I am working on probiotic bacteria for fish, and I am trying to isolate probiotic bacteria like lactic acid bacteria or other probiotics from the gastrointestinal tract of fish using different media like, MRS agar media, TSA, L.B agar, and with different fish species.
all isolates of bacteria from all different media and from all different fish species were catalase positive. that's why I wonder should all lactic acid bacteria be catalase negative? should all probiotic bacteria be catalase negative?
THANKS, I
Hello,
Download PDF
Published: 29 September 1956
Catalase Production by Lactobacilli
J. C. DACRE & M. ELISABETH SHARPE
Abstract
LACTOBACILLI are considered to be catalase-negative1, or occasionally to produce very small amounts of catalase2. The lactobacilli isolated from dairy products have always been found to be catalase-negative3,4. During recent work on the microflora of Cheddar cheese, we have encountered strains of lactobacilli which possess both strong and weak catalase activity. Three strains of Lactobacillus plantarum, originally isolated by Sherwood3 from New Zealand Cheddar cheese, were found to be catalase-positive. Two of the strains gave strong catalase reactions whereas the other strain was much weaker (see Table 1). Serological5 and physiological6 tests have shown that these latter organisms are typical strains of L. plantarum.
@ Karen A. Darbinyan, thanks a lot for your answer. I appreciate that
@ Carole C Tranchant, thank you very much dear for your answer.
Lactic acid bacteria (LAB) are a group of Gram-positive, non-spore forming, cocci or rods, catalase-negative, and fastidious organisms, with high tolerance for low pH [1,2,3].
During recent work on the microflora of Cheddar cheese, we have encountered strains of lactobacilli which possess both strong and weak catalase activity. Three strains of Lactobacillus plantarum, originally isolated by Sherwood3 from New Zealand Cheddar cheese, were found to be catalase-positive.
- Badges
- Science topic
- Similar topics
- Biological Science
- Biochemistry
- Biochemical Techniques
- Analytical Chemistry
- pH