Amide-linked Anesthetics
Amide-linked Anesthetics - Related Videos
01:29
Preparation of Amides
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2023
Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC). The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent. Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
01:19
Amines to Amides: Acylation of Amines
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2025
Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond. Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
01:28
Amides to Carboxylic Acids: Hydrolysis
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2023
Amides can undergo either acid-catalyzed hydrolysis or base-promoted hydrolysis through a typical nucleophilic acyl substitution. Each hydrolysis requires severe conditions. Acid-catalyzed hydrolysis: Hydrolysis of amides under acidic conditions yields carboxylic acids. Since the reaction occurs slowly, hydrolysis requires the conditions of heat. The mechanism begins with the protonation of the carbonyl oxygen by the acid catalyst. The protonation makes the amide carbonyl carbon more...
07:15
Amide Hydrogen/Deuterium Exchange & MALDI-TOF Mass Spectrometry Analysis of Pak2 Activation
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Cited by 2 •
2011
MALDI-TOF mass spectrometry was successfully utilized to monitor the amide hydrogen/deuterium exchange in protein kinase Pak2 activation.
02:04
Covalently Linked Protein Regulators
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2020
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified. These groups modify specific amino acids in a protein.
FAQs
The key pharmacologic effect is channel-state stabilization: binding favors voltage-gated sodium channels in their inactivated state, reducing the channels available to support rapid electrical signaling. As a result, an impulse cannot be initiated or propagated normally through the affected nerve. This mechanism explains interruption of pain transmission at the treated site.
Dose and local tissue conditions influence how much drug reaches neuronal membranes and how effectively sodium-channel activity is suppressed. These factors can therefore change the extent and duration of sensory interruption. Considering them is important when interpreting variable responses, because the same agent may not produce identical effects in every treatment setting.
Most amide-linked anesthetics undergo hepatic metabolism, so clearance affects how long the drug remains in systemic circulation. Reduced clearance or greater systemic exposure can increase the need for careful selection and monitoring. Drug-specific differences in clearance and duration help pharmacologists balance the intended local effect against the possibility of neurologic or cardiovascular toxicity.
These drugs can be administered topically, by local infiltration, through nerve blocks, or by epidural and spinal techniques. Each route places the anesthetic in a different anatomical context, allowing clinicians to target pain transmission at the surface, near a local site, or along relevant neural pathways. Route selection therefore connects pharmacology with the intended distribution of anesthesia.
Selection should account for the agent’s drug-specific duration, expected systemic exposure, and hepatic clearance rather than relying only on class membership. Lidocaine, bupivacaine, and ropivacaine are examples within the same structural class, but their differing pharmacologic characteristics can make one more suitable than another for a particular anesthetic approach or treatment duration.
The desired outcome is interruption of pain transmission through the treated neural pathway, using a route such as infiltration, nerve block, epidural, or spinal administration. Monitoring remains important because systemic exposure can produce neurologic or cardiovascular toxicity. Dose, tissue conditions, drug-specific duration, and hepatic clearance all help frame interpretation of both therapeutic effects and adverse findings.