# Converting micrograms to moles for IgG

Francis Durst francis.durst at bota-ulpnospam.u-strasbg.fr
Tue Nov 14 13:01:00 EST 2000

The dalton is a mass unit : your IgG will be 150 kDA on earth and on the
moon, whilst it will weight much less than 150 kg on the moon
Francis

In article
<8ur6ug\$4nb\$1 at oyez.ccc.nottingham.ac.uk> "Student" <mucineer at iname.com>
writes:>From: "Student" <mucineer at iname.com>>Subject: Re: Converting
micrograms to moles for IgG>Date: Tue, 14 Nov 2000 11:16:41 -0000

>I thought 150kDa means approximately 150,000grams?

>I am confused. So can someone confirm this is right:

>1 mole of a protein means there is 6.02x10E23 molecules of that protein. and
>for an IgG, 150,000grams of the antibody will contain 6.02E23 IgG molecule
>which is 1 mole of IgG?

>> No, 1 mole is about 150,000 grams.
>>
>> Rich Miller
>>
>> clarosa wrote:
>>
>> > yes 1 mole is about 150 kDA..given that the size is an estimate.
>> >
>> > Student wrote:
>> >
>> > > This may sound a very silly question to many of you. Whilst I know how
>to
>> > > convert mass to moles for small molecules, I have never done it for
>large
>> > > proteins. For an IgG1 molecule, I know the size is approximately
>150kDa.
>> > > Does this mean that 1 mole = 150,000grams? (It would be rather tedious
>to
>> > > add up all the molecular weights of the amino acids to get the molar
>mass!)
>> > >
>> > > Thanks, and excuse my ignorance!
>>