Stabilisation of biological samples

A container for collecting a cell-containing biological sample, wherein the container comprises a composition capable of stabilizing a cell-containing biological sample, the composition comprising:

• a) at least one N,N-dialkylpropanamide according to formula 1
• wherein R1 is a hydrogen residue or an alkyl residue, R2 and R3 are identical or different hydrocarbon residues with a length of the carbon chain of 1-20 atoms arranged in a linear or branched manner, and R4 is an oxygen, sulphur or selenium residue;
• and
• b) at least one anticoagulant,
• wherein the container is evacuated to an internal pressure that is selected to draw a predetermined volume of a cell-containing biological sample.