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Antimicrobial Effectiveness01:28

Antimicrobial Effectiveness

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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...
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
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Radical Chain-Growth Polymerization: Overview01:10

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Macrocyclic quaternary ammonium salts (MQAs) show high antimicrobial activity and better selectivity than their polymeric counterparts. These novel compounds offer a promising new avenue for developing antibacterial agents by effectively permeabilizing microbial cell membranes.

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Area of Science:

  • Medicinal Chemistry
  • Antimicrobial Drug Discovery
  • Polymer Chemistry

Background:

  • Membrane-lytic compounds, including antimicrobial peptides (AMPs) and synthetic mimics (SMAMPs), are promising candidates for new antimicrobial agents.
  • Despite nearly 30 years of research, SMAMPs face challenges hindering their clinical application.

Purpose of the Study:

  • To investigate macrocyclic quaternary ammonium salts (MQAs) as a novel class of antimicrobial agents.
  • To compare the antimicrobial activity and selectivity of MQAs with their known polymeric analogues (ionenes).

Main Methods:

  • Redirected step-growth polymerization using a high dilution principle to synthesize MQAs from precursors of known antimicrobial ionenes.
  • Antimicrobial assays and cytotoxicity studies to evaluate efficacy and safety.
  • Membrane-lytic experiments using large unilamellar liposomes (LUVs) and whole cells to understand the mechanism of action.

Main Results:

  • MQAs demonstrated high antimicrobial activity and superior selectivity compared to their polymeric ionene analogues.
  • Significant differences were observed in the adsorption onto LUVs and microbial surfaces between MQAs and ionenes.
  • Distinct differences in lipid bilayer permeabilization capabilities were noted between MQAs and ionenes.

Conclusions:

  • Macrocyclic quaternary ammonium salts (MQAs) represent a new class of promising antibacterial agents with enhanced selectivity.
  • MQAs exhibit distinct membrane-lytic properties compared to ionenes, suggesting a potentially improved mechanism of action for antimicrobial applications.