GHK-Cu Furious Everyone Just Calls It “The Blue One”

GHK-Cu, the copper-bound tripeptide, issued a statement Thursday asking researchers to “please stop calling me the blue one.”

“My name is glycyl-histidyl-lysine copper,” it wrote. “I have a sequence. I have a history. Loren Pickart found me in plasma in the 1970s.”

Why it really is blue

Copper(II) ions absorb light in the orange-red part of the visible spectrum, so the solution looks blue. In the complex, copper is held by nitrogen atoms from the histidine and the peptide backbone. A UV-Vis spectrum shows a broad, shallow absorbance in the visible range, which is a quick, rough way to confirm that copper is present.

A colorful identity crisis

• Strong blue: copper bound as expected
• Washed-out or greenish: check pH, concentration, other metals
• Brown tint: possible oxidation or degradation

“I’m a molecule, not a paint sample,” said GHK-Cu. Its topical form sources quietly confirmed that “yes, it is very blue.”

Researchers can browse GHK-Cu for laboratory use.

Satire. All characters and events are fictional. The science mentioned is real; the people are not.

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For laboratory research use only. Not for human or veterinary use, and not intended to diagnose, treat, cure or prevent any condition. This article is educational and is not medical advice.