Swirl, Do Not Shake: Why Foam Is Bad for Peptide Solutions

One of the oldest tips in any lab is to swirl solutions gently and never shake them. It sounds fussy, but there is real science behind it.

The air-water interface

Water and air meet at a surface, and peptide and protein molecules like to gather there. When you shake a vial, you create thousands of tiny bubbles, which multiplies the surface area many times over.

What happens at the surface

Molecules that land on the interface can partly unfold, because one side faces water and the other faces air. Some then stick together. In larger proteins this can cause visible clumps. In short peptides the effect is smaller, but foam can still cause loss of material and uneven concentration.

Practical steps for researchers

• Add the solvent slowly down the inner wall of the vial, not straight onto the powder.
• Swirl or roll the vial gently.
• Let it sit a few minutes. Most short peptides dissolve on their own.
• Do not vortex unless a protocol calls for it.

What about the diluent?

Use a clean, sterile solvent such as Lab Solution 10ML and note the lot number in your records. If bubbles do form, let them settle before drawing up any volume, and keep reading for how to record your work.

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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.