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The oxidation potential of common bacterial and fungal aerosols in the atmosphere as well as their key influential factors was evaluated using the dithiothreitol (DTT) method. The results showed that bioaerosols induced reactive oxygen species (ROS) production, varying along the microorganism type, species, and concentration. The oxidative potential of fungi was approximately 2 to 3 times higher than that of bacteria. When the test bioaerosl concentrations were set highest (105CFU/mL), Staphylococcus aureus [(0.41 ± 0.06) nmol/(min·mL)] and Penicillium [(1.32 ± 0.11) nmol/(min·mL)] exhibited the strongest oxidative potential, averaging about 1.5times higher than other bacteria and fungi. The oxidation potential of bioaerosols was also significantly associated with their activity and chemical components. Microbial activity was a key factor regulating oxidative potential, with inactivation treatment reducing it by up to 40%. The consumption rate of DTT when biological components (Staphylococcus aureus/Penicillium) and chemical components (Cu/1, 4-NQ) were simultaneously present in the system was lower than that of the single component. It indicated that there was an interaction between the two components that inhibited the DTT consumption reaction.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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