Indicator organisms. !Group of microorganisms use to reflect the quality and safety of a process food product
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1 Indicator Organisms
2 Indicator organisms!group of microorganisms use to reflect the quality and safety of a process food product!indicator organism in water!vibrio cholera!salmonella typhi!shigella spp!coliforms and fecal coli!hepatitis!indicator organism in food!coliforms!e. coli
3 Criteria for use of an organism as an indicator!must be associated with feces!should not be a natural contaminant!easy to detect!test should be less complex than test for pathogen!growth limit under conditions!should not survive processing!processing should have same effect on pathogens
4 Suggested indicator organisms!fecal organism!fecal coliform!escherichia coli!enteric bacteria!shigella spp.!salmonella spp.
5 Coliforms!Coliform indicates processing contamination! Coliform can grow on food processing equipment or in environment!several genera are considered to be coliforms! Escherichia! Enterobactor! Klebsiella! Citrobactor! Source of coliforms! Fecal group --GI tract of humans and animals! Non-fecal group --Soil and plant
6 Coliforms! Coliform group!gram negative, rod shape, aerobic or facultative aerobic!non endospore former!ferments lactose at C for hrs! Fecal coliform!found only in GI tract!can grow at elevated test temperature!ferment LST (Lauryl Sulfate Tryptose) at 44.5 C for 24 hrs
7 !Methods for isolation of coliforms!selective plating!most probable number (MPN)!Selective plating!presumptive test!solid media!vrba (Violet red bile agar)!confirm test Coliforms!Selective and differential media!emb (Eosin Methylene Blue agar)
8 Coliforms Selective plating VRB PCA slant EMB I nnoculate
9 !Methods for isolation of coliforms!most probable number (MPN)!Presumptive test!liquid media (MPN)!LST (Lauryl Sulfate Tryptose)!Confirm test!liquid media (MPN) Coliforms!BGLB (Brillant Green Lactose Bile broth)!ec (EC broth) (Lauryl Sulfate Tryptose)
10 Coliforms Most probable number (MPN) Presumptive test Confirm test TST medium BGLB medium EC medium Incubate Positive: Gas production Change of medium color Coliform MPN/ ml Fecal coliform MPN/ ml
11 Presumptive test of coliforms!lst (Lauryl Sulfate Tryptose) or Lactose broth (LB)!triplicate tubes for each dilution!incubate LST at C for hrs!coliform grow---turbidity and gas!vrba (Violet Red Bile Agar)!pour plate method---pour VRBA on plate and overlay!incubate at C for hrs!red, purple colonies with ring of precipitate bile salt around colonies
12 Confirmation of coliforms!bgb (Brilliant Green Bile Broth)!Incubate BGB at C for hrs!coliform reported as MPN/ml or gm!ec (EC broth)!incubate EC at 44.5 C for 24 hrs!fecal coliform reported as MPN/ml or gm
13 Identification of coliforms!select colony or positive tubes and streak onto PCA slants!identify the microorganism!gram stain!biochemical test!imvic test!indole test!methyl red!voges-proskauer!citrate utilization!selective media!emb agar (Eosin Methylene Blue Agar)
14 Identification of coliforms IMViC test: use to differentiate between the coliform group!indoletest!bacteria degrade tryptophan to indole!methyl red!bacteria produce acid from glucose!voges-proskauer!detect acetylmethylcarbinol from glucose!citrate utilization!bacterial utilize citrate as a carbon source
15 Identification of coliforms IMViC test Organism I ndole Methyl red Voges-Proskauer Citrate E. coli E. aerogenes
16 Identification of coliforms!selective media!emb (Eosin Methylene Blue) medium!selective and differential plating for isolation and identification of Gram-negative enteric bacteria!eosin and methylene blue used as indicators!bacteria ferment lactose!sucrose used to detect coliform that ferment sucrose!e. coli!enterobacter spp.!klebsiella spp. dark colony with black center and green metalic sheen pink clony dark center colony
17 Coliforms Presumptive test Confirm test TST medium BGLB medium EC medium Incubate Positive: Gas production Change of medium color Coliform MPN/ ml Fecal coliform MPN/ ml
18 Coliforms IMViC test VRB 10 1 OR BGLB/ EC PCA slant +/- +/- +/- +/ I nnoculate EMB 10 3
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