Inactivating process for lipid envelopped virus, and new antivirus lipopeptides

A method of inactivating substantially all lipid-enveloped viruses in a composition comprising at least one isolated protein which comprises

• contacting said composition with a cyclic lipoheptapeptide of the following formula (I)
• a salt, ester or mixture thereof, at temperatures higher than room temperature, for a period of 5-30 min and in an amount effective to inactivate substantially all lipid-enveloped viruses in the composition,
• wherein in the formula (I), X and Y each independently represent the amino acids Leu, Ile or Val, Z represents the amino acids Val or Ala, and C10-12 represents a linear or branched, saturated alkyl group.

Isolated lipoheptapeptides of general formula I

• and the salts and esters thereof, in which formula I X and Y independently represent Val or Ile, and Z represents Val.