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A banana peel, known as a banana skin in British English, is the outer covering of the banana fruit. Bananas are a popular fruit consumed worldwide with a yearly production of over 145 million tonnes in 2011. Once the peel is removed, the fruit can be eaten raw or cooked and the peel is generally discarded. Because of this removal of the banana peel, a significant amount of organic waste is generated.〔〔 Banana peels are used as feedstock as they have some nutritional value. Banana peels are widely used for that purpose on small farms in regions where bananas are grown. There are some concerns over the impact of tannins contained in the peels on animals that consume them.〔〔 Banana peels are used as feedstock for cattle, goats, pigs, poultry, rabbits, fish and several other species.〔 The specific nutrition contained in peel depends on the stage of maturity and the cultivar; for example plantain peels contain less fibre than dessert banana peels, and lignin content increases with ripening (from 7 to 15% dry matter). On average, banana peels contain 6-9% dry matter of protein and 20-30% fibre (measured as NDF). Green plantain peels contain 40% starch that is transformed into sugars after ripening. Green banana peels contain much less starch (about 15%) when green while ripe banana peels contain up to 30% free sugars.〔 Banana peels are also used for water purification,〔 to produce ethanol,〔 cellulase,〔 laccase,〔 as fertilizer〔 and in composting.〔 Banana peel is also part of the classic physical comedy slapstick visual gag, the "slipping on a banana peel".〔〔 This gag was already seen as classic in 1920s America.〔 It can be traced to the late 19th century, when banana peel waste was considered a public hazard in a number of American towns.〔〔 Although banana peel-slipping jokes date to at least 1854, they became much more popular, beginning in the late-1860s, when the large-scale importation of bananas made them more readily available. Before banana peel jokes came into vogue, orange peels, and sometimes peach skins, or fruit peels/peelings/or skins, generally, were funny, as well as dangerous.〔 The coefficient of friction of banana peel on a linoleum surface was measured at just 0.07, about half that of lubricated metal on metal. Researchers attribute this to the crushing of the natural polysaccharide follicular gel, releasing a homogenous sol. This unsurprising finding was awarded the 2014 Ig Nobel Prize for physics. ==See also== * Bananadine, a fictional psychoactive substance of banana peels 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Banana peel」の詳細全文を読む スポンサード リンク
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