chemistry

Palmatine

Palmatine 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 Palmatine rather than just read about it. In short: Palmatine is a protoberberine alkaloid found in several plants including Coptis chinensis (Rhizoma coptidis, chinese goldthread), Corydalis yanhusuo, Tinospora cordifolia (gurjo, heart-leaved moonseed), Tinospora sagittata, Phellodendron amurense (amur cork tree), and Stephania yunnanensis. It is the major component of the protoberberine extract from Enantia chlorantha.

Key takeaways

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

Reference excerpt

Palmatine is a protoberberine alkaloid found in several plants including Coptis chinensis (Rhizoma coptidis, chinese goldthread), Corydalis yanhusuo, Tinospora cordifolia (gurjo, heart-leaved moonseed), Tinospora sagittata, Phellodendron amurense (amur cork tree), and Stephania yunnanensis. It is the major component of the protoberberine extract from Enantia chlorantha. It has been studied for its potential use in the treatment of jaundice, dysentery, hypertension, inflammation, and liver-related diseases. This compound also has weak in vitro activity against flavivirus.

Biosynthesis The biosynthesis of palmatine starts with tyrosine and proceeds via (S)-reticuline in a pathway leading to benzylisoquinoline alkaloids. The final step is catalysed by the enzyme tetrahydroberberine oxidase, which oxidises tetrahydropalmatine:

Alternatively, a methylation reaction catalysed by columbamine O-methyltransferase produces palmatine from columbamine. The methyl group comes from the cofactor, S-adenosyl methionine (SAM). This enzyme was characterised from Berberis wilsoniae.

Metabolism In Corydalis cava, palmatine is converted to corydaline by the enzyme corydaline synthase. The methyl group comes from SAM and the reaction also requires nicotinamide adenine dinucleotide phosphate (NADPH).

Pharmacology

Neuroprotective activity

Palmatine is an inhibitor of acetylcholinesterase (AChE), butyrylcholinesterase (BChE) and neuraminidase-1 (NA-1), and has potential applications in the therapy of Alzheimer's disease. It was found that the positively charged nitrogen on palmatine binds in the gorge of active sire of AChE. Research show that palmatine had antidepressant effect. It was achieved by regulating brain catalase levels, monoamine oxidase-A (MAO-A) activity, lipid peroxidation, plasma nitrite and corticosterone levels.

Regulating blood lipid activity Palmatine achieved hypoglycemic effects by inducing insulin release and insulin-mimicking activity. In addition, studies found that palmatine also inhibited the activity of lens aldose reductase, sucrase and maltase. In vivo research showed that palmatine reduced serum total cholesterol (TC) and triglycerides (TG) and increased serum high-density lipoprotein cholesterol.

Anticancer activity Research showed that palmatine had broad anti-cancer activity. Palmatine had significant growth inhibitory effects on seven human cancer cell lines: 7701QGY, SMMC7721, HepG2, CEM, CEM/VCR, K III and Lewis. In addition, palmatine also had anti-cancer activity on MCF-7, U251, KB, CHOK-1, HT-29 and SiHacell lines. Palmatine induced apoptosis in human skin epithelial carcinoma cells (A431) in a concentration- and time-dependent manner via damaging severely to DNA and inhibiting the activity of Bcl-2 protein. In addition, palmatine can inhibit the proliferation and infiltration of cancer cells.

Antibacterial and antiviral activity Palmitine has inhibitory effect on Gram-positive bacteria which is significantly stronger than that on Gram-negative bacteria, and 9-O-substituted palmatine derivatives exhibited stronger antibacterial activity.

Anti-inflammatory activity Studies have shown that palmatine can decrease the production of pro-inflammatory factors and increase the production of anti-inflammatory factors.

Other pharmacological activity Studies have shown that palmatine chave antioxidant activity, had a protective effect on gastric ulcer, derivatives of palmatine were more effective against ulcerative colitis, including low cytotoxicity to intestinal epithelial cells. In addition, palmatine might have the antiarrhythmic effect, and provideprotection from myocardial ischemia-reperfusion injury.

Toxicity A large number of studies have shown that palmatine has a complex effect on the metabolism of enzymes in the liver, and that palmatine has significant DNA toxicity. However, some 9-O-substituted palmatine derivatives exhibited less toxic than palmatine. In addition, palmatine had higher affinity to nucleic acids than serum proteins, which make them suitable candidates for delivery by serum proteins.

See also Berberine Jatrorrhizine Phellodendrine

References

Illustrations

Worked examples

Example 1 — a first encounter with Palmatine

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

In research: Palmatine 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 Palmatine 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: Palmatine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Acetylcholinesterase inhibitors, Isoquinoline alkaloids, Isoquinolinoisoquinolines, so understanding it makes those chapters shorter.
In everyday life: Look for Palmatine 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 Palmatine in 20 minutes

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

Frequently asked questions

What is Palmatine in simple terms?

Why does Palmatine 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 Palmatine?

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 Palmatine.