Biological Tissue Decellularization Using Lipopeptide Detergents
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Solution Overview
Problem
Existing methods for preparing biological tissue for artificial heart valves fail to thoroughly remove cellular components while preserving the tissue's mechanical stability and structure, leading to potential calcification and rejection issues.
Innovation Solution
Decellularization using a detergent with amphiphilic lipopeptides, such as surfactin, followed by cross-linking with agents like glutaraldehyde, to create a stable and non-immunogenic extracellular matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional detergents (e.g., deoxycholic acid, SDS) are used for decellularization, then cellular components are removed from the tissue, but the tissue structure and collagen fibers are damaged and mechanical properties deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the decellularization process by using lipopeptides with specific amphiphilic properties (hydrophilic head groups and hydrophobic fatty acid chains) at optimized concentrations (0.1-10 mg/mL), pH values (6.0-8.0), and temperatures (20-37°C). This parameter optimization enables effective cellular component removal while preserving collagen fiber integrity and tissue mechanical properties
Solution Approach 2:
Lipopeptides act as intermediary substances that mediate between the decellularization requirement (removal of cellular components) and tissue preservation requirement (maintaining collagen structure). The amphiphilic nature of lipopeptides allows them to interact with both cellular membranes (via hydrophobic interaction) and aqueous environments (via hydrophilic interaction), enabling gentle yet effective decellularization
2Reliability
If conventional detergents are used for decellularization, then cellular components are removed, but unwanted calcification occurs due to remaining cellular components
Solution Approach 1:
The patent applies extraction by removing cellular components (cell membranes, intracellular proteins, cell nuclei, and other cellular material) from the tissue through lipopeptide treatment. This extraction process leaves behind the pure extracellular matrix consisting primarily of collagen fibers, eliminating the cellular components that would otherwise serve as crystal nuclei for unwanted calcification
3Strength
If cross-linking is performed after decellularization, then mechanical properties and long-term stability are improved, but the tissue may be recognized as foreign material
Solution Approach 1:
The patent applies preliminary action by performing complete decellularization with lipopeptides before cross-linking. This preliminary removal of cellular components and cellular debris creates a clean extracellular matrix substrate that, when subsequently cross-linked, produces a biocompatible material that is less likely to trigger rejection reactions while maintaining improved mechanical properties
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 method ensures thorough decellularization with minimal structural damage, resulting in a tissue with improved mechanical properties and reduced calcification risk, suitable for long-term use in heart valve prostheses.
Implementation Method 1
the detergent for decellularization contains at least one lipopeptide having amphiphilic properties, comprising a hydrophilic base structure and a hydrophobic side chain
Implementation Method 2
The detergent according to the invention therefore contains at least one lipopeptide having amphiphilic properties
Implementation Method 3
the collagen fibers are cross-linked by means of a suitable cross-linking agent via the incorporation of chemical bonds. The cross-linking agent binds to the amino groups of the collagen fibers and forms chemically stable compounds between collagen fibers
Data Source
AI summary
A method for preparing tissue for medical applications, in particular tissue for use for an artificial heart valve, wherein the method has the steps of decellularizing the tissue by means of a detergent and subsequently cross-linking the collagen fibers of the tissue by means of a suitable cross-linking agent. At least one lipopeptide, such as surfactin, for example, is used as the detergent for decellularization.