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Improved sample preparation of biomaterials for in vitro genotoxicity testing using reference materials.
Boris P Müller1, Silke Ensslen, Wolfgang Dott
1IZKF Biomat., Universitätsklinikum RWTH Aachen, Pauwelsstr. 30, 52074, Germany. boris.mueller@post.rwth-aachen.de
Journal of Biomedical Materials Research
|May 10, 2002
Summary
New reference materials help assess biomaterial safety. Organic solvents effectively extract genotoxic substances, but current testing guidelines may need revision for accurate in vitro genotoxicity evaluation.
Area of Science:
- Biomaterials Science
- Toxicology
- Medical Device Evaluation
Background:
- Biomaterials require rigorous safety testing, including genotoxicity assessment.
- Existing methods for in vitro genotoxicity testing of biomaterials face challenges with extraction and sensitivity.
- Standardized reference materials are needed to validate these testing protocols.
Purpose of the Study:
- To develop and utilize novel biomaterial reference materials with known genotoxic properties.
- To investigate optimal sample preparation methods for in vitro genotoxicity testing of biomaterials.
- To evaluate the adequacy of current ISO 10993 guidelines for biomaterial genotoxicity assessment.
Main Methods:
- Incorporation of benzo[a]pyrene, a genotoxic substance, into Tecoflex polyurethane.
- Extraction of benzo[a]pyrene using organic solvents and cell culture medium, with variations in extraction frequency and solvent volume.
- In vitro genotoxicity testing using the Mammalian Cell Gene Mutation Test (HPRT), Mammalian Chromosome Aberration Test, and bacterial umu- and SOS-tests.
- Concentration of extracts to overcome test system sensitivity limitations and manage cytotoxicity.
Main Results:
- Organic solvents efficiently extracted benzo[a]pyrene from the biomaterial reference material.
- Cell culture medium extracted limited quantities of benzo[a]pyrene; repeated medium changes increased extraction yield.
- Higher organic solvent-to-material surface area ratios improved benzo[a]pyrene recovery.
- Cytotoxicity often interfered with the evaluation of genotoxic effects in standard assays.
Conclusions:
- Established methods for extracting genotoxic substances from biomaterials using organic solvents are effective.
- Current ISO 10993 guidelines for biological evaluation of medical devices may be insufficient for in vitro genotoxicity testing.
- New standardized protocols are necessary for reliable in vitro genotoxicity assessment of biomaterials.