Alpha-branched Acyl Carnitine Derivatives for Hydrolysis Resistance
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Solution Overview
Problem
Existing external skin preparations containing carnitine derivatives for stimulating lipid metabolism suffer from poor storage stability and short product life due to the hydrolysis of straight-chain acyl groups in water-based cosmetics, leading to inadequate skin affinity and percutaneous absorption.
Innovation Solution
Development of α-branched acyl carnitine derivatives such as L-carnitine 2-hexyldecanoate, L-carnitine 2-methylpalmitate, and L-carnitine 2-butyloctanoate, which are resistant to hydrolysis in aqueous media, enhancing stability and absorption properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If straight-chain acyl carnitine derivatives are used to stimulate lipid metabolism, then skin penetration and lipid metabolism stimulation effects are improved, but storage stability deteriorates due to hydrolysis in water-based products
Solution Approach 1:
The patent changes the chemical structure parameter of the acyl group from straight-chain to α-branched configuration. This structural modification fundamentally alters the hydrolysis resistance property, allowing the carnitine derivative to maintain stability in water-based cosmetic formulations while retaining skin penetration capabilities and lipid metabolism stimulation effects.
Solution Approach 2:
The patent creates a composite molecular structure by combining L-carnitine with α-branched acyl groups (such as 2-hexyldecanoate, 2-methylpalmitate, or 2-butyloctanoate). This composite structure integrates the beneficial properties of both components: the skin-penetrating and metabolically active carnitine core with the hydrolysis-resistant α-branched acyl side chain.
2Reliability
If L-carnitine and its salts are used in external skin preparations, then lipid metabolism stimulation is achieved, but percutaneous absorption properties deteriorate due to poor skin affinity
Solution Approach 1:
The patent modifies the physical-chemical parameters of carnitine by attaching α-branched acyl groups, which changes the molecular size, lipophilicity, and skin affinity characteristics. This parameter change enables better penetration through the skin barrier while maintaining the ability to stimulate lipid metabolism in target tissues.
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 novel carnitine derivatives provide superior storage stability and sustained lipid metabolism stimulation, ensuring effective skin penetration and prolonged activity in cosmetic formulations.
Implementation Method 1
α-branched acyl carnitine derivatives, particularly L-carnitine 2-hexyldecanoate, L-carnitine 2-methylpalmitate and L-carnitine 2-butyloctanoate, have superior stability in the presence of aqueous media
Implementation Method 2
the straight-chain acyl carnitine penetrates the skin and produces excellent effects of stimulating the lipid metabolism
Data Source
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AI summary
To provide novel carnitine derivatives and salts thereof that are resistant to hydrolysis in the presence of aqueous media, and also provide external skin preparations and cosmetics that are excellent in storage stability, product life, skin affinity and percutaneous absorption properties. In particular, to provide novel a-branched acyl carnitine derivatives and salts thereof, external skin preparations and cosmetics comprising specific a-branched acyl carnitine derivatives and/or salts thereof.