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On-Site Detection of Tissues of Buffalo Origin by Loop-Mediated Isothermal Amplification (LAMP) Assay Targeting Mitochondrial Gene Sequences

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Abstract

Meat fraud and adulteration is a growing concern in the marketplace today. Species identification in food product is among primary duties of food office control. In this study, a one-step, species-specific, sensitive, and rapid loop-mediated isothermal amplification (LAMP) assay was developed for identification of tissues of buffalo origin. A set of six LAMP primers were designed by targeting mitochondrial cyt b gene. The reaction temperature of LAMP and component of reaction mixture were optimized as 64 °C amplification temperature, 6 U/μL concentration of Bst DNA polymerase, 3 mM concentration of MgSO4, 0.4 mM concentration of dNTP, 0.6 M concentration of betaine, and 1:6 ratio of outer and inner primer pair. Successful amplifications were confirmed using SYBR Green I dye and agarose gel electrophoresis. The specificity of assay was tested with DNA of cattle, goat, sheep, and pig where amplification was observed exclusively in buffalo. The analytical sensitivity of the LAMP assay for buffalo DNA detection was 0.1 pg. The applicability check of developed assay carried out on known/coded samples and binary meat admixture substantiated the accuracy of assay. Supernatant of tissue exposed to Phire Animal Tissue Direct PCR master mix treatment was observed rich enough with DNA of target species and successfully amplified under optimized LAMP reaction. The comparison of results on the samples undergone pre-standardized species-specific PCR taken as gold standard shown complete match with developed species-specific LAMP assay. Hence, the developed species-specific LAMP assays are effective in detection of tissue of buffalo origin.

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Acknowledgments

Authors would like to acknowledge The Director, Indian Veterinary Research Institute and Head, Division of Livestock Products Technology, Indian Veterinary Research Institute, Izatnagar, Bareilly for providing necessary facilities and financial assistance to complete this work.

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Correspondence to Sarita Kumari.

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Sarita Kumari declares that she has no conflict of interest. R. R. Kumar declares that he has no conflict of interest. S. K. Mendiratta declares that he has no conflict of interest. Deepak Kumar declares that he has no conflict of interest. Arun Kumar declares that he has no conflict of interest. Dhananjay Kumar declares that he has no conflict of interest. Preeti Rana declares that she has no conflict of interest. Jyoti Jawla declares that she has no conflict of interest.

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Kumari, S., Kumar, R.R., Mendiratta, S.K. et al. On-Site Detection of Tissues of Buffalo Origin by Loop-Mediated Isothermal Amplification (LAMP) Assay Targeting Mitochondrial Gene Sequences. Food Anal. Methods (2020). https://doi.org/10.1007/s12161-020-01718-2

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Keywords

  • LAMP
  • Buffalo
  • Species specific
  • Sensitivity
  • Mitochondrial cyt b gene