(r43) ProtocolsAntibioticStockSolutions < Lab

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---+ 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&nbsp;mg/mL | 100&nbsp;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&prime;-Azido-2&prime;,3&prime;-dideoxythymidine | AZT | 10&nbsp;mg/mL | 200&nbsp;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&nbsp;mg/mL | 80&nbsp;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 &beta;-galactosidase, which cleaves X-Gal to yield an insoluble blue precipitate. |
| Carbenicillin | Crb | 100&nbsp;mg/mL | 100&nbsp;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&nbsp;mg/mL | 20&nbsp;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&nbsp;mg/mL | 100&nbsp;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&nbsp;mg/mL | 4&nbsp;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&nbsp;mM | 0.3&nbsp;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&nbsp;mg/mL | 250&nbsp;µg/mL&nbsp;<i>E.&nbsp;coli</i><br>10&nbsp;µg/mL&nbsp;<i>Lactobaccillus</i>&nbsp;sp. | 1,000x | EtOH | [[http://www.sigmaaldrich.com/catalog/product/sigma/e5389?lang=en&region=US][link]] |May crystallize when added to liquid culture.  Still works.  Selection strength may vary in non-model bacteria |
| Gentamicin | Gen | 5&nbsp;mg/mL | 5&nbsp;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 &beta;-D-1-thiogalactopyranoside  | IPTG | 0.1&nbsp;M | 0.1&nbsp;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&nbsp;mg/mL | 50&nbsp;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&nbsp;mg/mL | 30&nbsp;µg/mL | 1,000× |  1M NaOH | [[http://www.sciencelab.com/msds.php?msdsId=9926169][link]] | |
| Novobiocin | Nov | 200&nbsp;mg/mL | 200&nbsp;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&nbsp;mg/mL | 100&nbsp;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&nbsp;mg/mL | 60&nbsp;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&nbsp;mg/mL | 100&nbsp;µg/mL | 1,000× | ddH<sub>2</sub>O | [[http://www.sciencelab.com/msds.php?msdsId=9927414][link]] | |
| Tetracycline | Tet | 10&nbsp;mg/mL | 10&nbsp;µg/mL | 1,000× |  70% EtOH | [[http://www.sciencelab.com/msds.php?msdsId=9925200][link]] | Light sensitive, stability &lt; 2 weeks |
| Zeocin | Zeo | 10&nbsp;mg/mL | 10&nbsp;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 |
 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.
Barrick Lab > ProtocolList > ProtocolsGeneGorgingMarker > ProtocolsAntibioticStockSolutions
Topic revision: r43 - 2017-12-15 - 03:27:25 - Main.JeffreyBarrick