Keratin Lanthionization Under Mild Conditions to Preserve Elasticity
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Solution Overview
Problem
Existing methods for treating keratin-containing materials, such as wool, using lanthionization in cosmetic treatments result in fragile or degraded products, and lack control over the formation of sulfonic acid groups and molecular weight, limiting their application in biomedical and other fields.
Innovation Solution
A process involving partial lanthionization of cystine disulfide bonds in keratin-containing materials under mild conditions, specifically at ambient temperature and in non-aqueous or semi-aqueous media, using hydroxide bases like NaOH or KOH, to create permanent thioether linkages, which can be further oxidized to control sulfonic acid groups and molecular weight, enhancing material properties like elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If lanthionization is performed under conventional conditions (aqueous medium, elevated temperature, external agitation), then the reaction proceeds efficiently, but the keratin material becomes fragile and degraded
Solution Approach 1:
The patent changes the physical and chemical parameters of the reaction medium from aqueous to non-aqueous (using solvents like ethanol, methanol, acetone, or their mixtures with water). This parameter change allows the lanthionization reaction to proceed while preserving keratin material integrity, preventing the fragility and degradation that occurs under conventional aqueous conditions
Solution Approach 2:
The patent introduces a new dimension to the reaction conditions by using non-aqueous media instead of traditional aqueous solutions. This dimensional change in the reaction environment fundamentally alters the reaction pathway and product characteristics, enabling controlled lanthionization without material degradation
2Reliability
If oxidation is performed to break cystine bonds, then the reaction is irreversible and controls subsequent oxidation, but the material becomes too fragile for certain applications
Solution Approach 1:
The patent applies partial lanthionization rather than complete oxidation of cystine bonds. By performing partial conversion to lanthionine under controlled non-aqueous conditions, the patent achieves sufficient control over subsequent oxidation while avoiding the excessive damage and fragility that results from complete oxidation
Solution Approach 2:
The patent uses non-aqueous solvents as intermediary media to facilitate the lanthionization reaction. These solvents act as intermediaries that enable the reaction to proceed controllably without directly causing the material degradation that occurs with conventional aqueous oxidation methods
3Adaptability or versatility
If lanthionization is applied to raw keratin materials, then new biomaterials can be prepared, but the process lacks control over molecular weight and sulfonic acid group formation
Solution Approach 1:
The patent employs controlled lanthionization conditions that provide feedback mechanisms for regulating the reaction extent. By monitoring and controlling parameters such as solvent composition, temperature, and reaction time in non-aqueous media, the patent achieves precise control over molecular weight and sulfonic acid group formation, enabling tailored biomaterial production
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 process yields keratin materials with improved elasticity and controlled sulfonic acid groups, allowing for higher molecular weight derivatives and tailored biomaterials suitable for various applications, including biomedical uses, by preserving crosslinks and reducing the formation of insoluble fractions.
Implementation Method 1
A process is provided for the conversion of the disulfide groups (R—S—S—R) of the cystine residues in keratin to lanthionine residues (thioether groups, R—S—R)
Implementation Method 2
The lanthionized material may then be oxidized to produce cysteic acid groups from at least a portion of the remaining cystines
Implementation Method 3
The residual H2S is removed by washing with water and by vacuum drying
Data Source
AI summary
Useful materials are produced from keratin containing raw materials by a process that includes gentle lanthionization of cystine disulfide bonds. Hydratable materials are produced for use in medical and cosmetic applications.