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L7533

Sigma-Aldrich

LB Broth with agar (Lennox)

EZMix powder microbial growth medium

Synonym(s):

LB broth

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About This Item

UNSPSC Code:
41106200
NACRES:
NA.85

grade

for molecular biology

Quality Level

200

sterility

non-sterile

form

powder

composition

Agar, 15 g/L
NaCl, 5 g/L
Tryptone, 10 g/L
Yeast Extract, 5 g/L

technique(s)

microbiological culture: suitable

application(s)

agriculture
food and beverages
microbiology

storage temp.

room temp

suitability

nonselective for Escherichia coli
nonselective for coliforms

Related Categories

General description

Lennox LB is a highly-referenced microbial growth medium used for the cultivation of E. coli. This nutrient-rich microbial broth contains peptides, amino acids, water-soluble vitamins, and carbohydrates in a low-salt formulation. The addition of agar provides a solid medium for microbial growth.

Application

Suitable for non-selective cultivation of E. coli strains for cloning, DNA plasmid production and production of recombinant proteins. Also suitable for selective cultivation when appropriate antibiotics are added, including those that require low-salt conditions, such as Zeocin®.

Features and Benefits

Lennox EZMix powder with agar provides:
  • A budget-friendly alternative to pre-poured plates
  • Granulated, dust-free format for safer handling and faster mixing
  • Convenient small package to eliminate weighing
  • Easy scale-up using larger package sizes
  • Standard formulation

Preparation Note

1. Suspend 35.6 g in 1 L of distilled water.
2. Heat to boiling while stirring to dissolve all ingredients completely.
3. Autoclave for 15 minutes at 121°C.
To prepare Lennox L Agar: Add 1 g glucose and proceed with preparation instructions as above.
To prepare the medium of Enquist and Sternberg: Aseptically add 10 ml of sterile 1 M magnesium sulfate after autoclaving.

Reconstitution

Add 35.6g powder in 1L water. Heat to boiling while stirring to dissolve powder. Autoclave for 15 minutes at 121C to sterilize. Allow to cool slightly before making additions, such as antibiotics (if desired). Pour into petri dishes and allow to solidify.

Legal Information

Zeocin is a registered trademark of Cayla Sarl

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Storage Class Code

11 - Combustible Solids

WGK

WGK 2

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificates of Analysis (COA)

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Sambrook, J., et al
Molecular Cloning: A Laboratory Manual, 2, 1-1 (1989)
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Current Protocols in Molecular Biology, 1, 3-3 (1994)
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