chemistry

N-Methylphenethylamine

N-Methylphenethylamine 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 N-Methylphenethylamine rather than just read about it. In short: N-Methylphenethylamine (NMPEA) is a naturally occurring trace amine neuromodulator in humans that is derived from the trace amine, phenethylamine (PEA). It has been detected in human urine (<1 μg over 24 hours) and is produced by phenylethanolamine N-methyltransferase with phenethylamine as a substrate, which significantly increases PEA's effects.

Key takeaways

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

Reference excerpt

N-Methylphenethylamine (NMPEA) is a naturally occurring trace amine neuromodulator in humans that is derived from the trace amine, phenethylamine (PEA). It has been detected in human urine (<1 μg over 24 hours) and is produced by phenylethanolamine N-methyltransferase with phenethylamine as a substrate, which significantly increases PEA's effects. PEA breaks down into phenylacetaldehyde which is further broken down into phenylacetic acid by monoamine oxidase. When this is inhibited by monoamine oxidase inhibitors, it allows more of the PEA to remain present and produce psychoactive effects. PEA and NMPEA are both alkaloids that are found in a number of different plant species as well. Some Acacia species, such as A. rigidula, contain remarkably high levels of NMPEA (~2300–5300 ppm). NMPEA is also present at low concentrations (< 10 ppm) in a wide range of foodstuffs. NMPEA is a positional isomer of amphetamine.

Biosynthesis

Chemistry In appearance, NMPEA is a colorless liquid. NMPEA is a weak base, with pKa = 10.14; pKb = 3.86 (calculated from data given as Kb). It forms a hydrochloride salt, m.p. 162–164 °C. Although NMPEA is available commercially, it may be synthesized by various methods. An early synthesis reported by Carothers and co-workers involved conversion of phenethylamine to its p-toluenesulfonamide, followed by N-methylation using methyl iodide, then hydrolysis of the sulfonamide. A more recent method, similar in principle, and used for making NMPEA radio-labeled with 14C in the N-methyl group, started with the conversion of phenethylamine to its trifluoroacetamide. This was N-methylated (in this particular case using 14C – labeled methyl iodide), and then the amide hydrolyzed. NMPEA is a substrate for both MAO-A (KM = 58.8 μM) and MAO-B (KM = 4.13 μM) from rat brain mitochondria.

Pharmacology NMPEA is a pressor, with 1/350 x the potency of epinephrine. Like its parent compound, PEA, and isomer, amphetamine, NMPEA is a potent agonist of human trace amine-associated receptor 1 (hTAAR1). It has comparable pharmacodynamic and toxicodynamic properties to that of phenethylamine, amphetamine, and other methylphenethylamines in rats. As with PEA, NMPEA is metabolized relatively rapidly by monoamine oxidases during first pass metabolism; both compounds are preferentially metabolized by MAO-B.

Toxicology The "minimum lethal dose" (mouse, i.p.) of the HCl salt of NMPEA is 203 mg/kg; the LD50 for oral administration to mice of the same salt is 685 mg/kg. Acute toxicity studies on NMPEA show an LD50 = 90 mg/kg, after intravenous administration to mice.

References

Illustrations

Worked examples

Example 1 — a first encounter with N-Methylphenethylamine

Start with the simplest possible case. Write down what N-Methylphenethylamine 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 N-Methylphenethylamine 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 N-Methylphenethylamine 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 N-Methylphenethylamine

In research: N-Methylphenethylamine 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 N-Methylphenethylamine 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: N-Methylphenethylamine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Amino acid derivatives, Amphetamine, Norepinephrine-dopamine releasing agents, so understanding it makes those chapters shorter.
In everyday life: Look for N-Methylphenethylamine 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 N-Methylphenethylamine in 20 minutes

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

Frequently asked questions

What is N-Methylphenethylamine in simple terms?

Why does N-Methylphenethylamine 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 N-Methylphenethylamine?

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 N-Methylphenethylamine.