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Products‎ > ‎PRAS Mono-Plated Media‎ > ‎

Lactobacillus-MRS Agar (LMRS)

Lactobacillus-MRS Agar (LMRS AGAR) is an enriched selective medium intended for the isolation and cultivation of Lactobacillus found in clinical specimens and dairy and food products. LMRS AGAR is an enriched selective medium that is useful in the cultivating of Lactobacillus from clinical, dairy and food samples.  The basal medium consists of peptones yeast extract and glucose.  This medium is supplemented with sorbitan monooleate complex (a source for fatty acids) and magnesium for additional growth requirements.  Sodium acetate and ammonium citrate are added to inhibit normal flora, such as gram-negative bacteria, oral flora and fungi.  With the addition of both of these inhibiting agents, it has shown to improve the growth of Lactobacillus.  The pH is adjusted to 6.3 - 6.7 to favor the growth of Lactobacillus.  This medium is prepared, dispensed, stored and packaged under oxygen-free conditions to prevent the formation of oxidized products prior to use.

 Anaerobe Systems PRAS Lactobacillus-MRS Agar
                            (LMRS) AS-6429


View the full product insertLMRS Insert.pdf

Lactobicilli-MRS Agar Products 

 Item #    

Description 

Size 

Price 

 AS-6429

LMRS mono plate 

4 plates 

7.85 






Formula

Bacto Proteose Peptone #3, 10.0 g

Bacto Beef Extract, 10.0 g

Yeast Extract, 5.0 g

Dextrose, 20.0 g

Sorbitan Monooleate Complex, 1.0 g

Ammonium Citrate, 2.0 g

Sodium Acetate, 5.0 g

Magnesium Sulfate, 0.1 g

Manganese Sulfate, 0.05 g

Potassium Phosphate, dibasic, 2.0 g

Bacto Agar, 15.0 g

Distilled Water, 1000.0 ml

 

Final pH 6.4 +/- 0.2 at 25 degrees C.

Final weight 16.0 g +/- 1.6.

 

Precautions

For IN VITRO DIAGNOSTIC USE only.  Approved biohazard precautions and aseptic techniques should be observed when using this product.  This product is for use only by properly-trained and qualified personnel.  Sterilize all biohazard waste prior to disposal.

 

Storage and Shelf Life

Storage:  Upon receipt, store at room temperature (13°C - 27°C) in original packaging until use.  Avoid overheating or freezing.  Do not use medium if there are signs of deterioration (shrinking, cracking or discoloration due to oxidation of media) or contamination.  The expiration date applies to the product in its original packaging and stored as directed.  Do not use product past the expiration date shown on the container.

Shelf Life:  90 days from date of manufacture.

 

Procedure

Specimen Collection:  Specimens for anaerobic culture should be protected from air (oxygen) during collection, transport and processing of specimens.  Consult appropriate references for detailed instructions concerning collection and transport of anaerobes.

Methods for Use:  LMRS AGAR should be inoculated directly with clinical material.  Inoculated plates should be immediately placed in the appropriate atmosphere and incubated at 35 – 37oC for 18 – 48 hours.  Additional periods of incubation may be necessary to recover some anaerobes.  Detailed instructions for processing anaerobic cultures can be found in the appropriate references.

 

Materials Required But Not Provided

Standard microbiological supplies and equipment such as loops, pipets, saline blanks, slides, staining supplies, microscope, incinerator or autoclave, incubators, anaerobic chamber or anaerobic jars, disinfectant, other culture media and serological and biochemical reagents.

 

Limitations

LMRS AGAR will not provide complete information for the identification of bacterial isolates.  Additional test procedures and media are required for complete identification.  Consult reference materials for additional information.

 

Quality Control

If used properly, this medium should support good growth of Lactobacillus from clinical and non-clinical specimens.

The following organisms are routinely used for quality assurance performance testing at Anaerobe Systems. 

Organism Tested

ATCC #

 

Results

Time (Hours)

Lactobacillus vaginalis

49540

Growth

24 – 48 h

Lactobacillus acidophilus

4356

Growth

24 – 48 h

Lactobacillus crispatus

33197

Growth

24 – 48 h

Lactobacillus jensenii

25258

Growth

24 – 48 h

Lactobacillus fermentum

9338

Growth

24 – 48 h

Proteus mirabilis

12453

Growth

24 h

Staphylococcus aureus     or                Enterococcus faecalis

25923

29212

Growth

24 h

Escherichia coli

25922

Growth

24 h

 

User Quality Control: The final determination to the extent and quantity of user laboratory quality control must be determined by the end user.

If sterility testing is to be performed on this product, the appropriate percentage of the original shipment amount should be incubated anaerobically and aerobically for 48 – 96 hours.

If the nutritive capacity of this medium is to be tested for performance, it is recommended that the following ATCC organisms be evaluated for growth.

 

Organism

Growth in

 

Hours

L. acidophilus

24-48 hrs

L. crispatus

24-48 hrs

L. fermentum

24-48 hrs

L. jensenii

24-48 hrs

S. aureus

24 hrs

 

Physical Appearance:  LMRS AGAR should appear as a translucent to opaque-yellowish color.


References

1.        Dowell, V. R., Jr. and T. M. Hawkins.  1974Laboratory Methods in Anaerobic Bacteriology.  CDC Laboratory Manual.  USDHEW C. D. C. Atlanta, GA 30333.

 

2.        Holdeman, L. V., F. P. Cato and W. E. C. Moore.  1977Anaerobe Laboratory ManualVirginia Polytechnic Institute and State University.  Blacksburg, VA 24061.

 

3.        Engelkirk, P. G., Duben-Engelkirk, J. and Dowell, V. R.  1992Principles and Practices of Clinical Anaerobic BacteriologyStar Publishing Co., Belmont, CA 94002.

 

4.        Jousimies-Somer, H. R., Summanen, P., Citron, D. M., Baron, E. J., Wexler, H. M. and S. M. Finegold.  2002Wadsworth – KTL Anaerobic Bacteriology ManualStar Publishing Co., Belmont, CA 94002.

 

5.        Isenberg, H. D.  1992Clinical Microbiology Procedures HandbookAmerican Society for Microbiology Publishing, Washington, D.C. 20005.

 

6.        Murray, R. P., et al.  1999Manual of Clinical MicrobiologyAmerican Society for Microbiology Publishing, Washington, D.C. 20005.

 

7.        De Man, J. C., Rogosa, M. and Sharpe, M. E.  1960.  A medium for the cultivation of lactobacilli.  J. Appl. Bacteriol. 23(1), 130.

 

8.        NCCLS.  Quality Control for Commercially Prepared Microbiological Culture Media; Approved Standard- Third Edition (2004).  NCCLS document M22-A3.  NCCLS, 940 West Valley Road, Suite 1400, Wayne, PA 19087-1898.