<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" "JATS-journalpublishing1-3.dtd">
<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="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">pharmjournal</journal-id><journal-title-group><journal-title xml:lang="ru">Разработка и регистрация лекарственных средств</journal-title><trans-title-group xml:lang="en"><trans-title>Drug development &amp; registration</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2305-2066</issn><issn pub-type="epub">2658-5049</issn><publisher><publisher-name>LLC «CPHA»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.33380/2305-2066-2022-11-3-75-83</article-id><article-id custom-type="elpub" pub-id-type="custom">pharmjournal-1287</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>ФАРМАЦЕВТИЧЕСКАЯ ТЕХНОЛОГИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHARMACEUTICAL TECHNOLOGY</subject></subj-group></article-categories><title-group><article-title>Природные глубокие эвтектические растворители как альтернативные экстрагенты флавоноидов из растительного сбора седативного действия</article-title><trans-title-group xml:lang="en"><trans-title>Natural Deep Eutectic Solvents as Alternative Flavonoid Extractants from the Sedative Plant Composition</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2673-6203</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Джавахян</surname><given-names>М. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Dzhavakhyan</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>117216, г. Москва, ул. Грина, д. 7, стр. 1;</p><p>119991, г. Москва, Ленинские горы, д. 1</p></bio><bio xml:lang="en"><p>7/1, Greena str., Moscow, 117216;</p><p>1, Leninskie gory, Moscow, 119991</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4803-5133</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Прожогина</surname><given-names>Ю. Э.</given-names></name><name name-style="western" xml:lang="en"><surname>Prozhogina</surname><given-names>Yu. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>119991, г. Москва, Ленинские горы, д. 1</p></bio><bio xml:lang="en"><p>1, Leninskie gory, Moscow, 119991</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2397-8920</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Павельева</surname><given-names>О. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Pavelieva</surname><given-names>O. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>117216, г. Москва, ул. Грина, д. 7, стр. 1</p></bio><bio xml:lang="en"><p>7/1, Greena str., Moscow, 117216</p></bio><email xlink:type="simple">pavelieva.olesya@yandex.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0068-2788</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Каленикова</surname><given-names>Е. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Kalenikova</surname><given-names>E. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>119991, г. Москва, Ленинские горы, д. 1</p></bio><bio xml:lang="en"><p>1, Leninskie gory, Moscow, 119991</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБНУ «Всероссийский научно-исследовательский институт лекарственных и ароматических растений» (ВИЛАР);&#13;
ФГБОУ ВО «Московский государственный университет имени М. В. Ломоносова» (МГУ имени М. В. Ломоносова)</institution></aff><aff xml:lang="en"><institution>All-Russian Scientific Research Institute of Medicinal and Aromatic Plants;&#13;
Lomonosov Moscow State University</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ФГБОУ ВО «Московский государственный университет имени М. В. Ломоносова» (МГУ имени М. В. Ломоносова)</institution></aff><aff xml:lang="en"><institution>Lomonosov Moscow State University</institution></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>ФГБНУ «Всероссийский научно-исследовательский институт лекарственных и ароматических растений» (ВИЛАР)</institution></aff><aff xml:lang="en"><institution>All-Russian Scientific Research Institute of Medicinal and Aromatic Plants</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>30</day><month>08</month><year>2022</year></pub-date><volume>11</volume><issue>3</issue><fpage>75</fpage><lpage>83</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Джавахян М.А., Прожогина Ю.Э., Павельева О.К., Каленикова Е.И., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Джавахян М.А., Прожогина Ю.Э., Павельева О.К., Каленикова Е.И.</copyright-holder><copyright-holder xml:lang="en">Dzhavakhyan M.A., Prozhogina Y.E., Pavelieva O.K., Kalenikova E.I.</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.pharmjournal.ru/jour/article/view/1287">https://www.pharmjournal.ru/jour/article/view/1287</self-uri><abstract><sec><title>Введение</title><p>Введение. Природные глубокие эвтектические растворители [deep eutectic solvents (DESs)] являются перспективными экстрагентами для многих биологически активных веществ (БАВ) из растительного сырья. Они биодеградируемы, безопасны, стабильны, их производство доступно и легко осуществимо, а эффективность экстракции сопоставима с известными органическими растворителями. В связи с этим интерес к глубоким эвтектическим растворителям неуклонно растет в последние годы, и они находят применение в различных областях – химии, фармацевтике и пищевой промышленности.</p></sec><sec><title>Цель</title><p>Цель. Целью настоящей работы было изучить возможность экстракции флавоноидов из растительного сырья посредством глубоких эвтектических растворителей, а также сопоставить эффективность их экстракции с традиционными растворителями.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Экстракцию флавоноидов проводили из сбора растительной композиции, состоящей из травы пустырника сердечного (пустырника обыкновенного) (Leonurus cardiaca L.), травы зверобоя продырявленного (Hypericum perforatum L.), травы мелиссы лекарственной (Melissa officinalis L.) и травы тимьяна ползучего (чабреца) (Thymus serpyllum L.) в соотношении 4 : 2,5 : 2,5 : 1, измельченных до размера частиц 2–3 мм. В качестве экстрагентов использовались 21 эвтектический растворитель на основе бетаина гидрохлорида и холина битартрата в качестве акцепторов водородной связи.</p></sec><sec><title>Результаты и обсуждение</title><p>Результаты и обсуждение. Исследована экстрагирующая способность 21-го экспериментального состава DESs. Изучены влияние содержания воды в составе DES, а также воздействие температуры на процесс экстракции. Количественное определение флавоноидов в пересчете на рутин проводилось методом дифференциальной спектрофотометрии при длине волны 410 ± 2 нм. Максимальный выход флавоноидов был достигнут при использовании 40%-го водного раствора DES на основе бетаина гидрохлорида и пропиленгликоля в мольном соотношении 1 : 3 при 60 °С.</p></sec><sec><title>Заключение</title><p>Заключение. Извлекающая способность полученного DES по эффективности сопоставима и даже незначимо превышает таковую у классического экстрагента для исследуемой композиции – 70%-го этилового спирта. Дальнейшая разработка и оптимизация процесса использования DESs – многообещающее направление развития химии и фармацевтической технологии.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. Natural deep eutectic solvents (DESs) are promising extractants for many biologically active substances from plant raw materials. They are biodegradable, safe, stable, their production is affordable and easily feasible, and the extraction efficiency is comparable to known organic solvents. In this regard, interest in deep eutectic solvents has been steadily growing in recent years, and they are being used in various fields of chemistry, pharmaceuticals and the food industry.</p></sec><sec><title>Aim</title><p>Aim. The purpose of this work was to study the possibility of extracting flavonoids from plant raw materials using deep eutectic solvents, as well as to compare the efficiency of their extraction with traditional solvents.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. The extraction of flavonoids was carried out from the collection of a plant composition consisting of the herb of motherwort cordial (common motherwort) (Leonurus cardiaca L.), the herb of St. John's wort (Hypericum perforatum L.), the herb of lemon balm (Melissa officinalis L.) and the herb of creeping thyme (thyme) (Thymus serpyllum L.) in a ratio of 4 : 2.5 : 2.5 : 1, crushed to a particle size of 2–3 mm. 21 eutectic solvents based on betaine hydrochloride and choline bitartrate as hydrogen bond acceptors were used as extractants.</p></sec><sec><title>Results and discussion</title><p>Results and discussion. The extracting ability of 21 experimental compositions of DESs was studied. The influence of the water content in the composition of DES, as well as the effect of temperature on the extraction process, has been studied. Quantitative determination of flavonoids in terms of rutin was carried out by differential spectrophotometry at a wavelength of 410 ± 2 nm. The maximum yield of flavonoids was achieved using a 40 % aqueous solution of DES based on betaine hydrochloride and propylene glycol in a molar ratio of 1 : 3 at 60 °C.</p></sec><sec><title>Conclusion</title><p>Conclusion. The recovery ability of the obtained DES is comparable in efficiency and even slightly exceeds that of the classic extractant for the investigated composition – 70 % ethyl alcohol. Further development and optimization of the process of using DESs is a promising direction for the development of chemistry and pharmaceutical technology.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>глубокие эвтектические растворители (DESs)</kwd><kwd>флавоноиды</kwd><kwd>дифференциальная спектрофотометрия</kwd><kwd>пустырник</kwd><kwd>зверобой</kwd><kwd>мелисса</kwd><kwd>чабрец</kwd></kwd-group><kwd-group xml:lang="en"><kwd>natural deep eutectic solvents (DESs)</kwd><kwd>flavonoids</kwd><kwd>differential spectrophotometry</kwd><kwd>leonurus</kwd><kwd>hypericum</kwd><kwd>melissa</kwd><kwd>thyme</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">Turkmen N., Sari F., Velioglu Y. S. Effects of Extraction Solvents on Concentration and Antioxidant Activity of Black and Black Mate Tea Polyphenols Determined by Ferrous Tartrate and Folin-Ciocalteu Methods. Food Chem. 2006;99:835–841. DOI: 10.1016/j.foodchem.2005.08.034.</mixed-citation><mixed-citation xml:lang="en">Turkmen N., Sari F., Velioglu Y. S. Effects of Extraction Solvents on Concentration and Antioxidant Activity of Black and Black Mate Tea Polyphenols Determined by Ferrous Tartrate and Folin-Ciocalteu Methods. Food Chem. 2006;99:835–841. DOI: 10.1016/j.foodchem.2005.08.034.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Hayyan M., Hashim M. A., Hayyan A., Al-Saadi M. A., Alnashef I. M., Mirghani M. E. et al. Are deep eutectic solvents benign or toxic? Chemosphere. 2006;90(7):2193–2195. DOI: 10.1016/j.chemosphere.2012.11.004.</mixed-citation><mixed-citation xml:lang="en">Hayyan M., Hashim M. A., Hayyan A., Al-Saadi M. A., Alnashef I. M., Mirghani M. E. et al. Are deep eutectic solvents benign or toxic? Chemosphere. 2006;90(7):2193–2195. DOI: 10.1016/j.chemosphere.2012.11.004.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Paiva P., Craveiro R., Aroso I., Martins M., Reis R. L., Duarte A. R. C. Natural deep eutectic solvents solvents for the 21st century. ACS Sustain. Chem. Eng. 2014;2(5):1063–1071. DOI: 10.1021/sc500096j.</mixed-citation><mixed-citation xml:lang="en">Paiva P., Craveiro R., Aroso I., Martins M., Reis R. L., Duarte A. R. C. Natural deep eutectic solvents solvents for the 21st century. ACS Sustain. Chem. Eng. 2014;2(5):1063–1071. DOI: 10.1021/sc500096j.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Radošević K., Cvjetko Bubalo M., Gaurina Srcek V., Grgas D., Landeka Dragičević T., Radojčić Redovniković I. Evaluation of toxicity and biodegradability of choline chloride based deep eutectic solvents. Ecotoxicol. Environ. Saf. 2015;112:46–53. DOI: 10.1016/j.ecoenv.2014.09.034.</mixed-citation><mixed-citation xml:lang="en">Radošević K., Cvjetko Bubalo M., Gaurina Srcek V., Grgas D., Landeka Dragičević T., Radojčić Redovniković I. Evaluation of toxicity and biodegradability of choline chloride based deep eutectic solvents. Ecotoxicol. Environ. Saf. 2015;112:46–53. DOI: 10.1016/j.ecoenv.2014.09.034.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Wen Q., Chen J. X., Tang Y. L., Wang J., Yang Z. Assessing the toxicity and biodegradability of deep eutectic solvents. Chemosphere. 2015;132:63–69. DOI: 10.1016/j.chemosphere.2015.02.061.</mixed-citation><mixed-citation xml:lang="en">Wen Q., Chen J. X., Tang Y. L., Wang J., Yang Z. Assessing the toxi-city and biodegradability of deep eutectic solvents. Chemosphere. 2015;132:63–69. DOI: 10.1016/j.chemosphere.2015.02.061.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Dai Y., van Spronsen J., Witkamp G.-J., Verpoorte R., Choi Y. H. Natural deep eutectic solvents as new potential media for green technology. Anal. Chim. Acta. 2013;766:61–68. DOI: 10.1016/j.aca.2012.12.019.</mixed-citation><mixed-citation xml:lang="en">Dai Y., van Spronsen J., Witkamp G.-J., Verpoorte R., Choi Y. H. Natural deep eutectic solvents as new potential media for green technology. Anal. Chim. Acta. 2013;766:61–68. DOI: 10.1016/j.aca.2012.12.019.</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Andrew C., Etim E. E., Ushie O. A., Job J. N. Deep eutectic solvents: an overview of its application as a "green" extractant. IJARCS. 2017;4(6):23–30. DOI: 10.20431/2349-0403.0406003.</mixed-citation><mixed-citation xml:lang="en">Andrew C., Etim E. E., Ushie O. A., Job J. N. Deep eutectic solvents: an overview of its application as a "green" extractant. IJARCS. 2017;4(6):23–30. DOI: 10.20431/2349-0403.0406003.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Smith E. L., Abbott A. P., Ryder K. S. Deep eutectic solvents (DESs) and their applications. Chem. Rev. 2014;114(21):11060–11082. DOI: 10.1021/cr300162p.</mixed-citation><mixed-citation xml:lang="en">Smith E. L., Abbott A. P., Ryder K. S. Deep eutectic solvents (DESs) and their applications. Chem. Rev. 2014;114(21):11060–11082. DOI: 10.1021/cr300162p.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Zhao B.-Y., Xu P., Yang F.-X., Wu H., Zong M.-H., Lou W.-Y. Biocompatible deep eutectic solvents based on choline chloride: characterization and application to the extraction of rutin from Sophora japonica. ACS Sustain. Chem. Eng. 2015;3(11):2746–2755. DOI: 10.1021/acssuschemeng.5b00619.</mixed-citation><mixed-citation xml:lang="en">Zhao B.-Y., Xu P., Yang F.-X., Wu H., Zong M.-H., Lou W.-Y. Biocompatible deep eutectic solvents based on choline chloride: characterization and application to the extraction of rutin from Sophora japonica. ACS Sustain. Chem. Eng. 2015;3(11):2746–2755. DOI: 10.1021/acssuschemeng.5b00619.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Tang W., Li G., Chen B., Zhu T., Row K. H. Evaluating ternary deep eutectic solvents as novel media for extraction of flavonoids from Ginkgo biloba. Sep. Sci. Technol. 2016;52(1):91–99. DOI: 10.1080/01496395.2016.1247864.</mixed-citation><mixed-citation xml:lang="en">Tang W., Li G., Chen B., Zhu T., Row K. H. Evaluating ternary deep eutectic solvents as novel media for extraction of flavonoids from Ginkgo biloba. Sep. Sci. Technol. 2016;52(1):91–99. DOI: 10.1080/01496395.2016.1247864.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Obluchinskaya E. D., Daurtseva A. V., Pozharitskaya O. N., Flisyuk E. V., Shikov A. N. Natural deep eutectic solvents as alternatives for extracting phlorotannins from brown algae. Pharm. Chem. J. 2019;53(3):243–247. DOI: 10.1007/s11094-019-01987-0.</mixed-citation><mixed-citation xml:lang="en">Obluchinskaya E. D., Daurtseva A. V., Pozharitskaya O. N., Flisyuk E. V., Shikov A. N. Natural deep eutectic solvents as alternatives for extracting phlorotannins from brown algae. Pharm. Chem. J. 2019;53(3):243–247. DOI: 10.1007/s11094-019-01987-0.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Abbott A. P., Capper G., Davies D. L., Rasheed R. K., Tambyrajah V. Novel solvent properties of choline chloride/urea mixtures. Chem. Commun. 2003;70–71. DOI: 10.1039/b210714g.</mixed-citation><mixed-citation xml:lang="en">Abbott A. P., Capper G., Davies D. L., Rasheed R. K., Tambyrajah V. Novel solvent properties of choline chloride/urea mixtures. Chem. Commun. 2003;70–71. DOI: 10.1039/b210714g.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Mele A., Tran C. D., De Paoli Lacerda S. H. The structure of a room-temperature ionic liquid with and without trace amounts of water: the role of C–H...O and C–H...F interactions in 1-n-butyl-3-methylimidazolium tetrafluoroborate. Angew. Chem. Int. edit. 2003;115(36):4500–4502. DOI: 10.1002/ange.200351783.</mixed-citation><mixed-citation xml:lang="en">Mele A., Tran C. D., De Paoli Lacerda S. H. The structure of a room-temperature ionic liquid with and without trace amounts of water: the role of C–H...O and C–H...F interactions in 1-n-butyl-3-methylimidazolium tetrafluoroborate. Angew. Chem. Int. edit. 2003;115(36):4500–4502. DOI: 10.1002/ange.200351783.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Francisco M., van den Bruinhorst A., Kroon M. Low-Transition-Temperature Mixtures (LTTMs): a new generation of designer solvents. Angew. Chem. Int. edit. 2013;52(11):3074–3085. DOI: 10.1002/anie.201207548.</mixed-citation><mixed-citation xml:lang="en">Francisco M., van den Bruinhorst A., Kroon M. Low-Transition-Temperature Mixtures (LTTMs): a new generation of designer solvents. Angew. Chem. Int. edit. 2013;52(11):3074–3085. DOI: 10.1002/anie.201207548.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Токарева М. Г., Прожогина Ю. Е., Каленикова Е. И., Джавахян М. А. Фармакогностические и фармакологические аспекты создания новых седативных препаратов на основе лекарственного растительного сырья. Вопросы биологической, медицинской и фармацевтической химии. 2018;21(3):3−11. DOI: 10.29296/25877313-2018-03-01.</mixed-citation><mixed-citation xml:lang="en">Tokareva M. G., Prozhogina Y. E., Kalenikova E. I., Dzhavakhyan M. A. The pharmacognostic and pharmacological aspects of the creating of the new sedative drugs based on medicinal plant raw materials. Problems of biological, medical and pharmaceutical chemistry. 2018;21(3):3−11. (In Russ.) DOI: 10.29296/25877313-2018-03-01.</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Tursymatova O. I., Dilmakhanova M. M. Flavonoid physicochemical properties. Science and world. 2015;5(21):30–31.</mixed-citation><mixed-citation xml:lang="en">Tursymatova O. I., Dilmakhanova M. M. Flavonoid physicochemical properties. Science and world. 2015;5(21):30–31.</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Бабаджанян А. А., Кайшева Н. А., Умняхина И. В. Применение фотометрических методов в анализе растительных лекарственных средств. Беликовские чтения: материалы IV Всероссийской научно-практической конференции. 2015. 17–18 с.</mixed-citation><mixed-citation xml:lang="en">Babadzhanyan A. A., Kaisheva N. A., Umnyakhina I. V. Application of photometric methods in the analysis of plant medicines. Belikov readings: materials of the IV All-Russian scientific and practical conference. 2015. 17–18 p. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Shang X., Tan J.-N., Du Y., Liu X., Zhang Z. Environmentally-friendly extraction of flavonoids from Cyclocarya paliurus (Batal.) iljinskaja leaves with deep eutectic solvents and evaluation of their antioxidant activities. Molecules. 2018;23(9):2110. DOI: 10.3390/molecules23092110.</mixed-citation><mixed-citation xml:lang="en">Shang X., Tan J.-N., Du Y., Liu X., Zhang Z. Environmentally-friendly extraction of flavonoids from Cyclocarya paliurus (Batal.) iljinskaja leaves with deep eutectic solvents and evaluation of their antioxidant activities. Molecules. 2018;23(9):2110. DOI: 10.3390/molecules23092110.</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Dai Y., Row K. H. Application of natural deep eutectic solvents in the extraction of quercetin from vegetables. Molecules. 2019;24(12):2300. DOI: 10.3390/molecules24122300.</mixed-citation><mixed-citation xml:lang="en">Dai Y., Row K. H. Application of natural deep eutectic solvents in the extraction of quercetin from vegetables. Molecules. 2019;24(12):2300. DOI: 10.3390/molecules24122300.</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Bajkacz S., Adamek J. Development of a method based on natural deep eutectic solvents for extraction of flavonoids from food samples. Food Anal. Methods. 2017;11:1330–1344. DOI: 10.1007/s12161-017-1118-5.</mixed-citation><mixed-citation xml:lang="en">Bajkacz S., Adamek J. Development of a method based on natural deep eutectic solvents for extraction of flavonoids from food samples. Food Anal. Methods. 2017;11:1330–1344. DOI: 10.1007/s12161-017-1118-5.</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Peng F., Zhao Y., Li F.-Z., Zong M.-H., Lou W.-Y. The effect of deep eutectic solvents on the asymmetric hydrolysis of styrene oxide by mung bean epoxide hydrolases. Bioresources and Bioprocessing. 2018;5:5. DOI: 10.1186/s40643-018-0191-y.</mixed-citation><mixed-citation xml:lang="en">Peng F., Zhao Y., Li F.-Z., Zong M.-H., Lou W.-Y. The effect of deep eutectic solvents on the asymmetric hydrolysis of styrene oxide by mung bean epoxide hydrolases. Bioresources and Bioprocessing. 2018;5:5. DOI: 10.1186/s40643-018-0191-y.</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Huang Y., Feng F., Jiang J., Qiao Y., Wu T., Voglmeir J., Chen Z.-G. Green and efficient extraction of rutin from tartary buckwheat hull by using natural deep eutectic solvents. Food Chem. 2017;221:1400–1405. DOI: 10.1016/j.foodchem.2016.11.013.</mixed-citation><mixed-citation xml:lang="en">Huang Y., Feng F., Jiang J., Qiao Y., Wu T., Voglmeir J., Chen Z.-G. Green and efficient extraction of rutin from tartary buckwheat hull by using natural deep eutectic solvents. Food Chem. 2017;221:1400–1405. DOI: 10.1016/j.foodchem.2016.11.013.</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">Mulia K., Muhammad F., Krisanti E. Extraction of vitexin from binahong (Anredera cordifolia (Ten.) Steenis) leaves using betaine - 1,4 butanediol natural deep eutectic solvent (NADES). AIP Conf. Proc. 2017;1823. DOI: 10.1063/1.4978091.</mixed-citation><mixed-citation xml:lang="en">Mulia K., Muhammad F., Krisanti E. Extraction of vitexin from binahong (Anredera cordifolia (Ten.) Steenis) leaves using betaine - 1,4 butanediol natural deep eutectic solvent (NADES). AIP Conf. Proc. 2017;1823. DOI: 10.1063/1.4978091.</mixed-citation></citation-alternatives></ref><ref id="cit24"><label>24</label><citation-alternatives><mixed-citation xml:lang="ru">Bi W., Tian M., Row K. H. Evaluation of alcohol-based deep eutectic solvent in extraction and determination of flavonoids with response surface methodology optimization. J. Chromatogr. A. 2013;1285:22–30. DOI: 10.1016/j.chroma.2013.02.041.</mixed-citation><mixed-citation xml:lang="en">Bi W., Tian M., Row K. H. Evaluation of alcohol-based deep eutectic solvent in extraction and determination of flavonoids with response surface methodology optimization. J. Chromatogr. A. 2013;1285:22–30. DOI: 10.1016/j.chroma.2013.02.041.</mixed-citation></citation-alternatives></ref><ref id="cit25"><label>25</label><citation-alternatives><mixed-citation xml:lang="ru">Abbott A. P., Al-Murshedi A. Y. M., Alshammari O. A. O. Thermodynamics of phase transfer for polar molecules from alkanes to deep eutectic solvents. Fluid Phase Equilibr. 2017;448:99–104. DOI: 10.1016/j.fluid.2017.05.008.</mixed-citation><mixed-citation xml:lang="en">Abbott A. P., Al-Murshedi A. Y. M., Alshammari O. A. O. Thermodynamics of phase transfer for polar molecules from alkanes to deep eutectic solvents. Fluid Phase Equilibr. 2017;448:99–104. DOI: 10.1016/j.fluid.2017.05.008.</mixed-citation></citation-alternatives></ref><ref id="cit26"><label>26</label><citation-alternatives><mixed-citation xml:lang="ru">Świergiel J., Bouteiller L., Jadżyn J. Compliance of the Stokes–Einstein model and breakdown of the Stokes–Einstein–Debye model for a urea-based supramolecular polymer of high viscosity. Soft. Matter. 2014;10:8457–8463. DOI: 10.1039/c4sm01556h.</mixed-citation><mixed-citation xml:lang="en">Świergiel J., Bouteiller L., Jadżyn J. Compliance of the Stokes–Einstein model and breakdown of the Stokes–Einstein–Debye model for a urea-based supramolecular polymer of high viscosity. Soft. Matter. 2014;10:8457–8463. DOI: 10.1039/c4sm01556h.</mixed-citation></citation-alternatives></ref><ref id="cit27"><label>27</label><citation-alternatives><mixed-citation xml:lang="ru">Dietrych-Szostak D., Oleszek W. Effect of processing on the flavonoid content in buckwheat (Fagopyrum esculentum Möench) grain. J. Agric. Food Chem. 1999:47(10):4384–4387. DOI: 10.1021/jf990121m.</mixed-citation><mixed-citation xml:lang="en">Dietrych-Szostak D., Oleszek W. Effect of processing on the flavonoid content in buckwheat (Fagopyrum esculentum Möench) grain. J. Agric. Food Chem. 1999:47(10):4384–4387. DOI: 10.1021/jf990121m.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
