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Urea is an organic compound that is widely used in agriculture and is the main nitrogen-containing substance in the urine of mammals. It is produced in the liver and is the metabolic byproduct of protein and nitrogen metabolism. Urea is also known as carbamide and is highly soluble in water. It has been reported to be effective against many pathological conditions, but its biological role remains controversial as some studies have reported its toxic effects. Urea was first discovered and isolated from human urine by H.M. Rouelle in 1773 and was later synthesized by Friedrich Wöhler in 1828, which disproved the concept of vitalism.
| Characteristics | Values |
|---|---|
| What is urea? | An organic compound |
| What is it made from? | Two ammonia molecules and a carbon dioxide molecule |
| Where is it made? | The liver |
| What does it do in the body? | Plays a role in the cellular metabolism of nitrogen-containing compounds |
| What does it do outside the body? | Used in fertilizers, pharmaceuticals, resins, and animal feed |
| Is it toxic? | Practically non-toxic, but high concentrations can be lethal |
| What does it look and feel like? | A colorless, odorless solid that is highly soluble in water |
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What You'll Learn
Urea is produced in the liver
Urea is an organic compound that is produced in the liver and plays a crucial role in the body's metabolic processes. It is the end product of nitrogenous metabolism in higher organisms and is essential for eliminating excess nitrogenous waste from the body. This waste is excreted through urine, and urea is, in fact, the main nitrogen-containing substance in the urine of mammals.
The production of urea occurs through the Urea Cycle, also known as the Krebs-Henseleit Cycle, which takes place in the liver cells, specifically in their mitochondria and cytoplasm. This cycle is responsible for metabolizing small chains of amino acids that are not used for new protein production, converting them into energy for the body. When amino acids are metabolized in the liver, they produce free ammonia and carbon dioxide. Ammonia is highly toxic, so the body rapidly converts it into urea during the Urea Cycle.
The process begins in the mitochondria, where ammonia and carbon dioxide, with the help of ATP, form carbamyl phosphate. This then combines with another amino acid, ornithine, from the cytoplasm, with the enzyme ornithine trans-carbamylase, to form citrulline. Citrulline is then transported back into the cytoplasm, where it undergoes further reactions to eventually produce urea.
Urea, being a soluble compound, can be easily absorbed into the bloodstream and transported to the kidneys for excretion. This process is vital for maintaining the body's nitrogen balance and preventing a dangerous buildup of ammonia, which could be fatal. Urea also plays a role in water balance, signalling the body to produce hyper-concentrated urine and prevent excessive water loss.
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It is the main nitrogen-containing substance in the urine of mammals
Urea is an organic compound that is produced in the liver and excreted in urine. It is the main nitrogen-containing substance in the urine of mammals. The body uses it in many processes, the most notable one being nitrogen excretion.
Urea is formed by combining two ammonia molecules with a carbon dioxide molecule in the urea cycle. This cycle involves the conversion of the amino acid L-ornithine into different intermediates before being regenerated. The chemical reaction for this process is 2 NH3 (ammonia) + CO2 + 3 ATP + H2O → H2N-CO-NH2 (urea) + 2 ADP + 4 Pi + AMP. This process is essential to normal health and is regulated by a wide variety of conditions.
Urea is a colourless, odourless solid that is highly soluble in water and practically non-toxic. It is widely used in fertilisers as a source of nitrogen and is an important raw material for the chemical industry. The discovery of urea can be traced back to the early 18th century when Herman Boerhaave first noticed it in the evaporates of urine.
Urea has been found to have therapeutic effects, such as increased growth, improved digestion, and reduced hepatic dysfunction. It also induces apoptosis in tumour cells and has neuroprotective properties. However, it is important to note that high concentrations of urea in the blood can be damaging, and it has been linked to cardiovascular disease and other toxic effects.
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Urea is widely used in fertilizers
Urea is the main nitrogen-containing substance in the urine of mammals. It is a colorless, odorless solid, highly soluble in water, and practically non-toxic. It is the simplest amide of carbamic acid. Urea serves an important role in the cellular metabolism of nitrogen-containing compounds by animals.
Urea is mostly marketed in solid form, either as prills or granules, for its main use as a fertilizer. It is often used as a nitrogen-release fertilizer, providing an excellent source of nitrogen for crop production. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use, making it a cost-effective option for farmers.
However, it is important to note that urea should not be used with small or fast-moving augers as the particles are soft and can break. It should also be stored separately from ammonium nitrate to prevent the rapid absorption of water when the relative humidity is above 18%. Urea can be modified to enhance its efficiency in agricultural use, such as by encapsulating it in an inert sealant or converting it into derivatives like urea-formaldehyde compounds.
The use of urea as a fertilizer has been studied extensively, with research spanning several decades. For example, studies in Lamberton since 1960 have shown that spring applications of urea resulted in higher corn yields compared to fall applications. Additionally, controlled-release or slow-release fertilizers containing urea have been found to reduce NH3 losses significantly.
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It can be synthesized from a nonbiological starting material
Urea is an organic compound with the chemical formula CO(NH2)2. It is produced in the liver and is a metabolic by-product of protein and nitrogen metabolism. It is highly soluble in water and practically non-toxic. It is widely used in fertilizers as a source of nitrogen and is an important raw material for the chemical industry.
In 1828, German chemist Friedrich Wöhler obtained urea artificially by treating silver cyanate with ammonium chloride. This was the first time an organic compound was synthesized from inorganic starting materials without the involvement of living organisms. Wöhler's discovery contradicted the widely held doctrine of vitalism, which stated that only living organisms could produce the chemicals of life.
Wöhler's synthesis of urea from nonbiological starting materials was a significant milestone in the history of chemistry. It showed that a substance previously known only as a byproduct of life could be created in a laboratory without biological starting materials. This insight was important for the development of organic chemistry and the understanding of the chemical processes involved in life.
Today, urea is prepared commercially in vast amounts from liquid ammonia and liquid carbon dioxide. These two materials are combined under high pressure and elevated temperatures to form ammonium carbamate, which then decomposes at lower pressures to yield urea and water. This process is known as the "total recycle process" and was developed in the 1940s to 1960s.
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It is used in instant-cold packs
Urea is an organic compound with the chemical formula CO(NH2)2. It is produced in the liver and serves as the metabolic byproduct of protein and nitrogen metabolism. It is highly soluble in water and practically non-toxic. Urea is widely used in fertilizers as a source of nitrogen and is an important raw material for the chemical industry.
Urea is also used in instant cold packs, which are commonly found in first-aid kits and used for icing injuries and keeping food cold. These instant cold packs are stored at room temperature and only turn cold when squeezed. They contain water and a chemical reactor, which is typically ammonium nitrate, calcium ammonium nitrate, or urea. When the bag is squeezed, the water mixes with the chemical, initiating a reaction that lowers the temperature of the water to near freezing.
Urea is now being used as a replacement for ammonium nitrate in instant cold packs because it is much less hazardous. Urea is the least concerning reactor among the three chemicals used in instant cold packs. However, it can still cause adverse effects if a significant amount is swallowed, including nausea, vomiting, dizziness, drowsiness, and confusion.
The use of urea in instant cold packs demonstrates its versatility as a compound and its ability to induce an endothermic reaction when dissolved in water. This application of urea contributes to its importance in the medical field, providing a convenient and relatively safe way to treat injuries and reduce inflammation.
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Frequently asked questions
Urea, also known as carbamide, is an organic compound with the chemical formula CO(NH2)2. It is produced in the liver and is the metabolic byproduct of protein and nitrogen metabolism.
No, urea is not made in muscles. It is produced in the liver, which forms it by combining two ammonia molecules with a carbon dioxide molecule in the urea cycle.
Urea was first discovered and isolated from human urine by H.M. Rouelle in 1773. It was then successfully synthesized in 1828 by Friedrich Wohler, who demonstrated that it could be synthesized from a non-biological starting material.
Urea serves an important role in the cellular metabolism of nitrogen-containing compounds by animals. It is the main nitrogen-containing substance in the urine of mammals and plays a role in nitrogen excretion.
Urea has been found to have several therapeutic effects, including increased growth, improved digestion, and reduced hepatic dysfunction. It also induces apoptosis of tumor cells and exhibits neuroprotective properties.
