Reading lipid shorthand for a custom synthesis request

Start with the headgroup.

PC, PE, PG, PS and PA commonly refer to phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylserine and phosphatidic acid. For a custom request, name the headgroup and identify any attached label or modification.

If a publication or supplier uses a shortened name, include its drawing or identifier. We want to discuss the same structure you are using, rather than silently fill in missing details.

Chain notation has levels of detail.

For a simple fatty-acyl chain, 18:1 indicates 18 carbons and one double bond. It does not give that bond’s location or geometry. Adding 9Z distinguishes a particular arrangement.

In LIPID MAPS shorthand, PC 34:1 states a sum composition. PC 16:0_18:1 identifies chains without assigning their sn-positions. PC 16:0/18:1 assigns the chain order. These names communicate different structural resolution; they are not interchangeable specifications.

For a lyso lipid, say which chain remains.

A lyso glycerophospholipid has one chain and one free hydroxyl on its glycerol backbone. “20:4 lyso PE” alone does not identify the occupied sn-position. State whether the requested material is 1-acyl-2-lyso or 2-acyl-1-lyso, and include a drawing when possible.

In a synthesis brief, also discuss whether positional purity is essential to your study. Ask the team to define how that requirement will be assessed and maintained during the agreed handling conditions.

Turn the name into a reviewable specification.

Before you request a quote, separate fixed structural requirements from open questions. A literature structure, a marked drawing or a SMILES string is useful alongside the shorthand. You do not need to design a synthetic route yourself.

• Headgroup, backbone, linkages and stereochemistry
• Chain identities, positions and double-bond details
• Label, linker or handle position, if applicable
• Quantity and analytical evidence your experiment needs