Glycerol Stocks

From 2010.igem.org

(Difference between revisions)

Latest revision as of 16:44, 2 July 2010

Materials

Reagents

   -Bacterial culture growing in appropriate liquid medium
   -Glycerol, 60%, sterile (see Step 1)
   -nutrient (LB, TSB, etc.) agar plate containing the appropriate antibiotic

Equipment

   -Incubator, preset to correct temperature for growth
   -Inoculating loop, sterile/sterile toothpicks/sterile glass capillary tube
   -Tube, storage, with screw cap and air-tight gasket

Method

Sterilize glycerol by autoclaving for 20 minutes at 15 pounds per square inch (psi) (1.05 kg/cm2) on liquid cycle
To 1.5 ml of bacterial culture, add 0.5 ml of the sterile glycerol in a labeled storage tube (final glycerol concentration of 15%). Label the top with a strain ID and the side with more detail (strain, date, initials).
Vortex the culture to ensure that the glycerol is evenly dispersed.
Optional: Freeze the culture in ethanol-dry ice or in liquid nitrogen.
Transfer the tube to the -80°C freezer, and record its location and contents in your notebook.
To recover the bacteria, scrape the frozen surface of the culture with a sterile inoculating loop, and then immediately streak the bacteria that adhere to the needle onto the surface of an LB agar plate containing the appropriate antibiotic. Return the frozen culture to storage at -80°C. Incubate the plate overnight to get individual colonies.

Notes

This protocol describes a method for storing bacterial cultures containing glycerol which are growing in liquid media.
Based on CSH Protocols; 2006; doi:10.1101/pdb.prot445
Best results are probably had from liquid cultures that are in late exponential growth, but stationary phase overnight cultures are usually also fine.
Some antibiotics can cause problems in long-term storage. Spin down the culture and resuspend in plain medium if you are concerned about this.
Some people use higher glycerol concentrations (25%,50%) for their stocks. Higher percentages may be good for longer-term storage, but this is speculation. Sean 15:57, 20 September 2007 (EDT)
You can also aliquot glycerol into screw-cap tubes and autoclave for 15 minutes.

Adapted from the openwetware wiki

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@@ Line 1: / Line 1: @@
-==MATERIALS==
+==Materials==
 Reagents
@@ Line 13: / Line 13: @@
      -Tube, storage, with screw cap and air-tight gasket
-==METHOD==
+==Method==
-   #Sterilize glycerol by autoclaving for 20 minutes at 15 pounds per square inch (psi) (1.05 kg/cm2) on liquid cycle.
+#Sterilize glycerol by autoclaving for 20 minutes at 15 pounds per square inch (psi) (1.05 kg/cm2) on liquid cycle
-   #To 1.5 ml of bacterial culture, add 0.5 ml of the sterile glycerol in a labeled storage tube (final glycerol concentration of 15%). Label the top with a strain ID and the side with more detail (strain, date, initials).
+#To 1.5 ml of bacterial culture, add 0.5 ml of the sterile glycerol in a labeled storage tube (final glycerol concentration of 15%). Label the top with a strain ID and the side with more detail (strain, date, initials).
-   #Vortex the culture to ensure that the glycerol is evenly dispersed.
+#Vortex the culture to ensure that the glycerol is evenly dispersed.
-   #Optional: Freeze the culture in ethanol-dry ice or in liquid nitrogen.
+#Optional: Freeze the culture in ethanol-dry ice or in liquid nitrogen.
-   #Transfer the tube to the -80°C freezer, and record its location and contents in your notebook.
+#Transfer the tube to the -80°C freezer, and record its location and contents in your notebook.
-   #To recover the bacteria, scrape the frozen surface of the culture with a sterile inoculating loop, and then immediately streak the bacteria that adhere to the needle onto the surface of an LB agar plate containing the appropriate antibiotic. Return the frozen culture to storage at -80°C. Incubate the plate overnight to get individual colonies.
+#To recover the bacteria, scrape the frozen surface of the culture with a sterile inoculating loop, and then immediately streak the bacteria that adhere to the needle onto the surface of an LB agar plate containing the appropriate antibiotic. Return the frozen culture to storage at -80°C. Incubate the plate overnight to get individual colonies.
 ==Notes==
-    *This protocol describes a method for storing bacterial cultures containing glycerol which are growing in liquid media.
+*This protocol describes a method for storing bacterial cultures containing glycerol which are growing in liquid media.
-    *Based on CSH Protocols; 2006; doi:10.1101/pdb.prot445
+*Based on CSH Protocols; 2006; doi:10.1101/pdb.prot445
-    * Best results are probably had from liquid cultures that are in late exponential growth, but stationary phase overnight cultures are usually also fine.
+*Best results are probably had from liquid cultures that are in late exponential growth, but stationary phase overnight cultures are usually also fine.
-    * Some antibiotics can cause problems in long-term storage. Spin down the culture and resuspend in plain medium if you are concerned about this.
+*Some antibiotics can cause problems in long-term storage. Spin down the culture and resuspend in plain medium if you are concerned about this.
-    * Some people use higher glycerol concentrations (25%,50%) for their stocks. Higher percentages may be good for longer-term storage, but this is speculation. Sean 15:57, 20 September 2007 (EDT)
+*Some people use higher glycerol concentrations (25%,50%) for their stocks. Higher percentages may be good for longer-term storage, but this is speculation. Sean 15:57, 20 September 2007 (EDT)
-    * You can also aliquot glycerol into screw-cap tubes and autoclave for 15 minutes.
+*You can also aliquot glycerol into screw-cap tubes and autoclave for 15 minutes.
 Adapted from the openwetware wiki
 Back to [[Team:Northwestern/Protocol|<span style="color:#4B088A;">Protocol</span>]]
 [[Category:Protocol]]