Polysaccharide Capsule Emulsion Gelation
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Solution Overview
Problem
Existing methods for preparing seamless capsules face challenges such as complex compositions, uneven wall thickness, and instability due to the use of gelatin derived from animal sources, which may not be suitable for all consumers and can be contaminated, and previous alternatives like alginate-based methods require excessive water, making them difficult to dry.
Innovation Solution
A method involving the preparation of emulsions with high oil content (at least 50% by weight) using an emulsifier and metal salts, which are then encapsulated in a polysaccharide gel membrane without marmelo mucilage, allowing for the creation of stable, robust seamless capsules with uniform wall thickness and the option for drying and coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gelatin is used as the capsule material, then the capsules have good film-forming properties and flexibility, but the capsules are unsuitable for consumers with religious or dietary restrictions and may be contaminated
Solution Approach 1:
The patent replaces animal-derived gelatin with plant-based polysaccharides (alginate, pectin, carrageenan) that are vegetarian-friendly and free from religious/dietary restrictions. These plant-based materials provide comparable film-forming properties without the contamination risks associated with animal sources.
Solution Approach 2:
The patent uses composite polysaccharide formulations combining multiple plant-based materials (alginate, pectin, carrageenan) to achieve the desired mechanical properties and film-forming capabilities previously provided by gelatin, while maintaining vegetarian compatibility and safety.
2Quantity of substance
If alginate-based methods are used to encapsulate high amounts of oil, then the oil entrapment capacity is improved, but the capsule walls become uneven in thickness
Solution Approach 1:
The patent optimizes the polysaccharide concentration, oil content, and crosslinking conditions to achieve uniform wall thickness while maintaining high oil entrapment capacity. By carefully controlling the alginate concentration (1-5% w/v) and crosslinking parameters, the method produces capsules with consistent wall thickness even at high oil loads (30-85% w/w).
3Quantity of substance
If complex formulations with multiple components are used to achieve high oil entrapment, then the oil capacity is improved, but the formulation complexity increases
Solution Approach 1:
The patent removes unnecessary complex components from the formulation by using simple polysaccharide solutions (alginate, pectin, or carrageenan) without requiring multiple additives, stabilizers, or specialized materials. The core formulation consists of essentially polysaccharide, water, and oil, achieving high oil entrapment through the inherent gelation properties of these simple materials.
4Reliability
If high water content is used in the capsule preparation, then the gel membrane formation is improved, but the capsules become difficult to dry
Solution Approach 1:
The patent optimizes the water content and polysaccharide concentration to achieve gel membrane formation with sufficient integrity while maintaining low enough moisture content for easy drying. The controlled gelation process and optimized formulation allow the capsules to be dried efficiently without compromising membrane strength.
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 enables the production of stable, seamless capsules with high oil content that are easy to dry and coat, offering improved stability and uniformity, suitable for various applications including pharmaceutical and nutraceutical uses, while avoiding animal-derived materials.
Implementation Method 1
preparing an emulsion of oil, water, an emulsifier, and at least one of a water-soluble monovalent metal salt, polyvalent metal salt, and an acid
Implementation Method 2
an emulsion of oil, water, an emulsifier
Implementation Method 3
adding portions of the emulsion to an aqueous gelling bath comprised of at least one ionic polysaccharide, thereby encapsulating the portions of emulsion in a polysaccharide gel membrane
Implementation Method 4
aqueous gelling bath comprised of at least one ionic polysaccharide, thereby encapsulating the portions of emulsion in a polysaccharide gel membrane
Implementation Method 5
drying the resulting capsules by removing water
Data Source
AI summary
The present invention is directed to seamless capsules and methods for making seamless capsules having a high oil content. More specifically, the present invention is directed to seamless capsules, and methods for making seamless capsules, made from a process involving the steps of: (a) preparing an emulsion comprising oil, water, an emulsifier, and at least one of a water-soluble monovalent metal salt, polyvalent metal salt, and an acid, wherein said oil is present in an amount of at least 50% by weight of said emulsion; with the proviso that said emulsion does not contain marmelo mucilage; and (b) adding portions of said emulsion to an aqueous gelling bath comprised of at least one ionic polysaccharide, thereby encapsulating said portions of said emulsion in a polysaccharide gel membrane, and optionally (c) drying the resulting capsules by removing water. The capsule is, for example, an alignate gel. The capsules of the invention are suitable for a variety of applications, e.g. pharmaceutical, nutraceutical, veterinary, agricultural, cosmetic, or food applications.