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Title of article NEW DETERMINATION METHOD FOR THE RATIO OF THE RELATIVE PROPORTIONS OF ϰ-CASEIN ALLELES IN MILK POWDER
Authors

Gilmanov K., Cand.Sci.(Bio.), Researcher, All-Russian Dairy Research Institute, kh_gilmanov@vnimi.org

Semipyatniy V., Cand.Sci.(Eng.), All-Russian Dairy Research Institute, semipyatniy@gmail.com

Bigaeva A., Junior Researcher, All-Russian Dairy Research Institute, a_bigaeva@vnimi.org

Vafin R., Dr.Sci.(Bio.), Professor of the RAS, Senior Researcher, All-Russian Dairy Research Institute, r_vafin@vnimi.org

Turovskaya S., Senior Researcher, All-Russian Dairy Research Institute, s_turovskaya@vnimi.org

Section
Year 2020 Issue 3 UDC 637.07:637.05
DOI 10.21603/2074-9414-2020-3-525-535
Abstract Introduction. High-quality dairy products depend on the properties of raw materials. Milk is the basic raw material for all dairy products. Its quality is subject to requirements of biological safety, and its physicochemical and technological properties comply with strict indicators. ϰ-casein gene is a basic milk protein. Its allelic variants affect milk productivity, as well as its composition and technological properties, e.g. cheeseability and heat resistance. The research objective was to develop a new method for determining the ratio of the relative proportions of selection-significant kappa-casein gene alleles in bulk cow’s milk powder by means of molecular genetics and bioinformation system. The method can help to test raw materials for further processing rationality.
Study objects and methods. The research included a genetic analysis of samples of bulk whole milk powder, bulk powdered skimmed milk, and bulk raw milk. The developed method involved DNA extraction, combined PCR-RFLP technique, electrophoretic results, and analysis detection of information data using new mathematical algorithms and software.
Results and discussion. The ratio of the relative proportions of the kappa-casein gene alleles in milk powder was determined using primer sets JK5 and JK3, as well as restriction endonuclease HinfI for PCR-RFLP analysis. The experiment showed satisfactory reproducibility and interpretation of the obtained data. The program provided a ratio calculation of the kappa-casein gene alleles relative proportions in the studied milk powder samples, expressed as a percentage of the A allele proportion with additional indication of the absolute and relative errors. It also placed the information block of the generated numerical indicators into the percentage scale.
Conclusion. The developed methodology was implemented by a set of laboratory procedures. The new specialized program «Calculation of the relative proportions ratio of ϰ-casein alleles in bulk milk» is on open access. It provides a correct and prompt data interpretation, generated during the analysis of dry milk raw materials of bulk origin.
Keywords Milk products, casein, heat resistance, cheese suitability, allele, CSN3, PCR, RFLP, algorithms
Artice information Received August 13, 2020
Accepted September 25, 2020
Available online October 8, 2020
For citation Gilmanov KhKh, Semipyatnyi VK, Bigaeva AV, Vafin RR, Turovskaya SN. New determination method for the ratio of the relative proportions of ϰ-casein alleles in milk powder. Food Processing: Techniques and Technology. 2020;50(3):525–535. (In Russ.). DOI: https://doi.org/10.21603/2074-9414-2020-3-525-535.
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