2.2.32. LOSS ON DRYING

EUROPEAN PHARMACOPOEIA Loss on dryingTable Preparation of stacking gelComponent volumes (mL) per gel mould volume ofSolution components1mL2mL3mL4mL5mL6mL8mL10 mLWater solution(1) M Tris (pH )(2) g/L SDS(3) g/L APS(4) (5) (1) Acrylamide solution:30 per cent acrylamide/bisacrylamide (29:1) solution R.(2) M Tris (pH ):1 M tris-hydrochloride buffer solution pH R.(3) 100 g/L SDS: a 100 g/L solution ofsodium dodecyl sulfate R.(4) 100 g/L APS: a 100 g/L solution ofammonium persulfate R. Ammonium persulfate provides the free radicals that drive polymerisation ofacrylamide and bisacrylamide.

— a system for pulsed field gradient NMR. The high magnetic field is generated by a superconducting coil in a Dewar flask filled with liquid helium. The probe typically contains the sample in a 5 mm-outer-diameter sample tube or in a flow cell, and is connected to the electronics cabinet by RF cables carrying lock,1H-, and X-nucleus ...

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