Cyanide Detoxification
Cyanide Detoxification - Related Videos
01:20
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions
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2023
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
03:45
Formation of Complex Ions
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2020
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
04:08
Determining the pH of Salt Solutions
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2020
The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution. In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than 7. For...
11:56
A Rapid and Specific Microplate Assay for the Determination of Intra- and Extracellular Ascorbate in Cultured Cells
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Cited by 4 •
2014
Ascorbate plays numerous important roles in cellular metabolism, many of which have only come to light in recent years. Here we describe a medium-throughput, specific and inexpensive microplate assay for the determination of both intra- and extracellular ascorbate in cell culture.
03:27
Mixtures of Acids
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2020
The pH of a solution containing an acid can be determined using its acid dissociation constant and its initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending upon the relative strength of the acids and their dissociation constants. A Mixture of a Strong Acid and a Weak Acid In a mixture of a strong acid and a weak acid, the strong acid dissociates completely and becomes a source of almost all the hydronium ions...
FAQs
The critical injury occurs when cyanide inhibits mitochondrial cytochrome c oxidase, disrupting the cellular respiration process that supports energy production. Detoxification therefore aims to act before this inhibition causes extensive physiological impairment. This mechanism explains why clinical toxicology emphasizes rapid recognition, prompt antidote selection, and supportive treatment rather than relying solely on the body’s natural clearance pathways.
Rhodanese detoxifies cyanide by transferring sulfur to it and producing thiocyanate, a form that can be eliminated in urine. However, the enzyme’s capacity depends on available sulfur donors. When sulfur is limited, this pathway cannot increase detoxification indefinitely, which provides the mechanistic rationale for using sodium thiosulfate to support conversion during clinical management.
Hydroxocobalamin acts by binding cyanide and forming cyanocobalamin, while sodium thiosulfate supplies sulfur that supports rhodanese-mediated conversion of cyanide into thiocyanate. These mechanisms address toxicity differently: one sequesters cyanide, whereas the other facilitates its biochemical transformation. Understanding that distinction helps clinicians relate antidote choice to the available detoxification pathways.
The principal limitation is the availability of sulfur donors for rhodanese. Although the enzyme can convert cyanide into thiocyanate, insufficient sulfur restricts the rate and extent of that reaction. This constraint means that natural detoxification may not adequately address substantial exposure, making externally supplied antidotal support relevant in emergency medicine and clinical toxicology.
Clinical antidote selection is guided by whether treatment should bind cyanide directly or support its enzymatic conversion. Hydroxocobalamin provides the binding approach by forming cyanocobalamin, while sodium thiosulfate supports thiocyanate production. Linking the treatment mechanism to cyanide’s inhibition of cellular respiration helps clinicians prioritize rapid intervention alongside supportive treatment and risk assessment.
Hydroxocobalamin converts cyanide into cyanocobalamin through binding, whereas sodium thiosulfate supports formation of thiocyanate for urinary excretion. These outcomes show how treatment can reduce the pool of biologically active cyanide through sequestration or elimination. In clinical toxicology, that distinction helps frame expectations for antidotal action and the need for continued supportive care.