chemistry

Very long chain fatty acid

Very long chain fatty 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 Very long chain fatty acid rather than just read about it. In short: In the field of biology, very-long-chain fatty acid (VLCFA) is a fatty acid with 22 or more carbons. In chemistry, these are more commonly knowns as wax acids, a subgroup of saturated unbranched alkanoic acids.

Key takeaways

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

Reference excerpt

In the field of biology, very-long-chain fatty acid (VLCFA) is a fatty acid with 22 or more carbons. In chemistry, these are more commonly knowns as wax acids, a subgroup of saturated unbranched alkanoic acids. The frontier between fatty acids (strictly defined) and wax acids is fluid.

Biological importance Their biosynthesis occurs in the endoplasmic reticulum. VLCFA's can represent up to a few percent of the total fatty acid content of a cell. Unlike most fatty acids, VLCFAs are too long to be metabolized in the mitochondria, in the endoplasmic reticulum (ER) in plants and must be metabolized in peroxisomes. Certain peroxisomal disorders, such as adrenoleukodystrophy and Zellweger syndrome, can be associated with an accumulation of VLCFAs. Enzymes that produce VLCFAs are the targets of herbicides including pyroxasulfone.

Major VLCFAs Some of the more common saturated VLCFAs: lignoceric acid (C24), cerotic acid (C26), montanic acid (C28), melissic acid (C30), lacceroic acid (C32), ghedoic acid (C34), and the odd-chain fatty acid ceroplastic acid (C35). Several monounsaturated VLCFAs are also known: nervonic acid (Δ15-24:1), ximenic acid (Δ17-26:1), and lumequeic acid (Δ21-30:1). The edge case wax acid is behenic acid (C-22).

See also ACADVL SLC27A2 SLC27A5 Cerotic acid, the fatty acid associated with adrenoleukodystrophy

References

Bibliography Moser, H. W.; Moser, A. B.; Frayer, K. K.; Chen, W.; Schulman, J. D.; O'Neill, B. P.; Kishimoto, Y. (1981). "Adrenoleukodystrophy: Increased plasma content of saturated very long chain fatty acids". Neurology. 31 (10): 1241–9. doi:10.1212/WNL.31.10.1241. ISSN 0028-3878. PMID 7202134.

Worked examples

Example 1 — a first encounter with Very long chain fatty acid

Start with the simplest possible case. Write down what Very long chain fatty 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 Very long chain fatty 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 Very long chain fatty 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 Very long chain fatty acid

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

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

Frequently asked questions

What is Very long chain fatty acid in simple terms?

Why does Very long chain fatty 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 Very long chain fatty 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 Very long chain fatty acid.