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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Russian Journal of Biotherapy</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Biotherapy</journal-title><trans-title-group xml:lang="ru"><trans-title>Российский биотерапевтический журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1726-9784</issn><issn publication-format="electronic">1726-9792</issn><publisher><publisher-name xml:lang="en">Publishing House ABV Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">1418</article-id><article-id pub-id-type="doi">10.17650/1726-9784-2023-22-4-68-75</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ORIGINAL REPORTS</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Modeling the release of vinpocetine from microcapsules based on sodium alginate and chitosan by molecular dynamics</article-title><trans-title-group xml:lang="ru"><trans-title>Моделирование высвобождения винпоцетина из микрокапсул на основе альгината натрия и хитозана методом молекулярной динамики</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0123-9526</contrib-id><name-alternatives><name xml:lang="en"><surname>Polkovnikova</surname><given-names>Yu. A.</given-names></name><name xml:lang="ru"><surname>Полковникова</surname><given-names>Ю. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>1 Universitetskaya pl., Voronezh 394018</p></bio><bio xml:lang="ru"><p>394018 Воронеж, Университетская пл., 1</p></bio><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Voronezh State University</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО «Воронежский государственный университет»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-11-23" publication-format="electronic"><day>23</day><month>11</month><year>2023</year></pub-date><volume>22</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>68</fpage><lpage>75</lpage><history><date date-type="received" iso-8601-date="2023-11-23"><day>23</day><month>11</month><year>2023</year></date><date date-type="accepted" iso-8601-date="2023-11-23"><day>23</day><month>11</month><year>2023</year></date></history><permissions><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://bioterapevt.abvpress.ru/jour/article/view/1418">https://bioterapevt.abvpress.ru/jour/article/view/1418</self-uri><abstract xml:lang="en"><p><bold>Introduction.</bold> when developing the composition of drugs, an actual direction is the use of computer modeling methods, including the methods of molecular dynamics (MD), which significantly expanded the possibilities of chemistry, providing spatial and temporal resolution that is inaccessible in experiments.<bold>Aim.</bold> To simulation of the release of vinpocetine from sodium alginate with a shell of chitosan into solvent media by the method of MD to determine the characteristics of computer simulation, which makes it possible to obtain microcapsules with desired biopharmaceutical properties. <bold>Materials and methods</bold>. To simulate the release of vinpocetine from sodium alginate with a shell of chitosan, the MD method in the GROMOS 54a7 force field was used using the Gromacs 2019 program. Using the HyperChem 8.0.1 program, the molecules of the components of the simulated systems were constructed. The models were parameterized using the Internet service Automated Topology Builder (http://atb.uq.edu.au/).<bold>Results.</bold> Based on the results of MD modeling, the van der waals interaction energies of vinpocetine with sodium alginate (alginic acid), with chitosan (chitosan-cation) and with a solvent in terms of 1 molecule of vinpocetine were calculated. The fractions of vinpocetine molecules not bound to the polymer were also calculated. It has been established that the average values of the energy of the van der waals interaction between vinpocetine and the solvent in an acidic medium are lower than in a neutral medium. Also, in an acidic environment, in contrast to a neutral environment, a slight release of vinpocetine is observed.<bold>Conclusion. </bold>In the course of the experiment, it was found that at pH 2.0, chitosan dissolves in an aqueous medium and a slight release of vinpocetine from alginic acid into an aqueous solution of chitosan is observed (the average proportion of vinpocetine molecules not associated with sodium alginate (alginic acid) and chitosan is 2.16 ± 2.33 %), the release of vinpocetine into water at pH 6.8 is not observed.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Введение</bold>. При разработке состава лекарственных препаратов актуальным направлением является применение методов компьютерного моделирования, в том числе методов молекулярной динамики (МД), которая значительно расширила возможности химии, обеспечив пространственное и временно́е разрешение, недоступное в экспериментах.<bold>Цель исследования </bold>– моделирование высвобождения винпоцетина из альгината натрия с оболочкой из хитозана в среды растворения методом МД для определения характеристик компьютерного моделирования, позволяющих получать микрокапсулы с заданными биофармацевтическими свойствами.<bold>Материалы и методы</bold>. Для моделирования высвобождения винпоцетина из альгината натрия с оболочкой из хитозана использован метод МД в силовом поле GROMOS 54a7 с использованием программы Gromacs 2019. С помощью программы HyperChem 8.0.1 построены молекулы компонентов моделируемых систем. Параметризация моделей производилась посредством интернет-сервиса Automated Topology Builder (http://atb.uq.edu.au/).<bold>Результаты.</bold> По результатам моделирования МД рассчитаны энергии ван-дер-ваальсова взаимодействия винпоцетина с альгинатом натрия (альгиновой кислотой), хитозаном (хитозаном-катионом) и растворителем в пересчете на 1 молекулу винпоцетина. Рассчитывались также доли молекул винпоцетина, не связанных с полимером. Определено, что средние значения энергии ван-дер-ваальсова взаимодействия между винпоцетином и растворителем в кислой среде меньше, чем в нейтральной среде. В кислой среде, в отличие от нейтральной, наблюдается незначительное высвобождение винпоцетина.<bold>Заключение</bold>. В ходе проведенного эксперимента установлено, что при pH 2,0 наблюдается растворение хитозана в водной среде и незначительное высвобождение винпоцетина из альгиновой кислоты в водный раствор хитозана (средняя доля молекул винпоцетина, не связанных с альгинатом натрия (альгиновой кислотой) и хитозаном, составляет 2,16 ± 2,33 %), высвобождение винпоцетина в воду при pH 6,8 не наблюдается.</p></trans-abstract><kwd-group xml:lang="en"><kwd>molecular dynamics</kwd><kwd>microcapsules</kwd><kwd>sodium alginate</kwd><kwd>chitosan</kwd><kwd>vinpocetine</kwd><kwd>van der waals interaction energies</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>молекулярная динамика</kwd><kwd>микрокапсулы</kwd><kwd>альгинат натрия</kwd><kwd>хитозан</kwd><kwd>винпоцетин</kwd><kwd>энергии ван-дер-ваальсова взаимодействия</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Hagras N.A., Mogahed N., Sheta E. et al. 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