Agilent, G2455-85001, Obsolete. HSA Peptide Standard Mix Kit

The Agilent HSA Peptide Standard Mix Kit is an obsolete reference-material kit formerly used in LC and LC/MS peptide analysis. The kit contains two lyophilized peptide standard vials, each identified as a 0.5 mL vial format, for preparation of repeatable analytical test solutions. Peptide reference mixtures help laboratories examine chromatographic separation, mass spectrometric detection and suitability of analytical conditions across runs. The HSA designation distinguishes this preparation from general-purpose multi-peptide mixtures or intact-protein standards. Because the product is obsolete, its identification should be retained in historical methods, validation files and inventory records rather than treated as a current replacement recommendation. Laboratories transferring an established HSA peptide method should first compare analyte identity, reconstitution instructions and expected retention or mass responses before selecting another standard. A substitute with a different peptide composition is not automatically equivalent even if used in the same LC/MS workflow.