Bakeriella dulcifica (Schumach. & Thonn.) Dubard
Synsepalum dulcificum is a plant in the Sapotaceae family known for its berry that, when eaten, causes sour foods (such as lemons and limes) subsequently consumed to taste sweet. This effect is due to miraculin. Common names for this species and its berry include miracle fruit, miracle berry, miraculous berry, sweet berry, and in West Africa, where the species originates, agbayun, taami, asaa, and ledidi.
The berry itself has a low sugar content and a mildly sweet tang. It contains a glycoprotein molecule, with some trailing carbohydrate chains, called miraculin. When the fleshy part of the fruit is eaten, this molecule binds to the tongue's taste buds, causing sour foods to taste sweet. At neutral pH, miraculin binds and blocks the receptors, but at low pH (resulting from ingestion of sour foods) miraculin binds proteins and becomes able to activate the sweet receptors, resulting in the perception of sweet taste. This effect lasts until the protein is washed away by saliva (up to about 30 minutes).
The examples and perspective in this section deal primarily with the United States and do not represent a worldwide view of the subject. (August 2012)
The berry has been used in West Africa since at least the 18th century, when a European explorer, the Chevalier des Marchais, provided an account of its use there. Des Marchais, who was searching West Africa for many different fruits in a 1725 excursion, noticed that local people picked the berry from shrubs and chewed it before meals.
In the 1980s in the United States, an attempt was made to commercialize the fruit for its ability to mask non-sweet foods as sweet without a caloric cost, but became compromised when the Food and Drug Administration classified the berry as a food additive and required evidence of safety. For a time in the 1970s, US dieters could purchase a pill form of miraculin. This interest had a revival in food-tasting events at which tasters consume sour and bitter foods, such as lemons, radishes, pickles, hot sauce, and beer, then experience the perceived change to sweetness with miraculin.
It is a shrub that grows 1.8–4.5 m (5.9–14.8 ft) in height and has dense foliage. Its leaves are 5–10 cm (2.0–3.9 in) long, 2.0–3.7 cm (0.79–1.46 in) wide, and glabrous below. They are clustered at the ends of the branchlets. The flowers are white. It carries red, 2 cm (0.79 in) long fruits. Each fruit contains one seed.
The seeds need 14 to 21 days to germinate. A spacing of 4 m (13 ft) between plants is suggested.
The plants first bear fruit after growing about 3–4 years, and produce two crops per year, after the end of the rainy season. This evergreen plant produces small, red berries, while white flowers are produced for many months of the year.
The seeds are about the size of coffee beans.
Uses and regulation
In tropical West Africa, where this species originates, the fruit pulp is used to sweeten palm wine. Historically, it was also used to improve the flavor of soured cornbread, but has been used as a sweetener and flavoring agent for diverse beverages and foods, such as beer, cocktails, vinegar, and pickles.
The berry is on the EU list of novel foods, and requires a safety assessment before it can be sold as food or used as a food additive. Since 2011, the United States FDA has imposed a ban on importing Synsepalum dulcificum (specifying 'miraculin') from its origin in Taiwan, declaring it as an "illegal undeclared sweetener".
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The berries contain miraculin, a rogue glycoprotein that tricks the tongue's taste-bud receptors into believing a sour food is actually sweet. People in parts of west Africa have been using the berries to sweeten sour food and drink for centuries, but it is only recently that the global food industry has cottoned on.
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- Sun, Hyeon-Jin; Hiroshi Kataoka; Megumu Yano; Hiroshi Ezura (2007). "Genetically stable expression of functional miraculin, a new type of alternative sweetener, in transgenic tomato plants". Plant Biotechnology Journal. 5 (6): 768–777. doi:10.1111/j.1467-7652.2007.00283.x. ISSN 1467-7644. PMID 17692073.
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- "Synsepalum dulcificum Import Alert 45-07; Taiwan". US Food and Drug Administration. 5 February 2018. Retrieved 9 February 2018.
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