Hypochlorous Acid (HOCl) as a Promising Respiratory Antiseptic

Michael Winter1, Dirk Boecker2, Wilfried Posch3

  • 1Team Winter Kompetenztraining, 1030 Vienna, Austria.

Viruses
|September 27, 2025
PubMed

Insights

Hypochlorous acid (HOCl), a natural immune agent, shows promise as a cost-effective antiseptic for respiratory infections. Its low cytotoxicity and broad efficacy suggest potential for treating viral and bacterial pathogens via inhalation.

Area of Science:

  • Medical Research
  • Infectious Diseases
  • Biochemistry

Background:

  • The COVID-19 pandemic highlighted the need for effective global health interventions.
  • Investigating new therapeutic mechanisms is complex, time-consuming, and costly.
  • Antiseptic treatments offer a cost-effective and accessible approach to infection control.

Purpose of the Study:

  • To explore the potential of hypochlorous acid (HOCl) as an in vivo antiseptic for respiratory tract infections.
  • To assess HOCl's suitability for therapeutic inhalation against various pathogens.
  • To discuss the mechanisms and efficacy of HOCl in combating respiratory illnesses.

Main Methods:

  • Literature review of existing research on hypochlorous acid (HOCl).
  • Analysis of HOCl's properties, including its natural occurrence, biocidal activity, and cytotoxicity.
  • Examination of HOCl's historical medical applications, particularly in wound care.
  • Evaluation of potential efficacy against respiratory pathogens like SARS-CoV-2, influenza, and RSV.

Main Results:

  • Hypochlorous acid (HOCl) is a naturally occurring component of the innate immune system.
  • HOCl exhibits broad-spectrum antimicrobial activity with low cytotoxicity.
  • Previous medical use in wound treatment demonstrates HOCl's safety and efficacy.
  • HOCl's properties suggest potential for treating respiratory mucosa infections.

Conclusions:

  • Hypochlorous acid (HOCl) presents a promising, accessible therapeutic option for respiratory infections.
  • Therapeutic inhalation of HOCl could be a viable strategy against bacterial and viral respiratory pathogens.
  • Further research into HOCl for respiratory applications is warranted given its favorable profile.

Related Concept Videos

Hand hygiene01:23

Hand hygiene

Asepsis is the practice of preventing or breaking the chain of infection. The nurse employs aseptic techniques to prevent the spread of microorganisms and reduce the risk of diseases. Hand hygiene is the cornerstone of aseptic techniques and is classified into medical and surgical asepsis. Medical asepsis includes hand hygiene and the use of gloves. Surgical asepsis, or the sterile technique, refers to practices that render and keep objects and areas free of microorganisms.
Hand washing...
5.4K
Chemical Agents for Microbial Control01:27

Chemical Agents for Microbial Control

Chemicals play important roles in controlling microbial growth by targeting microbial structures and functions as sanitizers, antiseptics, disinfectants, and sterilants.Alcohols are commonly used sanitizers, effectively disrupting lipid membranes, which compromises cell integrity. They are also used as antiseptics and disinfectants due to their rapid action and versatility.Phenols and their derivatives phenolics , known for denaturing proteins and disrupting cell membranes, are particularly...
699
Carboxylic Acids to Acid Chlorides01:18

Carboxylic Acids to Acid Chlorides

Carboxylic acids react with SOCl2 or PCl5 to form acid chlorides. Amongst the carboxylic acid derivatives, acid chlorides are the most reactive and synthetically important derivatives. They are useful reagents for Friedel–Crafts acylation of some aromatic compounds.
8.6K
Mixtures of Acids03:27

Mixtures of Acids

The pH of a solution containing an acid can be determined using its acid dissociation constant and its initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending upon the relative strength of the acids and their dissociation constants.
A Mixture of a Strong Acid and a Weak Acid
In a mixture of a strong acid and a weak acid, the strong acid dissociates completely and becomes a source of almost all the hydronium ions...
21.4K
Acute Respiratory Failure-V01:29

Acute Respiratory Failure-V

The treatment for acute respiratory failure varies based on factors like the underlying cause, overall health, and severity. A collaborative healthcare team is essential for early detection, often through arterial blood gas analysis. Identifying the cause is the primary goal, with treatment strategies adjusted for ventilation/perfusion (V/Q) mismatch, shunting, or diffusion impairment.
Ensure that patients are monitored continuously for their response to therapy, including changes in...
407
Surface Membrane Barriers01:18

Surface Membrane Barriers

The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
2.5K