Team:Bielefeld-Germany/Protocols/Immobilization

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(Difference between revisions)
(Britton-Robinson-buffer)
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== Britton-Robinson-buffer ==
== Britton-Robinson-buffer ==
-
0.1 M acetic acid
+
*0.1 M acetic acid
-
 
+
*0.1 M boric acid
-
0.1 M boric acid
+
*0.1 M phosphoric acid
-
 
+
-
0.1 M phosphoric acid
+
adjusted to the desired pH by addition of 1 N sodium hydroxide
adjusted to the desired pH by addition of 1 N sodium hydroxide

Revision as of 19:52, 15 September 2012


Immobilization

Laccase was immobilized on the CPC-silica beads 0,12g of beads were immersed in 1ml 2.5% glutaraldehyde and put under light vacuum for 2 hours in order to degas the beads and allow as much bead surface area as possible to be coated with aldehyde groups.

The beads were washed (2 times with 1ml) with Britton-Robinson-buffer (pH 5) and then immersed in a stock laccase solution (i.e., 1 mg of laccase in 1mL of buffer prepared the same day) for at least 36 hours at 4°C. After washing the beads with buffer again (2 times with 1 mL), the beads were rinsed with 1 mL 0.5M sodium chloride in order to prevent sorption of the enzyme onto the beads, since only the measurement of reactions catalyzed by covalently bonded enzyme was desired. The beads were again washed with buffer and then immersed in 1 mL of 2.5mg/mL glycine for at least 18 hours at 4°C. They were than washed, first with buffer, then 0.5 M sodium chloride then buffer, and finally stored in buffer at 4° C until use. All reagents used in the immobilization process were made in Britton-Robinson-buffer.


Britton-Robinson-buffer

  • 0.1 M acetic acid
  • 0.1 M boric acid
  • 0.1 M phosphoric acid

adjusted to the desired pH by addition of 1 N sodium hydroxide


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