Scientists who study plant chemicals have found something new in cannabis leaves. They saw a tiny group of natural chemicals called flavoalkaloids that were never recorded before.
The team worked at Stellenbosch University in South Africa. They looked at the chemicals in cannabis that is grown for commercial use. Their work shows that even leaves, which are often thrown away, can hold many useful substances.
Rare Compounds Inside Cannabis Leaves
Flavoalkaloids belong to a big family of plant chemicals known as phenolics. Phenolics help plants make color, protect themselves, and survive harsh conditions.
One well‑known group inside phenolics is flavonoids. These are famous because they may act as antioxidants, reduce inflammation, and even help fight cancer.
Flavoalkaloids are much rarer. In the new study, scientists found 79 phenolic chemicals in three different cannabis strains. Twenty‑five of these had never been seen in cannabis before.
Sixteen of the new chemicals were likely flavoalkaloids. This is the first proof that this rare class exists in cannabis leaves. Most of them showed up in only one of the three strains.
Cannabis Holds Hundreds of Small Molecules
Plants make many tiny molecules called metabolites. Cannabis already has more than 750 of them, but most are present in very low amounts and look alike, which makes them hard to separate.
"Plants usually have very complex mixes of phenolics. Flavonoids are common, but flavoalkaloids are extremely rare," said one of the researchers.
New Lab Techniques Reveal What Older Tests Missed
The discovery came from a special lab method the scientist developed during her graduate studies. The method uses two‑dimensional liquid chromatography together with high‑resolution mass spectrometry.
Liquid chromatography separates chemicals so each one can be studied alone. Doing this in two dimensions gives even better separation when many similar chemicals are present.
High‑resolution mass spectrometry then measures the exact weight of each molecule, helping scientists identify them.
Using these tools, the team could look at cannabis phenolics in far more detail than before.
Separating Rare Chemicals From the Common Ones
The two‑dimensional chromatography was so good that it pulled the rare flavoalkaloids away from the much more common flavonoids. That is why the scientists could see these hidden compounds for the first time.
The result shows a big challenge in plant chemistry: rare chemicals can be hidden by the ones that are more abundant. Better separation methods can uncover substances that were always there, just hard to detect.
Looking Past THC and Other Cannabinoids
Most research on cannabis focuses on cannabinoids like THC, which give the plant its famous effects.
This new work reminds us that there is still much to learn about the plant’s non‑cannabinoid chemistry. The leaves, which are often treated as waste, might hold phenolic compounds useful for future medical studies.
"Our study highlights the medicinal promise of cannabis leaf material that is usually discarded. The plant’s unique non‑cannabinoid profile could be important for biomedical research," the lead researcher concluded.