Pyrylium-1
A dye that turns fluorescent orange when it binds to amines
No single value: Pyrylium-1 is a material, and its colour varies. The background shows its family, orange.
Pyrylium-1 is a chemical dye that itself is not fluorescent, but glows orange after reacting with primary amines. First described in 2004, it is used to detect amines and peptides, especially in sensitive laboratory tests using laser-induced fluorescence.
- Turns fluorescent orange after binding to amines
- First described in 2004
- Used for sensitive detection in lab tests
- Excited by green light, emits orange light
- Known as a 'chameleon label' dye
What colour is Pyrylium-1?
Pyrylium-1 is a laboratory dye that changes colour when it reacts with certain chemicals. On its own, it does not glow under light, but after binding to primary amines (a type of chemical group found in proteins and peptides), it becomes strongly fluorescent. When excited with green light, the dye emits an orange glow, which makes it easy to detect even small amounts of the target substance. This colour change is why it is called a 'chameleon label'.
Where does Pyrylium-1 come from?
The name 'Pyrylium-1' comes from its chemical structure, which is based on a pyrylium ring. It was first described in 2004 as part of research into new dyes for detecting amines. The 'chameleon label' term refers to its ability to change colour after reacting with its target, rather than being a fixed colour itself.
How is Pyrylium-1 made?
Pyrylium-1 is a synthetic compound, prepared in the laboratory as a salt combining a pyrylium derivative and tetrafluoroborate. It is not found in nature. The dye is designed to react with primary amines, forming a new compound that is fluorescent. The reaction adds a specific mass to the target molecule, which can be measured in laboratory tests.
Where Pyrylium-1 is used
This dye is mainly used in laboratory settings to detect amines and peptides, especially in a technique called CE-SDS, which separates and analyses proteins. After binding to its target, Pyrylium-1 is excited by green light (503 nm) and emits orange light (603 nm), making it suitable for use with common laser equipment. Its high sensitivity allows scientists to detect very small amounts of proteins.
Orange around the world
What the orange family means from country to country.
The lowest band of the flag is orange, often called apricot, after the national fruit. The constitution says it stands for the creative talent and hard work of the people.
Politics and protestNature and renewalPrideSource: Flag of ArmeniaThe flag is split corner to corner. The orange half stands for the Buddhist tradition, and the white dragon across the middle for purity.
Sacred and holySource: Flag of BhutanOn 30 September people wear orange shirts to remember the children sent to residential schools. Phyllis Webstad's new orange shirt was taken from her on her first day at one.
Mourning and deathPolitics and protestGriefSource: National Day for Truth and ReconciliationOrange is also the colour of the New Democratic Party. Its sweep of Quebec seats in the 2011 election was called the Orange Wave.
Politics and protestSource: New Democratic PartyThe flag shows the island in copper orange on white. The colour recalls copper, which was mined here in ancient times and may have taken its name from Cyprus.
Politics and protestNature and renewalSource: Flag of CyprusThe orange stripe of the flag stands for Protestants, the followers of William of Orange. In Northern Ireland the Orange Order still marches each 12 July in orange sashes.
Politics and protestSource: Orange OrderShades and relatives of Pyrylium-1
Pyrylium-1 is related to other amine-labeling dyes such as FQ and CBQCA, which also become fluorescent after reacting with amines. These dyes may have different colours or properties, but all are used for sensitive detection in laboratory tests. Pyrylium-1 is part of a broader group called 'chameleon labels' because of their colour-changing behaviour.
Questions people ask about Pyrylium-1
What colour is Pyrylium-1?
Pyrylium-1 itself is not fluorescent, but after reacting with primary amines, it emits orange light when excited by green light.
Where does the name Pyrylium-1 come from?
The name comes from its chemical structure, which is based on a pyrylium ring. The '-1' distinguishes it from other related compounds.
What is Pyrylium-1 used for?
It is used in laboratory tests to detect amines and peptides, especially in protein analysis using laser-induced fluorescence.
How does Pyrylium-1 work?
It reacts with primary amines to form a fluorescent product, allowing scientists to detect the presence of these groups in samples.
Good reading and sources
The facts on this page come from the Wikipedia article "Pyrylium-1", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). Rang rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes. The swatch is an approximation: named colours are not fixed standards, and every screen shows them a little differently. If something is wrong, tell us. Last refreshed 2026-10-03.
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