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6

According to the sigma document you referenced (emphasis added by me): "The free acid is soluble at 0.24 g/L in water at 15ºC, while the sodium salt is soluble at >333 g/L in water at 15ºC. Therefore, pH control is very important to the use of this product. Aqueous solutions precipitate as the pH is lowered to 5." According to the FDA document ...


2

Good question, this regards rotamers! Basically, the side chain of amino acids can rotate as shown in the figure below for glutamate (Glu; E). The various option for side-chain rotation is called rotamers! Some amino-acids side chains have the potential of many rotamers (such as glutamate) while some can only adopt a few (such as tryptophan) due to steric ...


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