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Related Concept Videos

Methods of Sterilization II: Chemical Methods01:30

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In healthcare, the chemical method of sterilization uses chemical sterilants to treat surgical instruments and medical supplies to help prevent the transmission of infectious pathogens to patients. Due to heat sensitivity, most medical supplies and equipment should not be exposed to high temperatures. These parts include rubber, plastic, glass, and other similar elements.
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As used in a healthcare facility, sterilization destroys all microorganisms through physical or chemical methods. The physical method includes steam, dry heat, boiling water, and radiation.
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Exploiting novel sterilization techniques for porous polyurethane scaffolds.

Serena Bertoldi1, Silvia Farè, Håvard Jostein Haugen

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Sterilizing porous polyurethane (PU) scaffolds with plasma or ozone for tissue engineering showed minimal impact on cell viability. Plasma sterilization preserved scaffold properties, while ozone altered morphology and mechanical strength.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Polymer Chemistry

Background:

  • Porous polyurethane (PU) scaffolds are crucial for tissue engineering.
  • Assessing sterilization effects on PU scaffold properties is vital for clinical application.

Purpose of the Study:

  • To evaluate the impact of plasma (Sterrad® system) and ozone sterilization on PU foam properties.
  • To assess the in vitro cytotoxicity of these sterilization methods on PU scaffolds.

Main Methods:

  • Gas foaming synthesis of PU foam using water as an expanding agent.
  • Morphological, chemico-physical (FTIR), and mechanical property analysis post-sterilization.
  • In vitro cytotoxicity testing using the Alamar Blue assay.

Main Results:

  • Plasma sterilization minimally affected PU foam morphology and mechanical properties but induced some degradation.
  • Ozone sterilization significantly altered foam morphology, increased pore formation, and caused more substantial degradation and oxidation.
  • Both sterilization methods demonstrated no significant cytotoxic effects, with good cell viability observed.

Conclusions:

  • Sterilization method choice is critical for maintaining PU scaffold integrity for tissue engineering.
  • Ozone sterilization poses a greater risk of material modification compared to plasma sterilization.
  • Understanding scaffold porosity's role in sterilization effects is key for developing safe and effective tissue engineering constructs.