chemistry

Petroselinic acid

Petroselinic acid 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 Petroselinic acid rather than just read about it. In short: Petroselinic acid is a fatty acid that occurs naturally in several animal and vegetable fats and oils. It is a white powder and is commercially available.

Key takeaways

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

Reference excerpt

Petroselinic acid is a fatty acid that occurs naturally in several animal and vegetable fats and oils. It is a white powder and is commercially available. In chemical terms, petroselinic acid is classified as a monounsaturated omega-12 fatty acid, abbreviated with a lipid number of 18:1 cis-6. It has the formula CH3(CH2)10CH=CH(CH2)4COOH. The term "petroselinic" means related to, or derived from, oil of Petroselinum, parsley. Despite its name, petroselinic acid does not contain any selenium. Petroselinic acid is a positional isomer of oleic acid.

Occurrence Petroselinic was first isolated from parsley seed oil in 1909. Petroselinic acid occurs in high amounts in plants in Apiaceae, Araliaceae, Griselinia (Griseliniaceae) and in Garryaceae. In Picramniaceae, petroselinic acid is accompanied by tariric acid. In addition, petroselinic acid has been found in minor amounts in several fats of plant and animal origin, including in human sources. The occurrence of petroselinic acid as the major fatty acid is used in chemosystematics as a proof of a close relationship of several families within the Apiales as well as within the Garryales. Besides petroselinic acid, oleic acid has been shown to be present in all cases examined.

Production and chemical behavior Fatty acids mostly occur as their esters, commonly the triglycerides, which are the greasy materials in many natural oils. Via the process of saponification, the fatty acids can be obtained. The trans isomer of petroselinic acid is called petroselaidic acid. In chemical analysis, petroselinic acid can be separated from other fatty acids by gas chromatography of methyl esters; additionally, a separation of unsaturated isomers is possible by argentation thin-layer chromatography.

Uses Petroselinic acid can be used in cosmetics.

References

Worked examples

Example 1 — a first encounter with Petroselinic acid

Start with the simplest possible case. Write down what Petroselinic acid 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 Petroselinic acid 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 Petroselinic acid 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 Petroselinic acid

In research: Petroselinic acid 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 Petroselinic acid 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: Petroselinic acid is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alkenoic acids, Fatty acids, so understanding it makes those chapters shorter.
In everyday life: Look for Petroselinic acid 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 Petroselinic acid in 20 minutes

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

Frequently asked questions

What is Petroselinic acid in simple terms?

Petroselinic acid is a fatty acid that occurs naturally in several animal and vegetable fats and oils. It is a white powder and is commercially available.

Why does Petroselinic acid 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 Petroselinic acid?

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 Petroselinic acid.