In the method at least two electrodes (1, 2) and fluid reagents (4) are placed in the reaction vessel (3). At least one fluid substrate (11) of the fluid reagents (4) is capable of electric polarization. The reagents (4) are subjected to electric voltage in the form of a series of short electric pulses in such way that unipolar or bipolar electric field pulses are generated. The minimum duration time of electric pulses is from 50 ns and the maximum is 20 ms. The pause between the consecutive pulses is from 0.5 μs to 3 s. In the reactor at least two electrodes (1, 2) are connected to the electric power adaptor delivering unipolar or bipolar pulses of direct or alternating voltage which constitutes the source of the electric field with amplitude exceeding 100V/cm. The electrodes (1, 2) are placed in the reaction vessel (3) filled with fluid reagents (4) which contains at least one liquid substrate (11) capable of electric polarization.