An inessential amino acid C4H8N2O3 that is an amide of aspartic acid. [1]


Asparagine, an amino acid carefully related to aspartic acid, and an essential component of proteins. First isolated in 1932 from asparagus, from which its name is obtained, asparagine is commonly distributed in plant proteins. It is one of a number of so-called excessive amino acids in warm-blooded animals: they can manufacture it from aspartic acid. [2]


A non-essential amino acid. Asparagine is crucial for the production of the body’s proteins, enzymes and muscle tissue. Supplements of this amino acid are declared to balance nervous system function.

Mechanism of action

Asparagine, a non-essential amino acid is very important in the metabolic process of harmful ammonia in the body through the action of asparagine synthase which connects ammonia to aspartic acid in an amidation response. Asparagine is likewise used as a structural part in numerous proteins. [3]


Asparagine was first separated in 1806 in a crystalline type by French chemists Louis Nicolas Vauquelin and Pierre Jean Robiquet (then a young assistant). It was isolated from asparagus juice, in which it is plentiful, thus the picked name. It was the first amino acid to be separated.

Three years later, in 1809, Pierre Jean Robiquet identified a compound from liquorice root with properties which he certified as extremely similar to those of asparagine, and which Plisson identified in 1828 as asparagine itself.

The decision of asparagine’s structure needed decades of research study. The empirical formula for asparagine was first determined in 1833 by the French chemists Antoine François Boutron Charlard and Théophile-Jules Pelouze; in the very same year, the German chemist Justus Liebig provided a more precise formula. In 1846 the Italian chemist Raffaele Piria dealt with asparagine with nitrous acid, which got rid of the molecule’s amine (– NH2) groups and transformed asparagine into malic acid. This exposed the particle’s fundamental structure: a chain of four carbon atoms. Piria believed that asparagine was a diamide of malic acid; nevertheless, in 1862 the German chemist Hermann Kolbe showed that this surmise was wrong; rather, Kolbe concluded that asparagine was an amide of an amine of succinic acid. In 1886, the Italian chemist Arnaldo Piutti (1857– 1928) discovered a mirror image or “enantiomer” of the natural kind of asparagine, which shared many of asparagine’s residential or commercial properties, however which also varied from it. [14] Because the structure of asparagine was still not fully known– the place of the amine group within the molecule was still not settled– Piutti synthesized asparagine and therefore released its true structure in 1888.

Structural function in proteins

Because the asparagine side-chain can form hydrogen bond interactions with the peptide backbone, asparagine residues are typically discovered near the start of alpha-helices as asx turns and asx motifs, and in comparable turn themes, or as amide rings, in beta sheets. Its function can be believed as “capping” the hydrogen bond interactions that would otherwise be pleased by the polypeptide backbone.

Asparagine also provides key websites for N-linked glycosylation, modification of the protein chain with the addition of carbohydrate chains. Typically, a carbohydrate tree can entirely be added to an asparagine residue if the latter is flanked on the C side by X-serine or X-threonine, where X is any amino acid with the exception of proline.

Asparagine can be hydroxylated in the HIF1 hypoxia inducible transcription factor. This adjustment prevents HIF1-mediated gene activation. [4]

Physical properties of Asparagine

  • White in color with a crystalline appearance
  • Polar
  • Uncharged
  • Dry powder, strong
  • Orthorhombic bisphenoidal crystals
  • Flammable in natur

Chemical residential or commercial properties of Asparagine

  • The molecular formula is C4H8N2O3.
  • Molecular weight: 132. 12
  • Neutral
  • Melting point: 234-235ºc
  • Boiling point: 438ºc
  • Insoluble in methanol, ethanol, ether, and benzene
  • Soluble in both acid and alkali however reasonably soluble in water
  • N: C ratio of asparagine is 2:4
  • Pka: 8.82
  • Solubility: 29400 mg/L at 25ºc
  • Isoelectric point: 5.41

Asparagine Biosynthesis

In previous research studies, it was found that aspartate synthesis takes place by amidation of aspartate by a response that is similar to that catalyzed by glutamine synthetase. But it was later discovered that asparagine is manufactured from aspartic acid and ammonia by the enzyme asparagine synthetase. The entire reaction that takes place is ATP-dependent amidotransferase responses. Oxaloacetate in transamination is the primary part in the biosynthesis of asparagine from which the entire process begins. Oxaloacetate is catalyzed by aspartate aminotransferase 1. L-asparagine is transformed from L-aspartate in a reaction catalyzed by the enzyme asparagine synthetase that utilizes L-glutamine as an amide donor. Magnesium ions and Adenosine Triphosphate (ATP) are needed for this reaction that involves the formation of a beta-aspartyladenylate intermediate which is then transformed to L-asparagine. In this process, ammonia is transferred from L-glutamine to produce l-glutamate and AMP. Asparagine synthetase in human beings is accountable for cellular stress because of transcription triggered by a gene situated on chromosome. [5]

How does L-asparagine operate in your body?

Amino acids, the building blocks of proteins, are a vital part of human metabolic process. They help in building important proteins, synthesizing neurotransmitters, and even creating hormonal agents.

When found within the cells of the body, L-asparagine is utilized as an amino acid exchange aspect. This implies that other amino acids outside of the cell can be exchanged for L-asparagine inside of the cell. This exchange is an essential part of a healthy metabolic process.

How does L-asparagine function in the context of cancer cells?

L-asparagine is linked to another amino acid, glutamine. In cancer cells, glutamine is necessary to support the survival and development of cancer cells.

Without adequate glutamine in the cell, cancer cells undergo apoptosis, or cell death. According to the research study, L-asparagine is able to secure cancer cells from passing away due to a loss of glutamine.

There’s likewise a link in between asparagine, glutamine, and capillary development. In malignant growths, blood vessel formation is needed for the growth to grow and make it through.

The researchers found that in particular cells, depleting levels of asparagine synthetase impaired the development of new members vessels. This impact took place even when enough glutamine was present to theoretically grow capillary in tumors.

L-asparagine doesn’t really trigger breast cancer, or any cancer, to spread out. Instead, it helps produce glutamine which in turn plays a role in the formation of new members vessels.

L-asparagine assists sustain the metabolic procedures that allow all cells, consisting of cancer cells, to grow.

Can asparagus assist fight cancer?

Beyond sometimes making your urine smell weird, asparagus really has a lot of health advantages. This low-calorie food is high in nutrients such as vitamin B-12 and vitamin K.

In addition, it might help with weight reduction, decreasing high blood pressure, and enhancing digestion health. But can asparagus aid fight cancer?

In one in-vitro research study, different asparagus components were isolated and evaluated for their toxicity against colon cancer cells. The scientists found that certain asparagus compounds, called saponins, showed anticancer activity in the presence of these cells.

In another research study, researchers investigated the effect of asparagus polysaccharide and asparagus gum on liver cancer cells. Using a transcatheter arterial chemoembolization therapy, a kind of chemotherapy, in combination with these 2 asparagus compounds was revealed to considerably inhibit liver tumor growth.

L-asparaginase, a present treatment for leukemia and non-Hodgkin’s lymphoma, is effective due to the fact that it blocks the capability of L-asparagine to protect cancer cells, specifically lymphoma cells.

Asparagus substances have been looked into for many years as a possible cancer therapy. This research study assists to more establish the potential cancer-fighting benefits of eating several plant-based foods.

From breast cancer to colon cancer, the outcomes appear to show that consuming asparagus may be helpful in battling cancer.

However, since many of these compounds aren’t exclusive to asparagus, the benefit isn’t limited to simply asparagus and might be discovered in numerous other veggies. [6]

Health benefits

Heart health

Asparagus is good for your ticker in a variety of ways. Flores kept in mind, “Asparagus is very high in vitamin K, which helps blood clot.” And the vegetable’s high level of B vitamins assists regulate the amino acid homocysteine, too much of which can be a serious danger consider heart disease, according to Harvard University School of Public Health.

Asparagus likewise has more than 1 gram of soluble fiber per cup, which reduces the risk of heart problem, and the amino acid asparagine helps flush your body of excess salt. Lastly, asparagus has exceptional anti-inflammatory results and high levels of anti-oxidants, both of which may help in reducing the threat of cardiovascular disease.

Managing blood glucose

The Mayo Center keeps in mind that vitamin B6 may affect blood sugar levels and recommends care for people who have diabetes or low blood sugar. However, those with healthy levels can gain from asparagus’s capability to manage it.

Reducing the risk of type 2 diabetes

Similar to heart problem, danger of type 2 diabetes increases with excessive swelling and oxidative tension. Therefore, asparagus’ remarkable anti-inflammatory properties and high levels of anti-oxidants make it a good preventive food. A 2011 research study released in the British Journal of Nutrition likewise suggested that asparagus’ ability to improve insulin secretion and improve beta-cell function likewise assists lower the risk of type 2 diabetes. Beta cells are distinct cells in the pancreas that produce, save and release insulin.

Anti-aging benefits

The antioxidant glutathione is thought to slow the aging process, according to a 1998 article in The Lancet journal. And the folate that asparagus supplies works with B12 to prevent cognitive decline. A Tufts University research study discovered that older adults with healthy levels of folate and B12 carried out better during a test of response speed and psychological flexibility than those with lower levels of folate and B12.


Yet another amazing thing about the antioxidant glutathione: it assists secure the skin from sun damage and pollution. A little 2014 study published in Scientific, Cosmetic, and Investigational Dermatology studied healthy adult women ages 30-50 who used a glutathione lotion to half their faces and a placebo cream to the other half for 10 weeks. The glutathione side saw increased wetness, suppressed wrinkle development and smoother skin. It is unidentified if eating glutathione-rich foods like asparagus would produce a comparable effect.

Keeping you cleansed and avoiding kidney stones

Asparagus can act as a natural diuretic, according to a 2010 research study released in the West Indian Medical Journal. This can assist rid the body of excess salt and fluid, making it specifically great for people suffering from edema and hypertension. It likewise helps flush out contaminants in kidneys and avoid kidney stones. On the other hand, the National Institutes of Health advises that people who are struggling with uric acid kidney stones ought to prevent asparagus.

Pregnancy health

Flores kept in mind asparagus’ significant quantity of folate, which she stated “is essential for females of childbearing age to consume daily.” Folate can decrease the threat of neural-tube flaws in fetuses, so it is vital that mothers-to-be get enough of it.

Digestion health

” Asparagus is known to assist stabilize food digestion due to the high quantity of fiber and protein that it consists of,” stated Flores. “Both help move food through the gut and offer remedy for pain throughout digestion.”.

According to The Ohio State University, asparagus contains inulin, a distinct dietary fiber related to improved food digestion. Inulin is a prebiotic; it does not get broken down and absorbed until it reaches the large intestinal tract. There, it nurtures germs understood to improve nutrient absorption, reduce allergic reactions and reduce the danger of colon cancer.

Why does asparagus make urine smell?

According to Smithsonian publication, asparagus is the only food to include the chemical asparagusic acid. When this appropriately named chemical is absorbed, it breaks down into sulfur-containing substances, which have a strong, undesirable fragrance. They are likewise unpredictable, which indicates that they can vaporize and get in the air and your nose. Asparaguisic acid is not unpredictable, so asparagus itself doesn’t smell.

What’s weirder than a vegetable triggering smelly pee? The truth that not everybody can smell it. Researchers aren’t totally sure why this is. Many proof seems to suggest that not everybody can smell the smell, though some researchers think that not everyone produces it.

In 2016, The BMJ medical journal released a study in which scientists examined information from The Nurses’ Health Study, a large-scale study including almost 7,000 individuals of European descent, to help determine if there is a genetic basis for smelling asparagusic acid. More than half of the participants might not smell it and researchers discovered that hereditary variations near olfactory receptor genes was connected with the capability to spot the smell. The scientists recommended treatments could potentially be developed to turn smellers into non-smellers and therefore increase the potential for eating healthy asparagus.

Whether you can smell it or not, there are no hazardous effects to producing, or smelling, the smell in urine.

Asparagus facts

According to the Michigan Asparagus Board Of Advisers:.

  • Asparagus is available in three ranges: American and British, which is green; French, which is purple; and Spanish and Dutch, which is white.
  • Asparagus was first cultivated about 2,500 years back in Greece. “Asparagus” is a Greek word, indicating stalk or shoot.
  • The Greeks believed asparagus was an organic medication that would treat toothaches and avoid bee stings, to name a few things.
  • Galen, a second-century physician, described asparagus as “cleansing and recovery.” Claims for medicinal benefits of asparagus persist to this day.
  • The Romans became fantastic enthusiasts of asparagus, and grew it in high-walled courtyards. In their conquests, they spread it to the Gauls, Germans, Britons and from there, the rest of the world.
  • The top asparagus-producing states are California, Washington and Michigan.
  • Asparagus spears grow from a crown that is planted about a foot deep in sandy soils.
  • Under perfect conditions, an asparagus spear can grow 10 inches in 24 hr.
  • Each crown will send out spears up for about 6-7 weeks during the spring and early summer season.
  • The outdoor temperature determines how much time will be in between each picking. Early in the season, there might be four or five days in between pickings and as the days and nights get warmer, a particular field may need to be picked every 24 hr.
  • After gathering is done, the spears grow into ferns, which produce red berries and the food and nutrients essential for a healthy and efficient crop the next season.
  • An asparagus planting is usually not collected for the very first 3 years after the crowns are planted, permitting the crown to establish a strong fibrous root system.
  • A well-cared-for asparagus planting will typically produce for about 15 years without being replanted.
  • The bigger the diameter, the much better the quality! [7]

Food sources which contain Asparagine

  • Beef
  • Poultry
  • Eggs
  • Fish
  • Dairy
  • Whey
  • Seafood
  • Asparagus
  • Legumes
  • Potatoes
  • Nuts
  • Seeds
  • Soy
  • Whole grains

Foods low in asparagine consist of most vegetables and fruits. [8]
It is offered in various food sources. It is not necessary for people as they are integrated from metabolic pathway transnational. A few of them are stated below.

They are found in big quantity as plant proteins.

Plant sources include entire grains, soy, nuts, legumes, asparagus, seeds, and potatoes (as pointed out above).

Animal sources for asparagine consist of numerous seafood, whey, poultry, beef, eggs, fish, lactalbumin, and dairy items (as pointed out above).

They are found in roasted coffee and french fries.

Asparagine Deficiency

Shortage symptoms caused by asparagine are as follows:.

  • Psychosis
  • Headaches
  • Confusions
  • Anxiety
  • Irritation [9]

What Are Negative Effects of Elspar?

Typical side effects of Elspar consist of:.

  • Discomfort or swelling at the injection site,
  • Queasiness or throwing up (might be severe),
  • Stomach cramps,
  • Loss of appetite,
  • Weight loss,
  • Headache,
  • Lack of energy,
  • Sleepiness,
  • Skin rash or itching,
  • Anxiety,
  • Swelling in your hands, ankles, or feet,
  • Headache,
  • Tiredness, or
  • Irritability [10]

L-Asparagine and Acrylamide

In 2002, Swedish scientists released a study in the medical journal “Nature” that sent out shockwaves through the health community. The research study showed that L-Asparagine integrated with sugars or starches in cooked foods produced a chemical called Acrylamide.

Acrylamide is a chemical that has been revealed to cause cancer at high levels in lab tests with animals. The levels of Acrylamide were greatest in starchy foods which had been fried, such as potato chips and French french fries.

Roasting and baking also showed conversion of L-Asparagine with sugars to create Acrylamide. The report triggered a world-wide news craze and increase in clinical studies to find the actual threats related to cancer in lots of foods.

The Food and Agriculture Company (FAO) and the World Health Company (WHO) immediately started a consultation of professionals. They concluded in a report that there were no negative results revealed to connect foods such as French fries and potato chips with cancer due to the fact that the quantities of Acrylamide found were so little.

However, they did acknowledge the need for concern and further screening, and they recommended a different diet plan of vegetables and fruits as well as a cautioning to not eat overcooked food.

In 2008, four companies agreed to fines and to decrease the amounts of Acrylamide in foods in response to being taken legal action against by the state of California.

The United States Fda (FDA) launched a declaration in May of 2008 that echoed the findings of the FAO and WHO in 2002. The FDA warned consumers about overcooking food and encouraged a well balanced diet while research studies continue. [11]

Toxicology Info

Severe Symptoms/Signs of exposure: Eyes: Inflammation, tearing, itching, burning, conjunctivitis. Skin: Soreness, itching.

Ingestion: Irritation and burning experiences of mouth and throat, queasiness, vomiting and stomach discomfort. Inhalation: Irritation of mucous membranes, coughing, wheezing, shortness of breath,.

Persistent Effects: No details found.

Sensitization: none anticipated.

Stability and Reactivity

Prevent heat and moisture.

  • Stability: Steady under regular conditions of use and storage.
  • Incompatibility: Strong oxidizers
  • Service life: Indefinite if saved appropriately.

Handling and Storage

Handling: Utilize with appropriate ventilation and do not breathe dust or vapor. Avoid contact with skin, eyes, or clothing. Wash hands completely after handling.

Storage: Shop in General Storage Area [Green Storage] with other items with no particular storage hazards. Store in a cool, dry, well-ventilated, locked store room far from incompatible products. [12]

Bottom Line

Asparagine is a non-essential amino acid in human beings, Asparagine is a beta-amido derivative of aspartic acid and plays a crucial function in the biosynthesis of glycoproteins and other proteins. A metabolic precursor to aspartate, Asparagine is a nontoxic carrier of residual ammonia to be gotten rid of from the body. Asparagine functions as diuretic.

L-asparagine is an optically active form of asparagine having L-configuration. It has a function as a nutraceutical, a micronutrient, a human metabolite, a Saccharomyces cerevisiae metabolite, an Escherichia coli metabolite, a mouse metabolite and a plant metabolite. It is an aspartate household amino acid, a proteinogenic amino acid, an asparagine and a L-alpha-amino acid. It is a conjugate base of a L-asparaginium. It is a conjugate acid of a L-asparaginate. It is an enantiomer of a D-asparagine. It is a tautomer of a L-asparagine zwitterion. [13]


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