Trinitrophenyl Conjugated to BSA - Bader says not IHC reagent?

Bovine serum albumin(BSA), a serum albumin (MW 66 KDa) that has numerous biochemical applications including ELISAs (Enzyme-Linked Immunosorbent Assay), blots, and Immunohistochemistry. It is also used as a nutrient in cell and microbial culture. BSA has 583 aa residues; pI in water at 25oC is 4.7, extinction coefficient, A280 nm=0.667; mg/ml/cm. BSA is conjugated with TNP through lysine residues by amide bonds. Absorption Maximum: 348 nm, Extinction Coefficient at 348nm=11.5 Ratio of 348nm/280nm=2.1 The conjugation of this product is determined at pH 7.4 by measuring TNP absorbance at 348 nm using 1.54 x 10E +04 as the extinction coefficient of TNP and is given as a molar ratio of TNP to BSA the molecular weight of BSA 66 kDa