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<article xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.3" xml:lang="uz">
  <front>
    <journal-meta>
      <journal-id journal-id-type="publisher-id">research-focus</journal-id>
      <journal-title-group>
        <journal-title>Research Focus International Scientific Journal</journal-title>
        <abbrev-journal-title abbrev-type="publisher">Research Focus</abbrev-journal-title>
      </journal-title-group>
      <issn pub-type="epub" publication-format="electronic">2181-3833</issn>
      <publisher>
        <publisher-name>Ilm-fan va innovatsiyalar akademiyasi</publisher-name>
      </publisher>
    </journal-meta>
    <article-meta>
      <article-id pub-id-type="doi">10.66073/researchfocus.v4i5.1608</article-id>
      <article-id pub-id-type="other" assigning-authority="relibrary.uz">REL-A-012936</article-id>
      <article-categories>
        <subj-group subj-group-type="oak">
          <subject>02.00.00</subject>
        </subj-group>
      </article-categories>
      <title-group>
        <article-title xml:lang="uz">PHLOMOIDES NUDA O‘SIMLIGI TARKIBIDAN AJRATIB OLINGAN AYRIM MODDALARNING TARKIBI VA TUZILISHINI KVANT-KIMYOVIY HISOBLASH METODI YORDAMIDA TAQQOSLASH</article-title>
        <trans-title-group xml:lang="en">
          <trans-title>COMPARISON OF THE COMPOSITION AND STRUCTURE OF CERTAIN SUBSTANCES ISOLATED FROM THE PLANT PHLOMOIDES NUDA USING THE QUANTUM-CHEMICAL CALCULATION METHOD</trans-title>
        </trans-title-group>
        <trans-title-group xml:lang="ru">
          <trans-title>СРАВНЕНИЕ СОСТАВА И СТРУКТУРЫ НЕКОТОРЫХ ВЕЩЕСТВ, ВЫДЕЛЕННЫХ ИЗ РАСТЕНИЯ PHLOMOIDES NUDA, С ИСПОЛЬЗОВАНИЕМ МЕТОДОВ КВАНТОВО-ХИМИЧЕСКОГО РАСЧЕТА</trans-title>
        </trans-title-group>
      </title-group>
      <contrib-group content-type="author">
        <contrib contrib-type="author">
          <string-name>M.M.Mexmonxonov, F.Q. Abdullayeva, D.R.Xaydarova</string-name>
          <aff>Namangan davlat universiteti</aff>
        </contrib>
      </contrib-group>
      <pub-date publication-format="electronic" date-type="pub" iso-8601-date="2025-06-05">
        <day>05</day>
        <month>06</month>
        <year>2025</year>
      </pub-date>
      <pub-date date-type="collection">
        <year>2025</year>
      </pub-date>
      <volume>4</volume>
      <issue>5</issue>
      <fpage>29</fpage>
      <lpage>35</lpage>
      <permissions>
        <license xlink:href="https://creativecommons.org/licenses/by/4.0">
          <ali:license_ref>https://creativecommons.org/licenses/by/4.0</ali:license_ref>
          <license-p>Ushbu asar Creative Commons Attribution 4.0 International litsenziyasi asosida litsenziyalangan.</license-p>
        </license>
      </permissions>
      <self-uri xlink:href="https://relibrary.uz/REL-A-012936/"/>
      <abstract xml:lang="uz">
        <p>Ushbu ilmiy maqolada Namangan viloyati Yangiqo‘rg‘on tumanida o‘suvchi Phlomoides nuda o‘simligi tarkibidan ajratib olingan biologik faol birikmalar — ekdisteron, α-ekdizon, 8-O-asetilgarpagid, lamiid va pinitol molekulalarining strukturasi DFT/B3LYP/3-21G usuli asosida kvant-kimyoviy hisoblash dasturi Gaussian 98 orqali optimallashtirildi. Ularning infraqizil tebranish (IQ) spektrlari eksperimental va nazariy jihatdan qiyoslab tahlil qilindi. Natijalar shuni ko‘rsatdiki, molekulalarning eksperimental spektrlari nazariy spektral cho‘qqilar bilan yuqori darajada mos keladi. Ayniqsa, deformasion va valent tebranishlarga oid tebranish modlari aniqligi molekulalardagi halqalar soni, C-O, C-H, C- C bog‘larining mavjudligini va tuzilmaning aniqligini tasdiqlaydi. Bu tahlil natijalari ajratilgan moddalarning kimyoviy strukturasi yuqorida keltirilgan formulalar asosida tasdiqlanishiga asos bo‘ldi.</p>
      </abstract>
      <trans-abstract xml:lang="en">
        <p>In this scientific article the structures of the biologically active compounds isolated from the plant Phlomoides nuda growing in the Yangiqo‘rg‘on district of Namangan region, namely the molecules of ecdysterone, α-ecdysone, 8-O-acetylharpagide, lamiide and pinitol, were optimised by means of the quantum-chemical calculation program Gaussian 98 on the basis of the DFT/B3LYP/3-21G method. Their infrared (IR) vibrational spectra were compared and analysed both experimentally and theoretically. The results showed that the experimental spectra of the molecules correspond to a high degree with the theoretical spectral peaks. In particular, the accuracy of the vibrational modes relating to deformation and valence vibrations confirms the number of rings in the molecules, the presence of C-O, C-H, C-C bonds and the exactness of the structure. The results of this analysis provided the grounds for confirming the chemical structure of the isolated substances on the basis of the formulas presented above.</p>
      </trans-abstract>
      <trans-abstract xml:lang="ru">
        <p>В данной научной статье рассмотрены результаты квантово-химического и спектроскопического анализа молекул экдистерона, α-экдизона, 8-O- ацетилгарпагида, ламида и пинитола, выделенных из растения Phlomoides nuda, произрастающего в Янгикурганском районе Наманганской области. Структуры молекул были оптимизированы с использованием метода DFT/B3LYP и базиса 3 -21G в программном пакете Gaussian 98. Экспериментально полученные ИК-спектры сравнивались с теоретически рассчитанными данными. Результаты анализа показали высокую степень совпадения спектральных пиков, что подтверждает достоверность определенным молекулярных структур. Особое внимание уделено валентным и деформационным колебаниям, связанным с наличием водородных связей, групп –OH, C– C, C–O, а также количеству и типу циклов в молекулах. Полученные результаты свидетельствуют об идентичности исследуемых соединений с представленными молекулярными формулами.</p>
      </trans-abstract>
      <kwd-group xml:lang="uz">
        <kwd>Phlomoides nuda</kwd>
        <kwd>ekdisteron</kwd>
        <kwd>α-ekdizon</kwd>
        <kwd>8-O-asetilgarpagid</kwd>
        <kwd>lamiid</kwd>
        <kwd>pinitol</kwd>
        <kwd>DFT</kwd>
        <kwd>Gaussian 98</kwd>
        <kwd>infraqizil spektroskopiya</kwd>
        <kwd>molekulyar strukturasi</kwd>
        <kwd>vodorod bog‘lanish</kwd>
        <kwd>tebranish modlari</kwd>
      </kwd-group>
      <kwd-group xml:lang="en">
        <kwd>Phlomoides nuda</kwd>
        <kwd>ecdysterone</kwd>
        <kwd>α-ecdysone</kwd>
        <kwd>8-O-acetylharpagide</kwd>
        <kwd>lamiide</kwd>
        <kwd>pinitol</kwd>
        <kwd>DFT</kwd>
        <kwd>Gaussian 98</kwd>
        <kwd>infrared spectroscopy</kwd>
        <kwd>molecular structure</kwd>
        <kwd>hydrogen bonding</kwd>
        <kwd>vibrational modes</kwd>
      </kwd-group>
      <kwd-group xml:lang="ru">
        <kwd>Phlomoides nuda</kwd>
        <kwd>экдистерон</kwd>
        <kwd>α-экдизон</kwd>
        <kwd>8-O-ацетилгарпагид</kwd>
        <kwd>ламиид</kwd>
        <kwd>пинитол</kwd>
        <kwd>DFT</kwd>
        <kwd>Gaussian 98</kwd>
        <kwd>инфракрасная спектроскопия</kwd>
        <kwd>молекулярная структура</kwd>
        <kwd>водородная связь</kwd>
        <kwd>колебательные моды</kwd>
      </kwd-group>
    </article-meta>
  </front>
  <back>
    <ref-list>
      <ref id="r1">
        <label>1</label>
        <mixed-citation>Moench, H. (2023). Phlomoides Systematics and Phytochemistry. Journal of Medicinal Plants Research, 15(2), 115-130.</mixed-citation>
      </ref>
      <ref id="r2">
        <label>2</label>
        <mixed-citation>Gaussian 98 User’s Reference. Gaussian, Inc., Pittsburgh, 2001.</mixed-citation>
      </ref>
      <ref id="r3">
        <label>3</label>
        <mixed-citation>Ikromov, S., &amp; Xudoyberganov, A. (2020). O‘zbekiston florasi. Toshkent: Fan.</mixed-citation>
      </ref>
      <ref id="r4">
        <label>4</label>
        <mixed-citation>Tursunov, M., &amp; Valiev, A. (2019). Biological Activity of Plant-Derived Ecdysteroids. Uzbekistan Journal of Natural Sciences, 8(3), 50-56.</mixed-citation>
      </ref>
      <ref id="r5">
        <label>5</label>
        <mixed-citation>Zhang, L., et al. (2018). Phytochemical Analysis of Ecdysteroids from Plant Extracts. Phytochemistry, 145, 23-34.</mixed-citation>
      </ref>
      <ref id="r6">
        <label>6</label>
        <mixed-citation>Chen, Y., Wang, Z., &amp; Li, H. (2017). Molecular Docking of Plant Ecdysteroids and Their Effects on Human Cells. Molecular Biology Reports, 44(5), 333-340.</mixed-citation>
      </ref>
      <ref id="r7">
        <label>7</label>
        <mixed-citation>Akhmedov, M. (2015). Infrared Spectroscopy in Plant Chemistry Studies. Tashkent: Science and Technology Publishing.</mixed-citation>
      </ref>
      <ref id="r8">
        <label>8</label>
        <mixed-citation>Kurbanov, A., &amp; Mahmudov, H. (2014). Application of Quantum Chemistry in Plant Secondary Metabolites Analysis. Chemica Scripta, 7(1), 23-29.</mixed-citation>
      </ref>
    </ref-list>
  </back>
</article>
