Alpha Lipoic Acid Impurity E, also listed as Thioctic Acid Impurity 10, is a sulfur-containing process- or degradation-related impurity associated with the lipophilic dithiolane chemistry of alpha lipoic acid. The compound, CAS 2114407-82-6, has molecular formula C8H14O3S2 and molecular weight 222.3 g/mol. Its structure is consistent with an oxidized or rearranged thioctic acid derivative rather than a classical genotoxic motif. Trace-level measurement typically requires LC-MS/MS or high-resolution LC-MS, with complementary HPLC-UV or GC-MS depending on matrix complexity. Its characterization supports impurity profiling under pharmacopeial and ICH impurity assessment frameworks.
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