4-Aminoantipyrine (4-AAP), chemically known as 4-amino-1,5-dimethyl-2-phenylpyrazol-3-one, is a heterocyclic organic compound with the molecular formula C₁₁H₁₃N₃O. This compound, recognized by its yellow crystalline appearance and mild odor, occupies a unique position in both pharmaceutical and analytical chemistry due to its diverse reactivity and functional properties. As a metabolite of aminopyrine and metamizole, 4-AAP inherits pharmacological activities such as analgesic, anti-inflammatory, and antipyretic effects. Simultaneously, its ability to form stable complexes with metals and carbonyl compounds has made it indispensable in analytical methods for detecting phenols, glucose, and uric acid. This article explores the synthesis, chemical properties, biological applications, and analytical significance of 4-Aminoantipyrine, highlighting its versatility across scientific disciplines.
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C.F |
C11H13N3O |
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E.M |
203 |
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M.W |
203 |
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m/z |
203 (100.0%), 204 (11.9%), 204 (1.1%) |
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E.A |
C, 65.01; H, 6.45; N, 20.68; O, 7.87 |
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Synthetic antipyrine:
1. 4-aminoantipyrine was obtained by nitrosation of antipyrine with sodium nitrite, reduction of ammonium bisulfite and ammonium sulfite, hydrolysis with sulfuric acid, and neutralization with liquid ammonia.
The process is as follows:
Antipyrine is mixed with sulfuric acid to form a solution. The solution and sodium nitrite solution were simultaneously flowed into the nitrosation reactor, and the reaction was carried out under stirring. The end point of the reaction was measured with iodine powder and starch test paper to adjust the water flow. Nitroso antipyrine produced by nitrosation immediately flows into the reduction tank and reacts with the aqueous solution of ammonium bisulfite and ammonium bisulfite prepared in the tank. After the reduction, temperature rise and hydrolysis. Cool down and neutralize with liquid ammonia, and stand for layering. The waste water was separated to obtain product oil (content more than 80%). It was pressed into the crystallization tank, stirred, cooled and crystallized, and filtered to obtain 4 aminoantipyrine.
2. 4 aminoantipyrine was obtained by nitrosation of antipyrine, reduction with ammonium bisulfite and ammonium sulfite, hydrolysis with sulfuric acid, and neutralization with liquid ammonia.
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4-aminoantipyrine is an organic compound with specific biological activity, widely used in the fields of biochemistry and medicine.
1. Participate in glucose measurement:
In the presence of peroxidase and phenol, specific chemical reactions can occur with glucose to generate colored compounds, which can be used for glucose determination. This characteristic makes it of great significance in biochemical research.
2. As a color developer:
It can also be used as a chromogenic reagent for the photometric determination of phenols, alcohols, and amine organic compounds. By reacting chemically with these organic compounds, compounds with specific colors can be generated, enabling quantitative analysis of these organic compounds.
3. Drug synthesis:
It is an intermediate of the drug metamaterial. Analytica is a commonly used antipyretic and analgesic drug with significant antipyretic, analgesic, and anti-inflammatory effects. It played a crucial role in the synthesis process of metamaterial, enabling it to possess these pharmacological activities.
In clinical medicine, it is commonly used for the determination of glucose. By collecting blood samples from patients, adding them to reagents containing peroxidase and phenol, and then adding the product. Under specific conditions, it can undergo a chemical reaction with glucose to produce colored compounds. By measuring parameters such as absorbance or fluorescence intensity of this colored compound, the concentration of glucose in the sample can be calculated. This method has the advantages of high sensitivity, high accuracy, and easy operation, and has been widely used in clinical practice.
2. Environmental monitoring:
It can also be used for the determination of phenolic compounds in environmental monitoring. Phenolic compounds are common environmental pollutants that pose potential hazards to human health and the ecological environment. By collecting environmental water or soil samples and adding them to a reagent containing 4-aminoantipyrine, a chemical reaction is carried out under specific conditions. By measuring parameters such as absorbance of reaction products, the concentration of phenolic compounds in the sample can be calculated. This method provides strong support for environmental monitoring and pollution control.
4-Aminoantipyrine, as an organic compound, plays an important role in various fields such as medicine, chemical analysis, and industrial manufacturing due to its unique chemical properties and wide application value.
Non steroidal anti-inflammatory and antipyretic drugs
4 Aminoantipyrine is mainly used as a nonsteroidal anti-inflammatory drug and antipyretic drug in the pharmaceutical field. It reduces pain and inflammation by inhibiting cyclooxygenase and blocking the synthesis of prostaglandins in the inflammatory response. At the same time, it also has an antipyretic effect and is commonly used to treat symptoms such as colds and fever. Due to its analgesic, antipyretic, and anti-inflammatory effects, 4 aminoantipyrine has a wide range of applications in the treatment of mild to moderate pain, fever reduction, and inflammation.
Drug synthesis intermediates
4 Aminoantipyrine can also be used as an intermediate in the drug analgin. Analgin is a commonly used antipyretic and analgesic drug. By synthesizing intermediates such as 4 aminoantipyrine, drugs with higher efficacy and lower side effects can be prepared.
It should be noted that caution should be exercised when using 4 aminoantipyrine, and the doctor's advice and dosage should be followed. Common side effects include gastrointestinal discomfort, dizziness, rash, allergic reactions, etc. Some people may be allergic to this medication and should stop using it immediately and seek medical attention.
Testing alcohols and amines
4 Aminoantipyrine can be used in the field of chemical analysis to determine alcohols and amines. Through specific chemical reactions, the content and types of alcohols and amine compounds in the sample can be accurately detected. This application is of great significance for quality control in industries such as chemical and pharmaceutical industries.
Determination of phenolic compounds in the atmosphere and water
In addition, 4 aminoantipyrine can also be used to determine phenolic compounds in the atmosphere and water. Phenolic compounds are a common class of environmental pollutants with potential hazards to human health and environmental quality. By utilizing the specific chemical reaction properties of 4 aminoantipyrine, rapid and accurate detection of phenolic compounds can be achieved.
Dye synthesis intermediates
In the field of dye synthesis, 4 aminoantipyrine can be used as an intermediate in dye synthesis. Dyes with specific colors and properties can be prepared by reacting with other compounds. These dyes are widely used in industries such as textiles, leather, and paper, providing products with rich colors and decorative effects.
Raw materials for rubber anti-aging agents
In addition, 4 aminoantipyrine can also be used as a raw material for rubber anti-aging agents. Rubber anti-aging agent is an additive that can extend the service life of rubber products. The anti-aging agent prepared by reacting 4 aminoantipyrine with other compounds can effectively prevent the occurrence of aging, hardening, and cracking of rubber products.
4-Aminoantipyrine (also known as acetaminophen) is a commonly used over-the-counter medication used to alleviate symptoms such as headache, fever, joint pain, and muscle pain. Its molecular structure is as follows:
-Molecular formula: C11H16N2O
-Molecular weight: 192.26 g/mol
The molecular structure is described as follows:
Benzene ring structure: The molecule of acetaminophen contains a benzene ring structure consisting of 6 carbon atoms and 5 hydrogen atoms. This benzene ring is one of the important skeletons of the molecule.
Pyridine ring structure: In addition to the benzene ring, the molecule also contains a pyridine ring structure composed of a nitrogen-containing five membered ring. This pyridine ring is connected to a specific position on the benzene ring.
Amino group: An amino group (NH ₂) is attached to the pyridine ring, where one hydrogen atom is replaced with an amino group. This amino group endows the drug with specific biological activity.
Ether bond: The amino group on the pyridine ring is connected to an ether bond (O), which is connected to a carbon atom on the benzene ring. This type of connection plays an important role in the molecular structure.
Substitution group: A carbon atom on the benzene ring is connected to a methyl group (CH æ), which is one of the substituents of acetaminophen molecules.
Analytical Chemistry Applications
► Phenol Detection
4-Aminoantipyrine is the gold standard reagent for colorimetric phenol determination. The reaction mechanism involves:
Oxidation: Phenol is oxidized by potassium ferricyanide (K₃[Fe(CN)₆]) in alkaline medium (pH 10) to form a phenoxy radical.
Coupling: The radical reacts with 4-AAP to form a red-colored Schiff base (λₘₐₓ = 510 nm).
Quantification: Absorbance is measured spectrophotometrically, with a detection limit of 0.1 μg/mL.
This method is widely applied in:
Environmental Monitoring: Detecting phenolic pollutants in wastewater and drinking water.
Industrial Quality Control: Assessing phenol content in disinfectants and resins.
Clinical Toxicology: Screening for phenol poisoning.
► Glucose and Uric Acid Assays
4-AAP is integral to enzymatic assays for glucose and uric acid:
Glucose Determination: Glucose oxidase oxidizes glucose to gluconic acid and H₂O₂. Peroxidase then catalyzes the reaction between H₂O₂ and 4-AAP with phenol, forming a pink quinoneimine dye (λₘₐₓ = 505 nm).
Uric Acid Assay: Uricase converts uric acid to allantoin and H₂O₂, which reacts similarly with 4-AAP to produce a colored product.
These assays are critical in diabetes management and gout diagnosis.
► Metal Ion Chelation
The amino and carbonyl groups of 4-AAP form stable complexes with metal ions. For example:
Fe³⁺ Complex: Used in water hardness determination.
Cu²⁺ Complex: Applied in catalytic oxidation reactions.
The stability constants (log K) for these complexes range from 10 to 15, enabling selective metal ion separation.
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