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#1
03-28-2009, 11:51 AM
 Unregistered Guest Posts: n/a
picomoles to nanograms

Hi - this is a silly question but I rarely do these convertions. Trying to convert 44 pmol/L of estradiol is in ng/L. The molarity of estradiol is 1pg/mL = 3.671/L
#2
03-28-2009, 01:01 PM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,442 Rep Power: 19
Re: picomoles to nanograms

Quote:
 Originally Posted by Unregistered Hi - this is a silly question but I rarely do these convertions. Trying to convert 44 pmol/L of estradiol is in ng/L. The molarity of estradiol is 1pg/mL = 3.671/L
Per Wikipedia, the molar mass of estradiol is 272.38 g/mol
So 44 pmol/L x 272.38 g/mol = 11985 pg/L = 11.985 ng/L
(it should probably round to 12 ng/L).
#3
03-28-2009, 03:05 PM
 Unregistered Guest Posts: n/a
Re: picomoles to nanograms

Thanks! - so you don't have to convert the molarity to picomoles? you can just use g/mol?
#4
03-28-2009, 03:12 PM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,442 Rep Power: 19
Re: picomoles to nanograms

Quote:
 Originally Posted by Unregistered Thanks! - so you don't have to convert the molarity to picomoles? you can just use g/mol?
Molarity is just a shorthand for moles per liter, which is what you started with. The 44 pmol/L could also be expressed as 44 picomolar.

Conversion between grams and moles ALWAYS involves the molar mass. You may also have some prefixes to resolve. The 3.671 figure you mentioned is actually 1000 (from a prefix change) divided by 272.38.
#5
03-28-2009, 03:28 PM
 Unregistered Guest Posts: n/a
Re: picomoles to nanograms

thanks for the lesson. much appreciated.

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