Biochemical Test of Clostridium botulinum

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(Type A and proteolytic strains of types B and F)

Biochemical Test of Clostridium botulinum

Basic Characteristics Properties (Clostridium botulinum)
Ammonia Production Positive (+ve)
20% Bile Negative (-ve)
Capsule Negative (-ve)
Catalase Negative (-ve)
Flagella Peritrichous
Gelatin Hydrolysis Positive (+ve)
Gram Staining Gram-positive
H2S Positive (+ve)
Hemolysis Positive (+ve). β-hemolytic
Indole Negative (-ve)
Milk Digestion Mostly Positive (+ve)
Meat Digestion Mostly Positive (+ve)
Motility Mostly Positive (+ve)
6.5% NaCl Negative (-ve)
Oxidase Negative (-ve)
Shape Straight to slightly curved rods, 0.6–1.4 × 3.0–20.2 μm.
Spore Positive (+ve)

Fermentation of
Arabinose Negative (-ve)
Cellobiose Negative (-ve)
Fructose Negative (-ve)
Galactose Negative (-ve)
Glucose Positive (+ve)
Glycogen Negative (-ve)
Inulin Negative (-ve)
Lactose Negative (-ve)
Maltose Negative (-ve)
Mannitol Negative (-ve)
Mannose Negative (-ve)
Melibiose Negative (-ve)
Raffinose Negative (-ve)
Rhamnose Negative (-ve)
Ribose Negative (-ve)
Salicin Negative (-ve)
Sorbitol Negative (-ve)
Starch Negative (-ve)
Sucrose Negative (-ve)
Trehalose Negative (-ve)
Xylose Negative (-ve)

Amino Acid Utilization
Arginine Positive (+ve)
Glycine Positive (+ve)
Phenylalanine Positive (+ve)
Proline Positive (+ve)
Serine Positive (+ve)
Tyrosine Positive (+ve)
Tryptophan Positive (+ve)

Enzymatic Reactions
Casein Hydrolysis Positive (+ve)
Esculin Hydrolysis Positive (+ve)
Lecithinase Negative (-ve)
Lipase Positive (+ve)
Superoxide dismutase Positive (+ve)
Tryptophan Deaminase Negative (-ve)

References

  1. Bergey, D H, William B. Whitman, Vos P. De, George M. Garrity, and D Jones. Bergey’s Manual of Systematic Bacteriology: Vol. 3. New York: Springer, 2009. Print.
  2. https://www.vetbact.org/?artid=202
  3. https://www.fda.gov/food/foodscienceresearch/laboratorymethods/ucm070879.htm
  4. http://www.tgw1916.net/Clostridium/botulinum.html
  5. https://www.who.int/csr/delibepidemics/clostridiumbotulism.pdf

About Author

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Sagar Aryal, PhD

Dr. Sagar Aryal is a microbiologist, researcher, and science communicator from Nepal. He is also co-founder and Research Head of the Department of Natural Products at the Kathmandu Research Institute for Biological Sciences (KRIBS), where he leads research on natural product discovery and microbial biodiversity. Dr. Aryal earned his Ph.D. in Microbiology from Tribhuvan University, Kathmandu, Nepal, in 2025, supported by a DAAD Research Grant and a University Grants Commission (UGC) Nepal Ph.D. Fellowship. His research interests include Actinomycetes, Myxobacteria, microbial taxonomy, and natural products, particularly the discovery of bioactive compounds with potential pharmaceutical applications. He isolated and identified Nocardia nepalensis, a novel bacterial species from Nepal, contributing to understanding microbial diversity in the region. Dr. Aryal has published more than 16 research articles in international journals and contributed three book chapters to established academic publications. He has presented scientific research findings and developed international research collaborations through visits to more than 18 countries across Asia, Europe, North America, and Oceania. From 2023 to 2025, he served as the American Society for Microbiology (ASM) Young Ambassador to Nepal. Since December 2025, he has served as an Editorial Board Member of Scientific Reports, a Nature Portfolio journal. In recognition of his scientific contributions, Dr. Aryal received the NAST Science and Technology Youth Award 2025 from the Nepal Academy of Science and Technology. He previously received the Frs. Locke and Stiller Research Award (LSRA) for the 2017-2018 cycle from St. Xavier's College, Kathmandu, and a Nepal Academy of Science and Technology (NAST) Research Grant for 2017-2018. Alongside his scientific career, Dr. Aryal has more than 15 years of experience in blogging, content writing, and search engine optimization (SEO).