Description_x000D_ General description_x000D_ This reagent is a 6% recombinant HSA (Human Serum Albumin) in PBS solution, pH 7.4, that can be used as a blank or matrix/diluent for proteinaceous analytes in LC-MS/MS calibrators, controls, or samples.The 6% protein content design is meant to mimic endogenous protein concentration in human serum samples.Beneficially, as the HSA source is recombinant, the matrix should not contain any measurable contaminants typically found in even stripped serum._x000D_ Physical form_x000D_ The product contains 6% recombinant human serum albumin in a PBS solution containing 0.01% ProClin™ 950 as a preservative._x000D_ Preparation Note_x000D_ For more information on other Sigmatrix products visit the Sigmatrix Selection Guide._x000D_ This solution is provided ready to use as a 6% (w/v) Recombinant Human Serum Albumin in Phosphate Buffered Saline, pH 7.4. This formulation has been shown to be appropriate for use as a sample diluent or matrix for preparing calibrants/controls for LC-MS/MS assays._x000D_ Legal Information_x000D_ ProClin is a trademark of The Dow Chemical Company or an affiliated company of Dow