Enzyme-substrate reactions in very high magnetic fields. II.

We have examined the effect of conditioning the enzyme trypsin in solution at pH 8.2 in a large magnetic field before determining its reactivity towards a synthetic substrate N-benzoyl DL-arginine p-nitroanilide (BAPA). This "pretreatment" was allowed to proceed for as long as 3(2/3) hr in a magnetic field of 208 kgauss at temperatures 26 and 36 degrees C. No effect on reactivity was observed when such pretreated enzyme solutions were compared with identical but untreated enzyme solutions. A single such reaction, allowed to proceed directly in a magnetic field of 220 kgauss for 9 min, similarly showed no difference in rate from its control.