Eliminating False Positives in PFOS Analysis: The Power of Methanol-Free Separation

Are matrix-derived interferences complicating your PFAS monitoring?

Accurate determination of 𝗽𝗲𝗿𝗳𝗹𝘂𝗼𝗿𝗼𝗼𝗰𝘁𝗮𝗻𝗲𝘀𝘂𝗹𝗳𝗼𝗻𝗶𝗰 𝗮𝗰𝗶𝗱 (𝗣𝗙𝗢𝗦) in food samples is challenging due to bile acid–related compounds (e.g., taurocholic acid isomers). These species can produce the same SRM transition (m/z 499→80) as PFOS, leading to potential false positives without adequate chromatographic separation.

Our latest application note demonstrates how the 𝗬𝗠𝗖 𝗔𝗰𝗰𝘂𝗿𝗮 𝗧𝗿𝗶𝗮𝗿𝘁 𝗖𝟭𝟴 column enables robust separation of PFOS from these interferences:

► 𝗧𝗵𝗲 𝗠𝗲𝘁𝗵𝗮𝗻𝗼𝗹-𝗙𝗿𝗲𝗲 𝗔𝗱𝘃𝗮𝗻𝘁𝗮𝗴𝗲: While methanol is commonly used in PFAS analysis, it can promote co-elution of PFOS and bile acid isomers. Switching to an acetonitrile-based mobile phase enabled complete chromatographic separation under the evaluated conditions.

► 𝗕𝗶𝗼𝗶𝗻𝗲𝗿𝘁 𝗛𝗮𝗿𝗱𝘄𝗮𝗿𝗲: The YMC Accura (bio)inert coated stainless steel hardware minimizes unwanted interactions between analytes and metal surfaces, improving reliability in complex matrices.

► 𝗣𝗿𝗼𝘃𝗲𝗻 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲: Across challenging food matrices (meat, egg, fish, vegetables), the method achieved strong recoveries (generally 80–120%) and high precision (RSD <15%) at trace levels.

From short-chain (C4) to long-chain PFAS, Triart C18 provides the retention, selectivity, and robustness needed for routine LC-MS/MS workflows.

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