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Botanical Name :Citrus aurantium L.
Species: C. × aurantium
Synonyms : Citrus bigarradia – Loisel., Citrus vulgaris – Risso.
Common Names:Bitter orange, Seville orange, sour orange, bigarade orange, or marmalade orange
Habitat :Bitter oranges originate from northeastern India and certain regions of China and Myanmar. The fruit has spread to the rest of the world by the 1st century CE, when the Romans first started cultivating bitter oranges to use them in natural remedies and as a delicious treat. With fall of Roman Empire, the cultivation of Bitter Orange has staggered for a while in Europe. It was the Arabs who spread it all the way to Spain, where they grow even today, lining the streets and spreading the wonderful aroma of the fresh citrus blossoms. Some of these trees are more than 600 years old, but oldest live bitter orange tree is supposedly one planted back in 1421, and still growing at the Palace of Versailles outside Paris.
When the Americas were discovered, Spanish people brought the seeds of bitter orange to North America, namely to Florida and the Bahamas. Florida is today known as the world’s largest producer of oranges, and the fragrant blossoms of the orange tree are listed as Florida state symbols.
An evergreen Tree growing to 9m by 6m.
It is hardy to zone 9 and is frost tender. It is in leaf all year, in flower from April to June. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Apomictic (reproduce by seeds formed without sexual fusion), insects. The plant is self-fertile.
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The plant prefers medium (loamy) and heavy (clay) soils and requires well-drained soil. The plant prefers acid and neutral soils and can grow in very alkaline soil. It cannot grow in the shade. It requires moist soil.
*Citrus x aurantium subsp. amara is a spiny evergreen tree native to southern Vietnam, but widely cultivated. It is used as grafting stock for citrus trees, in marmalade, and in liqueur such as triple sec, Grand Marnier and Curaçao. It is also cultivated for the essential oil expressed from the fruit, and for neroli oil and orange flower water, which are distilled from the flowers.
*Seville orange (or bigarade) is a widely-known, particularly tart orange which is now grown throughout the Mediterranean region. It has a thick, dimpled skin, and is prized for making marmalade, being higher in pectin than the sweet orange, and therefore giving a better set and a higher yield. It is also used in compotes and for orange-flavored liqueurs. Once a year, oranges of this variety are collected from trees in Seville and shipped to Britain to be used in marmalade. However, the fruit is rarely consumed locally in Andalusia.
*Chinotto, from the myrtle-leaved orange tree, C. aurantium var. myrtifolia, is used for the namesake Italian soda beverage. This is sometimes considered a separate species.
Daidai, C. aurantium var. daidai, is used in Chinese medicine and Japanese New Year celebrations. The aromatic flowers are added to tea.
*Wild Florida sour orange is found near small streams in generally secluded and wooded parts of Florida and the Bahamas. It was introduced to the area from Spain.
Prefers a moderately heavy loam with a generous amount of compost and sand added and a very sunny position. Prefers a pH between 5 and 6. Tolerates a pH in the range 4.8 to 8.3. Plants are intolerant of water logging. When growing plants in pots, a compost comprising equal quantities of loam and leafmould plus a little charcoal should produce good results. Do not use manure since Citrus species dislike it. When watering pot plants it is important to neither overwater or underwater since the plant will soon complain by turning yellow and dying. Water only when the compost is almost dry, but do not allow it to become completely dry. Dormant plants can withstand temperatures down to about -6°c so long as this is preceded by cool weather in order to harden off the plant. The young growth in spring, even on mature plants, is frost-tender and so it is best to grow the plants in a position sheltered from the early morning sun. A tree grown outdoors on the coast at Salcombe in Devon lived for over 200 years. The bitter orange is often grown for its edible fruit in warm temperate and tropical zones, there are many named varieties. In Britain it can be grown in a pot that is placed outdoors in the summer and brought into a greenhouse during the winter. Plants dislike root disturbance and so should be placed into their permanent positions when young. If growing them in pots, great care must be exercised when potting them on into larger containers.
The seed is best sown in a greenhouse as soon as it ripe after thoroughly rinsing it. Sow stored seed in March in a greenhouse. Germination usually takes place within 2 – 3 weeks at 13°c. Seedlings are liable to damp off so they must be watered with care and kept well ventilated. The seed is usually polyembrionic, two or more seedlings arise from each seed and they are genetically identical to the parent but they do not usually carry any virus that might be present in the parent plant. When large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for at least three growing seasons before trying them outdoors. Plant them out in the summer and give them some protection from the cold for their first few winters outdoors. Cuttings of half-ripe wood, July/August in a frame. Layering in October.
Edible Parts: Fruit.
Edible Uses: Condiment; Oil.
Fruit – raw or cooked. Very bitter. It is used in making marmalade and other preserves. The fruit is about 5 – 7cm in diameter. The rind of the fruit is often used as a flavouring in cakes etc. Used in ‘bouquet garni’. An oil obtained from the seeds contains linolenic acid and is becoming more widely used as a food because of its ability to reduce levels of cholesterol in the blood. The flowers are used for scenting tea. An essential oil from the dried peel of immature fruits is used as a food flavouring
The unripe fruit, called narthangai, is commonly used in Southern Indian cuisine, especially in Tamil cuisine. It is pickled by cutting it into spirals and stuffing it with salt. The pickle is usually consumed with yoghurt rice thayir sadam. The fresh fruit is also used frequently in pachadis. The juice from the ripe fruit is also used as a marinade for meat in Nicaraguan, Cuban, Dominican and Haitian cooking, as it was in Peruvian Ceviche until the 1960s. The peel can be used in the production of bitters. In Yucatan (Mexico), it is a main ingredient of the cochinita pibil.
The Belgian Witbier (white beer) is made from wheat spiced with the peel of the bitter orange. The Finnish and Swedish use bitter orange peel in gingerbread (pepparkakor), some Christmas bread and in mämmi. It is also used in the Nordic mulled wine glögg. In Greece and Cyprus, the nerántzi or kitrómilon, respectively, is one of the most prized fruits used for spoon sweets, and the C. aurantium tree (nerantziá or kitromiliá) is a popular ornamental tree. Throughout Iran, the juice is popularly used as a salad dressing, souring agent in stews and pickles or as a marinade. The blossoms are collected fresh to make a prized sweet-smelling aromatic jam (“Bitter orange blossom jam” Morabba Bahar-Narendj), or added to brewing tea. In Turkey, juice of the ripe fruits can be used as salad dressing, especially in Çukurova region.
Antibacterial; Antiemetic; Antifungal; Antispasmodic; Antitussive; Aromatherapy; Carminative; Contraceptive; Diaphoretic; Digestive; Miscellany; Sedative; Stimulant; Stomachic; Tonic.
Citrus species contain a wide range of active ingredients and research is still underway in finding uses for them. They are rich in vitamin C, flavonoids, acids and volatile oils. They also contain coumarins such as bergapten which sensitizes the skin to sunlight. Bergapten is sometimes added to tanning preparations since it promotes pigmentation in the skin, though it can cause dermatitis or allergic responses in some people. Some of the plants more recent applications are as sources of anti-oxidants and chemical exfoliants in specialized cosmetics. The plants also contain umbelliferone, which is antifungal, as well as essential oils that are antifungal and antibacterial. They also contain the pyrone citrantin, which shows antifertility activity and was once used as a component of contraceptives. Both the leaves and the flowers are antispasmodic, digestive and sedative. An infusion is used in the treatment of stomach problems, sluggish digestion etc. The fruit is antiemetic, antitussive, carminative, diaphoretic, digestive and expectorant.The immature fruit can be used (called Zhi Shi in China) or the mature fruit with seeds and endocarp removed (called Zhi Ke). The immature fruit has a stronger action. They are used in the treatment of dyspepsia, constipation, abdominal distension, stuffy sensation in the chest, prolapse of the uterus, rectum and stomach. The fruit peel is bitter, digestive and stomachic. The seed and the pericarp are used in the treatment of anorexia, chest pains, colds, coughs etc. The essential oil is used in aromatherapy. Its keyword is ‘Radiance’. It is used in treating depression, tension and skin problems.
The leaves have a high vitamin C content in the form of ascorbic acid, and the fruit is full of this too. The fruit also contains flavonoid-glycosides such as aldehytes, ketone-free acids, esters, coumarins and tetranotriterpenoids (limonin). Synephrine is the main chemical constituent in the fruit flavones naringin and neohesperidin. The fruit contains vitamin A and some B-complex vitamins, with the minerals calcium, iron and phosphorous; amino acids are also present.
The extract of bitter orange (and bitter orange peel) has been marketed as dietary supplement purported to act as a weight-loss aid and appetite suppressant. Bitter orange contains the tyramine metabolites N-methyltyramine, octopamine and synephrine, substances similar to epinephrine, which act on the ?1 adrenergic receptor to constrict blood vessels and increase blood pressure and heart rate.p-Synephrine alone or in combination with caffeine or other substances has been shown to modestly increase weight loss in several low-quality clinical trials. Following bans on the herbal stimulant ephedra in the U.S., Canada, and elsewhere, bitter orange has been substituted into “ephedra-free” herbal weight-loss products by dietary supplement manufacturers. Like most dietary supplement ingredients, bitter orange has not undergone formal safety testing, but it is believed to cause the same spectrum of adverse events as ephedra. Case reports have linked bitter orange supplements to strokes, angina, and ischemic colitis. The U.S. National Center for Complementary and Alternative Medicine found that “there is currently little evidence that bitter orange is safer to use than ephedra.” Bitter orange may have serious drug interactions with drugs such as statins in a similar way to grapefruit.
Because of the potential for additive effects, synephrine use is best avoided in patients with hypertension, tachyarrhythmia, or narrow angle glaucoma.
Avoid use due to lack of clinical data regarding safety and efficacy during pregnancy and lactation.
Bitter Orange Interactions
Bitter orange may inhibit intestinal CYP3A4 and intestinal efflux and may interact with numerous drugs, including anxiolytics, antidepressants, antiviral agents, calcium channel blockers, dextromethorphan, GI prokinetic agents, vasoconstrictors, and weight-loss formulas.
Essential; Hedge; Oil; Repellent; Rootstock.
This species is much used as a rootstock for the sweet orange, C. sinensis, because of its disease resistance and greater hardiness. Grown as a hedging plant in N. America. A semi-drying oil obtained from the seed is used in soap making. Essential oils obtained from the peel, petals and leaves are used as a food flavouring and also in perfumery and medicines. The oil from the flowers is called ‘Neroli oil’ – yields are very low from this species and so it is often adulterated with inferior oils. The oil from the leaves and young shoots is called ‘petit-grain’ – 400 kilos of plant material yield about 1 kilo of oil. This is also often adulterated with inferior products. Neroli oil, mixed with vaseline, is used in India as a preventative against leeches
Medical literature primarily documents cardiovascular toxicity, especially due to the stimulant amines synephrine, octopamine, and N-methyltyramine, which may cause vasoconstriction as well as increased heart rate and blood pressure.
Known Hazards: (Bitter Orange Adverse Reactions)
There are numerous case reports of adverse cardiac reactions associated with C. aurantium extract use.
Following an incident in which a healthy young man suffered a myocardial infarction (heart attack) linked to bitter orange, a case study found that dietary supplement manufacturers had replaced ephedra with its analogs from bitter orange
The information presented herein is intended for educational purposes only. Individual results may vary, and before using any supplements, it is always advisable to consult with your own health care provider.