Added chemicals Average population (n=3), CFU/carrier Exposure time (min) 3 10 Not added (Control) 1.10×105 1.67×103 CaCO3 1.28×105 2.08×103 0.2% Calcium lactate 1.37×105 2.95×103 0.5% Glucose 1.26×105 1.98×103 0.5% Sodium pyruvate 1.07×105 1.41×103 L-alanine at 100 μg/ml 1.27×105 1.97×103 D-alanine at 100 μg/ml 1.07×105 1.28×103 0.1% Panvitan powder 1.22×105 1.68×103 0.1% Amino acids mixture 1.25×105 1.90×103 Initial population was 3.5×106 CFU/carrier

Table 8: Recovery effect of several sorts of chemicals on SCDA culture medium from N company.