Acetohydroxamic Acid (AHA) CAS 546-88-3 is a potent urease inhibitor widely recognized for its role in managing chronic urinary tract infections caused by urease-producing bacteria. Also known as N-Hydroxyacetamide or by its pharmaceutical trade name Lithostat, this compound helps prevent the formation and growth of infection-related kidney stones, particularly struvite (magnesium ammonium phosphate) stones.

Key Specifications

  • Chemical Name: Acetohydroxamic acid / N-Hydroxyacetamide
  • CAS Number: 546-88-3
  • Molecular Formula: C₂H₅NO₂
  • Molecular Weight: 75.07 g/mol
  • Appearance: White to off-white crystalline powder
  • Purity: Typically ≥98% (pharmaceutical/research grade available)
  • Synonyms: AHA, Acetylhydroxamic acid, Ethanehydroxamic acid

How Acetohydroxamic Acid Works

It functions as a specific, irreversible inhibitor of the enzyme urease, which is produced by certain bacteria (such as Proteus, Klebsiella, and Pseudomonas species) in the urinary tract. By blocking urease, it prevents the hydrolysis of urea into ammonia and carbon dioxide. This action reduces urinary ammonia levels, lowers alkaline pH caused by infection, and creates a less favorable environment for struvite stone formation and bacterial persistence.

Unlike antibiotics, acetohydroxamic acid has no direct antibacterial effect — it is used adjunctively with appropriate antibiotics or surgical intervention to control chronic urea-splitting infections and reduce stone recurrence.

Primary Applications

  • Treatment of chronic urea-splitting urinary tract infections
  • Prevention and management of struvite and staghorn calculi (infection stones)
  • Adjunct therapy in patients with persistent urinary alkalinity due to urease-positive bacteria
  • Research applications as a urease inhibitor in biochemical and microbiological studies

Acetohydroxamic acid is especially valuable in cases where long-term control of infection-related stone formation is needed and standard treatments alone are insufficient.

Benefits

  • Effectively reduces urinary ammonia and pH to inhibit struvite crystal growth
  • Helps dissolve or prevent enlargement of existing infection stones
  • Supports antibiotic efficacy in difficult-to-treat chronic UTIs
  • Well-established mechanism as a competitive urease inhibitor

Frequently Asked Questions (FAQs)

What is Acetohydroxamic acid mainly used for?

It is primarily used as an adjunct treatment for chronic urinary tract infections caused by urease-producing bacteria, helping to prevent struvite stone formation by inhibiting urease enzyme activity.

How does Acetohydroxamic acid differ from antibiotics?

It does not kill bacteria directly. Instead, it neutralizes the harmful effects of bacterial urease (ammonia production and alkalinity), making the urinary environment less supportive of infection and stone growth. It is typically combined with antibiotics.

Is Acetohydroxamic acid effective against all kidney stones?

No, it is specifically effective against infection-induced struvite stones caused by urease-positive bacteria. It is not indicated for other stone types (e.g., calcium oxalate or uric acid stones) unless infection is also present.

What is the chemical structure similarity to urea?

Acetohydroxamic acid is structurally similar to urea but includes a hydroxy group that allows it to bind irreversibly to urease, preventing the enzyme from breaking down real urea.

Is high-purity Acetohydroxamic acid available for research or pharmaceutical use?

Yes, high-purity grades (≥98%) are commonly supplied for pharmaceutical development, biochemical research, and urease inhibition studies.

Can Acetohydroxamic acid be used in non-medical applications?

While its primary use is medical, it also serves as a research tool in enzymology, microbiology, and as a building block in certain chemical syntheses.

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