RE: [ccp4bb]: Seleno Methionine

[<gbirrane@caregroup.harvard.edu>]

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> This is a basic question not directly related to CCP4.
> We want to buy so commercially available SelenoMethionine and we mainly
> found 2 providers : Sigma and Acros.
> 
> The thing that stiked us is the price difference between these providers
> :
>
> Acros : L Selenomethionine 99+%
> R/23/25 33; S 20/21 28A 45 UN 3283 DOT 6.1(55C)
>
> Price  250 mg  : 412 Francs
>         1  g  : 555 Francs
>        2.5 g  : 717 Francs
>
>
> Sigma : Seleno-L-Methionine
> R:62-36/37/38  S:26-36
>
> Price   25 mg  : 232 Francs
>       100 mg  : 726 Francs
> 
> Does anybody know why there is such a price difference? Any experience
> with any of these products and which one to choose?
> 


The price depends on the quantity you buy.
If you buy 1gm from SIGMA (you do not give to price)
it works out to be cheaper per prep then buying
100mg or 250mg amounts each time.

We buy from Fisher Scientific (stocking Acros
products) just because they don't charge us for
delivery. ACROS selenomethionine works very well
for me. I have used SIGMA selenomethionine in the 
past and I don't see any difference.

If you need to buy bucketloads of the stuff, I think
CALBIOCHEM will give you an even better price if you
call them up.

All the best,
Gabriel Birrane