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Dong, Hao; Li, Haixia; Liang, Ming; Luo, Donghui; Liu, Guang; Zeng, Xiaofang; Bai, Weidong; Yang, Juan; Xian, Yanping
Food science & technology, August 2020, 2020-08-00, Letnik: 130Journal Article
N-nitrosodimethylamine (NDMA), belonging to N-nitrosamines (NAs), was detected in several batches of aquatic products in Guangdong, China in 2019, making it urgent to monitor their contamination levels. A salting out homogeneous extraction coupled with GC-MS/MS method was developed for trace analysis of nine NAs in dry-cured mackerel. Results indicated calibration curves were linear from 0.5 to 200 μg/L with R2 higher than 0.9998. LODs and LOQs were in the range of 0.08–0.15 and 0.25–0.5 μg/kg, respectively. Matrix effects ranged from 0.98 to 1.17, which is within the commonly acceptable range. Favorable recoveries (77.1–112.9%) were obtained with RSDs below 7.4%. The proposed method shows rapid extraction time and favorable LODs, recoveries and RSDs which are comparable with other methods. The method was successfully applied for NAs determination in dry-cured mackerel, NDMA is widely detected in all samples with the concentration of 5.3–71.4 μg/kg and almost all kinds of NAs were detected in one sample. •Developed a GC-MS/MS method for analysis of NAs firstly in dry-cured mackerel.•Salting out homogeneous extraction obtained high extraction recoveries for all NAs.•Method showed rapid extraction time and favorable LODs and precisions.•NDMA is widely detected in dry-cured mackerel (5.25–71.35, higher than 4 μg/kg).•Contamination of NAs in dry-cured mackerel is possibly related to dry-cured time.
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