Vegetable oils, or vegetable fats, are oils extracted from seeds or from other parts of fruits. Like animal fats, vegetable fats are mixtures of triglycerides. Soybean oil, grape seed oil, and cocoa butter are examples of fats from seeds. Olive oil, palm oil, and rice bran oil are examples of fats from other parts of fruits. In common usage, vegetable oil may refer exclusively to vegetable fats which are liquid at room temperature. Vegetable oils are usually edible; non-edible oils derived mainly from petroleum are termed mineral oils. Vegetable oil sold in the U.S. is normally synonymous with soybean oil.
Uses of triglyceride vegetable oil
Uses in antiquity
Oils extracted from plants have been used since ancient times and in many cultures. As an example, in a 4,000-year-old kitchen unearthed in Indiana's Charlestown State Park, archaeologist Bob McCullough of Indiana University-Purdue University Fort Wayne found evidence that large slabs of rock were used to crush hickory nuts and the oil was then extracted with boiling water. Archaeological evidence shows that olives were turned into olive oil by 6000 BCE and 4500 BCE in present-day Israel and Palestine.
In addition to use as food, fats and oils (both vegetable and mineral) have long been used as fuel, typically in lamps which were a principal source of illumination in ancient times. Oils may have been used for lubrication, but there is no evidence for this. Vegetable oils were probably more valuable as food and lamp-oil; Babylonian mineral oil was known to be used as fuel, but there are no references to lubrication. Pliny the Elder reported that fats such as lard were used to lubricate the axles of carts.
Many vegetable oils are consumed directly, or indirectly as ingredients in food – a role that they share with some animal fats, including butter, ghee, lard, and schmaltz. The oils serve a number of purposes in this role:
- Shortening – to give pastry a crumbly texture.
- Texture – oils can serve to make other ingredients stick together less.
- Flavor – while less flavorful oils command premium prices, some oils, such as olive, sesame, or almond oil, may be chosen specifically for the flavor they impart.
- Flavor base – oils can also "carry" flavors of other ingredients, since many flavors are due to chemicals that are soluble in oil.
Oils can be heated to temperatures significantly higher than the boiling point of water, 100 °C (212 °F), and used to cook foods (frying). Oils for this purpose must have a high flash point. Such oils include the major cooking oils – soybean, rapeseed, canola, sunflower, safflower, peanut, cottonseed, etc. Tropical oils, such as coconut, palm, and rice bran oils, are particularly valued in Asian cultures for high-temperature cooking, because of their unusually high flash points.
Unsaturated vegetable oils can be transformed through partial or complete "hydrogenation" into oils of higher melting point. The hydrogenation process involves "sparging" the oil at high temperature and pressure with hydrogen in the presence of a catalyst, typically a powdered nickel compound, such as Raney nickel. Chemically, hydrogenation is the reduction of a carbon-carbon double bond to a single bond, by addition of hydrogen atoms. Since the surface of the metal catalyst is covered with hydrogen atoms, when the double bonds of the unsaturated oil come into contact with the catalyst, it reacts with the hydrogen atoms, forming new bonds with the two carbon atoms; each carbon atom becomes single-bonded to an individual hydrogen atom, and the double bond between carbons can no longer exist. In organic chemistry, unsaturation is considered as a pair of hydrogen atoms missing from the (hypothetical) fully-saturated carbon chain. The level to which an organic molecule is deficient in hydrogen, is called the degree of unsaturation (DoU); as the degree of unsaturation decreases, the oil progresses toward being fully hydrogenated (when DoU = 0). A fully hydrogenated oil, also called a saturated fat, has had all of its double bonds converted into single bonds. If a polyunsaturated oil is left incompletely-hydrogenated (not all of the double bonds are reduced to single bonds), then it is a "partially hydrogenated oil" (PHO). PHOs are the primary dietary source of artificial trans fat in processed foods. An oil may be hydrogenated to increase resistance to rancidity (oxidation) or to change its physical characteristics. As the degree of unsaturation is lowered by full or partial hydrogenation, the oil's viscosity and melting point increase.
The use of hydrogenated oils in foods has never been completely satisfactory. Because the center arm of the triglyceride is shielded somewhat by the end fatty acids, most of the hydrogenation occurs on the end fatty acids, thus making the resulting fat more brittle. A margarine made from naturally more saturated oils will be more plastic (more "spreadable") than a margarine made from hydrogenated soy oil. While full hydrogenation produces largely saturated fatty acids, partial hydrogenation results in the transformation of unsaturated cis fatty acids to unsaturated trans fatty acids in the oil mixture due to the heat used in hydrogenation. Partially hydrogenated oils and their trans fats have been linked to an increased risk of mortality from coronary heart disease, among other increased health risks.
In the US, the Standard of Identity for a product labeled as "vegetable oil margarine" specifies only canola, safflower, sunflower, corn, soybean, or peanut oil may be used. Products not labeled "vegetable oil margarine" do not have that restriction.
Vegetable oils are used as an ingredient or component in many manufactured products.
Many vegetable oils are used to make soaps, skin products, candles, perfumes and other personal care and cosmetic products. Some oils are particularly suitable as drying oils, and are used in making paints and other wood treatment products. They are used in alkyd resin production. Dammar oil (a mixture of linseed oil and dammar resin), for example, is used almost exclusively in treating the hulls of wooden boats. Vegetable oils are increasingly being used in the electrical industry as insulators as vegetable oils are not toxic to the environment, biodegradable if spilled and have high flash and fire points. However, vegetable oils are less stable chemically, so they are generally used in systems where they are not exposed to oxygen, and they are more expensive than crude oil distillate. Synthetic tetraesters, which are similar to vegetable oils but with four fatty acid chains compared to the normal three found in a natural ester, are manufactured by Fischer esterification. Tetraesters generally have high stability to oxidation and have found use as engine lubricants. Vegetable oil is being used to produce biodegradable hydraulic fluid and lubricant.
One limiting factor in industrial uses of vegetable oils is that all such oils are susceptible to becoming rancid. Oils that are more stable, such as ben oil or mineral oil, are thus preferred for industrial uses. Castor oil has numerous industrial uses, owing to the presence of hydroxyl group on the fatty acid. Castor oil is a precursor to Nylon 11.Castor oil may also be reacted with epichlorohydrin to make a glycidyl ether which is used as a diluent and flexibilizer with epoxy resins.
Pet food additive
Vegetable oil is used in the production of some pet foods. AAFCO defines vegetable oil, in this context, as the product of vegetable origin obtained by extracting the oil from seeds or fruits which are processed for edible purposes.
Vegetable oils are also used to make biodiesel, which can be used like conventional diesel. Some vegetable oil blends are used in unmodified vehicles but straight vegetable oil, also known as pure plant oil, needs specially prepared vehicles which have a method of heating the oil to reduce its viscosity. The use of vegetable oils as alternative energy is growing and the availability of biodiesel around the world is increasing.
The production process of vegetable oil involves the removal of oil from plant components, typically seeds. This can be done via mechanical extraction using an oil mill or chemical extraction using a solvent. The extracted oil can then be purified and, if required, refined or chemically altered.
Oils can be removed via mechanical extraction, termed "crushing" or "pressing." This method is typically used to produce the more traditional oils (e.g., olive, coconut etc.), and it is preferred by most "health-food" customers in the United States and in Europe. There are several different types of mechanical extraction. Expeller-pressing extraction is common, though the screw press, ram press, and ghani (powered mortar and pestle) are also used. Oilseed presses are commonly used in developing countries, among people for whom other extraction methods would be prohibitively expensive; the ghani is primarily used in India. The amount of oil extracted using these methods varies widely, as shown in the following table for extracting mowrah butter in India:
The processing of vegetable oil in commercial applications is commonly done by chemical extraction, using solvent extracts, which produces higher yields and is quicker and less expensive. The most common solvent is petroleum-derived hexane. This technique is used for most of the "newer" industrial oils such as soybean and corn oils. After extraction, the solvent is evaporated out by heating the mixture to about 300 °F (149 °C).
Oils may be partially hydrogenated to produce various ingredient oils. Lightly hydrogenated oils have very similar physical characteristics to regular soy oil, but are more resistant to becoming rancid. Margarine oils need to be mostly solid at 32 °C (90 °F) so that the margarine does not melt in warm rooms, yet it needs to be completely liquid at 37 °C (98 °F), so that it doesn't leave a "lardy" taste in the mouth.
Hardening vegetable oil is done by raising a blend of vegetable oil and a catalyst in near-vacuum to very high temperatures, and introducing hydrogen. This causes the carbon atoms of the oil to break double-bonds with other carbons, each carbon forming a new single-bond with a hydrogen atom. Adding these hydrogen atoms to the oil makes it more solid, raises the smoke point, and makes the oil more stable.
Hydrogenated vegetable oils differ in two major ways from other oils which are equally saturated. During hydrogenation, it is easier for hydrogen to come into contact with the fatty acids on the end of the triglyceride, and less easy for them to come into contact with the center fatty acid. This makes the resulting fat more brittle than a tropical oil; soy margarines are less "spreadable". The other difference is that trans fatty acids (often called trans fat) are formed in the hydrogenation reactor, and may amount to as much as 40 percent by weight of a partially hydrogenated oil. Hydrogenated oils, especially partially hydrogenated oils with their higher amounts of trans fatty acids, are increasingly thought to be unhealthy.
In the processing of edible oils, the oil is heated under vacuum to near the smoke point or to about 450 °F (232 °C), and water is introduced at the bottom of the oil. The water immediately is converted to steam, which bubbles through the oil, carrying with it any chemicals which are water-soluble. The steam sparging removes impurities that can impart unwanted flavors and odors to the oil. Deodorization is key to the manufacture of vegetable oils. Nearly all soybean, corn, and canola oils found on supermarket shelves go through a deodorization stage that removes trace amounts of odors and flavors, and lightens the color of the oil.
People can breathe in vegetable oil mist in the workplace. The U.S. Occupational Safety and Health Administration (OSHA) has set the legal limit (permissible exposure limit) for vegetable oil mist exposure in the workplace as 15 mg/m3 total exposure and 5 mg/m3 respiratory exposure over an 8-hour workday. The U.S. National Institute for Occupational Safety and Health (NIOSH) has set a recommended exposure limit (REL) of 10 mg/m3 total exposure and 5 mg/m3 respiratory exposure over an 8-hour workday.
Typical productivity of some oil crops, measured in tons (t) of oil produced per hectare (ha) of land per year (yr). Oil palm is by far the highest yielding crop, capable of producing about 4 tons of palm oil per hectare per year.
The following triglyceride vegetable oils account for almost all worldwide production, by volume. All are used as both cooking oils and as SVO or to make biodiesel. According to the USDA, the total world consumption of major vegetable oils in 2007/08 was:
|Oil source||World consumption
(million metric tons)
|Palm||41.31||The most widely produced tropical oil, also used to make biofuel|
|Soybean||41.28||One of the most widely consumed cooking oils|
|Rapeseed||18.24||One of the most widely used cooking oils, canola is a variety (cultivar) of rapeseed|
|Sunflower seed||9.91||A common cooking oil, also used to make biodiesel|
|Peanut||4.82||Mild-flavored cooking oil|
|Cottonseed||4.99||A major food oil, often used in industrial food processing|
|Palm kernel||4.85||From the seed of the African palm tree|
|Coconut||3.48||Used in cooking, cosmetics and soaps|
|Olive||2.84||Used in cooking, cosmetics, soaps and as a fuel for traditional oil lamps|
Note that these figures include industrial and animal feed use. The majority of European rapeseed oil production is used to produce biodiesel, or used directly as fuel in diesel cars which may require modification to heat the oil to reduce its higher viscosity. The suitability of the fuel should come as little surprise, as Rudolf Diesel's original engine to ran on peanut oil as well as mineral oil.
Other significant triglyceride oils include:
- Corn oil, one of the most common cooking oils. As of 2006, the US produced about 1.09 million metric tons of corn oil, which is used for cooking oil, salad dressing, margarine, mayonnaise, prepared goods like spaghetti sauce and baking mixes, and to fry prepared foods like potato chips and French fries.
- Grape seed oil, used in cooking and cosmetics
- Hazelnut oil and other nut oils
- Linseed oil, from flax seeds
- Rice bran oil, from rice grains
- Safflower oil, a flavorless and colorless cooking oil
- Sesame oil, used as a cooking oil, and as a massage oil, particularly in India
- Açaí palm oil, used in culinary and cosmetics
- Jambú oil, is extracted from the flowers, leaves and stem from jambu (Acmella oleracea), contains spilanthol
- Graviola oil, derived from Annona muricata
- Tucumã oil, from Astrocaryum aculeatum is used to manufacture soap.
- Brazil nut oil, culinary and cosmetics use
- Carapa oil, pharmaceutical use and anti-mosquito candle
- Buriti oil, from Mauritia flexuosa, used in cosmetics (skin and hair care)
- Passion fruit oil, derived from Passiflora edulis, has varied applications in cosmetics manufacturing and for uses as a human or animal food.
- Pracaxi oil, obtained from Pentaclethra macroloba, cosmetics use
- Solarium oil, derived from chloroplasts, various applications in cooking
Composition of fats
|Almond oil||216 °C (421 °F)|
|Avocado||11.6||70.6||52-66||13.5||1||12.5||12.5:1||250 °C (482 °F)|
|Brazil nut||24.8||32.7||31.3||42.0||0.1||41.9||419:1||208 °C (406 °F)|
|Canola||7.4||63.3||61.8||28.1||9.1||18.6||2:1||238 °C (460 °F)|
|Cocoa butter oil|
|Coconut||82.5||6.3||6||1.7||175 °C (347 °F)|
|Corn||12.9||27.6||27.3||54.7||1||58||58:1||232 °C (450 °F)|
|Cottonseed||25.9||17.8||19||51.9||1||54||54:1||216 °C (420 °F)|
|Flaxseed/Linseed||9.0||18.4||18||67.8||53||13||0.2:1||107 °C (225 °F)|
|Grape seed||10.5||14.3||14.3||74.7||-||74.7||very high||216 °C (421 °F)|
|Hemp seed||7.0||9.0||9.0||82.0||22.0||54.0||2.5:1||166 °C (330 °F)|
|Olive||13.8||73.0||71.3||10.5||0.7||9.8||14:1||193 °C (380 °F)|
|Palm||49.3||37.0||40||9.3||0.2||9.1||45.5:1||235 °C (455 °F)|
|Peanut||20.3||48.1||46.5||31.5||0||31.4||very high||232 °C (450 °F)|
|Rice bran oil||232 °C (450 °F)|
|Safflower||7.5||75.2||75.2||12.8||0||12.8||very high||212 °C (414 °F)|
|Soybean||15.6||22.8||22.6||57.7||7||51||7.3:1||238 °C (460 °F)|
|Walnut oil||unrefined||9.1||22.8||22.2||63.3||10.4||52.9||5:1||160 °C (320 °F)|
|Sunflower (standard)||10.3||19.5||19.5||65.7||0||65.7||very high||227 °C (440 °F)|
|Sunflower (< 60% linoleic)||10.1||45.4||45.3||40.1||0.2||39.8||199:1|
|Sunflower (> 70% oleic)||9.9||83.7||82.6||3.8||0.2||3.6||18:1||232 °C (450 °F)|
|The nutritional values are expressed as percent (%) by mass of total fat.|
Such oils have been part of human culture for millennia. Poppy seed, rapeseed, linseed, almond oil, sesame seed, safflower, and cottonseed were used since at least the Bronze Age throughout the Middle East, Africa and Central Asia. Vegetable oils have been used for lighting fuel, cooking, medicine and lubrication. The Chinese started to use vegetable oil for stir-frying instead of animal fats during the Song dynasty (960–1279). Palm oil has long been recognized in West and Central African countries, and European merchants trading with West Africa occasionally purchased palm oil for use as a cooking oil in Europe and it became highly sought-after commodity by British traders for use as an industrial lubricant for machinery during Britain's Industrial Revolution. Palm oil formed the basis of soap products, such as Lever Brothers' (now Unilever) "Sunlight" soap, and the American Palmolive brand., and by around 1870, palm oil constituted the primary export of some West African countries.
In 1780, Carl Wilhelm Scheele demonstrated that fats were derived from glycerol. Thirty years later Michel Eugène Chevreul deduced that these fats were esters of fatty acids and glycerol. Wilhelm Normann, a German chemist introduced the hydrogenation of liquid fats in 1901, creating what later became known as trans fats, leading to the development of the global production of margarine and vegetable shortening.
In the USA cottonseed oil was marketed by Procter & Gamble as a creamed shortening in 1911. Ginning mills were happy to have someone haul away the cotton seeds. The extracted oil was refined and partially hydrogenated to give a solid at room temperature and thus mimic natural lard, and canned under nitrogen gas. Compared to the rendered lard Procter & Gamble was already selling to consumers, Crisco was cheaper, easier to stir into a recipe, and could be stored at room temperature for two years without turning rancid.
Soybean oil has been used in China since before historical records. It arrived in the USA in the 1930s. Soy was protein-rich, and the medium viscosity oil was high in polyunsaturates. Henry Ford established a soybean research laboratory, developed soybean plastics and a soy-based synthetic wool, and built a car "almost entirely" out of soybeans. Roger Drackett had a successful new product with Windex, but he invested heavily in soybean research, seeing it as a smart investment. By the 1950s and 1960s, soybean oil had become the most popular vegetable oil in the US, now mying only behind Palm Oil. In 2018-2019, world production was at 57.4 MT with the leading producers including China (16.6 MT), US (10.9 MT), Argentina (8.4 MT), Brazil (8.2 MT), and EU (3.2 MT).
The early 20th century also saw the start of the use of vegetable oil as a fuel in diesel engines and in heating oil burners. Rudolf Diesel designed his engine to run on vegetable oil. The idea, he hoped, would make his engines more attractive to farmers having a source of fuel readily available. Diesel's first engine ran on its own power for the first time in Augsburg, Germany, on 10 August 1893 on nothing but peanut oil. In remembrance of this event, 10 August has been declared "International Biodiesel Day". The first patent on Biodiesel was granted in 1937. Periodic petroleum shortages spurred research into vegetable oil as a diesel substitute during the 1930s and 1940s, and again in the 1970s and early 1980s when straight vegetable oil enjoyed its highest level of scientific interest. The 1970s also saw the formation of the first commercial enterprise to allow consumers to run straight vegetable oil in their vehicles. However, Biodiesel, produced from oils or fats using transesterification is more widely used. It is Led by Brazil, many countries built Biodiesel plants during the 1990s, and it is now widely available for use in motor vehicles, and is the most common biofuel in Europe today. In France, biodiesel is incorporated at a rate of 8% in the fuel used by all French diesel vehicles.
In the mid-1970s, Canadian researchers developed a low-erucic-acid rapeseed cultivar. Because the word "rape" was not considered optimal for marketing, they coined the name "canola" (from "Canada Oil low acid"). The U.S. Food and Drug Administration approved use of the canola name in January 1985, and U.S. farmers started planting large areas that spring. Canola oil is lower in saturated fats, and higher in monounsaturates. Canola is very thin (unlike corn oil) and flavorless (unlike olive oil), so it largely succeeds by displacing soy oil, just as soy oil largely succeeded by displacing cottonseed oil.
A large quantity of used vegetable oil is produced and recycled, mainly from industrial deep fryers in potato processing plants, snack food factories and fast food restaurants.
Recycled oil has numerous uses, including use as a direct fuel, as well as in the production of biodiesel, soap, animal feed, pet food, detergent, and cosmetics. It is traded as the commodity, yellow grease.
Since 2002, an increasing number of European Union countries have prohibited the inclusion of recycled vegetable oil from catering in animal feed. Used cooking oils from food manufacturing, however, as well as fresh or unused cooking oil, continue to be used in animal feed.
Due to their susceptibility to oxidation from the exposure to oxygen, heat and light, resulting in the formation of oxidation products, such as peroxides and hydroperoxides, plant oils rich in polyunsaturated fatty acids have a limited shelf-life.
In Canada, palm oil is one of five vegetable oils, along with palm kernel oil, coconut oil, peanut oil, and cocoa butter, which must be specifically named in the list of ingredients for a food product. Also, oils in Canadian food products which have been modified or hydrogenated must contain the word "modified" or "hydrogenated" when listed as an ingredient. A mix of oils other than the aforementioned exceptions may simply be listed as "vegetable oil" in Canada; however, if the food product is a cooking oil, salad oil or table oil, the type of oil must be specified and listing "vegetable oil" as an ingredient is not acceptable.
From December 2014, all food products produced in the European Union were legally required to indicate the specific vegetable oil used in their manufacture, following the introduction of the Food Information to Consumers Regulation.
Notes and references
- Alfred Thomas (2002). "Fats and Fatty Oils". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a10_173. ISBN 3527306730.
- Parwez Saroj (September 2007). The Pearson Guide to the B.Sc. (Nursing) Entrance Examination. Pearson Education India. p. 109. ISBN 978-81-317-1338-9.
- Robin Dand (1999). The International Cocoa Trade. Woodhead Publishing. p. 169. ISBN 1-85573-434-6.
- "Wesson Vegetable Oil".
- "4,000-year-old 'kitchen' unearthed in Indiana". Archaeo News. January 26, 2006. Retrieved 2006-07-31.
- Ruth Schuster (December 17, 2014). "8,000-year old olive oil found in Galilee, earliest known in world", Haaretz. Retrieved December 17, 2014.
- Ehud Galili et al., "Evidence for Earliest Olive-Oil Production in Submerged Settlements off the Carmel Coast, Israel", Journal of Archaeological Science 24:1141–1150 (1997); Pagnol, p. 19, says the 6th millennium in Jericho, but cites no source.
- Harris, H. A. (2009). "Lubrication in Antiquity". Greece and Rome. 21 (1): 32–36. doi:10.1017/S0017383500021665. ISSN 0017-3835.
- "Final Determination Regarding Partially Hydrogenated Oils (Removing Trans Fat)". www.fda.gov. U.S. Food and Drug Administration. Retrieved 14 April 2021.
- Trans Fat Task Force (June 2006). "TRANSforming the Food Supply (Appendix 9iii)". Archived from the original on February 25, 2007. Retrieved 2007-01-09. Cite journal requires
|journal=(help) (Consultation on the health implications of alternatives to trans fatty acids: Summary of Responses from Experts)
- "Margarine". Code of Federal Regulations Title 21, Chapter I, Subchapter B, Part 166. US Food and Drug Administration. April 1, 2011. Retrieved 2011-11-01.
- Linda McGraw (April 19, 2000). "Biodegradable Hydraulic Fluid Nears Market". USDA. Retrieved 2006-09-29.
- "Cass Scenic Railroad, West Virginia". GWWCA. Retrieved 2011-11-01.
- "The Association of American Feed Control Officials (AAFCO)".
- National Non-Food Crops Centre. GHG Benefits from Use of Vegetable Oils for Electricity, Heat, Transport, and Industrial Purposes, NNFCC 10-016 Archived 2016-03-05 at the Wayback Machine
- Hossain, Amjad (2012). "Kalu". In Islam, Sirajul; Jamal, Ahmed A. (eds.). Banglapedia: National Encyclopedia of Bangladesh (Second ed.). Asiatic Society of Bangladesh.
- Janet Bachmann. "Oilseed Processing for Small-Scale Producers". Retrieved 2006-07-31.
- B.L. Axtell from research by R.M. Fairman (1992). "Illipe". Minor oil crops. FAO. Retrieved 2006-11-12.
- Aziz, KMA (2012). "Ghani". In Islam, Sirajul; Jamal, Ahmed A. (eds.). Banglapedia: National Encyclopedia of Bangladesh (Second ed.). Asiatic Society of Bangladesh. A ghani is a traditional Indian oil press, driven by a horse or ox.
- "Polyunsaturated Fats". Clark's Nutrition. Retrieved March 13, 2019.
- Eisenmenger, Michael; Dunford, Nurhan T.; Eller, Fred; Taylor, Scott; Martinez, Jose (2006). "Pilot-scale supercritical carbon dioxide extraction and fractionation of wheat germ oil". Journal of the American Oil Chemists' Society. 83 (10): 863–868. doi:10.1007/s11746-006-5038-6. S2CID 59940212.
- Feuge, R. O. "Vegetable Oils and Fats for Edible Use". usda.gov. Retrieved March 13, 2019.
Certain crude oils that contain minor amounts of impurities other than free fatty acids can be refined by a process known as steam refining. It is merely a high-temperature steam distillation under reduced pressure. The crude vegetable oil is heated to about 450° F. and maintained under a pressure of 0.25 inch of mercury or less while steam is passed through it. The steam strips the free fatty acids out of the oil. The ]:>roccss is used somewhat in Europe but not often in the United States.
- "CDC - NIOSH Pocket Guide to Chemical Hazards - Vegetable oil mist". www.cdc.gov. Retrieved 2015-11-27.
- Malaysian Palm Oil Industry, palmoilworld.org
- Oil Staple Crops Compared, gardeningplaces.com
- Global oil yields: Have we got it seriously wrong? Archived 2016-01-31 at the Wayback Machine, Denis J. Murphy, August 2009, aocs.org
- January 2009 (PDF). Oilseeds: World Market and Trade. FOP 1-09. USDA. 2009-01-12. Archived from the original (PDF) on 2013-03-09. Retrieved 2009-01-29., Table 03: Major Vegetable Oils: World Supply and Distribution at Oilseeds: World Markets and Trade Monthly Circular Archived 2010-10-18 at the Wayback Machine
- Corn Refiners Association. Corn Oil 5th Edition. 2006
- "US National Nutrient Database, Release 28". United States Department of Agriculture. May 2016. All values in this table are from this database unless otherwise cited.
- "Fats and fatty acids contents per 100 g (click for "more details"). Example: Avocado oil (user can search for other oils)". Nutritiondata.com, Conde Nast for the USDA National Nutrient Database, Standard Release 21. 2014. Retrieved 7 September 2017. Values from Nutritiondata.com (SR 21) may need to be reconciled with most recent release from the USDA SR 28 as of Sept 2017.
- "USDA Specifications for Vegetable Oil Margarine Effective August 28, 1996" (PDF).
- "Smoke Point of Oils". Baseline of Health. Jonbarron.org.
- "Avocado oil, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- Feramuz Ozdemir; Ayhan Topuz (May 2003). "Changes in dry matter, oil content and fatty acids composition of avocado during harvesting time and post-harvesting ripening period" (PDF). Elsevier. Retrieved 15 January 2020.
- Marie Wong; Cecilia Requejo-Jackman; Allan Woolf (April 2010). "What is unrefined, extra virgin cold-pressed avocado oil?". Aocs.org. The American Oil Chemists’ Society. Retrieved 26 December 2019.
- "Brazil nut oil, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- Katragadda, H. R.; Fullana, A. S.; Sidhu, S.; Carbonell-Barrachina, Á. A. (2010). "Emissions of volatile aldehydes from heated cooking oils". Food Chemistry. 120: 59–65. doi:10.1016/j.foodchem.2009.09.070.
- "Canola oil, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- "Coconut oil, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- "Corn oil, industrial and retail, all purpose salad or cooking, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- Wolke, Robert L. (May 16, 2007). "Where There's Smoke, There's a Fryer". The Washington Post. Retrieved March 5, 2011.
- "Cottonseed oil, salad or cooking, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- "Linseed/Flaxseed oil, cold pressed, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- Garavaglia J, Markoski MM, Oliveira A, Marcadenti A (2016). "Grape Seed Oil Compounds: Biological and Chemical Actions for Health". Nutrition and Metabolic Insights. 9: 59–64. doi:10.4137/NMI.S32910. PMC 4988453. PMID 27559299.
- Callaway J, Schwab U, Harvima I, Halonen P, Mykkänen O, Hyvönen P, Järvinen T (April 2005). "Efficacy of dietary hempseed oil in patients with atopic dermatitis". The Journal of Dermatological Treatment. 16 (2): 87–94. doi:10.1080/09546630510035832. PMID 16019622. S2CID 18445488.
- "Smoke points of oils" (PDF).
- "Olive oil, salad or cooking, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- "Palm oil, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- Vegetable Oils in Food Technology (2011), p. 61. sfnp error: no target: CITEREFVegetable_Oils_in_Food_Technology2011 (help)
- "Rice bran oil". RITO Partnership. Retrieved 22 January 2021.
- "Safflower oil, salad or cooking, high oleic, primary commerce, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- "Oil, sesame, salad or cooking". FoodData Central. fdc.nal.usda.gov.
- "Soybean oil, salad or cooking, (partially hydrogenated), fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- "Soybean oil, salad or cooking, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- "Walnut oil, fat composition, 100 g". US National Nutrient Database, United States Department of Agriculture.
- "Sunflower oil, 65% linoleic, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 15 November 2018.
- "Sunflower oil, less than 60% of total fats as linoleic acid, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- "Sunflower oil, high oleic - 70% or more as oleic acid, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- "Smoke Point of Oils". Baseline of Health. Jonbarron.org. 2012-04-17. Retrieved 2016-05-28.
- "Cottonseed oil, industrial, fully hydrogenated, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- "Palm oil, industrial, fully hydrogenated, filling fat, fat composition, 100 g". US National Nutrient Database, Release 28, United States Department of Agriculture. May 2016. Retrieved 6 September 2017.
- "British Colonial Policies and the Oil Palm Industry in the Niger Delta Region of Nigeria, 1900–1960" (PDF). African Study Monographs. 21 (1): 19–33. 2000. Archived (PDF) from the original on 16 January 2013.
- Bellis, Mary. "The History of Soaps and Detergents". About.com.
In 1864, Caleb Johnson founded a soap company called B.J. Johnson Soap Co., in Milwaukee. In 1898, this company introduced a soap made of palm and olive oils called Palmolive.
- Commercial Agriculture, the Slave Trade and Slavery in Atlantic Africa ISBN 978-1-847-01075-9 p. 22
- "Soybean Car". Popular Research Topics. Benson Ford Research Center. Retrieved 2006-10-23.
- Horstman, Barry M. (1999-05-21). "Philip W. Drackett: Earned profits, plaudits". The Cincinnati Post. E. W. Scripps Company. Archived from the original on 2005-12-05. Retrieved 2006-10-22.
- "World Soy Oil Production". The Soybean Processors Association of India. Archived from the original on 2019-01-04. Retrieved 2019-01-04.
- "Biodiesel Day". Days Of The Year. Retrieved 30 May 2015.
- Knothe, G. "Historical Perspectives on Vegetable Oil-Based Diesel Fuels" (PDF). INFORM, Vol. 12(11), p. 1103-1107 (2001). Retrieved 2007-07-11.
- Avril Group : Activity Report 2014, p. 58 harvnb error: no target: CITEREFAvril_Group_:_Activity_Report2014 (help)
- "Canola oil". Archived from the original on 2006-06-17. Retrieved 2006-07-31.
- "Waste cooking oil from catering premises". Retrieved 2006-07-31.
- H. Ramachandra Prabhu (2000). "Lipid peroxidation in culinary oils subjected to thermal stress". Indian Journal of Clinical Biochemistry. 15 (1): 1–5. doi:10.1007/BF02873539. PMC 3453543. PMID 23105229.
- Tańska, M; Roszkowska, B; Skrajda, M; Dąbrowski, G (2016). "Commercial Cold Pressed Flaxseed Oils Quality and Oxidative Stability at the Beginning and the End of Their Shelf Life". Journal of Oleo Science. 65 (2): 111–21. doi:10.5650/jos.ess15243. PMID 26782307.
- "Basic Labelling Requirements", Guide to Food Labelling and Advertising, Canadian Food Inspection Agency, retrieved 2015-04-08
- "Common Name - Fats and Oils" (PDF), Labelling Requirements for Fats and Oils, Canadian Food Inspection Agency, retrieved 2015-04-08
- "Regulation (EU) No 1169/2011 of the European Parliament and of the Council", Official Journal of the European Union, 2011-11-21
|Wikimedia Commons has media related to Vegetable oils.|
- Gupta, Monoj K. (2007). Practical guide for vegetable oil processing. AOCS Press, Urbana, Illinois. ISBN 978-1-893997-90-5.
- Jee, Michael, ed. (2002). Oils and Fats Authentication. Blackwell Publishing, Oxford, England. ISBN 1-84127-330-9.
- Salunkhe, D.K., Chavan, J.K., Adsule, R.N. and Kadam, S.S. (1992). World Oilseeds – Chemistry, Technology, and Utilization. Van Nostrand Reinhold, New York. ISBN 0-442-00112-6.CS1 maint: multiple names: authors list (link)