treatments-xml/data/03/A0/62/03A0625A5E2F9E25FC8CAE4A248290E5.xml
2024-06-21 12:22:17 +02:00

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<mods:title id="794F100C30E26B443ABD201074E8F3E4">Establishing the metabolic network of isoquinoline alkaloids from the Macleaya genus</mods:title>
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2.3. Screening and identifying [ring-
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]-labeled alkaloids from
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M.
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<emphasis id="B97D0F5E5E2F9E25FC8CAE7624C597E8" bold="true" box="[818,969,622,642]" italics="true" pageId="2" pageNumber="3">cordata seedlings</emphasis>
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The [
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-
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]-labeled isoquinoline alkaloids were screened from the TICs of
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<emphasis id="B97D0F5E5E2F9E25FC20AED9230C97BF" bold="true" box="[926,1024,705,725]" italics="true" pageId="2" pageNumber="3">M. cordata</emphasis>
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seedlings by EIC of the theoretical [
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+6.0201]
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values (
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represents the
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values of identified alkaloids). These labeled alkaloids were further identified by comparing their retention times,
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or
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/
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data with those of their unlabeled alkaloids. Take compound
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as an example. An obvious peak was formed via EIC of
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320.1952 ([314.1751 + 6.0201]
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) on the TICs of
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<emphasis id="B97D0F5E5E2F9E25FAB1AF55227F960B" bold="true" box="[1295,1395,845,865]" italics="true" pageId="2" pageNumber="3">M. cordata</emphasis>
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seedlings that were fed [
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-
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]-tyrosine. In the
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spectrum of alkaloid
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(Fig.
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5
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), unlabeled (
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314.1747) and labeled (
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320.1952) mass-tocharge ratio values were observed. In the
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/
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spectrum of unlabeled
<emphasis id="B97D0F5E5E2F9E25FCD5AFA5248396BB" bold="true" box="[875,911,957,977]" italics="true" pageId="2" pageNumber="3">m/z</emphasis>
314.1747 (Fig.
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5 B), the base peak ion at
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107.0483 was formed by β- cleavage of the skeleton. However, the corresponding fragment ion was found at
<emphasis id="B97D0F5E5E2F9E25FB83AFEC236E9162" bold="true" box="[1085,1122,1012,1032]" italics="true" pageId="2" pageNumber="3">m/z</emphasis>
<quantity id="4CF17EA95E2F9E25FBD4AFED23D39162" box="[1130,1247,1013,1032]" metricMagnitude="0" metricUnit="m" metricValue="2.87180782" pageId="2" pageNumber="3" unit="in" value="113.0633">113.0633 in</quantity>
the
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/
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spectrum of labeled
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320.1952, which indicated that the C-ring in the structure of alkaloid
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was labeled (Fig.
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5
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). In addition, the unlabeled (
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175.0605) and labeled (
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275.1370) fragment ions were also generated from the
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/
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spectrum of labeled parent ion, which further identified alkaloid
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as demethylcolletine (Table
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2). When we used a similar method, a total of 120 [
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-
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]-labeled isoquinoline alkaloids were screened and identified from the TICs of
<taxonomicName id="4C09A8CF5E2F9E25FAB7A8A0226391A6" box="[1289,1391,1208,1228]" class="Magnoliopsida" family="Papaveraceae" genus="Macleaya" kingdom="Plantae" order="Ranunculales" pageId="2" pageNumber="3" phylum="Tracheophyta" rank="species" species="cordata">
<emphasis id="B97D0F5E5E2F9E25FAB7A8A0226391A6" bold="true" box="[1289,1391,1208,1228]" italics="true" pageId="2" pageNumber="3">M. cordata</emphasis>
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seedlings (Table
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2). However, some of the identified isoquinoline alkaloids, such as compounds
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and
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, were not found to be labeled by [
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-
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]. One reason is that the content of [
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]-isoquinoline alkaloids was low and hard to detect by HPLC-Q-TOF-MS. Another reason is that some unlabeled isoquinoline alkaloids, such as compounds
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and
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, were found from only
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<emphasis id="B97D0F5E5E2F9E25FC5FA94723659019" bold="true" box="[993,1129,1375,1395]" italics="true" pageId="2" pageNumber="3">M. microcarpa</emphasis>
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seedlings and not from
<taxonomicName id="4C09A8CF5E2F9E25FAD6A94722C39019" box="[1384,1487,1375,1395]" class="Magnoliopsida" family="Papaveraceae" genus="Macleaya" kingdom="Plantae" order="Ranunculales" pageId="2" pageNumber="3" phylum="Tracheophyta" rank="species" species="cordata">
<emphasis id="B97D0F5E5E2F9E25FAD6A94722C39019" bold="true" box="[1384,1487,1375,1395]" italics="true" pageId="2" pageNumber="3">M. cordata</emphasis>
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seedlings.
</paragraph>
</subSubSection>
</treatment>
</document>