Determination of combined vitamin preparations antioxidant capacity by a potentiometric / E. R. Gazizullina, D. S. Timina, M. V. Borisova [et al.] // XXI Mendeleev Congress on general and applied chemistry, 9-13 September, 2019, Saint Petersburg : book of abstract in 6 volumes. - Saint Petersburg, 2019. - Vol. 4 : Chemistry of fossils and renewable hydrocarbon raw materials. Analytical chemistry: new methods and devices for chemical research and analysis. Chemical education. - 2019. - P. 240.