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The sample background fluorescence was lower for the samples passed through the SPE columns (Fig

Research interest in the arginine salt variant has grown because of its potentially improved water solubility and shelf stability compared to the standard form, though both variants appear in the preclinical literature and researchers continue to examine how these formulation differences may affect biological activity

It supports nerve regeneration and may significantly reduce symptoms in conditions such as diabetic neuropathy or peripheral nerve disorders

2 Materials and methods 2.1 Chemicals and reagents Protease and phosphatase inhibitors and Bradford Protein Assay Kit were purchased from Beyotime (Haimen, China)