Reasonability check - aminos

[Sebae]

Let’s assume I have 1 L of an amino acid product that is solely aspartic acid. If the solubility of aspartic acid in water is 4.5 g/L and my product has no insoluble bit at the bottom, is it reasonable to assume that there is only 4.5 g of aspartic acid at most in the product? How would mixing in vinegar change the solubility?

 

[Dan_P]

Let’s assume I have 1 L of an amino acid product that is solely aspartic acid. If the solubility of aspartic acid in water is 4.5 g/L and my product has no insoluble bit at the bottom, is it reasonable to assume that there is only 4.5 g of aspartic acid at most in the product? How would mixing in vinegar change the solubility?

The solubility of an amino acid depends on pH, being least soluble at its isoelectric point. Adding vinegar could increase its solubility.

 

[Sebae]

The solubility of an amino acid depends on pH, being least soluble at its isoelectric point. Adding vinegar could increase its solubility.

So if the isoelectric point of aspartic acid is 3, I would imagine vinegar would decrease solubility as it would drop the pH whereas a more basic solution would increase the solubility?

 

[Dan_P]

So if the isoelectric point of aspartic acid is 3, I would imagine vinegar would decrease solubility as it would drop the pH whereas a more basic solution would increase the solubility?

Yes, that is correct.