Threonine EP Impurity D, identified as L-Isoleucine (Valine EP Impurity B, CAS 73-32-5), is a chiral, branched-chain amino acid impurity that may co-elute with threonine-related peaks and influence pharmacopoeial acceptance criteria. It shows moderate aqueous solubility and optical activity and is routinely monitored within the impurity profile by reverse phase HPLC with chiral columns or by LC-MS for unambiguous identification. Effective control relies on validated chromatographic separation, defined acceptance limits, stability-indicating assays and investigation of formation pathways during synthesis and storage to ensure reliable quantification, consistent batch release and compliance with regulatory documentation.
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