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Outline
To analyze the contamination status and influencing factors of Burkholderia gladioli(Pseudomonas cocovenenans subsp. farino fermentans) and bongkrekic acid in edible fungus in Guangzhou City.
Samples of 480 pieces of dried black fungus and fresh silver fungus were collected from marketplaces,supermarkets, stores, online stores and catering units. Accordance with GB 4789.29—2020 National food safety standard-Food microbiology inspection-Inspection of Burkholderia gladioli (Pseudomonas cocovenenans subsp.farino fermentans), and the strain identification was carried out. The liquid chromatography-mass spectrometry method was used to detect the bongkrekic acid in samples.
It showed that no bongkrekic acid was detected in 480 samples. The detection rate of Burkholderia gladioli was 16.88% (81/480). There was no statistically significant difference in the detection rate of Burkholderia gladioli among food categories, sampling sites, packaging types and materials (P>0.05). The detection rates of Burkholderia gladioli were different in sample origin, sampling quarter and the detection of mold, which were statistically significant (P<0.05). Multivariate logistic regression found that samples from the first quarter (March) had a higher risk of contamination by Burkholderia gladioli than those from the other 3 quarters. The toxicity test identified 5 strains as Pseudomonas cocovenenans subsp. farino fermentans, from 4 samples of wet black fungus and 1 sample of fresh silver ear, all collected in the second quarter.The difference in the sampling quarters of Burkholderia gladioli (Pseudomonas cocovenenans subsp. farino fermentans) was statistically significant (P<0.05).
In the market circulation process, Burkholderia gladioli is prone to grow in foods such as wet black fungus and fresh silver ear fungus, and there is a risk of producing bongkrekic acid. Therefore, it is necessary to strengthen the monitoring of this pathogenic bacterium(Pseudomonas cocovenenans subsp. farino fermentans) in key foods (with particular attention paid to the second quarter during the market circulation process).
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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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