Streptococcus thermophilus|BNCC335885 |BNCC

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Streptococcus thermophilus

Culture medium	M17 agar (M17):M17 agar: soybean peptone 5.0g peptone 2.5g cheese peptone 2.5g yeast powder 2.5g beef powder 5.0g lactose 5.0g sodium ascorbate 0.5g sodium β-glycerophosphate 19.0g magnesium sulfate 0.25g agar 12.75g (liquid medium does not contain) pH 7.2±0.2,25 ℃
Subculture procedure	(1) Prepare a test tube containing 5~10mL of liquid medium and 2 plates; (2) Open it in the safety cabinet, heat the tip of ampoule in a flame, quickly drop sterile water to creak it, then break it with forceps; (3) draw 0.5mL of liquid culture medium into a freeze dried ampoule, fully rehydrate and transfer the solution to the liquid test tube, mix evenly; (4) inoculate a plate with 0.2mL of suspension liquid, repeat the step to obtain two plates; ⑤ Put all the liquid test tubes and plates under the above culture conditions for cultivation, and the strains can be used when they grow.
Growth conditions	45 ℃;24-48h; Aerobic
Storage conditions	2-8 ℃
Sharing mode	Public welfare sharing

1.Description

1. Name : Streptococus thermophilus Orla-Jensen

2. BNCC No.: 335885

3. Biosafety level: 4

2. Storage conditions:

Storage of freezed dried ampoule and agar slant at 2°C to 8°C

3. Growth Conditions

1. Name of culture medium: sterile skim milk

2. Medium composition: skimmed milk (10% skimmed milk powder),121 ℃, sterilization for 15 minutes.

3. Atmosphere: micro aerobic or anaerobic

4. Temperature: 50 ℃

4. Notes:
1.Normal culturing time, 24-48hours for bacterial, 72 hours for yeast, 5-7days for mould, 7-10days for fungal.

2.Agar slant shall be inoculated asap, and do not keep the storage for more than 3 months.

3.Please recover the strains in strict accordance with this instruction, otherwise the replacement of the strain are not be available in case of viability loss caused by different media or growth conditions.

4.Waste generated from the handling process should be discarded after high-pressure sterilization