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mahroo1356

Member Since 10 Sep 2012
Offline Last Active Apr 28 2013 11:17 PM
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Topics I've Started

Enzyme assay

02 January 2013 - 07:56 AM

Hi and happy new year,

I am going to prepare pyruvte kinase enzyme for section of assay process of starch synthase enzymic activity .
Pyruvate kinase enzyme is as a crystalline suspension in 3.2 M ammonium sulfate, pH 6.0.  (5000 unit ).
for each assay 1.2 unit of this enzyme must be used. I know how calculate the amount of µL that is need for each assey and i know how prepare the work stock, but i don't know how can i prepare an solution of purchased enzyme as purified stock. I want to know the preperation method of purified stock of enzyme that is as a crystalline suspension. (form of purchased enzyme is crystalline particles). Prompet reply will be really appreciated.

Preparation of phosphate potassium buffer

10 September 2012 - 09:56 AM

I want to prepare phosphate potassium buffer 0.1 M (pH=7.4) , consist of 0.5 mM EDTA. Supposed daily consumption is 80mL.
I have 1M K2HPO4 stock, 1M KH2PO4 and 0.5M EDTA stock. My questions are:
  • Could i be able to prepare 200mL of above mentioned buffer and use for one week via following method?

0.2mL EDTA 0.5 M + 16mL K2HPO4 1M + 4mL KH2PO4 1M


then dilute to 200mL (with adjusted pH).



    2. The prepared buffer should be stored in refrigerator?


Your prompt response will be really appreciated!

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