In a world first, CSIRO scientists have copied nature to produce a near-perfect rubber from resilin, the elastic protein which gives fleas their remarkable jumping ability and helps insects fly.
This important research breakthrough is reported in the latest edition of the respected international journal Nature (13 October 2005).
The high resilience of resilin – its capacity to recover after stress is applied – and the material’s extraordinary durability may have applications in industry and medicine. It could be used as a high efficiency rubber in industry, spinal disc implants, heart and blood valve substitutes, and perhaps even to add some extra spring to the heels of running shoes.
“Resilin has evolved over hundreds of millions of years in insects into the most efficient elastic protein known,” says CSIRO Livestock Industries principal scientist, Dr Chris Elvin, who leads the project.
“Everyone knows fleas jump like crazy and now, for the first time, we have replicated the material that enables them to do that.”
If humans could jump like fleas, we would be able to leap 100 story buildings. The durability and elasticity of resilin helps insects fly, enabling bees to flap their wings in almost frictionless motion 500 million times in a lifecycle.
“The resilin gene is turned off in adult insects, so there is no way of renewing their supplies,” says Dr Elvin.
“If you consider the number of contraction and extension cycles that resilin must accomplish during the course of an insect’s life, the fatigue lifetime of the material is extraordinary.
“Using a process we have patented, we developed a resilin rubber material which structural testing showed had a near perfect resilience,”
Dr Elvin says.
“Spinal disc implants need to last for 100 million cycles, which is roughly how many times we move our back in a lifetime, and we know resilin can last that long.”
Dr Elvin’s multi-disciplinary research team achieved a number of firsts with the research, which was funded by a CSIRO Emerging Sciences Area grant.
They were the first to clone a portion of the ‘resilin gene’ in the vinegar fly and express it in bacteria as a soluble protein. The team had, for the first time in the world, produced a purified resilin protein – but in a soluble form. The next challenge was to develop a technique to turn the soluble material into a solid form.
“Using a process we have patented, we developed a resilin rubber material which structural testing showed had a near perfect resilience,” Dr Elvin says.
This material displayed a 97 per cent recovery after stress was applied, far exceeding that of synthetic polybutadiene ‘superball’ high resilience rubber (80 per cent) and elastin (90 per cent).
Led by CSIRO Livestock Industries, the resilin project involved specialised input from CSIRO’s Divisions of Textile Fibre Technology, Manufacturing and Infrastructure Technology and Molecular and Health Technologies. Other key collaborators include the University of Queensland, Monash University and the Australian National University.
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