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Chemical profile and eco-safety evaluation of essential oils and hydrolates from Cistus ladanifer, Helichrysum italicum, Ocimum basilicum and Thymbra capitata
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Abstract(s)
The demand for natural-based products for industrial applications is increasing sharply
and therefore the search for new alternatives to the plants traditionally used is growing.
These alternative plants can be an important source of bioactive compounds under a
circular economy approach. Considering the potential future use of new plant extracts
by the industry, it is necessary to assess the risk associated with their introduction into
the ecosystem. This work aims to provide an insight into the volatile profiles and
evaluate the potential (eco)toxic effects of essential oils (EO’s) and hydrolates of four
plant species, namely rockrose ( Cistus ladanifer ), curry plant ( Helichrysum italicum
), conehead thyme ( Thymbra capitata ) and basil ( Ocimum basilicum ). Chemical
analysis was performed by GC-MS and acute toxicity tests were performed using the
model organism Daphnia magna . The essential oil and the hydrolate from H. italicum
, as well as all the other hydrolates caused no immobilization up to the highest
concentrations tested, suggesting that all hydrolates present low to no risk towards D.
magna. Similarly, the essential oil of H. italicum , presented negligible risk towards
D. magna . For C. ladanifer and T. capitata essential oils, the EC 50 (the
concentration estimated to immobilize 50 per cent of the Daphnia ) at 48h varied from
199.7 mg/L and 12.05 mg/L, respectively. The essential oil from C. ladanifer was
mainly characterised by monoterpene hydrocarbons, while the H. italicum was richer
in sesquiterpene hydrocarbons. Both essential oil and hydrolate from T. capitata
contained exclusively monoterpene hydrocarbons with a particularly high content of
carvacrol. The higher acute toxicity of T. capitata essential oil can be attributed to the
high amount of carvacrol present in the distillate. Overall, of the essential oils and
hydrolates tested, all can be classified as practically non-toxic, except for T. capitata
essential oil that, according to the Globally Harmonized System of Classification and
Labelling of Chemicals (GHS) of the United Nations, can be classified as moderately
toxic
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Citation
FERRAZ, Celso Afonso [et al.] (2022) - Chemical profile and eco-safety evaluation of essential oils and hydrolates from Cistus ladanifer, Helichrysum italicum, Ocimum basilicum and Thymbra capitata. Industrial Crops and Products. ISSN 0926-6690. 175. DOI 10.1016/j.indcrop.2021.114232.