Fatty Acid Enteric Coating for Acid Protection and pH Release
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Solution Overview
Problem
Existing enteric coatings for pharmaceutical, nutraceutical, and food applications face challenges with high costs and regulatory hurdles, and natural alternatives often compromise acid protection and release properties.
Innovation Solution
A coating composition comprising a hydrophobic matrix of fatty acids and a water-soluble weak organic acid, which is protonated at low pH and deprotonated at neutral pH, providing acid stability and controlled release of active ingredients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional enteric coatings (hydroxypropylmethylcellulose phthalate, cellulose acetate phthalate, etc.) are used to protect active compounds from acidic degradation, then acid protection is achieved, but cost increases and regulatory hurdles arise
Solution Approach 1:
The patent changes the chemical parameters of the coating by using fatty acids with specific chain lengths (C14-C22) and combining them with weak organic acids that have specific pKa values. This parameter optimization enables the coating to provide acid protection while using more cost-effective and regulatorily friendly materials compared to conventional enteric coatings.
Solution Approach 2:
The patent creates a composite coating system combining fatty acids (hydrophobic matrix) with weak organic acids (pH-dependent solubility component). This composite material achieves both acid protection and controlled release properties while avoiding the need for expensive conventional enteric coating polymers.
2Ease of manufacture
If natural alternatives to conventional enteric coatings are used to reduce cost and regulatory issues, then cost and regulatory compliance improve, but acid protection and release properties are compromised
Solution Approach 1:
The patent optimizes the parameters of natural materials by selecting fatty acids with specific chain lengths (C14-C22) and weak organic acids with appropriate pKa values. This parameter tuning enables natural materials to achieve the required acid protection and release properties that previous natural alternatives failed to provide.
Solution Approach 2:
The patent develops a composite coating using natural fatty acids combined with weak organic acids. This composite formulation achieves superior acid protection and controlled release properties compared to single-component natural alternatives, while maintaining cost-effectiveness and regulatory advantages.
3Reliability
If the coating provides strong acid protection to protect active ingredients, then acid stability is improved, but release rate at neutral pH may be delayed
Solution Approach 1:
The patent uses weak organic acids with specific pKa values that are protonated at acidic pH (providing acid protection) but deprotonated at neutral pH (enabling rapid release). This parameter selection resolves the contradiction between acid stability and release speed by leveraging pH-dependent ionization.
Solution Approach 2:
The weak organic acid acts as an intermediary that mediates between the hydrophobic fatty acid matrix and the aqueous environment. It provides acid protection when protonated and facilitates rapid release when deprotonated, serving as a pH-responsive switch that coordinates both protection and release functions.
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 coating achieves >85% acid stability and >80% release within 3 hours at neutral pH, meeting regulatory requirements and ensuring effective protection and delivery of active compounds.
Implementation Method 1
In acidic conditions (e.g., pH≤3), the weak organic acid is protonated and its solubility limited
Implementation Method 2
at neutral to alkaline pH (e.g., pH 6 or higher) it is deprotonated and more easily solubilized, allowing for the release of the active ingredient
Implementation Method 3
a hydrophobic matrix of fatty acids
Data Source
AI summary
The present invention relates to a unique coating comprising a hydrophobic matrix of fatty acids and a water-soluble weak organic acid. During acidic conditions (e.g., pH≤3), the weak organic acid is protonated and is almost insoluble or slowly solubilized, while at neutral to alkaline pH (e.g., pH 6 or higher) it is deprotonated and more easily solubilized, allowing for the release of the active ingredient. All of the materials in the coating are soluble in organic solvents and, preferably, alcohols. In at least one embodiment, the coating is used as an enteric coating. In at least one embodiment, the coating is evenly dispersed without the inclusion of a plasticizer, emulsifier, or emulsifying agent.