Culture medium for detection of microorganisms causing soy source spoilage and detection method
A culture medium and microbial technology, which is applied in the field of microbial culture medium and detection, can solve the problems of microbial re-contamination, incomplete sterilization of soy sauce, etc., and achieve the effects of low cost, favorable growth and reproduction, and prevention of bottle swelling
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Embodiment 1
[0029] 1. Preparation of culture medium:
[0030] Weigh raw materials: peptone 15g, casein 8g, yeast extract 5g, beef extract 5g, glucose 26g, sodium chloride 6g; add these raw materials into distilled water and stir, dissolve and set the volume to 1000mL, adjust the pH value to 5.0±0.2 Get the culture medium.
[0031] 2. Detection of microorganisms in soy sauce that cause turbidity, flowering and gas production:
[0032] Take 3 clean test tubes with inverted Duchenne tubules inside, fill each of the test tubes with 27mL of the above-mentioned medium, plug the test tube stoppers and wrap the test tubes with kraft paper, and sterilize at 121°C for 30min. The test tube is used as a sterile medium for test tubes.
[0033] Under aseptic operation, take a sterile Erlenmeyer flask containing 5 glass beads, add the soy sauce sample to be tested, keep the natural pH, fully oscillate and shake well, take a test tube of sterile medium in step A as a blank control, Then get 3 test tub...
Embodiment 2
[0036] 1. Preparation of culture medium:
[0037] Weigh raw materials: peptone 15g, casein 8g, yeast extract 5g, beef extract 5g, glucose 26g, sodium chloride 6g; add these raw materials into distilled water and stir, dissolve and set the volume to 1000mL, adjust the pH value to 5.0±0.2 Get the culture medium.
[0038] 2. Detection of microorganisms in soy sauce that cause turbidity, flowering and gas production:
[0039] Take 8 clean test tubes with inverted Duchenne tubes inside, fill each test tube with 27mL of the above medium, plug the test tubes and wrap the test tubes with kraft paper, and sterilize at 121°C for 30min. The test tube is used as a sterile medium for test tubes.
[0040] Under aseptic operation, take a sterile Erlenmeyer flask containing 3 glass beads, add the soy sauce sample to be tested, keep the natural pH, oscillate and shake well, take a test tube of sterile medium in step A as a blank control, Then get 3 test tubes of aseptic medium to inoculate ...
Embodiment 3
[0043] 1. Preparation of culture medium:
[0044] Weigh raw materials: peptone 10g, casein 8g, yeast extract 10g, beef extract 2g, glucose 20g, sodium chloride 8g; add these raw materials into distilled water and stir, dissolve and set the volume to 1000mL, adjust the pH value to 5.0±0.2 Get the culture medium.
[0045] 2. Detection of microorganisms in soy sauce that cause turbidity, flowering and gas production:
[0046] Take 5 clean test tubes with inverted Duchenne tubules inside, fill each of the test tubes with 27mL of the above medium, plug the test tubes and wrap the test tubes with kraft paper, and sterilize at 121°C for 30min. The test tube is used as a sterile medium for test tubes.
[0047] Under aseptic operation, take a sterile Erlenmeyer flask containing 4 glass beads, add the soy sauce sample to be tested, keep the natural pH, fully oscillate and shake well, take 1 tube of sterile medium in step A as a blank control, Then get 3 test tubes of aseptic medium t...
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