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Detection of the Bovine Milk Adulterated in Camel, Horse, and Goat Milk Using Duplex PCR

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Abstract

Food ingredient adulteration, especially the adulteration of milk and dairy products, is one of the important issues of food safety. A rapid, simple, sensitive, specific, and low-cost DNA detection method was established to screen bovine milk adulterated in three different kinds of special milk (camel, horse, and goat milk). This method can detection both bovine milk and special milk in a single duplex polymerase chain reaction (duplex PCR). In this study, specific primers of duplex PCR were designed based on 16S-RNA genes from camel and bovine mitochondria and D-LOOP genes from horse and goat mitochondria. The designed primers had good specificity and could accurately amplify the target fragments (711 bp, 584 bp, 241 bp, and 184 bp). The duplex PCR was applied to the binary mixtures of raw milk fixed percentage and processed dairy products (freeze-dried, pasteurized, and ultra-high temperature (UHT) sterilized with the same mixtures and commercial samples). The limit of detection (LOD) of special milk adulterated with bovine milk was 0.1% in raw milk mixture. Pasteurized and UHT sterilized raised the LOD to 0.2% and 0.5%, but freeze-dried did not raise the LOD. Duplex PCR maintained preferable selectivity and sensitivity in the detection of samples with different processed, and it is expected to be used in market detection.

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Funding

This study was funded by projects of the National Natural Science Foundation of China (31471645) and program of Key Research and Development Projects in Xinjiang province (2018B01003).

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Contributions

Lu Deng and Aili Li were responsible for the acquisition, analysis, and interpretation of data for the work. Yang Gao and Rongrong Li were responsible for revising it critically for important intellectual content. Tong Shen and Haitao Yue were responsible for the conception or design of the work. Jing Miao was responsible for drafting the work for important intellectual content. Jie Yang agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

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Correspondence to Jie Yang.

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Conflict of Interest

Lu Deng declares that she has no conflict of interest. Aili Li declares that she has no conflict of interest. Yang Gao declares that he has no conflict of interest. Tong Shen declares that she has no conflict of interest. Haitao Yue declares that he has no conflict of interest. Jing Miao declares that she has no conflict of interest. Rongrong Li declares that she has no conflict of interest. Jie Yang declares that she has no conflict of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Informed consent was obtained from all individual participants included in the study.

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Deng, L., Li, A., Gao, Y. et al. Detection of the Bovine Milk Adulterated in Camel, Horse, and Goat Milk Using Duplex PCR. Food Anal. Methods 13, 560–567 (2020). https://doi.org/10.1007/s12161-019-01678-2

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  • DOI: https://doi.org/10.1007/s12161-019-01678-2

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