Miscellaneous

How does salicylic acid work in aspirin?

How does salicylic acid work in aspirin?

This unique drug belongs to a family of compounds called the salicylates, the simplest of which is salicylic acid, the principal metabolite of aspirin. Salicylic acid is responsible for the anti-inflammatory action of aspirin, and may cause the reduced risk of colorectal cancer observed in those who take aspirin.

What is the mechanism of action of salicylic acid?

Mechanism of action Salicylic acid works by causing the cells of the epidermis to slough off more readily, preventing pores from clogging up, and allowing room for new cell growth.

How is salicylic acid converted into aspirin give reaction?

For the preparation of aspirin, salicylic acid is reacted with an excess of acetic anhydride. Small amount of strong acid is used as a catalyst in these reactions which enhances the speed of reaction acid used is phosphoric acid. Excess acetic acid will be extinguished with the addition of water.

What is the pharmacokinetics of aspirin?

Pharmacology/Pharmacokinetics Aspirin is rapidly absorbed in the upper gastrointestinal (GI) tract and results in a measurable inhibition of platelet function within 60 minutes. This antiplatelet effect is associated with prolongation of the bleeding time and inhibition of TXA2-dependent platelet aggregation.

Which of the following is the first step of the reaction mechanism for aspirin synthesis?

The first step of the synthesis involves mixing salicylic acid with ethanoic anhydride. This reaction would be very slow without a catalyst.

How does aspirin toxicity occur?

Aspirin poisoning can occur rapidly after taking a single high dose or develop gradually after taking lower doses for a long time. Symptoms may include ringing in the ears, nausea, vomiting, drowsiness, confusion, and rapid breathing. The diagnosis is based on blood tests and the person’s symptoms.

What is the principle behind the preparation of aspirin?

Principle : Synthesis of Aspirin from salicylic acid occurs by acetylating process in acidic medium. Salicylic acid interacts with acetic anhydrides in presence of few drops of conc. sulphuric acid to produce aspirin and a molecule of acetic acid.

What is the hydrolysis product of aspirin give the chemical reaction involved?

Thus, when Aspirin undergoes hydrolysis, the degradation products are salicylic acid and acetic acid. Salicylic acid forms violet-blue complexes with Fe3+ ions. The intensity of the colour depends on the salicylic acid concentration in a sample.

What is the pathophysiology of salicylate toxicity?

The principal pathophysiologic effect of toxic doses of salicylates are characterized by (1) stimulation of the respiratory center of the brain, leading to hyperpnea and respiratory alkalosis; (2) uncoupling of oxidative phosphorylation, leading to increased oxygen utilization and glucose demand, increased oxygen …

What is salicylate intoxication?

Salicylate poisoning, also known as aspirin poisoning, is the acute or chronic poisoning with a salicylate such as aspirin. The classic symptoms are ringing in the ears, nausea, abdominal pain, and a fast breathing rate. Early on, these may be subtle, while larger doses may result in fever.

What is the meaning of pharmacodynamic?

Pharmacodynamics is the study of a drug’s molecular, biochemical, and physiologic effects or actions. It comes from the Greek words “pharmakon,” meaning “drug,” and “dynamikos,” meaning “power.”

Why is salicylic acid not used in place of aspirin?

Salicylic acid itself causes tissue damage in high concentrations. In the stomach it can exacerbate conditions like ulcers. Aspirin is a modified form that is less damaging to the stomach lining. But there’s a catch.

Is salicylic acid more acidic than aspirin?

Salicylic acid has ortho -OH, while aspirin has ortho -OCOCH3. -OH is more pi-electron-donating than -OCOCH3. This would make salicylate the weaker conjugate base, and therefore salicylic acid is the stronger acid. Apparently this effect is stronger than the effect of pi electron donation.

How is aspirin hydrolysed to salicyclic acid in the body?

The aspirin hydrolyzed in the presence of aqeuous acid and stomach esterases (which act as catalysts) to salicyclic acid (active form of the drug) and acetic acid. Salicylate activates central chemoreceptors in the brainstem to cue hyperventilation.

How does aspirin react with acid?

Carboxylic acid consists of a carbonyl group (CO) and a hydroxyl group (OH). It’s also referred to as the R-COOH group.

  • Ester consists of a carbonyl group (CO) bound to an oxygen group.
  • The aromatic group (benzene) is the ring you see in aspirin.