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or dry ash and dissolution according to the BeO procedure above)
δ13C: -25
Propranolol-d7 (naphthyl-d7)
but with nitrite test pad
110235-47-7
EC HPLC guard column (analytical), NUCLEODUR 100-5 NH2-RP, 5 µm, 4x3 mm Citrate or dry ash and dissolutionFor protection of your main HPLC column from contamination, it is recommended to use guard columns. These short columns are placed into a guard column holder. The guard column holder in combination with a guard column inside is installed between the injector and the HPLC column. This installation prevents chemical impurities to reach the main column. Because a contamination could form an irreversible bond with the column packing material (stationary
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