Abstract:By investigating the contamination of Burkholderia gladioli in rice and edible starch which commonly used in the food industry in some provinces of southern China, it is the first time that Pseudomonas cocovenenans subsp. farinofermentans was isolated and identified from imported broken rice, which provided early warning of potential risk. In this study, 129 samples including 47 rice, 18 broken rice, 64 edible starch were collected from southern provinces where “bongkrekic acid poisoning incident” had occurred. Burkholderia gladioli and bongkrekic acid were detected according to GB/T 4789.29-2003 and GB 5009.189-2016, respectively. The results showed that 6 strains of Burkholderia gladioli were isolated and identified from 4 imported broken rice and 1 domestic broken rice, and the detection rate in broken rice samples was 27.78% (5/18); through toxin-producing cultivation and toxicity test, 4 strains produced bongkrekic acid. The mice all died within 24 hours after oral gavage of crude toxin extract. It was confirmed that the toxin was Pseudomonas cocovenenans subsp. farinofermentans, and all derived from 4 imported broken rice samples (two of them were detected with bongkrekic acid), accounting for 23.53% (4/17) of imported broken rice samples. It shows that there are safety risks in imported broken rice, and the relevant enterprises and regulatory authorities should strengthen the risk prevention and control.
