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Silk Film Culture System for in vitro Analysis and Biomaterial Design
Published on: April 24, 2012
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Novel silk fibroin films prepared by formic acid/hydroxyapatite dissolution method
Jinfa Ming1, Zhi Liu1, Shiyu Bie1
1National Engineering Laboratory for Modern Silk, Soochow University, Suzhou 215123, China; College of Textile and Clothing Engineering, Soochow University, Suzhou 215021, China.
Summary
A novel method dissolves Bombyx mori silk fibroin using formic acid and hydroxyapatite, creating silk fibroin nanofibers and films. This process enhances material properties for advanced biomaterial applications.
Area of Science:
- Biomaterials Science
- Materials Chemistry
- Polymer Science
Background:
- Silk fibroin (SF) is a natural polymer with excellent biocompatibility and mechanical properties.
- Developing novel dissolution methods for SF is crucial for advanced material fabrication.
- Existing SF dissolution methods often involve harsh chemicals or limited structural control.
Purpose of the Study:
- To investigate a new method for dissolving Bombyx mori silk fibroin using a formic acid/hydroxyapatite (HAp) system.
- To characterize the rheological properties, morphology, and structural behavior of SF solutions and films prepared by this method.
- To evaluate the potential of this novel SF dissolution method for creating advanced biomaterials.
Main Methods:
- Dissolution of Bombyx mori silk fibroin in a formic acid/hydroxyapatite system.
- Rheological analysis of the resulting silk fibroin solutions.
- Morphological characterization using electron microscopy to observe silk fibroin nanofibers.
- Structural analysis of silk fibroin films using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Differential Scanning Calorimetry (DSC).
- Mechanical testing of the prepared silk fibroin films.
Main Results:
- Silk fibroin was successfully dissolved in the formic acid/hydroxyapatite system, yielding solutions with observable silk fibroin nanofibers (103.6±20.4nm diameter).
- The rheological behavior of the SF solution was significantly influenced by HAp content.
- Silk fibroin films exhibited a Silk II (β-sheet) secondary structure, largely unaffected by HAp content.
- XRD, FTIR, and DSC confirmed the presence of HAp in SF films, with some conversion to calcium hydrogen phosphate dehydrate at 5.0wt.% HAp.
- SF films prepared via this method demonstrated improved breaking strength and extension at break.
Conclusions:
- A novel and effective method for dissolving Bombyx mori silk fibroin using formic acid and hydroxyapatite has been established.
- This dissolution process yields silk fibroin nanofibers and films with enhanced mechanical properties.
- The findings offer a new approach for designing and synthesizing advanced silk fibroin-based materials for diverse applications, particularly in biomaterials.
