chemistry

Oleanolic acid

Oleanolic 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 Oleanolic acid rather than just read about it. In short: Oleanolic acid or oleanic acid is a naturally occurring pentacyclic triterpenoid related to betulinic acid. It is widely distributed in food and plants where it exists as a free acid or as an aglycone of triterpenoid saponins.

Key takeaways

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

Reference excerpt

Oleanolic acid or oleanic acid is a naturally occurring pentacyclic triterpenoid related to betulinic acid. It is widely distributed in food and plants where it exists as a free acid or as an aglycone of triterpenoid saponins.

Natural occurrence Oleanolic acid can be found in olive oil, Phytolacca americana (American pokeweed), and Syzygium spp, garlic, etc. It was first studied and isolated from several plants, including Olea europaea (leaves, fruit), Rosa woodsii (leaves), Prosopis glandulosa (leaves and twigs), Phoradendron juniperinum (whole plant), Syzygium claviflorum (leaves), Hyptis capitata (whole plant), Mirabilis jalapa and Ternstroemia gymnanthera (aerial part). Other Syzygium species including java apple (Syzygium samarangense) and rose apples contain it, as does Ocimum tenuiflorum (holy basil).

Biosynthesis of oleanolic acids Oleanolic acid biosynthesis starts with mevalonate to create squalene. Squalene monooxygenase in the next step oxidases the squalene and forms an epoxide resulting in 2,3-oxidosqualene. Beta-amyrin synthase creates beta-amyrin by a ring formation cascade. After the formation of beta amyrin, CYP716AATR2, also known as a cytochrome p450 enzyme, oxidizes carbon 28 turning it into alcohol. CYP716AATR2 converts the alcohol to aldehyde and finally to a carboxylic acid forming oleanolic acid.

Pharmacological research Oleanolic acid is relatively non-toxic, hepatoprotective, and exhibits antitumor and antiviral properties. Oleanolic acid was found to exhibit weak anti-HIV and weak anti-HCV activities in vitro, but more potent synthetic analogs are being investigated as potential drugs. An extremely potent synthetic triterpenoid analog of oleanolic acid was found in 2005, that is a powerful inhibitor of cellular inflammatory processes. They work by the induction by IFN-γ of inducible nitric oxide synthase (iNOS) and of cyclooxygenase 2 in mouse macrophages. They are extremely potent inducers of the phase 2 response (e.g., elevation of NADH-quinone oxidoreductase and heme oxygenase 1), which is a major protector of cells against oxidative and electrophile stress. A 2002 study in Wistar rats found that oleanolic acid reduced sperm quality and motility, causing infertility. After withdrawing exposure, male rats regained fertility and successfully impregnated female rats. Oleanolic acid is also used as standard for comparison of hyaluronidase, elastase and matrix-metalloproteinase-1 inhibition of other substances in primary research (similar to diclofenac sodium for comparison of analgesic activity). Oleanolic acid activates telomerase in peripheral blood mononuclear cells (PBMCs) 5.9-fold, more than any other compounded tested, with the exception of Centella asiatica (8.8-fold). Less telomerase activation is seen for Astragalus extract 4.3-fold, TA-65 2.2-fold, and maslinic acid 2-fold.

See also Ursolic acid Betulinic acid Moronic acid Momordin (saponin), a glycoside of oleanolic acid List of phytochemicals in food

References

Illustrations

Worked examples

Example 1 — a first encounter with Oleanolic acid

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

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

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

Frequently asked questions

What is Oleanolic acid in simple terms?

Why does Oleanolic 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 Oleanolic 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 Oleanolic acid.