Raka-Ray Agar

suitable for microbiology, NutriSelect® Plus

Lactic Acid Bacteria Selective Agar Base

Quality Level





shelf life

limited shelf life, expiry date on the label


N-acetyl glucosamine, 0.5 g/L
agar, 17.0 g/L
betaine hydrochloride, 2.0 g/L
casein enzymic hydrolysate, 20.0 g/L
diammonium hydrogen-citrate, 2.0 g/L
fructose, 5.0 g/L
glucose, 5.0 g/L
liver concentrate, 1.0 g/L
magnesium sulphate, 2.0 g/L
maltose, 10.0 g/L
manganese sulfate, 0.66 g/L
monopotassium phosphate, 2.0 g/L
potassium aspartate, 2.5 g/L
potassium glutamate, 2.5 g/L
yeast extract, 5.0 g/L


NutriSelect® Plus


bioburden testing: suitable
microbiology: suitable

final pH

5.4±0.2 (25 °C)

Featured Industry

Food and Beverages


Pediococcus spp.
selective for Lactobacillus spp.

Related Categories


A medium for selective isolation of lactic acid bacteria from beer and brewing processes

Preparation Note

Suspend 38.5 g in 500 ml of distilled water. Bring to the boil and dissolve the medium completely. Distribute into tubes or bottles and sterilize by autoclaving at 121°C for 15 minutes. Cool to 50-55°C and add contents of 1vial of lactic acid bacteria selective supplement (Cat. No. 14121). Add 3.5 ml of Cycloheximide solution (Cat. No. 18079). Mix well and pour into sterile petri dishes or dispense as desired.


We offer two media types: the superior granulated GranuCult® and the cost-efficient powdered NutriSelect® culture media, depending on your needs.
The designations basic, plus, or prime are added to indicate the quality control level, from basic quality control to standard QC plus to prime for full regulatory compliance.

Legal Information

GRANUCULT is a registered trademark of Merck KGaA, Darmstadt, Germany
NutriSelect is a registered trademark of Merck KGaA, Darmstadt, Germany


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Hazard Statements

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


NONH for all modes of transport

WGK Germany


Certificate of Analysis

Certificate of Origin

C. Van Keer et al.
Journal of the Institute of Brewing, 89, 361-361 (1983)
European Brewing Convention
Journal of the Institute of Brewing, 87, 303-303 (1981)
Molecular biology-based methods, like PCR, can be used for lactobacilli detection. However, they are often quite expensive. We provide a revolutionary molecular biology method that is rapid, easy, and cost-effective.
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Traditional methods are based morphology, staining methods, enzyme reactions (metabolism) and diverse media.
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Today, diverse studies report the benefits of probiotics, such as inhibitory effects on pathogens, aid in the management or prevention of chronic intestinal inflammatory diseases or atopic syndromes, and support to the immune system. Potential beneficial applications abound, researchers continue to evaluate the effictiveness and clarify the mechanisms of action of probiotics.
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Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

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