TM Media

Testing water has always been an essential part of our laboratory work. Whether it's testing a sample to see if it’s safe to drink or testing the purity in pharma labs, TM Media’s PA E. ColiKit, is an all-in-one product for the job. Let's see why this product is one of the best in water testing.

What Makes the PA E. Coli Kit So Special?

When we talk about water, we must understand that not all water is the same. Sometimes, you've got microbes, mostly coliform bacteria, living in the water, which makes it unsafe for use. The PA E. Coli Kit helps you figure out if these bacteria are causing trouble. It's a quick, budget-friendly solution that's also perfect for those off-the-grid spots where you might have doubts about the safety of water.

Inside the kit:

Providing everything in one place!

PA Medium: Main media for detection of microbial growth

Sterile PET bottle: To carry out the process in

Sterile poly bag: To discard

How Does It Work?

It’s as simple as it gets: add some water to the PET bottle, pour in the PA Medium, give it a good shake, and let it incubate at 35–37 °C. In 18–48 hours, if your mix turns yellow from it, you've got coliforms living in there.

How does it do that?

It's like this kit has everything you need in it. It follows two key rules:

No coliform bacteria should be present in 100 mL of drinking water.

If even one of these microbes is around, it will start a reaction, ferment lactose, and start producing acid and gas.

So, the PA Broth contains lactose and a pH indicator. If lactose is fermented, it'll change colour from the original purple to a vibrant yellow.

Spotting the real from the fake:

With this kit, there's no second-guessing. Different bacteria will make the medium change to specific colours, helping you spot exactly who’s in your water.

Like Escherichia coli, it will have luxuriant growth, and the colour will change to yellow. S. serotype typhimurium will have a turbid purple colour.

That’s not it. TM Media also provides you with various other water testing products for the analysis of water, like the Chromogenic Coliform Agar Plate (TMP 1858), which is ready to use.

To check our product list, click on the link

Learning XLD’s X, Y, and Z can be challenging, but not with us. In the previous article, we discussed the various needs and applications of XLD (click on the link if you haven’t read it). In this, we’ll talk more about its composition, principle, observations, and modifications.

What is the composition of XLD Agar?

It was developed by Welton Taylor in 1965. XLD stands for Xylose Lysine Deoxycholate Agar and is a bright pink or red-colored solid opalescent gel medium. Knowing its key contents will help you better understand its principles and differentiating abilities.

Ingredients g/l

Yeast Extract 3 g

L-lysine 5 g

Xylose 3.75 g

Lactose 7.5 g

Sucrose 7.5 g

Sodium Deoxycholate 1 g

Sodium Chloride 5 g

Sodium Thiosulfate 6.8 g

Ferric Ammonium Citrate 0.8 g

Phenol red 0.08 g

Agar 12.5 g

Distilled water 1 Litre

Yeast extract provides the medium with nutrients, vitamins, peptides, and other essential growth factors. Xylose, lactose, and sucrose are rich sources of fermentable carbohydrates. For the detection of fermentation of these carbs in the medium, a pH indicator, phenol red, is added. The addition of xylose to the medium accounts for the differentiation of various fermenting enteric bacteria from species of Shigella that do not ferment it. Most enteric pathogens, including Salmonella,can ferment xylose, which results in the formation of acidic byproducts and a change in the color of the medium from pink to yellow, whereas Shigella colonies remain red. In some cases, Salmonella imitates Shigella colonies and gives red colonies, which are then differentiated by the production of Hydrogen sulfide gas by the metabolism of thiosulfate and give black centers. Enterobacteria such as E. coli can ferment lactose in the medium.

XLD Agar’s composition can be adjusted according to one’s needs and choices and is hence available in many different variations, but the basic principle remains the same.

Observation and Inferences on XLD Agar:

Observation Inferences

Red colonies, some with black centers Salmonella spp.

Red colonies Shigella spp.

Yellow to orange colonies Coliforms

Pink, flat, and rough colonies Pseudomonas aeruginosa

While learning about XLD Agar, a question that must have run through your thoughts would’ve been, “Where is XLD Agar available?” Let’s look into it.

Where is XLD Agar available?

XLD Agar is available on the market as Dehydrated Culture Media in a number of variations according to one’s requirements, including plant-based and animal-based options.

These Dehydrated Culture Media can be dissolved in distilled water according to the concentration mentioned on the package, autoclaved, poured, and used.

TM Media, the microbiology division of Titan Biotech Ltd., offers a wide range of XLD Agar as Dehydrated Culture Media in a number of variations suitable for all your needs, operations, and specific requirements.

The product range includes the following:

XLD AGAR MODIFIED (as per ISO) TM 1621: XLD Agar, modified, is a selective and differential medium for the isolation of gram-negative enteric pathogens from clinical specimens or food products. It is a modification of the original formulation of Taylor that allows selective isolation of Salmonella typhi, E. coli, Salmonella enteritidis, Salmonella typhimurium, and Shigella flexneri. It is recommended by the ISO committee, and the composition and performance criteria of this medium are as per the specifications laid down in ISO 6579-1:2017.

XLD AGAR (VEG.) TMV 492: Xylose Lysine Deoxycholate Agar (Veg) is prepared by replacing Sodium Deoxycholate with synthetic detergent No.III, which makes the medium free of BSE/TSE risks. Xylose Lysine Deoxycholate Agar (Veg) is suitable for the isolation and identification of enteric pathogens from stool samples.

XLD AGAR (as per USP/EP/JP/BP) TMH 112: This medium is employed for pharmaceutical testing and non-sterile product testing for the detection of Salmonella after enrichment in Rappaport VassialidiasSalmonella Enrichment Broth in accordance with the harmonized method of USP/EP/BP/JP/IP.

XLD AGAR TM 1448: It is used for pharmaceutical testing and nonsterile product testing for the detection (or absence) of Salmonella after enrichment in Rappaport Vassialidias Salmonella Enrichment Broth in accordance with IP.

XLD AGAR TM 492: XLD Agar exhibits increased selectivity and sensitivity as compared to other plating media, e.g., SS Agar, EMB Agar, and Bismuth Sulphite Agar. The media formulation does not allow the overgrowth of other organisms over Salmonella and Shigella. Samples suspected of containing enteric pathogens, along with other mixed flora, are initially enriched in Modified Semisolid RV Medium Base.

Why choose TM Media’s XLD Agar?

TM Media’s superior-quality and diverse Microbiological Culture Media are certified by ISO, CE, GMP, FSSAI, and FSSC.

TM Media provides unrivaled convenience, dependability, and efficacy, as well as versatility and flexibility, by manufacturing a contamination-free medium with a longer shelf life and reproducible outcomes.

Conclusion:

XLD Agar is a selective and differential agar medium primarily used for the isolation and differentiation of different enteropathogenic organisms that are well-known to cause diseases like Food poisoning, Gastroenteritis, and other Digestive illnesses.

Testing a product for being sterile and free from microbes is an essential part of quality testing. Soybean Casein Digest Medium (TMH102), from TM Media, is your key to this. It's a versatile medium that nurtures fastidious and non-fastidious microorganisms, helping detect unwanted fungi and bacteria from samples. Let's dive into the magic of this medium.

The principle

Soybean Casein Digest Medium is a general-purpose medium that stands out due to its carefully balanced composition, tailor-made for the isolation and cultivation of fastidious and non-fastidious microorganisms in laboratories, making it fit to see even the smallest contamination in a sample. The foundation is the papaic digest of soybean meal and the pancreatic digest of casein. These ingredients not only make the medium nutrient-rich but also ensure a steady supply of amino acids and long-chain peptides, essential for microbial growth. Additionally, natural soybean sugars are added, which are like a treat for fastidious organisms. The dipotassium hydrogen phosphate serves as a reliable buffer, ensuring the pH remains stable, while sodium chloride upholds the osmotic balance. And of course, glucose is there, acting as the primary source of carbon that's fermentable.

Soybean Casein Digest Medium Roles:

TM Media’s Soybean Casein Digest Medium (TMH102) follows USP/EP/JP/BP/IP standards, making it extraordinary. It's widely used in the pharma industry as it's an unbeatable choice for microbial growth and sterility testing.

It is also used for sensitivity testing of antimicrobial agents, aids in diagnostic microbiology research, and is a sample diluent and suspending agent.

Composition of Soybean Casein Digest MediumSSS

Using Soybean Casein Digest Medium:

It is as simple as it gets!

Dissolve 30.00 grams in 1000 ml of distilled water.

Gently heat to dissolve the medium completely.

Pour into tubes or flasks as desired.

Autoclave at 15 psi (121°C) for 15 minutes. Filter if any fibres are observed in the solution.

Quality Control and Appearance:

The media is consistent, with a powdered form resembling creamy dessert or soft yellow snow. Once mixed, it turns a gentle light yellow with a consistent pH around 7.3.

Packaging and Storage:

TM Media makes this available in 100 and 500 g packs. Store in a cool, dry place, marked with the opening date. Seal tightly after use.

Picture this; a patient ate their favorite dish, and after a few hours they started to feel uneasy, with abdominal pain, nausea, vomiting, and diarrhoea.

But why is it happening with that patient?

They saved some portions of their favorite dish to eat later, and when they were just about to eat the leftovers, it didn’t have that same aroma. It smelled bad. But they didn't understand that someone else had secretly fed on it and eaten it. But this backstory is enough for you to understand that there was a bacterial party on the leftover food, and some of the enteric pathogenic goons may have arrived uninvited. They mingled, swapped genes, and caused chaos in the food.

Now it's your turn to identify the causative agent.

But how?

The diagnosis of a food infection or intoxication is done by testing blood and stool samples for the presence of any live microbes or any harmful substances produced by them.

In the wild world of microbiology, XLD Agar is the cool cat who helps you isolate the food-contaminating microbes. Let's take a closer look at this Microbial Sherlock and its quirky but effective methods.

Understanding XLD Agar:

XLD Agar is a selective and differential agar medium primarily used for the isolation and differentiation of different enteropathogenic organisms that are well-known to cause diseases like food poisoning, Gastroenteritis, and other Digestive illnesses. Have you ever heard of Salmonella, Shigella, or the very famous Escherichia coli? These organisms are pretty famous in the microbial world for causing very serious and sometimes fatal Foodborne diseases. These can be transmitted through contaminated food, water, or contact with an infected individual and are a potential threat to public health.

XLD Agar is the most powerful tool for the detection of gastric infections. It has a special ability to differentiate gastric infection-causing bacteria based on their characteristic biochemical nature.

Now that you know how remarkably efficient XLD is, let’s discuss its needs and applications.

Needs and Applications of XLD Agar

Detection of these bacteria in food before consumption can serve as a preventive measure for various foodborne illnesses. In light of XLD’s invaluable properties, it holds boundless utilitarianism in food, pharma, diagnostics, and research. Some of its applications are mentioned in detail below:

Food Microbiology: XLD is rightly the Spiderman of the Microverse. It holds immense potential and usability in food microbiology. As we talk about food, gastric illnesses such as bacterial infections resulting from the consumption of contaminated food are prevalent. Correct detection of these bacterial strains becomes pivotal in the prognosis. The most common fatal foodborne illnesses include Typhoid caused by Salmonella enterica serotype Typhi, Salmonellosis caused by different strains of Salmonella, Shigellosis caused by several species of Shigella such as Shigella sonnei, Shigella boydii,or Shigella dysenteriae.

These microorganisms aren’t only the reason for such fatal diseases but also the loss of a major portion of food through food spoilage.

Quality Control and Quality Assurance: QA or QC in the food, beverage, and pharmaceutical industries is important for safety and preventive measures. XLD plays a significant role in the detection of enteric bacteria in products during microbiological testing before they are released into the market for public consumption.

Environmental Microbiology: XLD Agar can be used for the analysis of water samples for such dangerous microbes as E. coli that can pose great danger if contaminated water is consumed.

Clinical Microbiology: The correct detection of bacterial strains becomes pivotal in the prognosis. The most common fatal foodborne illnesses include Typhoid, Peptic ulcers, Gastritis, etc.

TM Media, the microbiology division of Titan Biotech Ltd., offers XLD Agar along with other 2000 Dehydrated Culture Media for the isolation and identification of various microbes from food, pharmaceutical, clinical, and environmental samples. The XLD Agar is available in both powdered and prepared forms. Visit TM Media to know more about them.

Do you want to explore more about the composition, principles, and how to draw inferences from XLD Agar?

Chromogenic UTI Agar is a specialized laboratory medium designed for the presumptive identification of microorganisms primarily responsible for urinary tract infections (UTIs). This agar plays a crucial role in the accurate and rapid diagnosis of UTIs by helping microbiologists distinguish and identify potential pathogens.

The distinguishing feature of Chromogenic UTI Agar is its unique ability to produce distinct and easily distinguishable colors in response to the metabolic activity of specific microorganisms. Different chromogens integrated into the agar will generate various colors in the presence of particular bacterial enzymes. This coloration simplifies the identification process, as it allows for the visual recognition of the types of bacteria present in a sample.

Soya Casein Digest Agar

The Lactobacilli MRS medium is an adaptation of the deMan, Rogosa, and Sharpe formulation with slight modifications. It is designed to facilitate vigorous growth of various Lactobacilli strains, including those derived from the oral cavity, dairy products, foods, feces, and other sources. Lactobacilli are typically microaerophilic and typically require layer plates for aerobic cultivation on solid media. To create a layer plate, an additional layer of un-inoculated MRS Agar is poured over the surface once the medium is prepared. To confirm the presence of Lactobacilli isolated on MRS Agar, additional biochemical tests are required.

Soyatone-R is derived from the enzymatic digestion of casein, comprising a mixture of amino acids, including essential ones, and larger peptides. Casein, the primary milk protein, is abundant in amino acid nitrogen, with particularly high concentrations of Tryptophan. Tryptone, owing to its rich nutritional properties, is incorporated into media to expedite the growth of microorganisms, particularly in cases where rapid and robust microbial growth is desired. It is an integral component of the widely used LB Broth for cultivating recombinant Escherichia coli. Additionally, it serves as a valuable supplement for microbiological culture media, providing a nutritious hydrolysate for microbial growth.

MGYP agar, short for Malt Extract Glycerol Yeast Peptone Agar, is a specialized culture medium employed in the brewing industry for the isolation and cultivation of wild yeast strains. This medium provides a carefully balanced environment that supports the growth and propagation of wild yeast, which is crucial in various stages of the brewing process.

Pringsheim's Medium is a highly recommended culture medium specifically designed for the cultivation of blue-green algae. These remarkable organisms, with their unique ability to convert atmospheric nitrogen into organic forms like nitrate or ammonia, are essential for the health and growth of many plants. Blue-green algae encompass a wide range of species, though only a select few have been successfully cultured in artificial environments.

Notably, blue-green algae possess a distinctive blue-green color, attributed to the presence of the pigment phycocyanin in addition to chlorophyll. Certain blue-green algae feature specialized cells called heterocysts, which play a key role in nitrogen fixation. Pringsheim's Medium provides the ideal conditions for nurturing these valuable organisms.

Potato dextrose agar (PDA) is a nutrient medium that is recommended by APHA, FDA, USP, BP, EP, and JP for the growth of fungi. It is commonly used for plate counts of yeasts and molds in the examination of foods and dairy products. PDA can also be used to stimulate sporulation, maintain stock cultures of certain dermatophytes, and differentiate typical varieties of dermatophytes on the basis of pigment production.

PDA is made with potato extract and dextrose, which provide nutrients for fungal growth. The pH of the medium is adjusted to 3.5 with tartaric acid, which inhibits bacterial growth. It is important to avoid heating the medium after acidification, as this can hydrolyze the agar and prevent it from solidifying.

Nutrient broth serves as a fundamental culture medium for the sustenance of microorganisms. It is employed for cultivating both fastidious organisms, often enriched with serum or blood, and for preliminary purity assessments before engaging in biochemical or serological testing. Nutrient Broth adheres to the original formula designed for application in the Standard Method for Examination of Water and Wastewater. This medium is one among several non-selective options that find utility in the routine cultivation of microorganisms. It can be utilized for the growth and quantification of bacteria that do not have stringent nutritional requirements.

Blood Agar Base is a highly nutritious medium typically utilized as a fundamental medium for preparing blood agar by supplementing it with blood. Moreover, it can function as a general-purpose medium even without the addition of blood. Blood Agar Base can be customized by adding phenolphthalein phosphate for identifying phosphate-producing Staphylococci, salt and agar to assess surface contamination on equipment and pig carcasses, and to determine the salinity range of marine Flavobacteria. Additionally, it serves in the preparation of Salmonella Typhi antigens and is recommended by APHA and Standard Methods for testing food samples.

Chocolate agar, also known as chocolate blood agar (CBA), serves as a nonselective, nutrient-rich medium employed for the isolation of pathogenic bacteria. It is a variation of the traditional blood agar plate, containing red blood cells that have been lysed through gentle heating to 80°C. Chocolate agar is specifically used for the cultivation of demanding respiratory bacteria, such as Haemophilus influenzae and Neisseria meningitidis. Additionally, certain bacteria, notably H. influenzae, require growth factors like nicotinamide adenine dinucleotide (factor V or NAD) and hemin (factor X), which are present within red blood cells. Thus, the presence of red blood cell lysates is a prerequisite for the growth of these bacteria. The heat treatment also deactivates enzymes that could otherwise break down NAD.

Sabouraud Chloramphenicol Agar is employed to culture yeast and molds, specifically the parasitic fungi associated with skin and scalp conditions. Scientist "Sabouraud" originally developed this agar medium. It is frequently supplemented with antibiotics like Chloramphenicol when aiming to isolate pathogenic fungi from samples that contain a significant presence of both fungi and bacteria.

Polyvinyl Pyrrolidine K-25 (PVP) is a versatile compound with various functional applications. It serves as a clarifying agent, effectively improving the transparency and purity of various substances. PVP acts as a stabilizer, aiding in maintaining the stability and consistency of mixtures and solutions. Additionally, it functions as a bodying agent, enhancing the texture and thickness of certain products.

PVP is commonly utilized as a tableting adjunct in pharmaceuticals, where it assists in the cohesive binding of tablet ingredients, ensuring the integrity of the final product.

In the ever-growing world of Microbiology, Sheep Blood Agar is a tried and tested medium that can unravel the intricate details and diversity in the microbial world. In this article, we dive a little deeper into the details like composition, characteristics, applications, and significance of the medium and underline why one must switch to TM Media for their needs.

Introduction to Sheep Blood Agar:

Sheep Blood Agar is an enriched and differential medium used for the isolation, culturing, and detection of hemolytic activity of fastidious organisms by their ability to lyse RBCs. It is an opaque gel medium of cherry red color composed of pancreatic casein digest, peptone, yeast extract, and sodium chloride for osmoregulation of the bacterial cells. Enrichment of medium with 5% defibrinated sheep blood provides it with a rich supply of nutrients and amino acids, supporting the growth of an array of microorganisms such as Streptococcus pneumonia, Streptococcus pyogenes, and Staphylococcus aureus. But what are the actual needs and applications of Sheep Blood Agar?

Needs and Applications of Sheep Blood Agar:

Sheep Blood Agar is used as a primary growth support medium for a wide range of organisms in microbiology owing to its versatility. It is an imperative aid in microbiological laboratories for studying hemolytic patterns of different microbes for research purposes, identifying potent pathogens, and diagnostic screening in clinical laboratories. We can explore the multifaceted applications of Sheep Blood Agar on a very broad spectrum, from Clinical diagnosis of samples to quality control in the food and pharmaceutical industries. Some of these are listed below:

Diagnostic screening of clinical samples: Clinical laboratories deploy Sheep Blood Agar in testing samples suspected of different bacterial infections, for example, Urinary Tract Infection and Septicemia.   

Quality Control: Sheep Blood Agar is employed in various food and pharmaceutical laboratories to detect possible pathogenic microorganisms such as Staphylococci spp., Streptococci spp., and Listeria monocytogenes that may cause contamination and lethal diseases.

Microbiological Research: It is used by scientists in laboratories for examining and scrutinizing different samples, studying the hemolytic patterns of different microbes, and drawing inferences.

What is Sheep Blood Agar? How do we culture microorganisms on it?

Sheep Blood Agar Medium is made by dissolving certain nutrient-rich substances, organic and inorganic, in a fixed concentration. The medium is then enriched by adding a fixed amount of Sheep Blood to support the growth of fastidious organisms that have special needs for growth. Ingredients that are needed for the preparation of Sheep Blood Agar Medium are:

Casein enzymatic hydrolysate: It is obtained by the enzymatic hydrolysis of casein to amino acids and enriches the medium with amino acids for the growth of microbes.

Peptic digest of animal tissue: It acts as a source of Carbon and Nitrogen in the medium.

Yeast extract: It is a rich source of Vitamins, Amino acids, Minerals, and Growth factors.

Agar: It acts as a solidifying agent.

Sodium Chloride: It is added for osmoregulation of the microbial cells.

Sheep Blood: It is added to enrich the medium, and to support the growth of fastidious organisms.

Dehydrated Culture Media and Ready-to-Use Culture Media:

Sheep Blood Agar Medium is available in the market as Dehydrated Culture Media as well as Ready-to-Use Culture Medium Plates. Dehydrated Culture Media need manual preparation before use, whereas Ready-to-Use Culture Medium Plates are already prepared and sterilized. They can be used immediately, thus saving time, resources, and energy.

The choice of type of Culture Media depends on whether you want to prepare it yourself or use it directly, respectively.

The composition for the preparation of Sheep Blood Agar from Media bases and supplements is as mentioned below:

Composition of Sheep Blood Agar

Ingredients Gms/Ltr

Casein enzymatic hydrolysate 14.00

Agar 12.50

Sodium chloride 5.00

Peptic digest of animal tissue 4.50

Yeast extract 4.50

Sheep Blood 50.00 ml

Characteristic features of Sheep Blood Agar

Sheep Blood Agar Plates shall be stored at a temperature between 2-8 degrees Celsius to avoid desiccation.

Plates should not be refrozen and thawed repeatedly and allowed to warm to room temperature before inoculation.

Sheep Blood Agar doesn’t support the growth of Haemophilus species due to the absence of factor “V” until provided by any other species, such as Staphylococci.

Adding a small amount of reducing sugars can inhibit the manifestation of beta-hemolytic activity in some organisms.

Different Streptococci species produce different zones on Sheep Blood Agar, including an alpha-hemolytic zone, a beta-hemolytic zone, a green zone, or even no zone at all.

How to draw inferences on hemolytic patterns and study colony characteristics on Sheep Blood Agar Plates?

Alpha hemolysis:

Alpha hemolytic patterns on a Sheep Blood Agar Plate show partial hemolysis of the RBCs from the blood and result in greenish or brownish discoloration of the agar medium.

Beta hemolysis:

Beta hemolytic patterns on a Sheep Blood Agar Plate show complete hemolysis and result in the formation of a Clear Zone or Halo around the bacterial colonies.

Gamma hemolysis:

Gamma hemolytic patterns on a Sheep Blood Agar Plate infer no hemolytic activity on the plate.

After this detailed dialogue on Sheep Blood Agar Plates, let’s see where we can get it from.

TM Media, the microbiology division of Titan Biotech Ltd., is one of the reputed manufacturers of different Culture Media including Sheep Blood Agar Ready-to-Use Plates to save time and energy from tedious media preparation procedures.

Why choose TM Media’s Sheep Blood Agar Plates?

TM Media is one of the most prominent and distinguished manufacturers of a top-notch and vast assortment of Microbiological Culture Media that are certified by ISO 13485:2016, ISO 11133:2014, ISO 9001:2015, CE, GMP, FSSAI, and FSSC.

TM Media’s Ready-to-Use Culture Media Plates are an easy microbiology solution for all laboratories for the direct isolation of microbes. TM Media offers unparalleled convenience, reliability, efficiency, meticulous packaging, extensive quality, and sterility testing, guaranteeing a contamination-free medium with elite and reproducible results.

Sheep Blood Agar Plates are available in 90-mm size and are specially designed for clinical diagnostic purposes.

Conclusion:

Sheep Blood Agar is an indispensable tool in Microbiology for studying hemolytic patterns as well as culturing a wide range of organisms, primarily hemolytic and non-hemolytic bacteria as well as certain fungal species such as Candida spp., Aspergillus spp., etc.