chemistry

Gramine

Gramine 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 Gramine rather than just read about it. In short: Gramine (also called donaxine) is a naturally occurring indole alkaloid present in several plant species. Gramine may play a defensive role in these plants, since it is toxic to many organisms.

Key takeaways

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

Reference excerpt

Gramine (also called donaxine) is a naturally occurring indole alkaloid present in several plant species. Gramine may play a defensive role in these plants, since it is toxic to many organisms.

Occurrence Gramine has been found in the giant reed, Arundo donax, Acer saccharinum (Silver Maple), Hordeum, (a grass genus that includes barley) and Phalaris (another grass genus).

Effects and toxicity Gramine is a close analogue of the psychedelic drug dimethyltryptamine (DMT), but its side chain has one less carbon atom in comparison. In contrast to DMT, gramine does not have significant psychedelic-like behavioral effects in animals. The same is true of 5-methoxygramine (5-MeO-gramine), which failed to substitute for DOM in rodent drug discrimination tests. The N,N-didesmethyl analogue of gramine, indolemethylamine (3-aminomethylindole), showed 71-fold reduced potency as a serotonin receptor agonist compared to tryptamine in the rat stomach strip. Gramine has been found to act as an agonist of the adiponectin receptor 1 (AdipoR1). The LD50 of gramine is 44.6 mg/ kg iv in mice and 62.9 mg/ kg iv in rats. Numerous studies have been done on the toxicity of gramine and tryptamines to insects harmful to crops in order to assess their potential use as an insecticide. Recent toxicity evaluations show Gramine to be relatively low toxicity in humans, and to have anti-mutagenic and potential neuroprotective action, as a widely found alkaloid present in oats and barley.

See also Dimethyltryptamine (DMT) Dimethylhomotryptamine (DMHT)

References

Illustrations

Worked examples

Example 1 — a first encounter with Gramine

Start with the simplest possible case. Write down what Gramine 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 Gramine 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 Gramine 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 Gramine

In research: Gramine 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 Gramine 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: Gramine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Adiponectin receptor agonists, Dimethylamino compounds, Indole alkaloids, so understanding it makes those chapters shorter.
In everyday life: Look for Gramine 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 Gramine in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Gramine 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.
Explain Gramine out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Gramine in simple terms?

Gramine (also called donaxine) is a naturally occurring indole alkaloid present in several plant species. Gramine may play a defensive role in these plants, since it is toxic to many organisms.

Why does Gramine 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 Gramine?

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 Gramine.