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Carboxylic Acid Derivatives: Overview01:15

Carboxylic Acid Derivatives: Overview

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Carboxylic acid derivatives are formed by replacing the hydroxyl group of carboxylic acids with a different functional group. The most common carboxylic acid derivatives are:
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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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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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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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Structure of Carboxylic Acid Derivatives
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Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade
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Recent Advances on 3-Hydroxyflavone Derivatives: Structures and Properties.

Burcu Butun1, Gulacti Topcu2, Turan Ozturk1

  • 1Department of Chemistry, Faculty of Science and Letters, Istanbul Technical University, Istanbul. Turkey.

Mini Reviews in Medicinal Chemistry
|April 27, 2017
PubMed
Summary

Flavonoids, particularly flavonols, exhibit potent antioxidant and fluorescent properties due to their conjugated structures. These characteristics enable their use as food preservatives and therapeutic imaging agents.

Keywords:
3-hydroxyflavonesFlavonoidsdyeflavonolsfluorescentpharmacological activities

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Area of Science:

  • Natural Products Chemistry
  • Pharmacology
  • Biochemistry

Background:

  • Flavonoids are diverse phenolic compounds with varied chemical structures.
  • Flavonols, a subclass, possess a unique 3-hydroxyflavone structure.
  • This structure offers extensive electron conjugation and chelating abilities.

Purpose of the Study:

  • To highlight the structural features of flavonols.
  • To explain the basis of their pharmacological activities.
  • To underscore their potential applications.

Main Methods:

  • Chemical structure analysis of flavonoids.
  • Correlation of structure with biological activity.
  • Investigation of electron conjugation and fluorescence.

Main Results:

  • Flavonols possess the most electron-conjugated skeleton in the flavonoid family.
  • This conjugation underlies their antioxidant, antiviral, antitumor, and anti-inflammatory activities.
  • Strong electron conjugation also imparts fluorescence, useful for imaging.

Conclusions:

  • Flavonols demonstrate significant pharmacological potential due to their unique structure.
  • Their antioxidant properties make them valuable as food preservatives.
  • The fluorescent nature of flavonols opens avenues for therapeutic imaging applications.