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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">foodsyst</journal-id><journal-title-group><journal-title xml:lang="en">Food systems</journal-title><trans-title-group xml:lang="ru"><trans-title>Пищевые системы</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2618-9771</issn><issn pub-type="epub">2618-7272</issn><publisher><publisher-name>Федеральный научный центр пищевых систем им. В.М. Горбатова РАН</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21323/2618-9771-2020-4-2-134-143</article-id><article-id custom-type="elpub" pub-id-type="custom">foodsyst-114</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group></article-categories><title-group><article-title>Use of nanofiltration concentrates of buttermilk and whey for fermented dairy products with increased mass content of protein</article-title><trans-title-group xml:lang="ru"><trans-title>Использование нанофильтрационных концентратов пахты и сыворотки для кисломолочных продуктов с повышенной массовой долей белка</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5073-756X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Острецова</surname><given-names>Н. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Ostreczova</surname><given-names>N. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Острецова Надежда Геннадьевна — кандидат технических наук, доцент, кафедра технологии молока и молочных продуктов</p><p>160555, Вологда, Молочное, ул. Шмидта, 2</p></bio><bio xml:lang="en"><p>Nadezhda G. Ostreczova — candidate of technical sciences, docent, Department of Milk and Dairy Products Technology</p><p>2, Shmidta str.,160555, Vologda, Molochnoe</p></bio><email xlink:type="simple">lugovaya22@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0335-8820</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Боброва</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Bobrova</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Боброва Анна — кандидат технических наук, кафедра технологии молока и молочных продуктов</p><p>160555, Вологда, Молочное, ул. Шмидта, 2</p></bio><bio xml:lang="en"><p>Anna V. Bobrova — candidate of technical sciences, Department of Milk and Dairy Products Technology</p><p>2, Shmidta str.,160555, Vologda, Molochnoe</p></bio><email xlink:type="simple">anna.chekaleva@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Вологодская государственная молочнохозяйственная академия имени Н. В. Верещагина</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Vologda State Dairy Farming Academy named after N. V. Vereshchagin</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>22</day><month>07</month><year>2021</year></pub-date><volume>4</volume><issue>2</issue><fpage>134</fpage><lpage>143</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ostreczova N.G., Bobrova A.V., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Острецова Н.Г., Боброва А.В.</copyright-holder><copyright-holder xml:lang="en">Ostreczova N.G., Bobrova A.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.fsjour.com/jour/article/view/114">https://www.fsjour.com/jour/article/view/114</self-uri><abstract><p>Baromembrane methods, in particular, nanofiltration, open up broad opportunities in the field of obtaining dairy products with a high protein content in terms of quality and energy saving. This paper describes the feasibility of using buttermilk and cheese whey concentrates obtained by nanofiltration in the production of fermented milk products. The physicochemical, rheological and organoleptic studies of nanofiltration concentrates of buttermilk and cheese whey made it possible to select concentrates with a mass fraction of dry substances of 20% for further research. Electron microscopic studies of the microstructure of buttermilk, whey and their concentrates with a mass fraction of dry substances of 20% showed that when buttermilk was concentrated by nanofiltration, the average diameter of dispersed particles did not increase and amounted to (130 ± 30) nm. The grid cells size decreased by 3.2 times; in serum concentration, the particle size increased by 1.7 times with a decrease in the grid cells size by 1.3 times. The obtained data make it possible to predict the positive effect of this concentration method on the consistency of fermented milk products. The use of the combined milk base with a ratio of buttermilk concentrate (20% dry matter) to whey concentrate (20% dry matter) of 50:50 and 75:25 is substantiated, providing a complete protein content of 4.4–5.6% in fermented milk products. A high rate of acid formation and a good water-holding capacity of acid clots were established when fermenting with a starter culture containing thermophilic streptococcus and acidophilic bacillus in a ratio of 4:1. The obtained results make it possible to expand the range of fermented milk products with an increased mass fraction of protein for good nutrition of the population.</p></abstract><trans-abstract xml:lang="ru"><p>Широкие возможности в  области получения молочных продуктов с  повышенным содержанием белка с точки зрения качества и энергосбережения открывают баромембранные методы, в частности, нанофильтрация. В данной работе описывается целесообразность использования концентратов пахты и подсырной сыворотки, полученных нанофильтрацией, в производстве кисломолочных продуктов. Комплекс физико-химических, реологических и органолептических исследований нанофильтрационных концентратов пахты и  подсырной сыворотки позволил выбрать для дальнейших исследований концентраты с  массовой долей сухих веществ 20%. Электронно-микроскопические исследования микроструктуры пахты, сыворотки и их концентратов с массовой долей сухих веществ 20% показали, что при концентрировании пахты нанофильтрацией средний диаметр дисперсных частиц не увеличился и  составил (130 ± 30) нм. При этом размер ячеек пространственной сетки уменьшился в 3,2 раза, а при концентрировании сыворотки размер частиц увеличился в 1,7 раза при уменьшении размера ячеек пространственной сетки в 1,3 раза. Полученные данные позволяют прогнозировать положительное влияние данного способа концентрирования на консистенцию кисломолочных продуктов. Обосновано использование комбинированной молочной основы с соотношением концентрата пахты (20% сухих веществ) к концентрату сыворотки (20% сухих веществ) 50:50 и 75:25, что обеспечивает содержание полноценного белка 4,4–5,6% в  кисломолочных продуктах. Установлена высокая скорость кислотообразования и  хорошая влагоудерживающая способность кислотных сгустков при сквашивании закваской, содержащей термофильный стрептококк и ацидофильную палочку в соотношении 4:1. Полученные результаты позволяют расширить ассортимент кисломолочных продуктов с повышенной массовой долей белка для полноценного питания населения.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>пахта</kwd><kwd>подсырная сыворотка</kwd><kwd>нанофильтрация</kwd><kwd>концентрат</kwd><kwd>кисломолочный продукт</kwd><kwd>ацидофильная палочка</kwd><kwd>термофильный стрептококк</kwd></kwd-group><kwd-group xml:lang="en"><kwd>buttermilk</kwd><kwd>cheese whey</kwd><kwd>nanofiltration</kwd><kwd>concentrate</kwd><kwd>fermented milk product</kwd><kwd>acidophilus bacillus</kwd><kwd>thermophilic streptococcus</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Банникова, А.В, Евдокимов, И.А. (2012). 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