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Media for Optimal Cell Growth and Yield of
Escherichia Coli Cultures

LB Media (Luria-Bertani) are common bacterial growth media for Escherichia Coli.

Although already described in the fifties in the early days of phage genetics these media are still widely used in molecular biology.

The two main components of LB media are Tryptone and Yeast Extract.  Tryptone is used in a concentration of 10 gram / litre and Yeast Extract in a concentration of 5 gram / litre.  Many variations of LB medium only differs in the concentration of NaCl.  All LB-Media are listed in order of increasing concentration of NaCl.

LB Medium Miller is the High Salt LB medium type with 10 gram /litre whereas LB Medium Lennox is the Low Salt LB medium type with 5 gram / litre.  L-Broth only contain 0.5 gram of NaCl per litre and is used mainly when working with phage P1 where CaCl2 is added for efficient adherence of the phage to the cell.  In LBM media Mg2+ is added to enhance adsorption of phage lambda to the cells.  Tryptone and Yeast Extract do not contain enough Mg2+ for optimal adsorption.

Many synonymous names are know for several different type of LB media.  We have tried to rank them all.

In case a medium cannot be found please also look at the synonymous names.

Tryptone broth is a moderately rich medium for growth and cultivation of Escherichia Coli.

Terrific Broth is a rich medium compared to LB and Tryptone Media. The medium is developed for higher density growth of Escherichia Coli cells and higher yield of plasmid DNA compared to LB and Tryptone broth.

Super Broth is an even richer medium developed for obtaining high yields of lambda bacteriophage in liquid lysates, Botstein, D. et al.
 

Powdered Media Storage and Preparation

Ready made powdered media are hygroscopic and must be protected from atmospheric moisture.  Always reseal tightly after opening.

Store the medium dry at room temperature.

Preparing media in a concentrated form is not recommended.  Some salt and protein complexes may precipitate in a concentrated solution.

Sterilise the medium in a validated autoclave at 1 kg/cm2 (15 psi) at 121°C. for 15 minutes.  Higher temperatures or exceeding the period of time for autoclavation may cause a  brown decolourisation of the medium due to caramelisation of the glucose present in the medium.  Denaturising of proteins may occur as well.  Both will result in poor cell growth.

References:
Botstein, D. et al, Mol. Biol., 91, 439, (1975)
Lennox, E.S., Virology, 1, 190, (1955).
Luria, S.E. and Burrous, J.W., J. Bacteriol. 74, 471, (1957).
Luria, S.E. et al., Virology, 12, 348, (1960).
Blattner, F., et al. Science, 196, 161, (1977).
Miller, J.H., Experiments in Molecular Genetics, C.S.H.   Press, N.Y., (1972)

  • LB Broth w/o NaCl

    $21.31$438.50
    SKU Pack Size Price
    LBO0101 250g $21.31
    LBO0103 6 x 1kg $438.50
    LBO0102 1000g $79.52
    Select options
    Formula
    g/l
    Tryptone 10
    Yeast extract 5
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 15 gram powdered medium in 1 litre distilled water Store dry at room temperature
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  • LB Agar w/o NaCl

    $24.08$515.25
    SKU Pack Size Price
    LBO0201 250g $24.08
    LBO0203 6 x 1kg $515.25
    LBO0202 1000g $93.38
    Select options
    Formula
    g/l
    Tryptone 10
    Yeast extract 5
    Agar 15
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 30 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • L-Broth

    $22.70$317.91
    SKU Pack Size Price
    LBL0101 250g $22.70
    LBL0103 6 x 1kg $317.91
    LBL0102 1000g $58.21
    Luria Broth Base (Miller�s Modification)
    Luria Broth Base or L-Broth is based upon the Luria Broth formulation as originally developed by Miller for cultivation and maintenance of E. coli cells in molecular biology. L-Broth is a nutritionally rich medium originally developed for growth and maintenance of recombinant E. coli strains. E. coli is grown to late log phase in LB Broth. These strains are generally derived from E. coli K12 which are deficient in B vitamin production. K12 has been ultimately modified by specific mutation into an auxothropic strain not capable of growth on nutritionally deficient medium. All nutritional requirements of E. coli strains are provided by LB Broth. Peptides and amino acids are abundantly present in Tryptone. Yeast extract is a rich source of amino acids, vitamins, nucleotides and carbohydrates. These nutritional elements in LB media, which otherwise the cell would have to synthesize, support a luxurious growth of E. coli cells. Sodium ions for transport and osmotic balance are provided by Sodium chloride. The concentration of NaCl in L-Broth is low compared to both LB Miller and LB Lennox formulations, respectively 10% and 5% of the NaCl concentration is present in both formulations. These variations in Sodium chloride content make it possible to select the optimal salt concentration for a specific strain. Miller, J.H., Experiments in molecular genetics, Cold Spring harbour Laboratory, Cold Spring harbour, New York, (1972). Lennox, E.S., Transuction of linked genetic characters of the host by bacteripphage P1, 1, 190-206, (1955). Sambrook, J,., E. F. Fritsch, and T. Maniatis, 1989, Molecular cloning: a laboratory manual, 2nd edition ed., Cold Spring Harbour laboratory, Cold Spring Harbour, N.Y.
    Select options
    Formula
    g/l
    Tryptone 10
    Yeast extract 5
    NaCl 0.5
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 15.5 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • L-Broth Agar

    $24.08$515.25
    SKU Pack Size Price
    LBL0201 250g $24.08
    LBL0203 6 x 1kg $515.25
    LBL0202 1000g $93.90
    Luria Agar Base (Miller's Modification)
    Select options
    Formula
    g/l
    Tryptone 10
    Yeast extract 5
    NaCl 0.5
    Agar 15
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 30.5 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • L-Broth Top Agar

    $27.89$95.29
    SKU Pack Size Price
    LBL0301 250g $27.89
    LBL0302 1000g $95.29
    Select options
    Formula
    g/l
    Tryptone 10
    Yeast extract 5
    NaCl 0.5
    Agar 7
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 22.5 gram powdered medium in 1 litre distilled water Store dry at room temperature
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  • LB-Broth Lennox

    $3.98$260.57
    SKU Pack Size Price
    LBX0102 1kg $55.61
    LBX0103 6 x 1kg $260.57
    LBX1L 1 Litre pack $3.98
    LBX2L 2 Litre pack $6.41
    LBX5L 5 Litre pack $9.18
    LBX10L 10L pack $15.94
    LBX20L 20 Litre pack $25.47
    LBX0104 500g $30.49
    LBX0101 250g $16.81
    LB-Broth Low Salt, Lennox L Broth

    LB Broth Lennox is a nutritionally rich medium originally developed for growth and maintenance of recombinant E. coli strains. E. coli is grown to late log phase in LB Broth. These strains are generally derived from E. coli K12 which are deficient in B vitamin production. K12 has been ultimately modified by specific mutation into an auxothropic strain not capable of growth on nutritionally deficient medium. All nutritional requirements of E. coli strains are provided by LB Broth. Peptides and amino acids are abundantly present in Tryptone. Yeast extract is a rich source of amino acids, vitamins, nucleotides and carbohydrates. These nutritional elements in LB media, which otherwise the cell would have to synthesize,  support a luxurious growth of E. coli cells.

    Sodium ions for transport and osmotic balance are provided by Sodium chloride. The concentration of NaCl in LB Lennox is half the concentration of the LB Miller Broth formulation and ten times the concentration of LB Luria Broth formulation. These variations in Sodium chloride content make it possible to select the optimal salt concentration for a specific strain.

    Lennox, E.S., Transuction of linked genetic characters of the host by bacteripphage P1, 1, 190-206, (1955).
    Assubel, F.M., R. Brent, R.E. Kingston, D.D. Moore, J.G. Seidman, J.A. Smith and K. Struhl, Current protocols in molecular biology, vol. 1, Current Protocols, New York, (1994).

    Select options
    Formula
    g/l
    Tryptone 10
    Yeast extract 5
    NaCl 5
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 20 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • LB-Agar Lennox

    $4.33$311.50
    SKU Pack Size Price
    LBXA1L 1 Litre pack $4.33
    LBXA20L 20 Litre pack $40.89
    LBX0201 250g $16.98
    LBXA2L 2 Litre pack $6.58
    LBXA5L 5 Litre pack $12.82
    LBX0203 6 x 1kg $311.50
    LBXA10L 10L pack $21.83
    LBX0202 1000g $57.87
    LB-Agar Low Salt, Lennox L Agar
    Select options
    Formula
    g/l
    Tryptone 10
    Yeast extract 5
    NaCl 5
    Agar 15
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 35 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • LB-Top Agar Lennox

    $16.46$302.32
    SKU Pack Size Price
    LBX0301 250g $16.46
    LBX0303 6 x 1kg $302.32
    LBX0302 1000g $55.96
    LB-Top Agar Low Salt, Lennox L
    Select options
    Formula
    g/l
    Tryptone 10
    Yeast extract 5
    NaCl 5
    Agar 7
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 27 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • LBM-Broth Lennox

    $16.11$252.95
    SKU Pack Size Price
    LXM0101 250g $16.11
    LXM0103 6 x 1kg $252.95
    LXM0102 1000g $54.05
    LBM-Broth Low Salt
    For propagation of of lambda phages in Escherichia coli. In LBM media Mg2 is added to enhance adsorbtion of phage lambda to the cells. Tryptone and Yeast extract do not contain enough Mg2 for optimal adsorption.
    Select options
    Formula
    g/l
    Tryptone 10
    Yeast extract 5
    NaCl 5
    MgSO4 anhydrous 0.98
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 21 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • LBM-Agar Lennox

    $16.46$302.32
    SKU Pack Size Price
    LXM0201 250g $16.46
    LXM0203 6 x 1kg $302.32
    LXM0202 1000g $55.96
    LBM-Agar Low Salt
    For propagation of of lambda phages in Escherichia coli. In LBM media Mg2 is added to enhance adsorbtion of phage lambda to the cells. Tryptone and Yeast extract do not contain enough Mg2 for optimal adsorption.
    Select options
    Formula
    g/l
    Tryptone 10
    Yeast extract 5
    NaCl 5
    MgSO4 anhydrous 0.98
    Agar 15
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 36 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • LB-Broth Miller

    $3.98$289.33
    SKU Pack Size Price
    LMM10L 10 Litre pack - 250g $18.54
    LMM1L 1 Litre pack - 25g $3.98
    LMM20L 20 Litre pack - 500g $34.65
    LMM0101 250g $18.54
    LMM2L 2 Litre pack - 50g $5.54
    LMM5L 5 Litre pack - 125 gram $10.91
    LMM0103 6 x 1kg $289.33
    LMM0104 500g $34.65
    LMM0105 1500g $81.95
    LMM0102 1000g $57.52
    LB-Broth High Salt, Miller's LB Broth, Luria Broth
    LB Broth Miller is a nutritionally rich medium originally developed for growth and maintenance of recombinant E. coli strains. E. coli is grown to late log phase in LB Broth. These strains are generally derived from E. coli K12 which are deficient in B vitamin production. K12 has been ultimately modified by specific mutation into an auxothropic strain not capable of growth on nutritionally deficient medium. All nutritional requirements of E. coli strains are provided by LB Broth. Peptides and amino acids are abundantly present in Tryptone. Yeast extract is a rich source of amino acids, vitamins, nucleotides and carbohydrates. These nutritional elements in LB media, which otherwise the cell would have to synthesize,  support a luxurious growth of E. coli cells. Sodium ions for transport and osmotic balance are provided by Sodium chloride. The concentration of NaCl in LB Miller is twice the concentration of the LB Lennox Broth formulation and twenty times the concentration of LB Luria Broth formulation. These variations in Sodium chloride content make it possible to select the optimal salt concentration for a specific strain. Luria, S.E. and J.W. Burrous, Hybridization between Escherich coli and Shigella, J. Bacteriol., 74, 461-476. 1955. Luria, S.E., J.N. Adams and R.C. Ting, Transduction of lactose-utilizing ability amongst strains of E. coli and S. dysenteria and the properties of transducing phage particles, Virology, 12, 348-390, 1960. Lennox, E.S., Transuction of linked genetic characters of the host by bacteripphage P1, 1, 190-206, (1955). Sambrook, J,., E. F. Fritsch, and T. Maniatis, 1989, Molecular cloning: a laboratory manual, 2nd edition ed., Cold Spring Harbour laboratory, Cold Spring Harbour, N.Y. Assubel, F.M., R. Brent, R.E. Kingston, D.D. Moore, J.G. Seidman, J.A. Smith and K. Struhl, Current protocols in molecular biology, vol. 1, Current Protocols, New York, (1994).
    Select options
    Formula
    g/l
    Tryptone 10
    Yeast extract 5
    NaCl 10
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 25 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • LB-Agar Miller

    $5.02$413.37
    SKU Pack Size Price
    LMM02-10L 10L pack $32.74
    LMM02-1L 1 Litre pack $5.02
    LMM02-20L 20 Litre pack $61.85
    LMM0201 250g $24.08
    LMM02-2L 2 Litre pack $7.62
    LMM02-5L 5 Litre pack $17.84
    LMM0203 6 x 1kg $413.37
    LMM0204 500g $44.01
    LMM0202 1000g $76.40
    LB-Agar High Salt, Miller's LB Broth, Luria Agar
    Select options
    Formula
    g/l
    Tryptone 10
    Yeast extract 5
    NaCl 10
    Agar 15
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 40 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • LB-Top Agar Miller

    $25.12$80.21
    SKU Pack Size Price
    LMM0302 1000g $80.21
    LMM0301 250g $25.12
    Select options
    Formula
    g/l
    Tryptone 10
    Yeast extract 5
    NaCl 10
    Agar 7
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 32 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • LBM-Broth Miller

    $18.54$311.33
    SKU Pack Size Price
    LMG0101 250g $18.54
    LMG0103 6 x 1kg $311.33
    LMG0102 1000g $57.69
    LBM-Broth High Salt
    In LBM media Mg2 is added to enhance adsorption of phage lambda to the cells. Tryptone and Yeast extract do not contain enough Mg2 for optimal adsorption.
    Select options
    Formula
    g/l
    Tryptone 10
    Yeast extract 5
    NaCl 10
    MgSO4. anhydrous 0.98
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 26 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • LBM-Agar Miller

    $24.95$433.99
    SKU Pack Size Price
    LMG0201 250g $24.95
    LMG0203 6 x 1kg $433.99
    LMG0202 1000g $80.21
    LBM-Agar Low Salt
    In LBM media Mg2 is added to enhance adsorbtion of phage lambda to the cells. Tryptone and Yeast extract do not contain enough Mg2 for optimal adsorption.
    Select options
    Formula
    g/l
    Tryptone 10
    Yeast extract 5
    NaCl 10
    MgSO4. anhydrous 0.98
    Agar 15
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 41 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • 2X LB-Broth

    $13.69$284.13
    SKU Pack Size Price
    LBD0101 250g $13.69
    LBD0103 6 x 1kg $284.13
    LBD0102 1000g $52.84
    For maintenance and propagation of Escherichia coli.
    Select options
    Formula
    g/l
    Tryptone 20
    Yeast extract 15
    NaCl 20
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 55 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • 2X LB-Agar

    $16.46$343.90
    SKU Pack Size Price
    LBD0201 250g $16.46
    LBD0203 6 x 1kg $343.90
    LBD0202 1000g $62.72
    For maintenance and propagation of Escherichia coli.
    Select options
    Formula
    g/l
    Tryptone 20
    Yeast extract 15
    NaCl 20
    Agar 15
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 70 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • Nutrient Broth

    $45.56$451.84
    SKU Pack Size Price
    NBO01 500g $45.56
    NBO03 6 x 1kg $451.84
    NBO02 1000g $83.68
    Select options
    Formula
    g/l
    Peptone 5
    Beef Extract 1
    Yeast Extract 2
    NaCl 5
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 13 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • Nutrient Agar

    $49.20$501.04
    SKU Pack Size Price
    NAO01 500g $49.20
    NAO03 6 x 1kg $501.04
    NAO02 1000g $92.86
    Select options
    Formula
    g/l
    Peptone 5
    Beef Extract 1
    Yeast Extract 2
    NaCl 5
    Agar 15
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 28 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • Tryptone Broth

    $18.71$369.02
    SKU Pack Size Price
    TPB0101 250g $18.71
    TPB0103 6 x 1kg $369.02
    TPB0102 1000g $68.43
    General purpose medium for maintenance and propagation of Escherichia coli.
    Select options
    Formula
    g/l
    Tryptone 10
    NaCl 8
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 18 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • Tryptone Agar

    $24.43$484.23
    SKU Pack Size Price
    TPA0101 250g $24.43
    TPA0103 6 x 1kg $484.23
    TPA0102 1000g $89.92
    Select options
    Formula
    g/l
    Tryptone 10
    NaCl 8
    Agar 15
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 33 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • Tryptone Top Agar

    $24.43$89.92
    SKU Pack Size Price
    TPT0101 250g $24.43
    TPT0102 1000g $89.92
    Select options
    Formula
    g/l
    Tryptone 10
    NaCl 8
    Agar 7
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 25 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • Terrific Broth

    $18.71$369.89
    SKU Pack Size Price
    TRB0101 250g $18.71
    TRB0104 500g $33.78
    TRB0103 6 x 1kg $369.89
    TRB0102 1000g $68.43
    Terrific Broth is rich nutritional medium developed by Tartoff and Hobbs supporting luxurious high density growth of E.coli and a higher yield of plasmid DNA compared to LB type media. Recombinant E. coli cells have an extended growth phase in Terrific medium. Terrific medium is used with glycerol as a carbon source. Unlike glucose, glycerol is not fermented to acetic acid. Tryptone and Yeast are present in the medium in elevated concentrations and provide nitrogen, vitamins and cofactors for a luxurious growth. Potassium phosphate is present in Terrific broth buffered to balance the pH and subsequently prevent cell death due to a drop in pH. Tartoff, K. D., and C. A. Hobbs, Improved media for growing plasmids and cosmid clones, Bethesda Research Laboratories, 9, 12, (1987). Sambrook, J,., E. F. Fritsch, and T. Maniatis, 1989, Molecular cloning: a laboratory manual, 2nd edition ed., Cold Spring Harbour laboratory, Cold Spring Harbour, N.Y.
    Select options
    Formula
    g/l
    Tryptone 12
    Yeast Extract 24
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 36 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • Terrific Agar

    $24.26$444.21
    SKU Pack Size Price
    TRA0101 250g $24.26
    TRA0103 6 x 1kg $444.21
    TRA0102 1000g $82.47
    Select options
    Formula
    g/l
    Tryptone 12
    Yeast Extract 24
    Agar 15
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 51 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • SKU Pack Size Price
    TBP0102 1kg $68.43
    TBP0103 6 x 1kg $369.89
    TBP0101 250g $18.71
    Phosphate Buffered
    Select options
    Formula
    g/l
    Tryptone 12
    Yeast Extract 24
    KH2PO4 9.4
    K2HPO4 2.2
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 47.6 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • SKU Pack Size Price
    TAP0101 250g $22.52
    TAP0103 6 x 1kg $444.21
    TAP0102 1000g $82.29
    Phosphate Buffered
    Select options
    Formula
    g/l
    Tryptone 12
    Yeast Extract 24
    KH2PO4 9.4
    K2HPO4 2.2
    Agar 15
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 62.6 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • Super Broth

    $22.52$444.91
    SKU Pack Size Price
    SPB0101 250g $22.52
    SPB0103 6 x 1kg $444.91
    SPB0102 1000g $82.47
    Super broth is an extremely rich medium with highly elevated levels of Tryptone and Yeast extract. Due to the high levels of peptides, amino acids, vitamins and cofactors high yields of E. coli cells and lambda bacteriophages are obtained.
    Select options
    Formula
    g/l
    Tryptone 35
    Yeast Extract 20
    NaCl 5
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 60 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • Super Broth Agar

    $25.81$510.57
    SKU Pack Size Price
    SPA0101 250g $25.81
    SPA0103 6 x 1kg $510.57
    SPA0102 1000g $94.77
    Select options
    Formula
    g/l
    Tryptone 35
    Yeast Extract 20
    NaCl 5
    Agar 15
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 75 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • Super Broth Top Agar

    $25.81$94.59
    SKU Pack Size Price
    SPT0101 250g $25.81
    SPT0102 1000g $94.59
    Select options
    Formula
    g/l
    Tryptone 35
    Yeast Extract 20
    NaCl 5
    Agar 7
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 67 gram powdered medium in 1 litre distilled water Store dry at room temperature
    View product
  • M9 Minimal Salts Base, 5x

    $33.61$580.39
    SKU Pack Size Price
    MMS0101 250g $33.61
    MMS0103 6 x 1kg $580.39
    MMS0102 1000g $108.28
    M9 Minimal Salts Base, 5x is used in preparing M9 Minimal medium used for the cultivation and maintenance of E. coli in molecular biology. M9 is a chemical defined minimal medium supporting the growth of  �wild-type� strains of E.coli. The medium can be supplemented with specific amino acids or other required nutrients allowing for selection of specific auxotrophs. Glucose may be added as a source of carbohydrate. Nitrogen is provided by ammonium chloride final osmolarity of the medium is maintained by NaCl. Addition of magnesium and calcium increases the growth of the recombinant cells. M9 Minimal Salts Base, 5x is a 5x concentrate and has to be diluted to a 1x concentration and subsequently supplemented with an appropriate carbon source, such as glucose. Addition of required nutritionally elements may be added. Difco Manual, 11th edition, Sparks, MD, 272, 1998. Davis, L.G., M.D. Dibner and J.F. Battey, Basic methods in molecular biology, Elsevier, new York, (1986). Sambrook, J,., E. F. Fritsch, and T. Maniatis, 1989, Molecular cloning: a laboratory manual, 2nd edition ed., Cold Spring Harbour laboratory, Cold Spring Harbour, N.Y.
    Select options
    Formula
    g/l
    Na2HPO4 33.9
    KH2PO4 15
    NaCl 2.5
    NH4Cl 5
    Final pH 6.8 � 0.2 at 25°C
    Suspend 56.4 gram powdered medium in 1 litre distilled water Store dry at room temperature
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  • M17 Broth

    $143.80$785.86
    SKU Pack Size Price
    M170160 6 x 1kg $785.86
    M170110 1kg $143.80
    M17 Medium is a well buffered enriched medium for bacterial growth. The medium is optimized for isolating lactic Streptococci. Casein hydrolysate, Beef extract and Soya peptone supply carbon sources, nitrogen, vitamins and minerals essential for vigorous growth. Yeast extract supplies B-complex vitamins which stimulate bacteria growth. The medium is buffered by Disodium-β-glycerophosphate which prevents a drop in pH by the production of organic acids, such as lactic acid, during fermentation. Ascorbic acid and Magnesium sulphate are added to stimulate growth.
    Select options
    Formula
    g/l
    Pancreatic Digest of Casein 5.0
    Soy Peptone 5.0
    Beef Extract 5.0
    Yeast Extract 2.5
    Ascorbic Acid 0.5
    Magnesium Sulfate 0.25
    Disodium-�-glycerophosphate 19.0
    Suspend 36.15 grams of powdered medium in 1 litre distilled water Store dry at room temperature
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  • Blood Agar Base

    $61.85$602.56
    SKU Pack Size Price
    BAB0105 500g $61.85
    BAB0160 6 x 1kg $602.56
    BAB0110 1000g $109.15
    Select options
    Formula
    g/l
    Peptone 10
    Beef Extract 10
    NaCl 5
    Agar 12
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 37gram powdered medium in 1 litre distilled water Store dry at room temperature
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  • Malt Extract Agar

    $34.65$608.11
    SKU Pack Size Price
    MEA0102 250g $34.65
    MEA0160 6 x 1kg $608.11
    MEA0110 1000g $112.61
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    Formula
    g/l
    Malt Extract 30
    Peptone 5
    Agar 15
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 50 gram powdered medium in 1 litre distilled water Store dry at room temperature
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  • MacConkey Agar Base

    $181.91$982.33
    SKU Pack Size Price
    MAB60 6 x 1kg $982.33
    MAB10 1000g $181.91
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    Formula
    g/l
    Peptone 20
    Bile salts 1.5
    NaCl 5
    Neutral red 0.03
    Crystal violet 0.001
    Agar 13.5
    Final pH 7.0 ± 0.2 at 25°C
    Suspend 40 gram powdered medium in 1 litre distilled water Store dry at room temperature
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  • Mueller Hinton Broth

    $48.51$748.44
    SKU Pack Size Price
    MHB0100 250g $48.51
    MHB0102 6 x 1kg $748.44
    MHB0101 1000g $138.60
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    Formula
    g/l
    Casamino acids 17.5
    Peptone 2
    Soluble starch 1.5
    Soluble starch 7.0 ± 0.2 at 25°C
    Suspend 21 gram powdered medium in 1 litre distilled water Store dry at room temperature
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  • Sabouraud Agar

    $17.24$50.94
    SKU Pack Size Price
    SAB0105 500g $29.11
    SAB0110 1kg $50.94
    SAB0102 250g $17.24
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    Formula
    g/l
    Peptone 10
    Glucose 40
    Agar 20
    Final pH 7.0 ± 0.2 at 25°C Suspend 70 gram powdered medium in 1 litre distilled water Store dry at room temperature
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