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Canola oil

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For the inventor of the harp in Celtic mythology, see Canola (mythology).

Template:Globalize/North America Canola refers to both an edible oil (also known as Canola oil) produced from the seed of any of several varieties of the rape plant, and to those plants, namely a cultivar of either rapeseed (Brassica napus L.) or field mustard/turnip rape (Brassica rapa subsp. oleifera, syn. Brassica campestris L.). Consumption of the oil is not believed to cause harm in humans[1][dead link][2] and livestock.[3] It is also used as a source of biodiesel.

Canola was bred naturally from rapeseed at the University of Manitoba, Canada, by Keith Downey and Baldur R. Stefansson in the early 1970s and had a different nutritional profile, in addition to much less erucic acid. In the international community, Canola is generally referred to as Rapeseed 00 or Double Zero Rapeseed to denote both low glucosinolates and low erucic acid. In addition to varieties from the traditional Rapa dn Napus species, recent cross-breeding of multiples lines of Brassica juncea have enable this mustard variety to be classified as a canola variety by lowering both erucic acid and glucosinolates to the market standards, achieving LEAR status (for low erucic acid rapeseed). It may also be referred to as canola oil and is considered safe for human consumption.[4]

Etymology

The name "canola" was chosen by the board of the Rapeseed Association of Canada in the 1970s. The "Can" part stands for Canada and "ola" refers to oil,[5][6] like the "ola" Mazola™ corn oil. However, a number of sources, including dictionaries, continue to claim that it stands for "Can(ada)+o(il)+l(ow)+a(cid). These dictionaries include the The American Heritage Dictionary of the English Language and Random House Kernerman Webster's College Dictionary.[7]

History

Close up of rapeseed blooms
Canola flower
Canola field in Temora, New South Wales

Canola was developed through conventional plant breeding from rapeseed, an oilseed plant already used in ancient civilization as a fuel. The word "rape" in rapeseed comes from the Latin word rapum meaning turnip. Turnip, rutabaga, cabbage, Brussels sprouts, mustard, and many other vegetables are related to the two natural canola varieties commonly grown, which are cultivars of Brassica napus and Brassica rapa. The change in name serves to distinguish it from natural rapeseed oil, which has much higher erucic acid content.

Brassica oilseed varieties are some of the oldest plants cultivated by humanity, with documentation of its use in India 4,000 years ago, and use in China and Japan 2,000 years ago.[8]: 55  Its use in Northern Europe for oil lamps is documented to the 13th century.[8] Its use was limited until the development of steam power, when machinists found rapeseed oil clung to water—and steam-washed metal surfaces—better than other lubricants. World War II saw high demand for the oil as a lubricant for the rapidly increasing number of steam engines in naval and merchant ships. When the war blocked European and Asian sources of rapeseed oil, a critical shortage developed, and Canada began to expand its limited rapeseed production.

After the war, demand declined sharply, and farmers began to look for other uses for the plant and its products. Rapeseed oil extracts were first put on the market in 1956–1957 as food products, but these suffered from several unacceptable characteristics. Rapeseed oil had a distinctive taste and a disagreeable greenish color, due to the presence of chlorophyll. It also contained a high concentration of erucic acid. Experiments on animals have pointed to the possibility that erucic acid, consumed in large quantities, may cause heart damage, although Indian researchers have published findings that call into question these conclusions and the implication that the consumption of mustard or rapeseed oil is dangerous.[9][10][11][12][13] Feed meal from the rapeseed plant also was not particularly appealing to livestock, because of high levels of sharp-tasting compounds called glucosinolates.

Canola was bred from rapeseed at the University of Manitoba, Canada by Keith Downey and Baldur R. Stefansson in the early 1970s,[14][15] and had a very different nutritional profile in addition to much less erucic acid.[16]

A variety developed in 1998 is considered to be the most disease and drought resistant Canola variety of rapeseed to date. This and other recent varieties have been produced by using genetic engineering. In 2011, 26% of the acres sown were genetically modified (biotech) canola.[17]

Canola was originally a trademark, but is now a generic term for edible varieties of rapeseed oil in North America and Australia. In Canada, an official definition of canola is codified in Canadian law.[18]

Production and trade

Rapeseed was once considered a specialty crop in Canada, but canola now has become a major American cash crop. Canada and the United States produce between 7 and 10 million tonnes of canola seed per year. Annual Canadian exports total 3 to 4 million tonnes of the seed, 800,000 tonnes of canola oil, and 1 million tonnes of canola meal. GM canola may not be grown in jurisdictions that have not approved GMOs. Within the United States, 90% of the canola crop is grown in North Dakota.[19]

Rapeseed is the highest-producing oil seed crop in the USA. An Oregon State University researcher has determined that winter growing of hybrid canola seed appears possible in central Oregon, USA; however, the state prohibits it from being grown in Deschutes, Jefferson, and Crook counties, because it may attract bees from specialty seed crops, such as carrots, which require bees for pollination. The rapeseed blossom is a major source of nectar for honeybees.

The major customers of canola seed are Japan, Mexico, China, and Pakistan, while the bulk of canola oil and meal goes to the United States, with smaller amounts shipped to Mexico, China, and Europe. World production of rapeseed oil in the 2002–2003 season was about 14 million metric tons.[20] In the 2010–2011 season, world production is estimated to be at 58.4 million tonnes.[21] The United States is a net consumer of canola oil, having used 3 billion pounds in 2010, 2.5 billion of which was imported from Canada.[19]

The main price discovery mechanism for worldwide canola trade is the ICE Futures Canada (formerly Winnipeg Commodity Exchange) canola futures contract. Rapeseed is traded on the Euronext exchange.

Canola oil

Bottle of canola cooking oil

Canola oil is made at a processing facility by slightly heating and then crushing the seed. Almost all commercial grade canola oil is then refined using hexane. Finally, the crude oil is refined using water precipitation and organic acid, "bleaching" with clay, and deodorizing using steam distillation.[22] Approximately 43% of a seed is oil.[23] What remains is a rapeseed meal that is used as high quality animal feed. 22.68 kg (50 lb) of rapeseed makes approximately 10 L (2.64 US gal) of canola oil. Canola oil is a key ingredient in many foods. Its reputation as a healthy oil has created high demand in markets around the world, and overall it is the third most widely consumed vegetable oil in the world.[24]

The oil has many non-food uses and often replaces non-renewable resources in products, including industrial lubricants, biofuels, candles, lipsticks, and newspaper inks. Canola oil is also recommended by the American Society for Reproductive Medicine for use as a fertility-preserving vaginal lubrication.[25]

The average density of canola oil is 0.92 g/ml.[26]

Health information

Compound Family % of total
Oleic acid
ω-9
61%[27]
Linoleic acid
ω-6
21%[27]
Alpha-linolenic acid
ω-3
11%[27] 9%[28][29]
Saturated fatty acids
7%[27]
Palmitic acid
4%[28]
Stearic acid
2%[28]
Trans fat
0.4%[30]

Canola oil is low in saturated fat and contains both omega-6 and omega-3 fatty acids in a ratio of 2:1. If consumed, it also reduces low-density lipoprotein and overall cholesterol levels, and as a significant source of the essential omega-3 fatty acid is associated with reduced all-cause and cardiovascular mortality.[31] It is recognized by many health professional organizations including the Academy of Nutrition and Dietetics and American Heart Association.[clarification needed][32][33][34][35] Canola oil has been given a qualified health claim from the United States Food and Drug Administration due to its high levels of cholesterol-lowering fats.[36]

Erucic acid issues

Main article: Erucic acid

Although wild rapeseed oil contains significant amounts of erucic acid,[37] a known toxin,[38] the cultivar used to produce commercial, food-grade canola oil was bred to contain less than 2% erucic acid, levels that are not believed to cause harm in humans,[39][40] and no health effects have been associated with consumption by humans of the genetically modified oil.[38] Although rumors that canola oil can cause dangerous health problems circulated,[41][42] there is no reason to believe canola oil poses unusual health risks, and its consumption in food-grade forms is generally recognized as safe by the United States Food and Drug Administration.[2][39]

The Chinese and Indians have used rapeseed oils for thousands of years, but the form used was unrefined (natural), which may make a difference in effect on health.[43]

Biodiesel

Main article: Biodiesel

Because of the lower levels of the toxic and irritating properties of genetically modified rapeseed oil, Canola oil is a more promising source for manufacturing biodiesel than the natural oil as a renewable alternative to fossil fuels.[citation needed]

Comparison to other vegetable oils

Properties of vegetable oils[44][45]
The nutritional values are expressed as percent (%) by mass of total fat.
Type Processing
treatment[46]		 Saturated
fatty acids		 Monounsaturated
fatty acids		 Polyunsaturated
fatty acids		 Smoke point
Total[44] Oleic
acid
(ω−9)		 Total[44] α-Linolenic
acid
(ω−3)		 Linoleic
acid
(ω−6)		 ω−6:3
ratio
Avocado[47] 11.6 70.6 52–66
[48]		 13.5 1 12.5 12.5:1 250 °C (482 °F)[49]
Brazil nut[50] 24.8 32.7 31.3 42.0 0.1 41.9 419:1 208 °C (406 °F)[51]
Canola[52] 7.4 63.3 61.8 28.1 9.1 18.6 2:1 204 °C (400 °F)[53]
Coconut[54] 82.5 6.3 6 1.7 0.019 1.68 88:1 175 °C (347 °F)[51]
Corn[55] 12.9 27.6 27.3 54.7 1 58 58:1 232 °C (450 °F)[53]
Cottonseed[56] 25.9 17.8 19 51.9 1 54 54:1 216 °C (420 °F)[53]
Cottonseed[57] hydrogenated 93.6 1.5 0.6 0.2 0.3 1.5:1
Flaxseed/linseed[58] 9.0 18.4 18 67.8 53 13 0.2:1 107 °C (225 °F)
Grape seed   10.4 14.8 14.3   74.9 0.15 74.7 very high 216 °C (421 °F)[59]
Hemp seed[60] 7.0 9.0 9.0 82.0 22.0 54.0 2.5:1 166 °C (330 °F)[61]
High-oleic safflower oil[62] 7.5 75.2 75.2 12.8 0 12.8 very high 212 °C (414 °F)[51]
Olive (extra virgin)[63] 13.8 73.0 71.3 10.5 0.7 9.8 14:1 193 °C (380 °F)[51]
Palm[64] 49.3 37.0 40 9.3 0.2 9.1 45.5:1 235 °C (455 °F)
Palm[65] hydrogenated 88.2 5.7 0
Peanut[66] 16.2 57.1 55.4 19.9 0.318 19.6 61.6:1 232 °C (450 °F)[53]
Rice bran oil 25 38.4 38.4 36.6 2.2 34.4[67] 15.6:1 232 °C (450 °F)[68]
Sesame[69] 14.2 39.7 39.3 41.7 0.3 41.3 138:1
Soybean[70] 15.6 22.8 22.6 57.7 7 51 7.3:1 238 °C (460 °F)[53]
Soybean[71] partially hydrogenated 14.9 43.0 42.5 37.6 2.6 34.9 13.4:1
Sunflower[72] 8.99 63.4 62.9 20.7 0.16 20.5 128:1 227 °C (440 °F)[53]
Walnut oil[73] unrefined 9.1 22.8 22.2 63.3 10.4 52.9 5:1 160 °C (320 °F)[74]

Genetic modification issues

Blooming Canola field in Saskatchewan

A genetically engineered rapeseed that is tolerant to herbicide was first introduced to Canada in 1995 (see Roundup Ready Canola). In 2009, 90% of the Canadian crop was herbicide-tolerant.[75] As of 2005, 87% of the canola grown in the US was genetically modified.[76] A 2010 study conducted in North Dakota found glyphosate- or glufosinate-resistance transgenes in 80% of wild natural rapeseed plants, and a few plants that were resistant to both herbicides. The escape of the genetically modified plants has raised concerns that the build-up of herbicide resistance in feral canola could make it more difficult to manage these plants using herbicides. However one of the researchers agrees that ".. feral populations could have become established after trucks carrying cultivated GM seeds spilled some of their load during transportation." She also notes that the GM canola results they found may have been biased as they only sampled along roadsides.[77]

Genetically modified canola has become a point of controversy and contentious legal battles. In one high-profile case (Monsanto Canada Inc. v. Schmeiser) the Monsanto Company sued Percy Schmeiser for patent infringement after he replanted canola seed that he had harvested from his field, which he discovered was contaminated with Monsanto's patented glyphosate-tolerant canola by spraying it with glyphosate, leaving only the resistant plants. The Supreme Court ruled that Percy was in violation of Monsanto's patent because he knowingly replanted the resistant seed that he had harvested, but he was not required to pay Monsanto damages since he did not benefit financially from its presence.[78] On 19 March 2008, Schmeiser and Monsanto Canada Inc. came to an out-of-court settlement whereby Monsanto would pay for the clean-up costs of the contamination, which came to a total of C$660.[79]

In 2003, Australia's gene technology regulator approved the release of canola altered to make it resistant to Glufosinate ammonium, a herbicide.[80] The introduction of the genetically modified crop to Australia generated considerable controversy.[81] Canola is Australia's third biggest crop, and is used often by wheat farmers as a break crop to improve soil quality. As of 2008 the only genetically modified crops in Australia were canola, cotton, and carnations.[82][83]

See also

References

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  82. ^ GM Crops and Stockfeed
  83. ^ GM Carnations in Australia
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