chemistry

Tyramine

Tyramine 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 Tyramine rather than just read about it. In short: Tyramine ( TY-rə-meen) (also spelled tyramin), also known under several other names, is a naturally occurring trace amine derived from the amino acid tyrosine. Tyramine acts as a catecholamine releasing agent.

Key takeaways

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

Reference excerpt

Tyramine ( TY-rə-meen) (also spelled tyramin), also known under several other names, is a naturally occurring trace amine derived from the amino acid tyrosine. Tyramine acts as a catecholamine releasing agent. Notably, it is unable to cross the blood-brain barrier, resulting in only non-psychoactive peripheral sympathomimetic effects following ingestion. A hypertensive crisis can result, however, from ingestion of tyramine-rich foods in conjunction with the use of monoamine oxidase inhibitors (MAOIs).

Occurrence Tyramine occurs widely in plants and animals, and is metabolized by various enzymes, including monoamine oxidases. In foods, it often is produced by the decarboxylation of tyrosine during fermentation or decay. Foods that are fermented, cured, pickled, aged, or spoiled have high amounts of tyramine. Tyramine levels go up when foods are at room temperature or go past their freshness date. Specific foods containing considerable amounts of tyramine include:

Strong or aged cheeses: cheddar, Swiss, Parmesan, Stilton, Gorgonzola or blue cheeses, Camembert, feta, Muenster Meats that are cured, smoked, or processed: such as salami, pepperoni, dry sausages, hot dogs, bologna, bacon, corned beef, pickled or smoked fish, caviar, aged chicken livers, soups or gravies made from meat extract Pickled or fermented foods: sauerkraut, kimchi, tofu (especially stinky tofu), pickles, miso soup, bean curd, tempeh, sourdough breads Condiments: soy, shrimp, fish, miso, teriyaki, and bouillon-based sauces Drinks: beer (especially tap or home-brewed), vermouth, red wine, sherry, liqueurs Beans, vegetables, and fruits: fermented or pickled vegetables, overripe fruits Chocolate Scientists more and more consider tyramine in food as an aspect of safety. They propose projects of regulations aimed to enact control of biogenic amines in food by various strategies, including usage of proper fermentation starters, or preventing their decarboxylase activity. Some authors wrote that this has already given positive results, and tyramine content in food is now lower than it has been in the past.

In plants Mistletoe (toxic and not used by humans as a food, but historically used as a medicine).

In animals Tyramine also plays a role in animals including: In behavioral and motor functions in Caenorhabditis elegans; Locusta migratoria swarming behaviour; and various nervous roles in Rhipicephalus, Apis, Locusta, Periplaneta, Drosophila, Phormia, Papilio, Bombyx, Chilo, Heliothis, Mamestra, Agrotis, and Anopheles.

Biological activity

Tyramine is a norepinephrine and dopamine releasing agent (NDRA) and indirectly acting sympathomimetic. Evidence for the presence of tyramine in the human brain has been confirmed by postmortem analysis. Additionally, the possibility that tyramine acts directly as a neuromodulator was revealed by the discovery of a G protein-coupled receptor with high affinity for tyramine, called the trace amine-associated receptor (TAAR1). The TAAR1 receptor is found in the brain, as well as peripheral tissues, including the kidneys. Tyramine is a full agonist of the TAAR1 in rodents and humans.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Tyramine

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

In research: Tyramine 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 Tyramine 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: Tyramine is common in secondary-school and first-year university syllabi. It links to neighbouring topics 4-Hydroxyphenyl compounds, Antihypotensive agents, Drugs not assigned an ATC code, so understanding it makes those chapters shorter.
In everyday life: Look for Tyramine 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 Tyramine in 20 minutes

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

Frequently asked questions

What is Tyramine in simple terms?

Why does Tyramine 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 Tyramine?

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 Tyramine.