reconstituting protein

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biology_06er
Coral
Posts: 260
Joined: Tue Mar 21, 2006 9:33 am

reconstituting protein

Hi there,

I was sent a protein (100ug) and the data sheet tells me to reconstitute at 100ug/mL in PBS..does this mean I just add 1mL of PBS to the powder form I have hence I'll have a final conc of 100ug/mL...

what if I had a powder form of 50ug (as you can get this conc as well sent and the data sheet also says to reconstitute it at 100ug/mL..is this even possible..if i used the formula )
c1*v1=c2*v2
50*v1=100*1mL
v1=100/50
v1=2

doesn't make sence to me..to add "2" mL/s

anyone help with both questions above..i think i have the first one correct

Cheers,
b_06er

JackBean
Inland Taipan
Posts: 5694
Joined: Mon Sep 14, 2009 7:12 pm
yes, no

you cannot use c1V1 = c2V2, since you're not diluting a solution but solubilizing a solid phase. Thus, you're missing V1. What you want is m = c.V (in your case is concentration in g/l, not mol/l), thus you have
50 ug = 100 ug/ml . V1 -> V1 = ?
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

biology_06er
Coral
Posts: 260
Joined: Tue Mar 21, 2006 9:33 am

Re: reconstituting protein

Hi, thanks for that...so another question following on from it..if I have 100ug/mL of protein and I plan to run an ELISA using it..and to each well I need (1.5 ug/mL with 100 uL/well)

So for example, if I wanted to use 50 wells with 100uL in each well and 1.5ug/mL in each well would I use the formula

C1*V1=C2*V2
100ug/mL*V1=1.5ug/mL*(50*100uL=5000uL)

V1=75uL

So I would add 75uL of my 100ug/mL stock to 4925uL of PBS to make 1.5ug/mL...and if I took 100uL of this and added to each well would I be correct?

Thanks,
b__06er

JackBean
Inland Taipan
Posts: 5694
Joined: Mon Sep 14, 2009 7:12 pm
yes, but are you sure, it's supposed to be 100 ul of only your protein?

(BTW it's always better to make little bit more of your mix, because you may lack some due to the pipetting error)
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

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