Nitrite burn in fermented sausage

Area of Science:

• Food microbiology
• Bacterial metabolism
• Food safety

Background:

• Fermented sausages are susceptible to microbial spoilage.
• Nitrite burn is a rare defect in fermented sausages.
• The causative agent of this specific outbreak was previously unidentified.

Purpose of the Study:

• To isolate and identify the microorganism responsible for an anaerobic nitrite burn outbreak in fermented sausage.
• To characterize the metabolic capabilities of the identified microorganism, specifically its nitrate and nitrite reduction pathways.

Main Methods:

• Isolation of the causative agent from affected fermented sausage.
• Microbiological techniques for bacterial identification (e.g., Gram staining, biochemical tests).
• Metabolic assays to determine nitrate and nitrite reduction capabilities.

Main Results:

• A Staphylococcus species was successfully isolated from the fermented sausage exhibiting nitrite burn.
• The identified Staphylococcus isolate demonstrated the ability to reduce both nitrite and nitrate.
• This metabolic characteristic is uncommon among staphylococcal species.

Conclusions:

• The isolated Staphylococcus sp. is the causative agent of the observed anaerobic nitrite burn in fermented sausage.
• This bacterium possesses a unique metabolic profile, reducing both nitrite and nitrate.
• Understanding this organism's metabolism is crucial for preventing future spoilage in fermented products.