Abstract
Rose-scented geranium (Pelargonium sp.) have been the subject of many studies concerning essential oil, unlike the edible flowers of scent Pelargonium despite the beneficial properties of chemical compounds present in such organ and the fragrances produced. Therefore, we investigated organic compounds, total phenols and the antioxidant activity of the flowers with particular attention to the volatile compounds emitted by flowers of Pelargonium ‘Endsleigh’ at three stages of development. We identified several major phenols and organic compounds that revealed significative difference compared with other Pelargonium flowers, and employing the solid-phase micro extraction (SPME) methodology we determined that the production of volatile compounds decreases during the flower development. In addition, the emission of volatiles is accomplished mainly by the sepals. In conclusion, to use Pelargonium ‘Endsleigh’ flowers, it is important in ensuring that they have not yet opened and that the sepals are in place.
Highlights
Rose-scented geranium (Pelargonium sp.) have been the subject of many studies concerning essential oil, unlike the edible flowers of scent Pelargonium despite the beneficial properties of chemical compounds present in such organ and the fragrances produced
The vials were placed at 40 ◦ C for 5 min in a thermostatically controlled bath to allow the evaporation of the compounds; hereafter, a solid-phase micro extraction (SPME) syringe was inserted and the fibre (50/30 μm Divinylbenzene/Carboxen/Polydimethylsiloxane, Supelco/Merck KGaA, Darmstadt, Germany), which was previously conditioned for min at 235 ◦ C in the gas chromatograph injector, was exposed for 10 min to absorb the volatile compounds
There are some organic acids, such as tartaric and malic, and phenolic acids derived such as Monogalloylhexose and Methylated protocatechuic acid hexose
Summary
Rose-scented geranium (Pelargonium sp.) have been the subject of many studies concerning essential oil, unlike the edible flowers of scent Pelargonium despite the beneficial properties of chemical compounds present in such organ and the fragrances produced. We investigated organic compounds, total phenols and the antioxidant activity of the flowers with particular attention to the volatile compounds emitted by flowers of Pelargonium ‘Endsleigh’ at three stages of development. Flowers are the reproductive organs of angiosperms and have the task of facilitating sexual reproduction To attract pollinators, they produce bright colours and volatile compounds together with abundant pollen and nectar, which are the reward for pollinators attracted by the colours and fragrant compounds. ‘Scented Pelargonium’ (historically scented geraniums) indicates a group of aromatic plants in which the leaves and flowers have many uses in recipes, aromatherapy, herbal and medicinal preparations [4,5,6]
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