Media Amendment Stock Solutions

Reagent Abb Stock Conc. Working Conc. Dilution Solvent MSDS Notes
Ampicillin Amp 100 mg/mL 100 µg/mL 1,000× ddH2O link  
3′-Azido-2′,3′-dideoxythymidine AZT 10 mg/mL 200 µg/mL 50× ddH2O link Can substitute pharma grade Zidovudine. Soluble up to 20 mg/mL in ddH2O
Bromo-chloro-indolyl-galactopyranoside X-gal 40 mg/mL 80 µg/mL 500× Dimethylformamide (DMF) link X-gal is a histochemical substrate for β-galactosidase, which cleaves X-Gal to yield an insoluble blue precipitate.
Carbenicillin Crb 100 mg/mL 100 µg/mL 1,000× 50% EtOH link  
Chloramphenicol Cam 20 mg/mL 20 µg/mL 1,000× EtOH link  
Cycloheximide Chx 100 mg/mL 100 µg/mL 1,000× 100% DMSO link Anti-fungal, toxic to humans, use PPE!
D-Cycloserine Dcs 4 mg/mL 4 µg/mL 1,000× ddH2O link Degrades noticeably over the course of 1 week at 4°C
Diaminopimelic acid DAP 100 mM 0.3 mM 333× ddH2O link Use 3 µl stock per 1 ml of media. Dissolve with overnight shaking.
Erythromycin Ery 250 mg/mL 250 µg/mL E. coli
10 µg/mL Lactobaccillus sp.
1,000x EtOH link May crystallize when added to liquid culture. Still works. Selection strength may vary in non-model bacteria
Gentamicin Gen 5 mg/mL 5 µg/mL 1,000× ddH2O link For non-canonical experiments:
Use 20 µg/mL in culture from 20mg/mL 1000× stock
Isopropyl β-D-1-thiogalactopyranoside IPTG 0.1 M 0.1 mM 1,000× ddH2O link Light sensitive, MW: 238.31 g/mol
Kanamycin Kan 50 mg/mL 50 µg/mL 1,000× ddH2O link Plates lose sensitivity after 2 weeks
Nalidixic Acid Nal 30 mg/mL 30 µg/mL 1,000× 1M NaOH link  
Novobiocin Nov 200 mg/mL 200 µg/mL 1,000× ddH2O link  
Rifampicin Rif 50 mg/mL 100 µg/mL 500× MeOH + drops of 10M NaOH link Toxic to humans, use PPE!
Spectinomycin Spec 60 mg/mL 60 µg/mL 1,000× ddH2O link  
Streptomycin Str 100 mg/mL 100 µg/mL 1,000× ddH2O link  
Tetracycline Tet 10 mg/mL 10 µg/mL 1,000× 70% EtOH link Light sensitive, stability < 2 weeks
Zeocin Zeo 10 mg/mL 10 µg/mL 1,000× ddH2O link Some labs report using a higher concentration for selection.
10 µg/mL is specifically used for growth of amberless strain A37
Anhydrotetracycline ATC 0.1 mg/mL 100 ng/mL 1,000× DMSO link Can also make a 1mg/mL stock and dilute 1:10 for a final concentration of 0.1mg/mL
Working concentrations are for liquid or solid media.

Preparation

Generally, prepare 30-50 mL of solution in a 50 mL conical tube. Then, filter sterilize solutions by pushing them through a 50 mL syringe fitted with a 0.22 µm filter made of a material appropriate for the solvent. Aliquot into 1.5 mL portions in 1.7 mL tubes using the repeat pipettor. Label with a permanent marker (one that won't wash off with ethanol). Store at -20°C in the dark.

Other considerations

  • Rifampicin is TOXIC to humans, light-sensitive, and degrades in solution rather quickly. It needs to be stored wrapped in foil and replaced every 2 months.
  • Ampicillin degrades quickly in both plates and stock solutions. Culture plates with Amp can be stored at 4°C for about 2 weeks. Stock solutions can be stored at 4°C for 2 weeks but can last as long as 4-6 months when stored at -20°C. In general, use carbenicillin for ampicillin selection, because it is more chemically stable.
  • D-cycloserine is best used within two days of pouring. A single small-scale experiment found 6-10x as many E. coli colonies on 8-day old MG-Dcs plates that had spent 3 of those days at -20°C and 5 at 4°C, compared to what was found on 1 day old MG-Dcs.
  • Kanamycin plates only last a few weeks at 4°C; best to make fresh Kan plates every 2 weeks.
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Contributors to this topic Edit topic JeffreyBarrick, CraigBarnhart, AurkoDasgupta, SeanLeonard, DanielDeatherage, GabrielSuarez, AlvaroRodriguez, JordanMonk, ZuberiAshraf, KateElston, DaciaLeon, SimonDAlton, ElizabethRobinson, BrianRenda, IsaacGifford, DennisMishler
Topic revision: r44 - 2018-04-05 - 18:47:15 - Main.DaciaLeon
 
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