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Microbiological, Biochemical, and Electron Microscopic Characterization of a Pectinatus Strain

A spoilage organism isolated from turbid beer is described. The bacterium was gram negative, catalase negative, strictly anaerobic, and rod shaped, having flagella only on one side of the cell. The main metabolic product was propionic acid. In addition acetic, succinic, and lactic acids and acetoin were formed. Malonate inhibited the production of propionic acid by the strain studied and by both Pectinatus and Propionibacterium strains. The guanine-plus-cytosine content of deoxyribonucleic acid was 36 mol%. Differences between this strain and Pectinatus strains were 2 to 5 percentage points. Immunofluorescent staining and gel diffusion precipitin tests revealed that the antigenic structure differed from those of Pectinatus strains. The isolated organism can, despite some differences, be regarded as belonging to the genus Pectinatus.