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SOP for Sub-culturing and Maintenance of Microbial Cultures


Standard operating procedure to sub-culture and maintain the procured microbial cultures to get one slant every month to prepare the culture suspension for microbial analysis.

1.0  OBJECTIVE:

       To lay down the procedure for sub-culturing and maintenance of Microbial Cultures.

2.0  SCOPE:

       This SOP is applicable to the Quality Control Dept.

3.0  RESPONSIBILITY: 

       Microbiologist

4.0  ACCOUNTABILITY:

       Head Quality Control Department.

5.0  PROCEDURE:

5.1  Source: Organisms used for Microbiological analysis should be procured from a National or International recognized institute.
5.2  Approved Vendor: NCIM, Pune, India.
5.3  Mode of Supply: Freeze dried cultures are supplied in vacuum-sealed glass ampoules or sub-cultured on slants.

5.4  For Reviving Cultures:

5.4.1  Prepare the specified growth medium as per the procedure given in the SOP for Preparation of Microbiological Culture Media.
5.4.2  Transfer the Culture slants to the Microbiology testing area as per the procedure given in the SOP for Entry and Exit Procedure in to Microbiology Section.
5.4.3  Disinfect the culture slant surface with 70% isopropyl alcohol.
5.4.4  Remove the cotton plug and flame the neck of the tube carefully.
5.4.5  Transfer a loopful of freeze-dried culture in 10 ml of 0.9% sterile saline solution.
5.4.6  Again flame the neck of the tube to avoid the contamination and replace the cotton plug properly.
5.4.7  Mix the inoculated tube well to disperse the cells and incubate at the required temperature for 18-24 hrs.

5.5  Master Slant Preparation:

5.5.1  Prepare the required Culture media slants for different microorganisms as per the procedure given in the SOP for Preparation of Microbial Culture Media and mention the name of the media on each slants.
5.5.2  Take the slants and the incubated culture suspension in to the microbiology testing area as per the procedure given in the SOP for Entry and Exit Procedure to Microbiology Section.
5.5.3  Streak a loopful of culture form the 24 hours old culture suspension on to the respective media slants as described above and incubate at specified temperature. Hence one will be Master culture, second will be stock culture and third will be working culture, incubate at specified condition mentioned.
5.5.4  Label the slants.
5.5.5  Preserve the grown culture in refrigerator at 2 to 6°C.
5.5.6  Prepare four master culture slants, one stock culture slant and one working culture slant from the 10 ml of culture suspension.
5.5.7  Sub-culturing in the pattern to get one slant per month.
5.5.8  Check the purity of mother culture at the time of sub culturing. Stock culture purity is also checked monthly by the same manner by colony morphology and gram staining.

6.0  ABBREVIATIONS:

6.1  NCIM : National Collection of Industrial Micro organisms
6.2  QC : Quality Control
6.3  Dept. : Department
6.4  SOP : Standard Operating Procedure
Ankur Choudhary is India's first professional pharmaceutical blogger, author and founder of Pharmaceutical Guidelines, a widely-read pharmaceutical blog since 2008. Sign-up for the free email updates for your daily dose of pharmaceutical tips.
Email: .moc.enilediugamrahp@ofni Need Help: Ask Question


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