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Related Concept Videos

Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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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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Antifungal Agents01:15

Antifungal Agents

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Amphotericin B is a broad-spectrum antifungal agent that exploits structural differences between fungal and mammalian cell membranes. Its amphipathic structure—featuring a hydrophobic polyene-lactone ring and a hydrophilic region containing mycosamine and carboxylic acid groups—enables selective binding to ergosterol, a sterol predominantly found in fungal plasma membranes. This selective interaction underlies the drug’s antifungal activity, although weak binding to...
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Anthelminthic Agents01:15

Anthelminthic Agents

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Anthelmintic drugs differ significantly from antiparasitic therapies targeting protozoa, primarily due to differences in parasite biology. Whereas most protozoal treatments act on proliferating cells, anthelmintics are typically directed against mature, nonproliferative helminths. The therapeutic approach considers the helminth's reliance on neuromuscular coordination, glucose metabolism, and microtubular integrity for survival, reproduction, and localization within the host. Most anthelmintics...
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Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

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Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
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Basicity of Aromatic Amines01:18

Basicity of Aromatic Amines

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The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
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Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

3.5K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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Phenothiazinium photoantimicrobials with basic side chains.

Mark Wainwright1, Joanna Antczak1, Martyna Baca1

  • 1School of Pharmacy & Biomolecular Sciences, Liverpool John Moores University, Liverpool L3 3AF, United Kingdom.

Journal of Photochemistry and Photobiology. B, Biology
|January 19, 2015
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Summary
This summary is machine-generated.

New methylene blue derivatives show potent photobactericidal activity. One derivative with a unique structure offers high efficacy against bacteria and fungi with minimal dark toxicity, suggesting improved membrane targeting for antimicrobial applications.

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Area of Science:

  • Medicinal Chemistry
  • Photochemistry
  • Microbiology

Background:

  • Methylene blue is a standard cationic photosensitizer.
  • Developing novel photosensitizers with enhanced antimicrobial properties is crucial.

Purpose of the Study:

  • Synthesize and evaluate novel methylene blue derivatives with additional amino functionality.
  • Assess the photodynamic and photobactericidal activity of these derivatives.
  • Investigate the structure-activity relationship, focusing on charge distribution and lipophilicity.

Main Methods:

  • Synthesis of methylene blue analogues with amino groups in the auxochromic side-chain.
  • In vitro photodynamic activity profiling.
  • Screening against Gram-positive and Gram-negative bacteria for photobactericidal activity.
  • Evaluation of dark toxicity.
  • Testing against additional pathogens, including Candida albicans.

Main Results:

  • Most derivatives showed improved photobactericidal activity compared to methylene blue.
  • One derivative exhibited high phototoxicity and low dark toxicity against a broad spectrum of pathogens.
  • This promising derivative possessed an asymmetrical structure with distinct lipophilic and hydrophilic regions.
  • Activity is potentially linked to efficient membrane targeting.

Conclusions:

  • Novel methylene blue derivatives can be designed for enhanced photobactericidal efficacy.
  • An asymmetrical structure promoting membrane targeting is key for potent antimicrobial photosensitizers.
  • This approach offers a promising strategy for developing new antimicrobial agents with reduced side effects.