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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...
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The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
Weak Acid Solutions04:02

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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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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...
Mixtures of Acids01:19

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The pH of a solution containing an acid can be determined using its acid dissociation constant and initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending on the relative strength of the acids and their dissociation constants.
In a strong and weak acid mixture, the strong acid dissociates completely and becomes a source of almost all the hydronium ions present in the solution. In contrast, the weak acid shows...

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Microbicidal effect of weak acid hypochlorous solution on various microorganisms.

Tomoko Ono1, Koji Yamashita, Tomomi Murayama

  • 1Research and Technology Development Division, HSP company, 56-5 Ezaki, Okayama-shi, Okayama 702-8005, Japan. ono@hsp-net.co.jp

Biocontrol Science
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PubMed
Summary

Weak acid hypochlorous solutions demonstrate potent antimicrobial activity against diverse microbes. Their efficacy relies on hypochlorous acid concentration, not total chlorine, highlighting broad applicability in healthcare and food safety.

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Public Health

Background:

  • Antimicrobial resistance necessitates novel disinfection strategies.
  • Hypochlorous acid (HOCl) is a potent antimicrobial agent.
  • Weak acid formulations may enhance HOCl stability and efficacy.

Purpose of the Study:

  • To evaluate the in vitro microbicidal efficacy of weak acid hypochlorous solutions.
  • To determine the key factors influencing the antimicrobial activity of these solutions.
  • To assess the potential applications of weak acid hypochlorous solutions in high-risk environments.

Main Methods:

  • Preparation of weak acid hypochlorous solutions (pH 5.0-6.0) by mixing sodium hypochlorite (NaClO) and hydrochloric acid (HCl).
  • In vitro testing against a broad spectrum of bacteria, fungi, and viruses (standard strains and clinical isolates).
  • Quantification of microbicidal effects and correlation with available chlorine and hypochlorous acid concentrations.

Main Results:

  • The weak acid hypochlorous solutions exhibited excellent and rapid microbicidal effects against a wide range of microorganisms.
  • Antimicrobial efficacy was strongly correlated with hypochlorous acid (HClO) concentration, independent of total available chlorine.
  • No significant differences were observed in efficacy between standard strains and clinical isolates.

Conclusions:

  • Weak acid hypochlorous solutions possess broad-spectrum, rapid antimicrobial properties.
  • Hypochlorous acid concentration is the critical determinant of microbicidal activity.
  • These solutions show significant potential for disinfection in healthcare settings and the food industry.