Target | Antiseptic or disinfectant | Mechanism of action |
---|---|---|
Cell envelope (cell wall, outer membrane) | Glutaraldehyde | Cross-linking of proteins |
EDTA, other permeabilizers | Gram-negative bacteria: removal of Mg2+, release of some LPS | |
Cytoplasmic (inner) membrane | QACs | Generalized membrane damage involving phospholipid bilayers |
Chlorhexidine | Low concentrations affect membrane integrity, high concentrations cause congealing of cytoplasm | |
Diamines | Induction of leakage of amino acids | |
PHMB, alexidine | Phase separation and domain formation of membrane lipids | |
Phenols | Leakage; some cause uncoupling | |
Cross-linking of macromolecules | Formaldehyde | Cross-linking of proteins, RNA, and DNA |
Glutaraldehyde | Cross-linking of proteins in cell envelope and elsewhere in the cell | |
DNA intercalation | Acridines | Intercalation of an acridine molecule between two layers of base pairs in DNA |
Interaction with thiol groups | Silver compounds | Membrane-bound enzymes (interaction with thiol groups) |
Effects on DNA | Halogens | Inhibition of DNA synthesis |
Hydrogen peroxide, silver ions | DNA strand breakage | |
Oxidizing agents | Halogens | Oxidation of thiol groups to disulfides, sulfoxides, or disulfoxides |
Peroxygens | Hydrogen peroxide: activity due to from formation of free hydroxy radicals (·OH), which oxidize thiol groups in enzymes and proteins; PAA: disruption of thiol groups in proteins and enzymes |
вторник, 21 ноября 2017 г.
Summary of mechanisms of antibacterial action of antiseptics and disinfectants
вторник, 14 ноября 2017 г.
понедельник, 6 ноября 2017 г.
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