63016 Sigma-Aldrich

M-17 Agar

for microbiology



Related Categories A - M, All Dairy Media (alphabetical), All Solid Media/Agars, Dairy Culture Media for Bacteria, Dairy Quality Control Media,
grade   for microbiology
shelf life   limited shelf life, expiry date on the label
composition   agar, 12.75 g/L
  ascorbic acid, 0.5 g/L
  casein peptone (tryptic), 2.5 g/L
  disodium β-glycerophosphate pentahydrate, 19 g/L
  magnesium sulfate hydrate, 0.25 g/L
  meat extract, 5 g/L
  meat peptone (peptic), 2.5 g/L
  soyapeptone (papainic), 5 g/L
  yeast extract, 2.5 g/L
final pH   7.1±0.2 (25 °C)
suitability   nonselective for Lactococci
  nonselective for Streptococcus


Preparation Note

Supplement: 5 g/l lactose (Cat. No. 17814)


M-17 Agar media is proposed for the cultivation, detection and enumeration of Iactic streptococci in milk and dairy products. The M-17 media are superior to other comparable culture media for the cultivation of the fastidious species Streptococcus cremoris, Streptococcus diacetilactis and Streptococcus Iactis. It is also suitable for cultivation and maintenance of starter cultures for cheese and yogurt manufacturing. This medium helps in detecting streptococcal mutants which are lactose non-fermenters.

Price and Availability

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis

Protocols & Articles


Microbiology Introduction

An initial aim of all microbiologists is the reproducible growth of their microbial cultures, no matter whether the microorganisms are of natural origin or have been genetically engineered by man. Re...
Keywords: Absorption, Aerobic, Anaerobic, Antibiotics, Antimicrobials, Buffers, Culture media, Diffusion, Environmental, Filtration, Genetic, Growth factors, Metabolism, Phase transitions, Precipitation, Reductions, Respiration, Sample preparations, Vitamins

Microbiology Theory: Media Preparation

Microorganisms need nutrients, a source of energy and certain environmental conditions in order to grow and reproduce. In the environment, microbes have adapted to the habitats most suitable for thei...
Keywords: Culture media, Digestions, Environmental, Filtration, Growth factors, Indicators, Microbiology, Phase transitions, Precipitation, Vitamins

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