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Related Concept Videos

Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:22

Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

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Cholinergic agonists or cholinomimetics mimic the action of acetylcholine to stimulate the parasympathetic nervous system. They are categorized into direct-acting and indirect-acting agents. The direct-acting cholinergic drugs induce the parasympathetic response by directly binding to the muscarinic or nicotine receptors. In comparison, the indirect-acting cholinergic drugs prevent acetylcholine hydrolysis, indirectly contributing to the extended parasympathetic response.
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Cholinergic antagonists bind to cholinergic receptors and limit the effects of acetylcholine and other cholinergic agonists. Based on the specific cholinergic receptor affinity, these antagonists are classified as muscarinic or nicotinic. Anticholinergics interrupt parasympathetic innervations while sympathetic innervations remain uninterrupted. Muscarinic antagonists are also called 'muscarinic antagonists', 'antimuscarinics', or 'parasympatholytics'. Nicotinic...
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Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:29

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Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
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Structure-Activity Relationships and Drug Design01:28

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Drug design is a dynamic field that involves discovering and developing new medications based on specific biological targets. This process heavily relies on structure-activity relationships (SAR) and quantitative structure-activity relationships (QSAR) to guide the design and optimization of efficient drugs.
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Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

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Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
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Local Anesthetics: Chemistry and Structure-Activity Relationship01:27

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Local anesthetics (LAs) are drugs that induce a temporary loss of sensation in a limited body area, preventing pain. Cocaine was the first local anesthetic discovered in the late 19th century. Cocaine is a benzoic acid ester obtained from the leaves of coca shrubs and was often used for its psychotropic effects. Cocaine was first isolated in 1860 by Albert Niemann. Sigmund Freud studied the physiological actions of cocaine. Carl Koller later introduced it into clinical practice in 1884 as a...
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The Antimicrobial and Cytotoxicity Properties of New Dibrominated 1,3-Dithiolium Flavonoids.

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Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade
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Novel Dithiocarbamic Flavanones with Antioxidant Properties-A Structure-Activity Relationship Study.

Mihail Lucian Birsa1, Laura Gabriela Sarbu1

  • 1Department of Chemistry, Alexandru Ioan Cuza University of Iasi, 11 Carol I Blvd., 700506 Iasi, Romania.

International Journal of Molecular Sciences
|January 8, 2025
PubMed
Summary
This summary is machine-generated.

This study explored halogenated flavanones for antioxidant potential. Fluorine-substituted flavanones showed superior radical scavenging activity compared to ascorbic acid and BHT.

Keywords:
antioxidantsbenzopyransbenzylic radicaldithiocarbamatesflavanonesradical enolates

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Area of Science:

  • Medicinal Chemistry
  • Organic Chemistry
  • Biochemistry

Background:

  • Flavanones are a class of flavonoids with known biological activities.
  • Previous research identified 3-dithiocarbamic flavanone frameworks with promising antioxidant properties.

Purpose of the Study:

  • To investigate the structure-activity relationship of 3-dithiocarbamic flavanones.
  • To evaluate the impact of para-position substituents on radical scavenging activity.

Main Methods:

  • Synthesis of flavanone derivatives with varying para-position substituents (H, F, Cl, Br, I).
  • Assessment of antioxidant activity using DPPH, ABTS, and FRAP assays.
  • Correlation analysis between substituent properties and radical scavenging efficacy.

Main Results:

  • Halogen substituents significantly enhanced antioxidant properties compared to unsubstituted flavanones.
  • The order of radical scavenging activity was F > Cl > Br > I > H.
  • Enhanced activity correlated with increased electronegativity and electron-withdrawing inductive effects of halogens.

Conclusions:

  • Halogenated 3-dithiocarbamic flavanones are potent antioxidants.
  • Electronegativity and inductive effects of substituents are key determinants of antioxidant activity.
  • These findings suggest potential for developing novel antioxidant agents based on flavanone scaffolds.