Food, Water & Environmental Bottled & Bagged Media List
Bottled & Bagged ready to use culture media for the food, water and environmental microbiological testing laboratories: Broths, agars and diluents are dispensed into various containers and volumes using both manual and fully automated microbiology laboratory equipment production lines. An extensive range of containers/volumes and microbiological media formulations are on offer to meet your individual requirements.
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Alkaline Peptone Water is generally used as an enrichment medium in the isolation of Vibrio spp. from faeces. The high pH of the medium inhibits most enteric organisms for at least 24 hours. The medium is heavily inoculated with faeces and after not more than 8 hours incubation a loopful from the top of the medium is sub cultured onto TCBS Agar. This enrichment medium is also used for food and water testing.
Bile Aesculin Medium is generally used for the differentiation and presumptive identification of Group D streptococci (enterococci). Enterococci hydrolyse aesculin forming, amongst other products, aesculetin which in turn combines with Ferric ammonium citrate producing a dark brown or black complex. The presence of Bile salts in the medium inhibits gram positive organisms other than enterococci. The medium can also be used for the presumptive identification of certain organisms within the Enterobacteriaceae group such as Klebsiella spp., Enterobacter spp., etc.
This medium is used to detect and/or confirm the presence of coli-aerogenes group of organisms in water, food and dairy laboratories. Bile and Brilliant Green are included in the medium to inhibit gram positive organisms while the coli-aerogenes organisms are identified by the formation of gas during the fermentation of Lactose. The medium can also be used for the confirmation of Escherichia coli by incubating at 44°C.Enterobacteriaceae Enrichment Broth E.E. Broth is recommended as an enrichment medium when examining food and feedstuffs for Enterobacteriaceae. It is a modification of Brilliant Green Bile Broth, with an improved buffering capacity to encourage early growth and prevent autosterilization. E.E. Broth uses glucose instead of lactose to make the medium a test for all enterobacteria including non lactose fermenting organisms.A very nutritious isotonic general purpose medium with a low concentration of Glucose to stimulate early growth, Brain Heart Infusion Broth is suitable for the isolation of most micro-organisms including many fastidious organisms and, with enrichment as appropriate, is suitable as a base for blood culture medium. A phosphate buffer is incorporated to help neutralise any acids produced as a result of Glucose utilisation and thus maintain viability of the organisms. NB: Organisms that produce large amounts of acid in the medium may overwhelm the buffering system and as a result ‘auto-sterilise’ the culture.A pre-enrichment medium designed to help sub-lethally damaged Salmonella spp. recover before introducing them into a selective medium. This non-selective, nutritious medium is free from inhibitors and is well buffered to maintain the pH at 7.0 for the incubation period according to ISO 6579 (2002). ≤A pre-enrichment medium design to help sub-lethally damaged Salmonella spp. recover before introducing them into a selective medium. This nutrient medium is free from inhibitors and is well buffered to maintain the pH at 7.2 for the incubation period.Columbia Agar is a nutritious general-purpose basal medium capable of supporting the growth of most micro-organisms, including many fastidious organisms that do not require blood. However when further enriched with Sterile Blood, which can be “chocolated” if required, the medium is generally used for the isolation of most clinically significant pathogens. The medium can be made selective for various groups of organisms by the addition of a range of antimicrobial supplements. This formulation complies with the Harmonized USP/EP/JP.This is an enrichment broth for the isolation of Yesinia enterocolitica. The medium is produced in accordance with the Drinking Water Inspectorate part 10 and the Health Protection Agency and is suitable for use for both water and faecal samples.Prepared from Minced Meat granules overlaid with Brain Heart Infusion Broth this medium is suitable for recovery, isolation and storage of the most fastidious anaerobes as well as many aerobes.A sterile concentrated emulsion of premium egg yolks, suitable for incorporation in culture media which detect lecithinase production by bacteria. It can be used in media for Bacillus cereus and Staphylococci. Used with serum and Filde’s extract it may be used to produce Nagler plates for Clostridia.Originally intended for use in surface counting and pour plating techniques this medium can be used as a general purpose medium for the cultivation of most organisms particularly those that are less fastidious in their nutritional requirements. Can also be used as a maintenance medium for stock cultures.Traditionally, standard methods for enumeration of heterotrophic bacteria in water have used nutritionally rich media with incubation at 35°C. This may represent only a small percentage of bacteria present in the sample. R2A agar is a nutritionally reduced medium which, when combined with incubation at lower temperatures for longer time periods, results in enhanced recovery of stressed and chlorine damaged organisms from treated waters resulting in higher more realistic bacterial counts.This medium can be used as a screening method for the differentiation of Enterobacteriaceae based on the ability of some species to utilise citrate as a sole source of carbon. It is often used as a screening test for Klebsiella pneumoniae (Positive reaction) while Escherichia coli is negative. Other uses included distinguishing between species of citrate positive Salmonellae (e.g. Salmonella enteritidis) and those that are negative (e.g. Salmonella typhi and Salmonella paratyphi A). The medium is inoculated by stabbing the organism (in pure culture) into the medium. A positive result produces a change of colour from green to bright blue and a negative reaction leaves the colour unchanged.A general-purpose medium that can be used as a base for carbohydrate fermentation media. It has a high level of Tryptone and is therefore also suitable for use in Indole testing.An osmotically controlled solution for the preparation of suspensions of food samples and for use as a diluent in dilution techniques for bacterial enumeration. The solution may also be used in the sampling of food production apparatus by the rinse and swab method.An osmotically controlled solution for the preparation of suspensions of food samples and for use as a diluent in dilution techniques for bacterial enumeration. The solution may also be used in the sampling of food production apparatus by the rinse and swab method.Rappaport Vassiliadis (R.V.) Single Component Enrichment Broth This is an alternative to Selenite and Tetrathionate broths, as a selective enrichment broth for the isolation of Salmonellae spp from food, dairy and environmental samples and is claimed by some workers to be superior to both these formulations. It can also be used in clinical bacteriology but care must be taken to ensure that only a light inoculum is used. Malachite Green and Magnesium Chloride are included in the formulation as selective agents due to their ability to inhibit most enteric organisms but allow salmonellae to multiply freely. NB: This media is not recommended for use when salmonella typhi is suspected.A medium for the selective enrichment of Salmonellae spp from both clinical and food samples. It is a buffered Lactose Peptone Broth to which Sodium Biselenite is added as the selective agent and Cystine to enhance the recovery of salmonella in low numbers. Subcultures should be made from the top 1/3 of the broth after not more than 24 hours incubation as after this time there is a loss of selectivity.Sterile Isotonic Saline suitable for use in preparation of food samples and/or as a rinse during examination of equipment etc. prior to culture. It can also be used as a general purpose diluent in many areas of the laboratory.Universal Isotonic Saline Solution.Isotonic Saline with added 0.1% Tryptone suitable for use in the preparation of food samples prior to culture.This is a medium that can be used to differentiate between some of the Enterobacteriacae on the basis of four reactions, fermentation of Lactose, Glucose and Sucrose and the production of H2S. For use the medium is inoculated using a pure culture of the test organism which should be smeared onto the surface of the slope and stabbed into the butt of the medium. For details of the many reactions that may arise during the use of this medium reference should be made to one of the many standard textbooks.Based on Christensen’s Medium this medium is generally used to detect rapid urease activity of Proteus spp although it can be used to detect urease activity of other Enterobacteriaceae. When used for the later purpose it is necessary to increase the incubation time to as long as 48 hours.A modification of Christensen’s Medium by Maslen this medium is generally used to detect rapid Urease activity of Proteus spp although it can be used to detect Urease activity of other Enterobacteriaceae including Urease producing Salmonella and Shigella. Unlike Christensen’s Medium when used for the later purpose it is not necessary to increase the incubation time.Originally intended for use in surface counting and pour plating techniques in food and dairy products this medium can be used as a general-purpose medium for the cultivation of most non-fastidious organisms.Based on Nutrient Broth with an additional 6.5% Sodium Chloride (Total Sodium Chloride content = 7%) this medium is suitable for use in the investigation of outbreaks involving Staphylococcus aureus including MRSA. The additional Sodium Chloride inhibits most other organisms allowing the staphylococci to multiply freely even if present in small numbers. The medium is generally used as an enrichment medium in conjunction with subculture onto selective solid media.This is a sterile emulsion of Egg Yolk in Saline containing Potassium Tellurite and is generally used as a selective differential agent in Baird Parker Medium. The complete medium is selective for Staphylococcus aureus as the Potassium Tellurite inhibits most coliform organisms and is also reduced by Staphylococcus aureus to tellurite giving typical black colonies on the Baird Parker Medium.Recent developments in culture media have given rise to the use of chromogenic substrates as a means of differentiating bacteria particularly among the coliform group of organisms. This is one such medium and has been developed primarily as a selective medium for the isolation and enumeration of Escherichia coli in food samples. Based on Tryptone Bile Agar it incorporates the chromogenic agent X-glucuronide, which detects glucuronidase activity, the same enzyme as is detected by MUG reagent. Escherichia coli can be differentiated from other coliform organisms by the presence of glucuronidase resulting in the colonies being blue/green while the other coliforms are colourless. For information on the full technical detail as to the functionality of this medium reference should be made to the many publications available.A general purpose medium for the cultivation of organisms that are less fastidious in their nutritional requirements. This particular formulation has additional 0.2% Agar added to provide for a firmer medium without loss of efficacy. Generally used to maintain cultures or to check the purity of subcultures from isolation media.A general-purpose medium for the cultivation of organisms that are less fastidious in their nutritional requirements.Tryptone Water is an alternative medium to Peptone Water and more reliable for the testing of Indole production. The medium has a high content of Tryptophan that many organisms, particularly coliforms, break down to form Indole. After incubation add a few drops of Indole reagent to determine the Indole reaction (Red colour is Positive).A modification of UVM Medium, Fraser Broth is a secondary selective enrichment broth for the isolation of Listeria spp primarily from food and environmental specimens. The medium is made selective by the inclusion of Nalidixic Acid and Acriflavine. Darkening of the broth following incubation, due to the presence of Aesculin and Ferric Ammonium Citrate, is indicative of the presence of Listeria spp. Lithium Chloride is also included to inhibit the growth of enterococci that would otherwise hydrolyse the Aesculin. This medium is generally used in conjunction with Fraser Broth Half-Strength (BM0647). NB: It should be noted that the lack of darkening of the broth should not be taken as a final negative result and all Fraser Broth enrichment cultures should be sub-cultured onto an appropriate selective agar medium irrespective of colour.A modification of UVM11 Medium, Fraser Broth Half-Strength is a primary selective enrichment broth for the isolation of Listeria spp. from food and environmental samples and is generally used in conjunction with Fraser Broth (BM0640). Although the base is identical to Fraser Broth it differs in that it contains only half the quantity of selective agents (Nalidixic acid and Acriflavine).All E&O products are for in vitro use only. E&O products are intended only for use by qualified professionals who will safely handle and dispose of products they receive. All biologically derived materials (e.g. blood, sera) should be handled as if a potential biohazard. E&O media that contain antibiotics should be handled with care. Chemical resistant gloves, eye protection and laboratory coat should be worn.All E&O products are for in vitro use only. E&O products are intended only for use by qualified professionals who will safely handle and dispose of products they receive. All biologically derived materials (e.g. blood, sera) should be handled as if a potential biohazard. E&O media that contain antibiotics should be handled with care. Chemical resistant gloves, eye protection and laboratory coat should be worn.Maximum Recovery Diluent (Peptone/ Saline Diluent) An osmotically controlled solution for the preparations of suspensions of food samples and for use as a diluent in dilution techniques for bacterial enumeration. The presence of a low level peptone lessens the physiological shock normally experienced by bacterial cells when they are introduced to a diluent such as Ringers Solution. The level of peptone is such that multiplication of the organisms is not possible in the time in which the sample will be present in the diluent.For the enumeration of Escherichia coli and coliform organisms in water using a Membrane Filtration Technique. Previously known as Membrane Enriched Teepol Broth, Lauryl Sulphate has replaced Teepol 610, which is no longer available. Phenol Red is included in the medium making it possible for coliforms to be more readily detected following incubation.This is a modification of the traditional liquid media used to differentiate and identify micro-organisms. It consists of a Buffered Tryptose base containing Lactose and solidified with Gelatin which permits detection of Gelatin Liquefaction where appropriate. Phenol Red Indicator is also included as an indicator of pH change.This is one of the large group of media, affectionately known as ‘Peptone Water Sugars’, that are generally used in the screening and/or identification of organisms particularly the enterobacteriacae. A positive fermentation of the substrate is clearly indicated by the medium turning pink due to the inclusion Andrade’s Indicator.Tetrathonate broth is a selective enrichment broth for the isolation of Salmonella spp. primarily from food and food samples. It can however be used in other applications including for clinical and environmental specimen testing. Salmonella spp. can reduce Tetrathionate and will proliferate in the medium whilst most other enteric organisms are inhibited. Immediately prior to use it is necessary to add 2% Iodine Solution (BM0946 - Supplied with the medium). Once the Iodine Solution has been added the medium should be used immediately and cannot be stored for future use. NB: As this is an opaque medium, turbidity cannot be used as an indication of growth.This is a selective enrichment broth for the isolation of Salmonella spp. primarily from food and food product samples and conforms to the requirements ISO 6579:2002. It can however be used in other areas including clinical and environmental specimens. Salmonella reduce Tetrathionate and will proliferate in the medium whilst most other enteric organisms are inhibited. Unlike the older traditional Tetrathionate Broth the addition of Novobiocin (40mg/L) improves the inhibition of Proteus spp. Immediately prior to use it is necessary to add 200µl of 2% Iodine/Iodide Solution (BM0946 - Supplied with the medium). Once the Iodine/Iodide Solution has been added the medium should be used immediately and cannot be stored for future use. NB: As this is an opaque medium, the turbidity of the broth alone cannot be used as an indication of growth.This is a chemical complex which should be used in conjunction with BM0945 Muller – Kauffmann Tetrathionate Broth Base. It is recommended that the complex is used as a 2% solution with the base media and should be only added on the day of use.This is a selective enrichment broth for the isolation of Salmonellae spp. primarily from food and food product samples and conforms to the requirements as described in ISO 6579:2002. It can however be used in other areas including for clinical and environmental specimens. Salmonella reduce Tetrathionate and will proliferate in the medium whilst most other enteric organisms are inhibited. Unlike the older traditional Tetrathionate Broth the addition of Novobiocin (40mg/L) improves the inhibition of Proteus spp. This complete medium already includes the 2% Iodine solution that is traditionally added immediately before use. NB: As this is an opaque medium turbidity cannot be used as an indication of growth.A modification of Violet Red Bile agar designed to give a ‘coliform’ count. In this medium lactose is substituted with glucose. Glucose is fermented by all members of the Enterobacteriaceae thus V.R.B.G.A gives a presumptive Enterobacteriaceae count. Bile salts and crystal violet are used to inhibit Gram positive and non-enteric organisms. The growth of non-fermentative Gram negative bacteria can be suppressed by using the agar overlay method.This is a semi-solid medium suitable for the recovery and isolation of Clostridium spp from most types of sample, particularly when the organisms may only be present in small numbers. L-Cysteine Hydrochloride and Glucose are included as reducing agents and a small amount of agar is added to reduce Oxygen diffusion within the medium. Although this formulation, as presented, is non-selective it can be made suitable for the differentiation of sulphite reducing clostridia in water by the addition of sterile solutions of Sodium Sulphite and Ferric Citrate immediately prior to use. For full details of this procedure reference should be made to appropriate literature.Glucose agar allows for the detection of glucose fermentation (with or without gas production) as an identification test for Enterobacteriaceae (ISO 21528) and B.cereus (ISO 7932). It is further enriched by the addition of Yeast Extract. Bromocresol Purple is also included and acts as an indicator of glucose fermentation.This is a modified Cameron Sulphite Agar with a reduced concentration of sodium sulphite from 0.1% to 0.05% to allow the growth of the more sulphite sensitive strains of clostridia. A positive result is indicated by distinct black growth throughout the media, however, this blackening is only presumptive evidence of clostridial growth. Confirmation tests must be carried out to identify the organism growing on the medium.Based on the formulation of Dulbecco Solution ‘A’ this balanced salt solution is intended for use primarily in Tissue Culture techniques. It can be used either on its own or with the addition of Calcium and Magnesium salts (Dulbecco Solution B).This is a general-purpose medium supporting a wide range of organisms. It conforms to the requirements of the United States Pharmacopeia for sterility testing of pharmaceutical products as well as being suitable in all areas of bacteriological investigation.