chemistry

Kaempferol

Kaempferol 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 Kaempferol rather than just read about it. In short: Kaempferol (3,4′,5,7-tetrahydroxyflavone) is a natural flavonol, a type of flavonoid, found in a variety of plants and plant-derived foods, including kale, beans, tea, spinach, and broccoli. It is also found in propolis extracts.

Key takeaways

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

Reference excerpt

Kaempferol (3,4′,5,7-tetrahydroxyflavone) is a natural flavonol, a type of flavonoid, found in a variety of plants and plant-derived foods, including kale, beans, tea, spinach, and broccoli. It is also found in propolis extracts. Kaempferol is a yellow crystalline solid with a melting point of 276–278 °C (529–532 °F). It is slightly soluble in water and highly soluble in hot ethanol, ethers, and DMSO. Kaempferol is named for 17th-century German naturalist Engelbert Kaempfer.

Natural occurrence Kaempferol is a secondary metabolite found in many plants, plant-derived foods, and traditional medicines. Its flavor is considered bitter.

In plants and food Kaempferol is common in Pteridophyta, Pinophyta, and Angiospermae. Within Pteridophyta and Pinophyta, kaempferol has been found in diverse families. Kaempferol has also been identified in Dicotyledons and Monocotyledons of Angiosperms. The total average intake of flavonols and flavones in a normal diet is estimated as 23 mg/day, to which kaempferol contributes approximately 17%. Common foods that contain kaempferol include: apples, grapes, tomatoes, green tea, potatoes, onions, broccoli, Brussels sprouts, squash, cucumbers, lettuce, green beans, peaches, blackberries, raspberries, and spinach. Plants that are known to contain kaempferol include Aloe vera, Coccinia grandis, Cuscuta chinensis, Euphorbia pekinensis, Glycine max, Hypericum perforatum, Pinus sylvestris, Moringa oleifera, Rosmarinus officinalis, Sambucus nigra, Toona sinensis, and Ilex. It also is present in endive.

Biosynthesis The biosynthesis of kaempferol occurs in four major steps:

Phenylalanine is converted into 4-coumaroyl-CoA 4-Coumaroyl-CoA combines with three molecules of malonyl-CoA to form naringenin chalcone (tetrahydroxychalcone) through the action of the enzyme chalcone synthase Naringenin chalcone is converted to naringenin and then a hydroxyl group is added to form dihydrokaempferol Dihydrokaempferol has a double bond introduced into it to form kaempferol The amino acid phenylalanine is formed from the Shikimate pathway, which is the pathway that plants use in order to make aromatic amino acids. This pathway is located in the plant plastid, and is the entry to the biosynthesis of phenylpropanoids. The phenylpropanoid pathway is the pathway that converts phenylalanine into tetrahydroxychalcone. Flavonols, including kaempferol, are products of this pathway.

Notes

External links Media related to Kaempferol at Wikimedia Commons Flavonoid composition of tea: Comparison of black and green teas

Illustrations

Worked examples

Example 1 — a first encounter with Kaempferol

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

In research: Kaempferol 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 Kaempferol 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: Kaempferol is common in secondary-school and first-year university syllabi. It links to neighbouring topics Antidepressants, Fatty acid amide hydrolase inhibitors, Flavonoid antioxidants, so understanding it makes those chapters shorter.
In everyday life: Look for Kaempferol 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 Kaempferol in 20 minutes

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

Frequently asked questions

What is Kaempferol in simple terms?

Why does Kaempferol 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 Kaempferol?

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 Kaempferol.