Fig 4. Collecting ability of electret filters in collecting atomized protein particles.

(a) Amounts of collected albumin when the volume of atomized albumin solution increased. Amounts of collected albumin increased as the volume of atomized albumin solution increased before point A, then decreased, and finally increased again after point B. (b) Amounts of collected CEA when the volume of atomized CEA solution increased. Amounts of collected CEA increased as the volume of atomized CEA solution increased before point C, then decreased, and finally increased again after point D. (c) Mean collecting efficiency of electret filters when the volume of atomized albumin solution increased. (d) Mean collecting efficiency of electret filters when the volume of atomized CEA solution increased. Amounts of collected proteins were calculated by Eq 2. Collecting efficiencies were calculated by Eq 3. Error bars shown in a) and b) were standard deviation of triplicate experiments.