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Limonene Emissions: Do Different Types Have Different Biological Effects?

Neda Nematollahi¹, Perran A Ross², Ary A Hoffmann²

¹Department of Infrastructure Engineering, Melbourne School of Engineering, The University of Melbourne, Parkville, VIC 3010, Australia.

International Journal of Environmental Research and Public Health

|October 13, 2021

Summary

Synthetic R-limonene is more repellent to mosquitoes than natural R-limonene. Different limonene forms and sources may impact indoor air quality and health differently, warranting further study.

Keywords:

air quality attraction fragrance fragranced consumer products health limonene mosquitoes orange oil repellency

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Area of Science:

Environmental Science
Toxicology
Chemical Ecology

Background:

Limonene is a prevalent indoor air pollutant contributing to secondary pollutant formation.
Fragrance compounds like limonene in consumer products are linked to health concerns.
Enantiomeric forms (R-limonene, S-limonene) and sources of limonene may yield varied biological effects.

Purpose of the Study:

To investigate if different types of limonene elicit distinct biological responses at consistent concentrations.
To assess the differential repellency of various limonene sources and enantiomers.

Main Methods:

Utilized olfactometer tests with *Aedes aegypti* mosquitoes, known for their olfactory sensitivity.
Compared the repellency/attraction effects of synthetic and natural R-limonene.
Examined the repellency of synthetic R-limonene versus synthetic S-limonene.

Main Results:

Synthetic R-limonene demonstrated significantly higher repellency compared to natural R-limonene.
No significant difference in repellency was observed between synthetic R-limonene and synthetic S-limonene.
Mosquito olfactory responses varied based on limonene source and enantiomeric form.

Conclusions:

The source of R-limonene influences its repellent effect on *Aedes aegypti* mosquitoes.
Understanding limonene's source-dependent effects is crucial for assessing its impact on indoor air quality and human health.
Further research is needed to explore the broader implications of limonene's varied biological activities.