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Acetate

physical science Maturity 11-13 Next article →

Acetate is a versatile chemical group that plays a vital role in industry and biology. Formally, an acetate is a salt created when acetic acid combines with a base. This base might be metallic, nonmetallic, alkaline, or even earthy. In chemistry, the term also refers to the acetate ion, which is a negatively charged particle called an anion. This anion is typically found in aqueous solutions. When this anion joins with a positive ion, called a cation, it forms a neutral molecule. These resulting compounds are commonly called acetates, such as acetate of lead or acetate of aluminium.

Acetate-anion-canonical-form-2D-skeletal
Acetate-anion-canonical-form-2D-skeletal

Chemists use specific rules to name and write these substances. The systematic name for the acetate ion is ethanoate. However, the common name, acetate, remains the preferred name used by IUPAC. The chemical formula for the acetate ion can be written in several ways, such as CH3COO-, C2H3O2-, or simply AcO-. Scientists sometimes use the abbreviation OAc- to represent the group. It is important to be careful with these symbols to avoid mistakes. For example, the symbol "Ac" can sometimes represent the entire acetate ion. This must not be confused with actinium, which is a specific element in the actinide series.

Acetate-ester-2D-skeletal
Acetate-ester-2D-skeletal

Acetate exists in several different forms, including salts and esters. Acetate salts are often ionic and tend to dissolve very well in water. You can actually create a common salt, sodium acetate, at home. If you combine vinegar with sodium bicarbonate, a reaction occurs. This reaction produces sodium acetate, water, and carbon dioxide gas. Other important salts include aluminium acetate, which is used in dyeing processes. Ammonium acetate serves as a precursor to acetamide, and potassium acetate is used as a diuretic. These specific salts are usually colorless and highly soluble.

Acetate-ester-2D-skeletal
Acetate-ester-2D-skeletal

Acetate esters represent another major category of these compounds. An ester is a molecule with the general formula CH3CO2R, where R is an organyl group. Unlike many salts, acetate esters are often liquids. They are frequently lipophilic, meaning they dissolve in fats, and can be volatile. These chemicals are very popular in the marketplace for several reasons. They are inexpensive and generally have low toxicity. Most importantly, they often have pleasant, sweet odors. Because of this, they are used widely in various products.

Acetate-ester-2D-skeletal
Acetate-ester-2D-skeletal

Industrial production of acetate is massive in scale. Every year, industry produces approximately 5 million tonnes of acetic acid. About half of this production is used to create vinyl acetate. This chemical is a precursor to polyvinyl alcohol, which is a component in many paints. The second largest industrial use is for the production of cellulose acetate. In industrial jargon, the word "acetate" often refers specifically to cellulose acetate. This material is used to manufacture fibers and diverse products like audio record discs. Many industrial solvents, such as ethyl acetate and methyl acetate, are also acetates.

E. coli Bacteria (7316101966)
E. coli Bacteria (7316101966)

In the world of biology, acetate is a fundamental building block for biosynthesis. Most organisms utilize acetate in the form of acetyl coenzyme A, or acetyl-CoA. In certain bacteria like E. coli, a specific fermentation pathway exists. This process converts pyruvate into acetyl-CoA using the enzyme pyruvate dehydrogenase. Then, two other enzymes, phosphate acetyltransferase and acetate kinase, convert acetyl-CoA into acetate. This specific sequence allows the bacteria to produce ATP, which is energy. This mixed acid fermentation is a characteristic trait of the Enterobacteriaceae family.

E. coli Bacteria (7316101966)
E. coli Bacteria (7316101966)

Acetate also interacts with complex biological systems in the body. Research has shown that acetate can have immunomodulatory properties. This means it can affect how the innate immune response reacts to bacteria like Haemophilus influenzae. There is also a connection between acetate and how the body processes ethanol. Some researchers propose that acetate resulting from the oxidation of ethanol may contribute to hangovers. In studies with rats, injecting sodium acetate was found to induce headaches. Additionally, increased levels of serum acetate can lead to the accumulation of adenosine in tissues, including the brain.

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File:Acetate-ester-2D-skeletal.png
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File:E. coli Bacteria (7316101966).jpg
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