<noautolink> ---+ Media Amendment Stock Solutions %TABLE{headeralign="left,center,center,center,center,left" dataalign="left,center,center,center,center,left,center,left"}% | *Reagent* | *Abb* | *Stock Conc.* | *Working Conc.* | *Dilution* | *Solvent* | *MSDS* | *Notes* | | Ampicillin | Amp | 100 mg/mL | 100 µg/mL | 1,000× | ddH<sub>2</sub>O | [[http://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?country=US&language=en&productNumber=A9518&brand=SIAL&PageToGoToURL=http%3A%2F%2Fwww.sigmaaldrich.com%2Fcatalog%2Fproduct%2Fsial%2Fa9518%3Flang%3Den][ link]] | | | 3′-Azido-2′,3′-dideoxythymidine | AZT | 10 mg/mL | 200 µg/mL | 50× | ddH<sub>2</sub>O | [[http://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?country=US&language=en&productNumber=11546&brand=FLUKA&PageToGoToURL=http%3A%2F%2Fwww.sigmaaldrich.com%2Fcatalog%2Fproduct%2Ffluka%2F11546%3Flang%3Den][link]] | Can substitute pharma grade Zidovudine. Soluble up to 20 mg/mL in ddH<sub>2</sub>O | | Bromo-chloro-indolyl-galactopyranoside | X-gal | 40 mg/mL | 80 µg/mL | 500× | Dimethylformamide (DMF) | [[http://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?country=US&language=en&productNumber=B4252&brand=SIAL&PageToGoToURL=http%3A%2F%2Fwww.sigmaaldrich.com%2Fcatalog%2Fproduct%2Fsial%2Fb4252%3Flang%3Den][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 | [[http://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?country=US&language=en&productNumber=C1389&brand=SIAL&PageToGoToURL=http%3A%2F%2Fwww.sigmaaldrich.com%2Fcatalog%2Fproduct%2Fsial%2Fc1389%3Flang%3Den][link]] | | | Chloramphenicol | Cam | 20 mg/mL | 20 µg/mL | 1,000× | EtOH | [[http://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?country=US&language=en&productNumber=C0378&brand=SIGMA&PageToGoToURL=http%3A%2F%2Fwww.sigmaaldrich.com%2Fcatalog%2Fproduct%2Fsigma%2Fc0378%3Flang%3Den][link]] | | | Cycloheximide | Chx | 100 mg/mL | 100 µg/mL | 1,000× | 100% DMSO | [[http://www.sciencelab.com/msds.php?msdsId=9923627][link]] | Anti-fungal, toxic to humans, use PPE! | | D-Cycloserine | Dcs | 4 mg/mL | 4 µg/mL | 1,000× | ddH<sub>2</sub>O | [[http://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?country=US&language=en&productNumber=30020&brand=SIGMA&PageToGoToURL=http%3A%2F%2Fwww.sigmaaldrich.com%2Fcatalog%2Fproduct%2Fsigma%2F30020%3Flang%3Den][link]] | Degrades noticeably over the course of 1 week at 4°C | | Diaminopimelic acid | DAP | 100 mM | 0.3 mM | 333× | ddH<sub>2</sub>O | [[http://www.sciencelab.com/msds.php?msdsId=9927175][link]] | Use 3 µl stock per 1 ml of media. Dissolve with overnight shaking. | | Erythromycin | Ery | 250 mg/mL | 250 µg/mL <em>E. coli</em><br />10 µg/mL _Lactobaccillus_ sp. | 1,000x | EtOH | [[http://www.sigmaaldrich.com/catalog/product/sigma/e5389?lang=en®ion=US][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× | ddH<sub>2</sub>O | [[http://www.sciencelab.com/msds.php?msdsId=9927175][link]] | For non-canonical experiments: <br />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× | ddH<sub>2</sub>O | [[http://www.sciencelab.com/msds.php?msdsId=9924418][link]] | Light sensitive, MW: 238.31 g/mol | | Kanamycin | Kan | 50 mg/mL | 50 µg/mL | 1,000× | ddH<sub>2</sub>O | [[http://www.sciencelab.com/msds.php?msdsId=9927199][link]] | Plates lose sensitivity after 2 weeks | | Nalidixic Acid | Nal | 30 mg/mL | 30 µg/mL | 1,000× | 1M NaOH | [[http://www.sciencelab.com/msds.php?msdsId=9926169][link]] | | | Novobiocin | Nov | 200 mg/mL | 200 µg/mL | 1,000× | ddH<sub>2</sub>O | [[http://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?country=US&language=en&productNumber=N1628&brand=SIGMA&PageToGoToURL=http%3A%2F%2Fwww.sigmaaldrich.com%2Fcatalog%2Fproduct%2Fsigma%2Fn1628%3Flang%3Den][link]] | | | Rifampicin | Rif | 50 mg/mL | 100 µg/mL | 500× | MeOH + drops of 10M NaOH | [[http://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?country=US&language=en&productNumber=R3501&brand=SIGMA&PageToGoToURL=http%3A%2F%2Fwww.sigmaaldrich.com%2Fcatalog%2Fproduct%2Fsigma%2Fr3501%3Flang%3Den][link]] | Toxic to humans, use PPE! | | Spectinomycin | Spec | 60 mg/mL | 60 µg/mL | 1,000× | ddH<sub>2</sub>O | [[http://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?country=US&language=en&productNumber=S4014&brand=SIGMA&PageToGoToURL=http%3A%2F%2Fwww.sigmaaldrich.com%2Fcatalog%2Fproduct%2Fsigma%2Fs4014%3Flang%3Den][link]] | | | Streptomycin | Str | 100 mg/mL | 100 µg/mL | 1,000× | ddH<sub>2</sub>O | [[http://www.sciencelab.com/msds.php?msdsId=9927414][link]] | | | Tetracycline | Tet | 10 mg/mL | 10 µg/mL | 1,000× | 70% EtOH | [[http://www.sciencelab.com/msds.php?msdsId=9925200][link]] | Light sensitive, stability < 2 weeks | | Zeocin | Zeo | 10 mg/mL | 10 µg/mL | 1,000× | ddH<sub>2</sub>O | [[http://www.invivogen.com/MSDS/Zeocin_solution_SDS.pdf][link]] | Some labs report using a higher concentration for selection. <br />10 µg/mL is specifically used for growth of amberless strain A37 | | Anhydrotetracycline | ATC | 0.1 mg/mL | 100 ng/mL | 1,000× | DMSO | [[https://www.caymanchem.com/pdfs/10009542.pdf][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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Topic revision: r44 - 2018-04-05 - DaciaLeon