Bifidobacterium longum subsp. infantis|BNCC185971 |BNCC

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Bifidobacterium longum subsp. infantis

Culture medium	Improved MRS medium (MMRS): peptone 10.0g, beef paste 10.0g, yeast powder 4.0g, glucose 20.0g, magnesium sulfate 0.2g, sodium acetate 5.0g, triammonium citrate 2.0g, dipotassium hydrogen phosphate 2.0g, manganese sulfate 0.05g, Tween 80 1.0g,L-cysteine 0.5g, agar 20.0g (liquid medium does not contain), distilled water 1.0L. pH 6.2±0.2. Sterilization at 121 ℃ for 15min.
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	37 ℃;2-3 days; Anaerobic;
Storage conditions	2-8 ℃
morphology	Bifidobacterium longum infant subspecies, Gram-positive bacilli, improved MRS bacterial liquid anaerobic culture turbid, plate strain growth is weak, it is recommended to use liquid culture.
application	Microbial strains for feed additives, "Standard Strain for Quality Requirements of GB 4789.28 Medium and Reagents", GB 4789.34-2016 Bifidobacterium Test
Sharing mode	Public welfare sharing

Bifidobacterium longum subsp.

No.: 185971

Storage conditions: 2~8 ℃

Product format ：freeze dried,200ul

Validity period: 6 years

Biosafety level: 1, handle in ultra-clear table or safety cabinet

Receiving notice: if any abnormality is found on the day of receipt, please contact the customer service within 24 hours. If it is overdue, it is deemed that the bacteria are well. The freeze dried culture shall be used up once and shall not be retained. The bacterial viability will resume after 1-2 generation of recovery and can be used normally. Please operate in strict accordance with this instruction, otherwise the replacement of bacteria are not be available in case of aberrant growth and loss of viability.

Growth conditions:37 ℃, anaerobic, modified MRS medium, 48-72h. Improved MRS medium: peptone 10.0g, beef paste 10.0g, yeast powder 4.0g, glucose 20.0g, magnesium sulfate 0.2g, sodium acetate 5.0g, triammonium citrate 2.0g, dipotassium hydrogen phosphate 2.0g, manganese sulfate 0.05g, Tween 80 1.0g,L-cysteine 0.5g, agar 20.0g (not included in liquid medium), distilled water 1.0L. pH 6.2±0.2.

Recovery steps:

(1)Prepare a φ18mm test tube of 10ml liquid medium; and two agar plates

(2)Sterilizing the ampoule, open it in biosafety 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 the freeze dried ampoule, fully rehydrate and transfer the solution to the liquid test tube, mix evenly;

(4)Put the test tube under the above culture conditions for cultivation. The culture solution is obviously turbid or mass growth at the solution bottom occur, this indicates the bacterial grows well.

Recovery record: According to the recovery instructions, the results of the recovery are reported as follows:

item	test results
viability:	good viability,in 48-72h the liquid medium become turbid, and the plate strain is weak.
Colony morphology: (pictured above)	Bifidobacterium longum infant subspecies, Gram-positive bacilli, The anaerobic culture of improved MRS bacterial liquid is turbid and the growth of plate strains is weak. Liquid culture is recommended.
Conclusion:	good viability, no abnormal colony morphology, qualified

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