The invention relates to a peptidic compound with affinity to bacterial and fungal toxins, especially to lipopolysaccharide or lipoteichoic acid. The peptidic compound includes an amino acid sequence X1KEFX2RIVX3RIKX4FLRX5LVX6, wherein X1 represents the N-terminal part: X2 is K or E; X3 is Q or E; X4 is D or R; X5 is N or E; X6 represents the C-terminal part: an amino acid of the core sequence is optionally derivatized; the N-terminal part is acetylated, and/or the C-terminal part is amidated, and/or the sequence differs from the native amino acid sequence X1KEFKRIVQRIKDFLRNLVX6.