Abstract
Differential scanning calorimetry (DSC) was used as a screening technique to study the interaction between lipoic acid and amino acids. The samples containing lipoic acid and amino acids were prepared by two different methods (milling method and cooling crystallization method). Firstly, cooling method was used to prepare the sample with amino acids as additives. DSC results indicated that only phenylalanine has some interaction with lipoic acid. Further, in order to study the interaction between lipoic acid and phenylalanine, another method (milling method) was used to prepare the sample containing phenylalanine, and the effect of sample preparation methods was studied through IR analysis and the X-ray powder diffraction. On the basis of above researches, the possible interaction mechanisms between lipoic acid and phenylalanine were proposed.
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