Essential oil

From Academic Kids

An essential oil, also known as volatile oil and ethereal oil, is a water-immiscible liquid produced by distillation from plant material that is used in perfumes, cosmetics, incenses, and in medicine.

Contents

Production

Raw plant material, consisting of the (flowers, leaves, stems, or roots, seeds, or seed peel, is put in an alembic over water, and the volatile compounds are vaporized. This is then put in a cooling tank and as the steam breaks down, the essential oil, which is lighter than steam, floats the upper portion of the cooled water. The water is referred to as the hydrosol, or plant water essence. Popular hydrosols are Rose Water, Lavender Water, and Orange Water. Most oils are distilled in a single process. The exception is ylang-ylang, which takes 22 hours to complete distillation. It is fractionally distilled, producing several grades.

Essential oil is always therapeutic grade until it is diluted with a carrier oil. Sweet almond oil, olive oil, hazelnut, and rosehip seed are examples of carrier oils. Since essential oils are so potent, many can irritate the skin unless diluted with a carrier oil. A home test to determine whether an oil is therapeutic grade is to place a drop on a coffee filter. Since the oil is a volatile substance, the oil will dissipate without leaving an oily residue on the paper.

Therapeutic grade is not a sole determination of quality. For example, Indian Sandalwood is considered more desirable than Australian Sandalwood, based upon the aroma; and is twice as costly, as Indian Sandalwood is endangered. Growing trend toward organic and wild harvested essential oils also effects the price and the quality.

Not all essential oils are distilled. Most citrus oils are expressed, or cold pressed from the peel. Some flowers contains very little oil and this requires a solvent is to extract the oil. The solvent dissolves the plant, and then alcohol is used to extract the essential oil from the rest of the plant material. Since the waxy covering of a jasmine petal is not alcohol soluble, it separates. The alcohol is removed by a second distillation, leaving behind the 'absolut. Hence, some essential oils such as jasmine and rose are labelled absolut.

Perfumery

Many essential oils are used in perfumery. The most well-known essential oil in perfumery is Rose, or Rose Absolut. Most production is harvested in Bulgaria and Morocco. Recently, China has begun cultivating Rose oil as well. It takes 6,000 pounds of rose petals to distill one ounce of essential oil. To mitigate the cost, Rose oil is often diluted with Geranium essential oil, at varying ratios of up to one drop of Rose to ten drops of Geranium. this is referred to as extending the Rose fragrance. Since Rose and Geranium are complementary, the extending process does not dilute the Rose fragrance dramatically.

Medicinal uses

Most essential oils have medicinal properties that have been applied in folk medicine since ancient times and are still widely used today. For example, most essential oils have antiseptic properties, though some are stronger than others. In addition, most have an uplifting effect on the mind, though different essential oils have different properties.

Popular oils

Aromatherapy is a form of alternative medicine, in which healing effects are ascribed to the smell of particular fragrances.

Prior to the discovery of distillation essential oils were extracted by pressing, and this is still the case in cultures such as Egypt. Traditional Egyptian practice involves pressing the flower and then burying it in unglazed ceramic vessels in the desert for a period of months to drive out water. The Lotus oil retaining its scent after 3000 years in alabaster vessels in Tutankhamun's tomb was pressed, rather than distilled.

Dangers

The smoke from burning essential oils may contain dangerous cancer producing products, such as polycyclic aromatic hydrocarbons (PAHs). The essential oils themselves are volatile organic compounds (VOCs). The use of essential oils should be avoided during pregnancy without consulting with a licensed professional, as some are aborticants.

Essential oils should not be applied directly to the skin due to their rapid absorption rate. Instead, essential oil should be applied with a carrier oil, such as olive, hazelnut, or any other "soft" oil. The ratio of essential oil disbursed in a carrier oil depends on its purpose.

While some advocate the ingestion of essential oils, this is generally not advisable.

Sources

References

Sellar, Wanda. The Directory of Essential Oils Essex: The C.W.Daniel Company, Ltd. Reprint, 2001. ISBN 0 85207 346 1

See also

External links

eo:Volatila oleo he:שמן אתרי io:Esencala oleo ja:精油 nl:Etherische olie sv:Eteriska oljor

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