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Related Concept Videos

Depolarizing Blockers: Pharmocokinetics01:19

Depolarizing Blockers: Pharmocokinetics

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Depolarizing blockers are administered through intravenous injection. Succinylcholine is the most common choice of depolarizing blockers in emergency clinical practices. Although they have a rapid onset, they readily diffuse away from the motor end plate into the extracellular fluid. They are metabolized by enzymes such as liver butyrylcholinesterase and plasma pseudocholinesterases. This produces a short duration of action, typically 5-10 minutes long, unlike nondepolarizing blockers, which...
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Certain drugs can affect how neurotransmitters called catecholamines, are released or taken back up in the adrenergic neuron. They can have different effects on the body's sympathetic transmission. Reserpine, a natural compound found in the Rauwolfia shrub, blocks a transporter called vesicular monoamine transporter (VMAT), which leads to a buildup of catecholamines in the cell and reduces sympathetic transmission. Another drug called guanethidine works in multiple ways, including blocking...
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Cholinergic Antagonists: Chemistry and Structure-Activity Relationship01:29

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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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Depolarizing Blockers: Mechanism of Action01:28

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Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
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Skeletal Muscle Relaxants: Adverse Effects01:21

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Skeletal muscle relaxants are widely used for muscle paralysis and relieving pain following any muscle injury or stiffness. However, depending on the drug type, they can have adverse effects that range from mild to severe. Usually, nondepolarizing neuromuscular blockers have minimal side effects. For example, drugs like d-tubocurarine, cisatracurium, and rocuronium cause hypotension, whereas drugs like baclofen, when stopped abruptly, can lead to the recurrence of spastic conditions.
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Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

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Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
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A New Succinate Derivative from Ajuga decumbens.

Gai-Xia Fan, De-Juan Zhi, Hui Ren

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    A new succinate derivative was identified in Ajuga decumbens. This study also reports known compounds, advancing the understanding of this plant's chemical constituents.

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    Area of Science:

    • Natural Product Chemistry
    • Phytochemistry
    • Organic Chemistry

    Background:

    • Ajuga decumbens Thunb. is a plant with a history of traditional use.
    • Understanding the chemical profile of medicinal plants is crucial for discovering new bioactive compounds.

    Purpose of the Study:

    • To isolate and characterize compounds from the whole plants of Ajuga decumbens.
    • To identify novel chemical entities and known compounds from this species.

    Main Methods:

    • Extraction and isolation of compounds from plant material.
    • Structure elucidation using spectroscopic techniques (1D and 2D NMR).
    • High-resolution electrospray ionization mass spectrometry (HR-ESI-MS) analysis.

    Main Results:

    • A new succinate derivative, ethyl (5-formylfuran-2-yl)methyl succinate (1), was isolated.
    • Three known compounds (2-4) were also identified.
    • Compounds 2 and 3 were reported from A. decumbens for the first time.

    Conclusions:

    • The phytochemical investigation of Ajuga decumbens led to the discovery of a new succinate derivative.
    • This study expands the knowledge of the chemical constituents of A. decumbens, with potential implications for further research.