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BPE-DNPH solid phase extraction (SPE) Cartridge, bed B 270 mg (DNPH-coated silica), bed A 130 mg (2-BPE coated silica), volume 3 mL, pkg of 10 ea
BPE-DNPH solid phase extraction (SPE) Cartridge, volume 3 mL, bed B 270 mg (DNPH-coated silica), bed A 130 mg (2-BPE coated silica), pkg of 50 ea