About Botanical Oils
The use of botanical oils can be traced back thousands of years, with roots in cultures as diverse as the ancient Sumerians, Chinese and Roman Empire. Botanical oils are prepared from whole plant, preserving its scent, main active ingredients, and the essence of the plant. Botanical oils made from various plants have been used throughout history to honor gods, prepare bodies for funerals, preserve beauty, assist with hygiene and treat a wide variety of medical conditions.
Instructions for the preparation and use of plants as medicine is catalogued in the works of Dioscorides, De materia medica, back in the first century. Modern technology has allowed the active parts of plants to be identified and studied for their role in health and their usefulness against various medical conditions. The value of botanical oils has stood the test of time.
The Properties Of Oranges
The orange is believed to be a native of tropical areas in Asia, from which it spread to India, the east coast of Africa and the eastern Mediterranean. The development of Arab trade routes and the spread of Islam moved the orange around the globe. While the orange is a tropical fruit, the trees grow best where there is a light frost in the winter. The original name for the orange comes from the Sanskrit word “naranga,” which comes from the Tamil word “naru” meaning fragrant.
Type Of Oranges
Orange trees are the most commonly cultivated fruit tree in the world, and there are several varieties or cultivars of the orange, whose Latin name is Citrus sinensis. Different cultivars are grown based on how well they thrive at different times of the year and in different soil conditions. In the U.S., California primarily produces the “Washington Navel” and the “Valencia” cultivars and Florida produces the “Hamlin,” “Pineapple” and “Valencia.”
The popular cultivars listed above are sweet oranges valued for their juice. Around the world, bitter fruits are consumed to stimulate digestion. There are several sour orange varieties, including Citrus Aurantium grown in Vietnam, which is used in liquors including Triple Sec, Grand Marnier and Curacao. The Daidai, variety of C. Aurantium, is used therapeutically in Chinese and Japanese medicine and exchanged at the Japanese New Year to bring longevity.
The sour Seville orange is used in marmalades due to its high pectin content, and the chinotto orange is a flavoring in liqueurs including Campari. Orange oil is taken from the peels of several varieties, including the sweet Valencia orange, Citrus aurantium, and the sour Bergamot variety of orange, whose oil is a well known flavor in Earl Grey tea.
The orange is a famously bright orange, vitamin C-rich fruit, and indeed each cup of orange slices provides almost 100mg of vitamin C. Its lesser known nutrients include potassium, phosphorus, magnesium, folate and vitamin A.
The orange contains a range of fatty acids as well, mainly unsaturated fatty acids, including linoleic, palmitic, linolenic and vaccenic. The main alkaloid in bitter oranges is para-synephrine. Pectin is a water-soluble fiber that is found in fruits and vegetables. It is rich in the orange, some coming from the pulp of the orange, but more present in the peel. In the plant itself, pectin help bind the plant cells together, which supports the fruit’s shape.
Over time, enzymes from the plant will digest pectin, as you notice in a ripening fruit that is losing its rigidity. The range of pectin present in oranges ranges from 0.25 to 0.76 percent, a wide range dependent on the variety of orange and the ripeness of the fruit. Pectin, as a fiber source, lowers cholesterol and helps manage blood sugar.
Did You Know?
The fruit of the orange becomes ripe while the outside of the orange is still green. The practice of “degreening” the orange uses ethylene, the aging hormone of plants, to ripen oranges post-harvest, creating the bright orange color. Degreening needs to take place under carefully managed conditions, or it can lead to rotting and other problems for the fruit.
Orange Oil Preparation
The essential oils of the orange are taken from the bright orange peel. This outer peel of citrus fruits is called the “flavedo,” and it is covered with tiny glands. Each gland contains one drop of essential oil. To extract the organic oil, the peel must be physically broken open. The main components of orange oil are somewhat different between a sweet orange and a bitter orange oil.
Expression Or Cold Pressing
Expression refers to the process of slowly breaking down orange peel under mechanical pressure to release the oils from the glands of the peel. This is process uses ecuelle a piquer, or an apparatus designed to extract oils from fruit rinds.
It began in France as a bowl lined with needles to prick the fruit’s peel, and a funnel to collect the released oils. It has been modernized to accommodate commercial practices, but uses the same principles of poking and agitating the rind.
Bitter orange oils are obtained via cold pressing. Cold pressed means that the oil was expressed at a low temperature. The low temperature preserves the volatile oil, which provides the rich scent of the plant. The best yield from orange rinds appears to come when the peel has been dried first. The oil that is collected will range in composition, depending on the how mature the plant was and which variety of orange was used.
All varieties of orange produce volatile oils that are very rich in the monoterpene hydrocarbon, limonene. The flavor of the oil comes from its sesquiterpene hydrocarbons. Hesperidin and other flavonoids are abundant in the peels, but they break down quickly during processing.
Distillation extraction means exposing a plant to water or steam to break down the plant material and release the essential oil. The oils are cooled and condensed for collection. Distillation is used for orange extraction, using either the whole fruit or the peel.
Steam distilled orange peel oil will not contain the waxy residue that a cold-pressed oil would contain. This makes them less likely to clog oil diffusers, stain fabric and, as they are less biologically active, extends the shelf life. Distillation also allows the fucouramins to be removed from orange oils.
Furocoumarins have been found to be photocarcinogenic, which means that when these compounds are exposed to light, they can cause mutations in cells that lead to cancer. This helps with leave-on skin products that might be scented with orange oil. The toxicity is not observed in wash away products, but there is some evidence that drinking orange juice regularly causes the photosensitivity that can lead to skin cancer.
Medicinal Uses for Orange Oil
Questions About Orange Oil
What should I look for in an orange oil? Cold-pressed orange essential oils are generally pale in color, but may vary depending on the time of year and type of orange that was used. It should smell strongly like oranges, although neroli oil from bitter oranges may smell unlike the expected citrus aroma. If the oil has been distilled, it will be clear and may be thinner than a pressed oil, as all waxes and residues will have been removed in processing. If using it as a topical agent that will remain on the skin, look for a psoralen-free orange oil.
If I am allergic to citrus, can I use orange oil? If you have an allergy to any kind of citrus, or if you are not sure if you have a citrus allergy, orange oil should be avoided, even as a topical agent. The IgE reaction that occurs when someone has an orange allergy seems to cause a cross-reaction with pollen, so if you know you have a strong pollen allergy, talk to your doctor before trying citrus oil.
Is it safe to use orange oil on kids? Do not use orange oil on the skin of kids if they will be in the sun. It can raise their risk for sunburns and skin cancer. Orange, as a member of the citrus family, is a common allergen, so watch closely for signs of allergic reaction. Never use undiluted orange oil on the skin, and always watch for irritation when using any preparation with essential oils on the skin. Allergies can develop over time. Never give a child any essential oil internally. A drop of essential oil diluted in a carrier oil applied to the feet is sufficient to get the benefits for a child.
How long is the shelf life of orange oil? Kept under proper storage conditions, orange oil will only last about nine to 12 months. It should be stored in a dark bottle, and in a cool dark place since light and heat will oxidize it. Watch for clouding or an unpleasant smell as signs it has spoiled.
Can I use it on my skin? Orange oil alone is very irritating to the skin. Even when used a topical anti-fungal, it should be diluted to represent only 25 percent or less of the solution. Orange oil on the skin in the sun is photosensitizing, possibly increasing your risk of a sunburn, and photocarcinogenic, potentially increasing the risk of skin cancer. This will not occur from use of products that wash off, such as shampoo or soaps, as these do not leave the furocoumarins on the skin. Use caution with orange oils in products used on sun-exposed skin, such as lotions.
Caution And Considerations
Use caution with orange or any citrus oil on the skin. They are photosensitizing and can increase the risk of a sunburn or increase the risk of skin cancer. If you are at high risk for skin cancer, there may be reason to be cautious with orange juice consumption, as the oils present in the juice and pulp may be photosensitizing as well.
While orange juice is safe to drink, never take essential oils internally. Orange juice, like its fellow citrus member grapefruit, can have some effect on how you metabolize medications. If you are using medication, ask your doctor what a safe level of orange juice intake is for you.
 Bill T. Arnold, H. G. M. Williamson. Dictionary of the Old Testament: Historical Books. InterVarsity Press, Sep 26, 2011. P 33
 Elena Arena,Salvatore Campisi,Biagio Fallico, and, and Emanuele Maccaroneatty. “Fatty Acids of Italian Blood Orange Juices”. Journal of Agricultural and Food Chemistry 1998 46 (10), 4138-4143 DOI: 10.1021/jf980400u
 Brouns F, et al. “Cholesterol-lowering properties of different pectin types in mildly hyper-cholesterolemic men and women.” Eur J Clin Nutr. 2012 May;66(5):591-9. doi: 10.1038/ejcn.2011.208. Epub 2011 Dec 21. http://www.ncbi.nlm.nih.gov/pubmed/22190137
 Port, Ron. Degreening of citrus fruit. Tree and Forestry Science and Biotechnology 2 (Special Issue 1) 71-76. Global Science Books. 2008.
Ashutosh, Kar. Pharmacognosy And Pharmacobiotechnology. New Age International. 2003. P. 284.
 Manthey J, Grohmann K. “Concentrations of Hesperidin and Other Orange Peel Flavonoids in Citrus Processing Byproducts”
- Agric. Food Chem., 1996, 44 (3), pp 811–814 DOI: 10.1021/jf950572g
 Osterwell, Neil. "Citrus Fruit and Melanoma: Is There any Link?" 30 June 2015. Medscape Multispeciality. 2 July 2015. http://www.medscape.com/viewarticle/847208
 Pitchford, Paul. Healing with Whole Foods: Asian Traditions and Modern Nutrition. North Atlantic Books. Berkeley, CA. 1993, p 432.
 Oikeh, Ehigbai I. et al. “Phytochemical, Antimicrobial, and Antioxidant Activities of Different Citrus Juice Concentrates.” Food Science & Nutrition 4.1 (2016): 103–109. PMC. Web. 17 Apr. 2016.
 Ramadan W, et al. “Oil of bitter orange: new topical antifungal agent.” Int J Dermatol. 1996 Jun;35(6):448-9. http://www.ncbi.nlm.nih.gov/pubmed/8737885
 Nannapaneni R. “Campylobacter and Arcobacter species sensitivity to commercial orange oil fractions.” Int J Food Microbiol. 2009 Jan 31;129(1):43-9. doi: 10.1016/j.ijfoodmicro.2008.11.008. Epub 2008 Nov 14. http://www.ncbi.nlm.nih.gov/pubmed/19070381
 J. Lehrner, G. Marwinski, S. Lehr, P. Johren, and L. Deecke, “Ambient odors of orange and lavender reduce anxiety and improve mood in a dental office,” Physiology and Behavior, vol. 86, no. 1-2, pp. 92–95, 2005.
 M. Jafarzadeh, S. Arman, and F. F. Pour, “Effect of aromatherapy with orange essential oil on salivary cortisol and pulse rate in children during dental treatment: a randomized controlled clinical trial,” Advanced Biomedical Research, vol. 2, article 10, 2013.
 P.-H. Hu, Y.-C. Peng, Y.-T. Lin, C.-S. Chang, and M.-C. Ou, “Aromatherapy for reducing colonoscopy related procedural anxiety and physiological parameters: a randomized controlled study,” Hepato-Gastroenterology, vol. 57, no. 102-103, pp. 1082–1086, 2010.
 Hashemi, Mohammad et al. “Effect of the Peels of Two Citrus Fruits on Endothelium Function in Adolescents with Excess Weight: A Triple-Masked Randomized Trial.” Journal of Research in Medical Sciences : The Official Journal of Isfahan University of Medical Sciences 20.8 (2015): 721–726. PMC. Web. 17 Apr. 2016. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4652303/
 Stohs SJ, Preuss HG, Shara M. A Review of the Human Clinical Studies Involving Citrus aurantium (Bitter Orange) Extract and its Primary Protoalkaloid p-Synephrine. Int J Med Sci 2012; 9(7):527-538. doi:10.7150/ijms.4446. Available from http://www.medsci.org/v09p0527.htm