insulin concentration for tissue culturecalculation problems
Posted 03 September 2012 - 06:26 PM
Can someone help me understand the mneaning of the units? How do I know the concentration required based on 0.1units/ml?
I bought 100 mg insulin (powder form) and it has a formula weight of 5733.5
Posted 03 September 2012 - 07:47 PM
It seems like most suppliers that I just looked up (with good ol' google) provide their insulin powders at 27 units per mg.
Most list USP per mg and apparently a USP is essentially equal to an IU.
Posted 05 September 2012 - 12:38 AM
The bottle insulin contains 100mg of powder
If the insluin formula weight is 5733.49
What conc of stock do I make and then to what conc do I dilute it to give me 0.1Unit/ml for 50ml culture medium
Posted 05 September 2012 - 01:06 AM
I think you might be confusing yourself and over thinking this?
There are 25.2 units/mg. And you have 100mg. So you have 2520 units in total.
You want 0.1 units/ml final concentration.
I would probably make a 100x stock, so you need 10units/ml
So how many ml do you dissolve your 100mg in to get 10units/ml?
2520 units/ 10 units = 252
So dissolve the entire 100mg into 252ml for your 100x stock
*disclaimer: I am TERRIBLE at calculations, maths etc etc and often (always) have someone check my calcs before proceeding, so hopefully someone will be on me in a flash if I'm wrong here!