LB Agar Plates with Antibiotic · Benchling LB Agar Plates with Antibiotic

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10/7/2018 LB Agar Plates with Antibiotic · Benchling LB Agar Plates with Antibiotic Introduction In order to conduct transformation experiements, you need to create agar plates that have antibiotics to select the bacteria which successfully take up your plasmid. This protocol explains how to create said agar plates containing chloroamphenicol. Materials › Tryptone › Yeast Extract › Sodium Chloride › Agar › Don't mix this up with agarose › dH2O › 1 Liter Glass Bottle › Autoclave › Stock solution antibiotic (25 mg/ml) › Stirring plate and magnetic stirrer › 24 Petri Plates (90 mm) Procedure Creating the Agar Solution 1. In a large bottle (at least 1 L), add the following: Table1 A B 1 Amount Component 2 5 grams Tryptone 3 2.5 grams Yeast Extract 4 7.5 grams Agar 5 5 grams NaCl 6 Q/S to 500 mL dH2O 2. Shake until solutes completely dissolve ﬁle:///tmp/tmpRXrOGL.html 1/2 10/7/2018 LB Agar Plates with Antibiotic · Benchling 3. Place magnetic stirring bar inside the bottle 4. Stir (7/10) with heat (about 4/10) and wait about 15-20 minutes for the salt to dissolve. When the bottle is tilted, salt should not collect at the bottom. Sterilizing the Agar 5. Pour water into a beige plastic bucket to about 1 inch deep 6. Place bottle in bucket 7. Place bucket containing bottle into autoclave and run at 121°C and 20 PSI for a total of 35 minutes (20 minutes sterilize, 15 minutes exhaust) 8. Once done, use hot hands to take bottle out of autoclave (be very careful) and place on a stirring plate 9. Place a sterile thermometer in the bottle and turn on the stirrer 10. Once the temperature in the bottle reaches 55°C, add liquid antibiotic to the bottle for a final concentration of 35 ug/mL Creating the Plates 11. Take the bottle off of the plate and remove magnetic stirring bar 12. Line up approximately 24 empty plates and remove their covers 13. OPTIONAL: Light a flame to sterilize the working area 14. Pour the liquid agar into the plates one at a time, for a depth of about 1/4 inch. About 12-16 mL ﬁle:///tmp/tmpRXrOGL.html 2/2.

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