formulation that can release fragrances through moisture or shear triggers, allowing for variable and multistage release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high amounts of fragrance oil are encapsulated in spray-dried capsules, then the fragrance loading is improved, but the droplet size stability deteriorates during the spray-drying process
Solution Approach 1:
The fragrance encapsulation system is divided into two distinct components: spray-dried starch capsules providing structural stability and core-shell capsules providing fragrance loading. This segmentation allows each component to optimize its function without compromising the other, resolving the contradiction between high fragrance loading and droplet size stability during spray-drying
Solution Approach 2:
Core-shell capsules are embedded within the spray-dried starch capsule matrix, creating a nested structure. The core-shell capsules contain the fragrance oil while the outer starch capsule provides structural stability during spray-drying. This nesting arrangement allows high fragrance loading within the core-shell capsules while maintaining overall droplet size stability during the spray-drying process
2Productivity
If spray-drying is used for encapsulation, then the manufacturing efficiency is improved, but the release profile consistency deteriorates due to environmental dependencies
Solution Approach 1:
The encapsulation system uses a composite structure combining spray-dried starch capsules with core-shell capsules. The starch component provides structural integrity and controlled release properties, while the core-shell capsules provide consistent fragrance encapsulation. This composite approach maintains manufacturing efficiency through spray-drying while improving release profile consistency by reducing environmental dependencies
Solution Approach 2:
The invention modifies the physical and chemical parameters of the encapsulation system by using cross-linked starch polymers with controlled molecular weights and degrees of substitution. These parameter changes create a more stable matrix that maintains consistent release profiles across different environmental conditions while preserving the manufacturing efficiency of spray-drying
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 hybrid encapsulate formulation provides controlled release of fragrances at different 'magic moments' by moisture or shear, enhancing consumer product performance across various environments.
Implementation Method 1
emulsifying the oil phase with an aqueous starch solution to obtain an emulsion
Implementation Method 2
spray drying the mixture to obtain a hybrid encapsulate formulation
Data Source
AI summary
A hybrid encapsulate formulation obtained by mixing a starch/fragrance emulsion with a core-shell capsule suspension is provided as is a method of using the formulation in a personal care product, a beauty care product, a fabric care product, a home care product, a personal hygiene product, an oral care product and a method for releasing an encapsulated fragrance by moisture, shear, or a combination thereof.