BIODIESEL made from soy and canola produces compounds that can cause serious respiratory disease, researchers say.
A team from the Queensland University of Technology says the discovery could lead to restrictions on the use of biodiesel as an alternative to fossil fuel.
The team looked at a range of biologists made from soy, tallow and canola.
They found that burning diesel fuels with a high percentage of biodiesel - up to 80 per cent - produced higher emissions of compounds linked to respiratory disease.
The compounds, called reactive oxygen species, form on surface of small soot particles in exhaust emissions.
Reactive oxygen species can lead to the cell damage called oxidative stress which, over long periods of time, can progress to serious respiratory disease.
Postdoctoral fellow Dr Nicholas Surawski says care must be taken to guard against respiratory illness that could result from new fuels.
"Now we've identified a component of the emissions that causes the problem we can start to look for solutions," Dr Surawski said in a statement on Wednesday.
The team is now trying to understand the way the reactive oxygen species in the emissions are generated, and how to remove them.
Their work is aimed at providing the transport industry with fuels that have a favourable environmental impact and are acceptable from a human health perspective.
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