chemistry

Ricinoleic acid

Ricinoleic 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 Ricinoleic acid rather than just read about it. In short: Ricinoleic acid, formally called 12-hydroxy-9-cis-octadecenoic acid, is a fatty acid. It is an unsaturated omega-9 fatty acid and a hydroxy acid.

Key takeaways

Ricinoleic 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 Ricinoleic acid to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Ricinoleic acid from memory before moving on to harder problems.

Reference excerpt

Ricinoleic acid, formally called 12-hydroxy-9-cis-octadecenoic acid, is a fatty acid. It is an unsaturated omega-9 fatty acid and a hydroxy acid. It is a major component of the seed oil obtained from the seeds of castor plant (Ricinus communis L., Euphorbiaceae), the plant that produces ricin. It is also found in the sclerotium of ergot (Claviceps purpurea Tul., Clavicipitaceae). About 90% of the fatty acid content in castor oil is the ricinolein.

Production Ricinoleic acid is manufactured for industries by saponification or fractional distillation of hydrolyzed castor oil. The first attempts to prepare ricinoleic acid were made by Friedrich Krafft in 1888.

Use Sebacic acid ((CH2)8(CO2H)2), which is used in preparing certain nylons, is produced by cleavage of ricinoleic acid. The coproduct is 2-octanol. The mechanism of the base-induced cleavage is proposed to proceed by initial dehydrogenation of the secondary alcohol, affording the ketone. The resulting α,β-unsaturated ketone undergoes retroaldol reaction, resulting in lysis of the C-C bond. The zinc salt is used in personal care products such as deodorants.

See also Castor oil Lesquerolic acid, a similar chemical, which could be described as ricinoleic acid with -CH2-CH2- group inserted between carboxyl group and the double bond. Polyglycerol polyricinoleate, a polymer of glycerol with ricinoleic acid side chains, used as an emulsifier in chocolate Ricinelaidic acid, the trans isomer of ricinoleic acid Ricinolein, the triglyceride of ricinoleic acid Sodium ricinoleate, the sodium salt of ricinoleic acid Undecylenic acid, a product of pyrolysis of ricinoleic acid

References

Illustrations

Worked examples

Example 1 — a first encounter with Ricinoleic acid

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

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

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

Frequently asked questions

What is Ricinoleic acid in simple terms?

Ricinoleic acid, formally called 12-hydroxy-9-cis-octadecenoic acid, is a fatty acid. It is an unsaturated omega-9 fatty acid and a hydroxy acid.

Why does Ricinoleic 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 Ricinoleic 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 Ricinoleic acid.