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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="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">zldm</journal-id><journal-title-group><journal-title xml:lang="ru">Заводская лаборатория. Диагностика материалов</journal-title><trans-title-group xml:lang="en"><trans-title>Industrial laboratory. Diagnostics of materials</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1028-6861</issn><issn pub-type="epub">2588-0187</issn><publisher><publisher-name>ООО «Издательство «ТЕСТ-ЗЛ»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26896/1028-6861-2020-86-3-20-24</article-id><article-id custom-type="elpub" pub-id-type="custom">zldm-1171</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>АНАЛИЗ ВЕЩЕСТВА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SUBSTANCES ANALYSIS</subject></subj-group></article-categories><title-group><article-title>Применение тетрацианоэтилена в качестве фотометрического реагента в анализе фармацевтических препаратов</article-title><trans-title-group xml:lang="en"><trans-title>The use of tetracyanoethylene as a photometric reagent in analysis of pharmaceutical preparations</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Турусова</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Turusova</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Елена Васильевна Турусова</p><p>428015, Чебоксары, Московский пр-т, 15</p></bio><bio xml:lang="en"><p>Elena V. Turusova</p><p>15, Moskovsky prosp., Cheboksary, 428015</p></bio><email xlink:type="simple">elvastur@ya.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Насакин</surname><given-names>О. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Nasakin</surname><given-names>O. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Олег Евгеньевич Насакин</p><p>428015, Чебоксары, Московский пр-т, 15</p></bio><bio xml:lang="en"><p>Oleg E. Nasakin</p><p>15, Moskovsky prosp., Cheboksary, 428015</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Чувашский государственный университет им. И.Н. Ульянова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>I.N. Ulyanov Chuvash State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>24</day><month>03</month><year>2020</year></pub-date><volume>86</volume><issue>3</issue><fpage>20</fpage><lpage>24</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Турусова Е.В., Насакин О.Е., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Турусова Е.В., Насакин О.Е.</copyright-holder><copyright-holder xml:lang="en">Turusova E.V., Nasakin O.E.</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.zldm.ru/jour/article/view/1171">https://www.zldm.ru/jour/article/view/1171</self-uri><abstract><p>Рассмотрена возможность применения тетрацианоэтилена (ТЦЭ) в качестве фотометрического реагента для определения анальгина в лекарственных препаратах. Фотометрируемую форму получали в водной фазе в ацетатной буферной среде (pH 3,13). Образующийся π-комплекс имеет два максимума поглощения на длинах волн 400 и 420 нм с молярными коэффициентами поглощения 1,56 · 104 и 1,62 · 104 соответственно. В связи с высокой лабильностью фотометрического реагента оптическую плотность комплекса необходимо измерять сразу же после его получения. Методами молярных отношений и изомолярных серий установили состав π-комплекса (1:1). Рассчитанное значение его константы устойчивости составило 1,42 · 106. На основании проведенных исследований разработана спектрофотометрическая (СФ) методика определения анальгина в лекарственных препаратах с пределом определения 42,63 мкг/мл (погрешность не превышает 3,0 % отн.) в диапазоне содержаний аналита 20 – 100 мкг/мл. Апробацию СФ методики определения анальгина проводили при анализе таблеток и раствора для инъекций отечественного производства: наблюдается хорошая сходимость результатов определения действующего вещества по разработанной и арбитражной (ФС.2.1.0003.15) методикам. Найденное содержание анальгина в лекарственной форме соответствует заявленному. Разработанная методика характеризуется простотой выполнения, доступностью аппаратурного оформления и может быть рекомендована для определения анальгина в условиях обычной контрольно-аналитической лаборатории.</p></abstract><trans-abstract xml:lang="en"><p>A possibility of using tetracyanoethylene (TCNE) as a photometric reagent for determination of the dipyrone content in pharmaceuticals is considered. A photometric form was obtained in the aqueous phase in an acetate buffer medium (pH 3.13). The resulting π-complex revealed two absorption bands at (400 and 420) nm with molar absorption coefficients of 1.56 Ч 104 and 1.62 Ч 104, respectively. Due to a high lability of the photometric reagent, the optical density of the complex thus formed must be measured immediately after preparation. The composition and possible mechanism of π-complex formation were determined using the methods of molar ratios and isomolar series: the active substance interacts with the reagent in a molar ratio 1:1. The calculated value of the stability constant of the formed π-complex was 1.42 Ч 106. Proceeding from the obtained data, a spectrophotometric method of dipyrone determination in drugs is developed with a detection limit of 42.63 μg/ml (the error of determination being below 3.0%). The linear dependence of the analytical signal on the concentration of the active substance is observed in the range of 20 – 100 μg/ml. Testing of the spectrophotometric method for dipyrone determination was carried out on tablets and injection solutions manufactured in Russia. There is a good convergence between the results of dipyrone determination by the developed and arbitration methods (pharmacopoeia monograph 2.1.0003.15). The analysis revealed that the content of dipyrone in the dosage form corresponds to the declared. The developed technique is easy to use accessible in equipment and can be recommended for determination of dipyrone in conditions of a conventional analytical laboratory.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>тетрацианоэтилен</kwd><kwd>анальгин</kwd><kwd>определение</kwd><kwd>спектрофотометрия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>tetracyanoethylene</kwd><kwd>dipyrone</kwd><kwd>determination</kwd><kwd>spectrophotometry</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">Crisan M., Halip L., Bourosh P., et al. 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