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Artificial muscle based on natural proteins

02.02.2022

Researchers from the University of Freiburg (Germany) have developed an artificial muscle based solely on natural proteins. Muscle contractions can be controlled by changes in the acidity of the environment and temperature.

The material the scientists used is based on elastin, a natural fibrous protein also found in humans that gives elasticity to the skin and blood vessels. Researchers have developed two elastin-like proteins, one of which responds to fluctuations in acidity (pH) and the other to changes in temperature. The scientists combined the two proteins using photochemical cross-linking to form a bilayer material.

So, in response to changes in the pH level in the aquatic environment where the material was placed, or temperature, the artificial muscle was able to contract rhythmically. In the case of temperature changes, the chemical reaction started at about 20 degrees Celsius. In this case, it was possible to program certain muscle states and reset them again with another stimulus.

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SpaceX's first flight to Mars was scheduled for 2018, but last month, company president Gwynne Shotwell said it likely won't happen until mid-2020. The delay is not due to any problems with the mission or the Red Dragon missile, Wooster said.

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