Lactobacillus delbrueckii subsp. lactis|337402 |BNCC

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Lactobacillus delbrueckii subsp. lactis

Subculture procedure	① Prepare 1-2 plates as above and sterile water (pre-placed in anaerobic environment for 24h to remove oxygen); ② Open in a safety cabinet, cauterize the top with a spirit lamp, then quickly add sterile water to rupture it; break it into pieces with forceps; ③ Pipette 0.5mL sterile water into the freeze-dried vial, dissolve the powder thoroughly, then dispense 200μL/well onto plates and spread evenly; ④ Incubate plates under specified conditions until colonies emerge.
Growth conditions	37°C; 24-48h; anaerobic
Storage conditions	2-8°C
Safety level	1
morphology	Colony diameter: 1-2 mm; circular, with neat, opaque edges and a raised center. Surface: grayish-white, smooth, glossy, moist texture, easily liftable. Gram-positive (blue-violet), bacilli. Purity: Pure
Sharing mode	Public welfare sharing

Lactobacillus leichmannii

Storage conditions : 2~8 ℃

No. : 337402

Product format: freeze dried, 200ul

Validity period: 6 years

Biosafety level : 1 , handle in ultra-clean 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, MRS medium, 18-24h. 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 0.04g, Tween 80 1.0g, agar 20.0g (not included in liquid medium), distilled water 1.0L. pH 5.7±0.2. Sterilization at 121 ℃ for 15min.

Recovery steps:

(1)Prepare a test tube containing 5-10mL of liquid culture medium and 2 plates;

(2)Open it in the 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 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.

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

item	test results
viability	good viability,in 20h liquid medium become turbid, obvious strain layer occurs on the plate,colony is typical on marked plate.
colony morphology: (above)	size: 1-2mm shape: round edge: irregular transparency: opaque color: white bulge: middle bulge surface: bright texture: viscous and moist
conclusion	good viability, no abnormal colony morphology, qualified

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