L-Tryptophan Back Catalog number: 72281 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended L-PFOS Sodium perfluoro-1-octanesulfonate, 50µg/ml in MeOH, 1,2ml Price on request MPFAC-C-ES Mass-Labelled PFC Extraction Standard, 2µg/ml in MeOH, 1,2ml Price on request 70447 1-Naphthylamine Price on request