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Related Concept Videos

Phase II Reactions: Miscellaneous Conjugation Reactions01:19

Phase II Reactions: Miscellaneous Conjugation Reactions

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Phase II biotransformations are detoxification mechanisms that conjugate xenobiotics with endogenous substances, neutralizing their toxicity.
A key example involves the conjugation of cyanide ions, which impair cellular respiration and alter hemoglobin into non-oxygen-carrying cyanmethemoglobin. To neutralize this threat, a sulfur atom from thiosulphate is transferred to the cyanide ion, catalyzed by the enzyme rhodanese, resulting in an inactive compound called thiocyanate. The production of...
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Enhanced Elimination of Poison01:26

Enhanced Elimination of Poison

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Poison can be effectively removed from the gastrointestinal (GI) tract through various decontamination procedures.
Antidotes serve a crucial role in counteracting the effects of poison by inhibiting enzymes responsible for producing harmful drug metabolites. In some cases, these toxic metabolites can be neutralized by endogenous cosubstrates, which are maintained at specific concentrations to prevent interaction with cellular macromolecules and subsequent cell death.
Renal excretion is the...
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Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism01:10

Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism

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Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide anion...
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Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview01:32

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

2.9K
Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction...
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Phase II Reactions: Glutathione Conjugation and Mercapturic Acid Formation01:22

Phase II Reactions: Glutathione Conjugation and Mercapturic Acid Formation

285
Glutathione, a tripeptide made up of glutamate, cysteine, and glycine, is a critical player in the detoxification of drugs and xenobiotics via a process known as glutathione conjugation or mercapturic acid formation. This phase II biotransformation reaction involves the covalent binding of glutathione to a drug or its metabolite, enhancing the compound's water solubility and enabling its excretion.
Several distinctive characteristics distinguish glutathione conjugation from other phase II...
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Masking and Demasking Agents01:19

Masking and Demasking Agents

2.5K
EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
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Related Experiment Video

Updated: Aug 6, 2025

Intra-cardiac Side-Firing Light Catheter for Monitoring Cellular Metabolism using Transmural Absorbance Spectroscopy of Perfused Mammalian Hearts
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Methemoglobin-albumin clusters for cyanide detoxification.

Yuto Suzuki1, Kazuaki Taguchi1, Wataru Okamoto2

  • 1Faculty of Pharmacy, Keio University, Tokyo, Japan.

Toxicology and Applied Pharmacology
|March 19, 2023
PubMed
Summary

Methemoglobin-albumin clusters offer a safer and more effective treatment for cyanide poisoning than sodium nitrite. This novel antidote protects cells and improves survival rates in animal models.

Keywords:
AlbuminAntidoteCyanideCytochrome c oxidaseMethemoglobinPoisoning

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Area of Science:

  • Biochemistry
  • Toxicology
  • Nanomedicine

Background:

  • Sodium nitrite is a standard cyanide poisoning antidote but has significant safety and efficacy limitations.
  • Cyanide toxicity stems from inhibiting cytochrome c oxidase, crucial for cellular respiration.

Purpose of the Study:

  • To develop and evaluate methemoglobin-albumin clusters as a superior antidote for cyanide poisoning.
  • To compare the efficacy and safety of methemoglobin-albumin clusters against sodium nitrite.

Main Methods:

  • Synthesis of methemoglobin-albumin clusters with spectral and functional analyses.
  • In vitro cell studies assessing cytoprotective effects against cyanide.
  • In vivo experiments in mice to evaluate mortality, acidosis, organ function, and oxygen-carrying capacity.

Main Results:

  • Methemoglobin-albumin clusters demonstrated cyanide-binding properties comparable to methemoglobin alone.
  • Clusters effectively prevented cyanide-induced inhibition of cytochrome c oxidase, showing strong cytoprotection.
  • In mice, methemoglobin-albumin clusters significantly reduced mortality, alleviated metabolic acidosis, and preserved organ cytochrome c oxidase activity better than sodium nitrite.
  • Oxygen-carrying capacity was maintained in mice treated with clusters, unlike those treated with sodium nitrite.

Conclusions:

  • Methemoglobin-albumin clusters represent a promising, safer, and more effective antidote for cyanide poisoning.
  • This novel approach overcomes the limitations associated with traditional sodium nitrite treatment.