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Related Concept Videos

Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

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.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of the aromatic...
Adrenergic Neurons: Neurotransmission01:27

Adrenergic Neurons: Neurotransmission

Postganglionic sympathetic fibers (except those supplying the sweat glands) releasing noradrenaline or norepinephrine are called noradrenergic or adrenergic neurons. Noradrenaline, dopamine, adrenaline, or epinephrine are collectively called "catecholamines" as they contain a catechol moiety and an amine side chain. The five stages of neurotransmitter release involve their synthesis, storage, release, reuptake and metabolism.
Synthesis: Catecholamine synthesis requires tyrosine, which is taken...
Adrenergic Agonists: Mixed-Action Agents01:28

Adrenergic Agonists: Mixed-Action Agents

Mixed-action adrenergic agonists, like ephedrine and pseudoephedrine, directly and indirectly affect adrenergic receptors. These agents stimulate adrenoceptors and indirectly release stored neurotransmitters, amplifying the adrenergic response.
Ephedrine and pseudoephedrine lack a catecholamine group, making them less susceptible to degradation by metabolic enzymes. They have increased oral bioavailability and lipophilicity, resulting in a longer duration of action. Their response is reduced by...
Adrenergic Agonists: Direct-Acting Agents01:30

Adrenergic Agonists: Direct-Acting Agents

Drugs that mimic the action of endogenous catecholamines like noradrenaline and adrenaline are called adrenergic agonists or sympathomimetics. Based on their mechanism of action, sympathomimetics can be classified as direct-, indirect-, or mixed-acting sympathomimetics. Direct-acting adrenergic agonists activate adrenoceptors without affecting presynaptic neurons, making them independent of neuronal catecholamine-depleting agents like reserpine and guanethidine.
These agents can be classified...
Adrenergic Receptors: ɑ Subtype01:31

Adrenergic Receptors: ɑ Subtype

Adrenoceptors are classified into α and ꞵ classes based on their potencies to catecholamine agonists. α-adrenoceptors show the following order of catecholamine potency:
Adrenaline ≥ Noradrenaline >> Isoprenaline
α-adrenoceptors are further divided into α1 and α2-adrenoceptors.
α1-Adrenoceptors: These receptors are located postsynaptically on the effector organs and cause constriction of smooth muscle mediated by activation of phospholipase C—inositol-1,4,5-trisphosphate...
Adrenergic Antagonists: Chemistry and Classification of ɑ-Receptor Blockers01:17

Adrenergic Antagonists: Chemistry and Classification of ɑ-Receptor Blockers

Adrenergic antagonists, or sympatholytics, inhibit adrenoceptor activation driven by catecholamines or agonists. Based on their adrenoceptor specificity, adrenergic blockers can be categorized into two primary groups: α-adrenergic blockers (α-blockers) and β-adrenergic blockers (β-blockers). α-blockers interact with α1 and α2 subtypes of α-adrenoceptors.
Nonselective α-blockers: Nonselective α-blockers contain haloalkylamine or imidazoline moieties. Phenoxybenzamine, with a haloalkylamine...

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Related Experiment Video

Updated: Jun 20, 2026

A Convenient Method for Extraction and Analysis with High-Pressure Liquid Chromatography of Catecholamine Neurotransmitters and Their Metabolites
13:35

A Convenient Method for Extraction and Analysis with High-Pressure Liquid Chromatography of Catecholamine Neurotransmitters and Their Metabolites

Published on: March 1, 2018

Norepinephrine: material-independent, multifunctional surface modification reagent.

Sung Min Kang1, Junsung Rho, Insung S Choi

  • 1Department of Chemistry, KAIST Institute for BioCentury & NanoCentury, 335 Science Road, Daejeon 305-701, Korea.

Journal of the American Chemical Society
|September 1, 2009
PubMed
Summary
This summary is machine-generated.

Norepinephrine polymerization creates universal surface coatings on diverse materials. This facile method enables secondary functionalization for advanced material applications.

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Time-Resolved In Vivo Measurement of Neuropeptide Dynamics by Capacitive Immunoprobe in Porcine Heart
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Time-Resolved In Vivo Measurement of Neuropeptide Dynamics by Capacitive Immunoprobe in Porcine Heart

Published on: May 19, 2022

Related Experiment Videos

Last Updated: Jun 20, 2026

A Convenient Method for Extraction and Analysis with High-Pressure Liquid Chromatography of Catecholamine Neurotransmitters and Their Metabolites
13:35

A Convenient Method for Extraction and Analysis with High-Pressure Liquid Chromatography of Catecholamine Neurotransmitters and Their Metabolites

Published on: March 1, 2018

Time-Resolved In Vivo Measurement of Neuropeptide Dynamics by Capacitive Immunoprobe in Porcine Heart
08:20

Time-Resolved In Vivo Measurement of Neuropeptide Dynamics by Capacitive Immunoprobe in Porcine Heart

Published on: May 19, 2022

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Chemistry

Background:

  • Surface modification is crucial for tailoring material properties.
  • Existing methods often lack universality across different material types.
  • Developing a single, adaptable surface modification strategy is highly desirable.

Purpose of the Study:

  • To investigate a material-independent surface modification approach using norepinephrine.
  • To demonstrate the versatility of the proposed method on various substrates.
  • To showcase secondary functionalization capabilities of the resulting polymer films.

Main Methods:

  • Utilizing pH-induced oxidative polymerization of norepinephrine.
  • Applying the polymerization process to a wide range of materials including noble metals, metal oxides, semiconductors, ceramics, shape-memory alloys, and synthetic polymers.
  • Performing secondary functionalization by immobilizing proteins and growing biodegradable polyester.

Main Results:

  • Formation of adherent poly(norepinephrine) films on diverse material surfaces.
  • Demonstration of successful secondary biochemical functionalizations.
  • Achieved material-independent surface modification through a facile polymerization process.

Conclusions:

  • Norepinephrine polymerization offers a universal and facile method for surface modification.
  • The poly(norepinephrine) films serve as a versatile platform for further biochemical functionalization.
  • This approach has broad implications for advanced materials and surface engineering.