chemistry

Tetramethylenedisulfotetramine

Tetramethylenedisulfotetramine is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Tetramethylenedisulfotetramine rather than just read about it. In short: Tetramethylenedisulfotetramine (TETS) is an organic compound used as a rodenticide (rat poison). It is an odorless, tasteless white powder that is slightly soluble in water, DMSO and acetone, and insoluble in methanol and ethanol.

Key takeaways

Tetramethylenedisulfotetramine belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Tetramethylenedisulfotetramine to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Tetramethylenedisulfotetramine from memory before moving on to harder problems.

Reference excerpt

Tetramethylenedisulfotetramine (TETS) is an organic compound used as a rodenticide (rat poison). It is an odorless, tasteless white powder that is slightly soluble in water, DMSO and acetone, and insoluble in methanol and ethanol. It is a sulfamide derivative. It can be synthesized by reacting sulfamide with formaldehyde solution in acidified water. When crystallized from acetone, it forms cubic crystals with a melting point of 255–260 °C.

Toxicity and mechanism TETS is a neurotoxin and convulsant, causing lethal convulsions. Its effect is similar to but stronger than picrotoxin, a GABA-A receptor antagonist widely used in research. As one of the most hazardous pesticides, it is 100 times more toxic than potassium cyanide. TETS binds to neuronal GABA gated chloride channels, often causing status epilepticus. No antidote is known. The lethal dose for humans is 7–10 mg. Poisoning is diagnosed by GC-MS and the treatment is mainly supportive, with large IV doses of a benzodiazepine (e.g clonazepam) and pyridoxine to control symptoms. TETS is sequestered in tissues of poisoned birds and can thus pose severe risk of secondary poisoning.

History Previous research has documented the effectiveness of tetramethylenedisulfotetramine against mice. The dangers of this chemical were first suspected in 1949. The U.S. Forest Service, looking to protect tree seeds for reforestation, noted its lethal effect against the rodent populations. Rather than repel wandering scavengers, the chemical was proved to be toxic to the local rodent population for up to 4 years. Continued experiments conducted by the U.S. Forest Service found no direct effect between TETS and the gastro-intestinal or renal systems of spinal dogs. In this same study, no effects were seen within the peripheral or skeletal nerve system, limiting symptoms of toxicity to the brain stem. Curtis and Johnson were the first to hypothesize TETS antagonistic behavior on GABA. An in-vitro study using superior cervical ganglion neurons of rats found TETS to antagonize the depolarization actions of GABA, while having no influence on the cholinomimetic agent carbachol. This evidence suggests that TETS may act as a non-competitive inhibitor for GABA. Further research findings using crustacean models, indicated a dose-dependent, non-competitive response to TETS that is reversible.

Research

In vitro and rapid screening tools Recent studies have indicated the usefulness of pH sensitivity in identifying Chloride ion influx, resulting from GABA-A receptor excitation. Other potential screening tools include spontaneous Calcium ion oscillations seen in hippocampal cell cultures from new born mice. This phenomenon can be measured by Calcium ion sensitive fluorescent dye. Further analyses showed that these Calcium ion oscillations are sensitive to MK-801 (an NMDA open channel blocker), suggesting that NMDA receptor operated channels are involved in TMDT induced spontaneous activity. When considering GABAA receptor activity, diazepam and pregnanolone reversed TMDT activity when applied to cell cultures individually and in combination. MK-801 and ketamine show more antagonistic effects on TMDT than diazepam within cerebral cortical cell cultures of embryonic rats.

In vivo mouse models Low dosages of ketamine and MK-801, administered separately, were associated with increased clonic seizures with no effect on tonic clonic seizures on mice exposed to TETS. Further analysis on the same sample of mice, found that dual administration of diazepine and MK-801 had a synergistic protective effect against tonic-clonic seizures and 24-hour lethality, as opposed to clonic seizures that were poorly controlled. Sequential administration diazepine and MK-801 for clonic control of seizures in TETS exposed mice, may indicate the benefits of benzodiazepine-NMDA receptor antagonist regimens used to treat TETS exposed patients.

Worldwide restriction Its use worldwide has been banned since 1984, but due to continuing demand and its ease of production, it is still readily, although illegally, available in China, until being formally banned in 2002. The best known Chinese rodenticide, containing about 6–20% TETS, is Dushuqiang, "very strong rat poison". It has been used for mass poisonings in China: in April 2004, there were 74 casualties after eating scallion-flavored pancakes tainted by their vendor's competitor; and in September 2002, 400 people were poisoned and 38 died from contaminated food. In 2002, there was one documented case of accidental poisoning in the US.

See also GABAA receptor negative allosteric modulator GABAA receptor § Ligands Strychnine Picrotoxin

References

Illustrations

Worked examples

Example 1 — a first encounter with Tetramethylenedisulfotetramine

Start with the simplest possible case. Write down what Tetramethylenedisulfotetramine claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Tetramethylenedisulfotetramine before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Tetramethylenedisulfotetramine ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Tetramethylenedisulfotetramine

In research: Tetramethylenedisulfotetramine appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Tetramethylenedisulfotetramine in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Tetramethylenedisulfotetramine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Adamantane-like molecules, Chloride channel blockers, Convulsants, so understanding it makes those chapters shorter.
In everyday life: Look for Tetramethylenedisulfotetramine outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Tetramethylenedisulfotetramine in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Tetramethylenedisulfotetramine means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
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Frequently asked questions

What is Tetramethylenedisulfotetramine in simple terms?

Why does Tetramethylenedisulfotetramine matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Tetramethylenedisulfotetramine?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Tetramethylenedisulfotetramine.