There is a possibility of fungal contamination in cereals during harvesting and storing cereals. Fungal contamination in cereals is a cause of food safety problems as well as deterioration in quality of products and nutritional value. Ergosterol is a component of fungal cell membrane and could be a ...
There is a possibility of fungal contamination in cereals during harvesting and storing cereals. Fungal contamination in cereals is a cause of food safety problems as well as deterioration in quality of products and nutritional value. Ergosterol is a component of fungal cell membrane and could be a biomarker of fungal contamination in cereal samples. In this study, an ergosterol analysis was carried out to assess degree of fungal contamination in cereals, and one appropriate ergosterol analysis process was selected out of three types of methods using high performance liquid chromatography (HPLC). 558 domestic cereal products (107 of brown rice, 119 of millet, 119 of sorghum, 109 of mixed cereal, and 104 of maize) in Korea were analyzed to measure ergosterol amount of contamination. Analyses of the major fungal toxins (aflatoxin, fumonisin, ochratoxin A, deoxynivalenol, and zearelanone) in 558 cereal samples were also carried out by liquid chromatography–tandem mass spectrometry (LC-MS/MS), and incidence of fungal infection was investigated. The recovery rate of ergosterol in the five cereals was determined by Miyagawa method; the recovery rate of intra-day was 85.04-105.03% and the recovery rate of inter-day was 84.28-103.94%. Ergosterol was detected in 530 out of 558 cereal samples. The content of ergosterol was 0.17-6.98 μg/g in brown rice, 1.45-13.04 μg/g in millet, 0.74-18.81 μg/g in sorghum, 0.17-8.58 μg/g in maize, and 0.19-2.91 μg/g in mixed cereal. Ergosterol concentration in 200 cereal samples (50 of brown rice, 50 of millet, 50 of sorghum, and 50 of mixed cereal) was correlated with incidence of fungal infection r = 0.7220. At least one mycotoxin was detected in 432 samples out of a total of 558 samples, and the detection ranges were 0.23-12.40 ng/g for aflatoxins, 1.95-3403.00 ng/g for fumonisins, 12.70-845.00 ng/g for deoxynivalenol, and 0.21-123.00 ng/g for zearelanone, respectively. In case of ochratoxin A, only one mixed cereal was contaminated with 3.87 ng/g. Correlation coefficient between ergosterol content and mycotoxin content was r = 0.6567. Correlation coefficient between incidence of fungal infection and mycotoxin content was r = 0.5600. In the case of organic cereals, ergosterol was detected in 79 samples out of 81 samples in the range of 0.18–6.98 μg/g. In conventional cereals, ergosterol was detected in 164 samples out of 170 samples in the range of 0.45–18.81 μg/g.
There is a possibility of fungal contamination in cereals during harvesting and storing cereals. Fungal contamination in cereals is a cause of food safety problems as well as deterioration in quality of products and nutritional value. Ergosterol is a component of fungal cell membrane and could be a biomarker of fungal contamination in cereal samples. In this study, an ergosterol analysis was carried out to assess degree of fungal contamination in cereals, and one appropriate ergosterol analysis process was selected out of three types of methods using high performance liquid chromatography (HPLC). 558 domestic cereal products (107 of brown rice, 119 of millet, 119 of sorghum, 109 of mixed cereal, and 104 of maize) in Korea were analyzed to measure ergosterol amount of contamination. Analyses of the major fungal toxins (aflatoxin, fumonisin, ochratoxin A, deoxynivalenol, and zearelanone) in 558 cereal samples were also carried out by liquid chromatography–tandem mass spectrometry (LC-MS/MS), and incidence of fungal infection was investigated. The recovery rate of ergosterol in the five cereals was determined by Miyagawa method; the recovery rate of intra-day was 85.04-105.03% and the recovery rate of inter-day was 84.28-103.94%. Ergosterol was detected in 530 out of 558 cereal samples. The content of ergosterol was 0.17-6.98 μg/g in brown rice, 1.45-13.04 μg/g in millet, 0.74-18.81 μg/g in sorghum, 0.17-8.58 μg/g in maize, and 0.19-2.91 μg/g in mixed cereal. Ergosterol concentration in 200 cereal samples (50 of brown rice, 50 of millet, 50 of sorghum, and 50 of mixed cereal) was correlated with incidence of fungal infection r = 0.7220. At least one mycotoxin was detected in 432 samples out of a total of 558 samples, and the detection ranges were 0.23-12.40 ng/g for aflatoxins, 1.95-3403.00 ng/g for fumonisins, 12.70-845.00 ng/g for deoxynivalenol, and 0.21-123.00 ng/g for zearelanone, respectively. In case of ochratoxin A, only one mixed cereal was contaminated with 3.87 ng/g. Correlation coefficient between ergosterol content and mycotoxin content was r = 0.6567. Correlation coefficient between incidence of fungal infection and mycotoxin content was r = 0.5600. In the case of organic cereals, ergosterol was detected in 79 samples out of 81 samples in the range of 0.18–6.98 μg/g. In conventional cereals, ergosterol was detected in 164 samples out of 170 samples in the range of 0.45–18.81 μg/g.
주제어
#에르고스테롤 ergosterol 곰팡이독소 mycotoxins 곡립침해도 fungal infection aflatoxin fumonisin ochratoxin A deoxynivalenol zearelanone
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