Interspecies and seasonal differences of retinol in dairy ruminant´s milk

Authors

  • Lucia Hodulová Veterinary and Pharmaceutical University Brno, Faculty of Veterinary Hygiene and Ecology, Department of Milk Hygiene and Technology, Palackého tř. 1/3, 612 42 Brno
  • Lenka Vorlová Veterinary and Pharmaceutical University Brno, Faculty of Veterinary Hygiene and Ecology, Department of Milk Hygiene and Technology, Palackého tř. 1/3, 612 42 Brno
  • Romana Kostrhounová Veterinary and Pharmaceutical University Brno, Faculty of Veterinary Hygiene and Ecology, Department of Milk Hygiene and Technology, Palackého tř. 1/3, 612 42 Brno
  • Marcela Klimešová-Vyletělová Výzkumný ústav mlékárenský, s.r.o. Ke Dvoru 12a, 160 00 Praha 6
  • Jan Kuchtí­k Mendel University in Brno, Zemědělská 1, 613 00 Brno

DOI:

https://doi.org/10.5219/436

Keywords:

milk, retinol, season, small ruminant

Abstract

Milk is an essential source of macronutrients and among lipophilic vitamins is significant source of retinol. The contribution of milk to the reference daily intake for retinol varies from 11% to 16%, worldwide. The most consumed dairy products are fresh, dehydrated and condensed milk in which the amonuts of retinol are not modified to those of in whole milk. Retinol is essential to ensure a good functionality of the immune system and plays a critical role in vision, reproduction, cell differentiation as well as growth and development and is found only in animal tissues. The aim of our study was to evaluate the interspecies differences in the retinol concentration of whole raw bovine, caprine and ovine milk and to observe seasonal variation of retinol in bulk tank milk samples. Samples of raw milk were colleceted on different farms in the Czech Republic between 2013 and 2014. Retinol was measured by ultra high performance liquid chromatography with UV detection (325 nm) in isocratic mode after alkaline saponification with methanolic potassium hydroxide solution and liquid-liquid extraction into non polar organic solvent of whole raw milk. To avoid vitamin losses or degradation during the procedure, antioxidants were added to the sample extraction media. Our results indicate significant interspecies differences between bovine and ovine milk and caprine and ovine milk. Concentration of retinol is very similar in bovine and caprine milk 0.96 ±0.11 mg/L, 0.94 ±0.25 mg/L, respectively. The mean concentration in sheep´s milk is 1.75 ±0.24 mg/L. The seasonal variation of retinol in raw bovine milk was detected as high significant, with the highest concentration during winter. These results contribute to the nutrition evaluation of milk in the Czech Republic and indicate, that the sheep´s milk is the best source of retinol among the milks of ruminants kept in the Czech Republic, however it is not used in its fluid form for human consumption.

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Published

2015-07-07

How to Cite

Hodulová, L. ., Vorlová, L. ., Kostrhounová, R. ., Klimešová-Vyletělová, M. ., & Kuchtí­k, J. . (2015). Interspecies and seasonal differences of retinol in dairy ruminant´s milk. Potravinarstvo Slovak Journal of Food Sciences, 9(1), 201–205. https://doi.org/10.5219/436

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