Chirality is essential in nearly all biological organization and chemical reaction but is rarely considered due to technical limitations in identifying L/D isomerization. Using OmpF, a membrane channel from E. coli with an electrostatically asymmetric constriction zone, allows discriminating chiral amino acids in a single peptide. The heterogeneous distribution of charged residues in OmpF causes a strong asymmetric electrostatic field at the constriction. This asymmetry forces the sidechains of the peptides to specific orientations within OmpF, causing distinct ion current fluctuations. Using a statistical analysis of the respective ion current variations allows distinguishing the presence and position of each chiral amino acid. To explore potential applications, the disease-related peptide β-Amyloid, and its D-Asp1 isoform, as well as a mixture of the Icatibant peptide drug (HOE 140) and its D-Ser7 mutant, have been discriminated. Both chiral isomers were not applicable to be distinguished by mass spectrum approaches. These findings highlight a novel sensing mechanism for identifying single amino acids in single peptides and even for achieving single-molecule protein sequencing.