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Inside amber: New insights into the macromolecular structure of Class Ib resinite.

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Title: Inside amber: New insights into the macromolecular structure of Class Ib resinite.
Authors: Poulin, Jennifer1 jennifer.poulin@pch.gc.ca, Helwig, Kate1 kate.helwig@pch.gc.ca
Source: Organic Geochemistry. Sep2015, Vol. 86, p94-106. 13p.
Subjects: Amber, Molecular structure, Resinite, Copolymerization, Succinic acid
Abstract: Class Ib resinites are the most common subclass of amber and are found throughout the world. They have a macromolecular structure based on co-polymerized communic acid, communol and biformenes. Because this class of resinite does not contain succinic acid, crosslinking of the polymer through esterification of communol moieties has never been theorized. Analysis of Class Ib resinites from Grassy Lake and Cedar Lake in western Canada was performed using pyrolysis–gas chromatography–mass spectrometry with in situ hexamethyldisilazane derivatization, using a thermal separation probe to perform the pyrolysis and sample introduction. This has allowed larger, more complex fragments to be released from the polymer matrix than previously possible using instantaneous pyrolysis methodologies. The results show for the first time that Class Ib resinite can undergo self-crosslinking between the communol and communic acid moieties in the polylabdane matrix. The chromatographic results also show that a portion of the monoterpenes and non-polymerizable diterpenes in the resinite are bound to the polymer matrix and not fully occluded as was previously theorized. Fourier transform infrared (FTIR) spectra of the resinites are presented and a more accurate spectral interpretation is proposed, based on the chromatographic results. [ABSTRACT FROM AUTHOR]
Copyright of Organic Geochemistry is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 108551962
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Inside amber: New insights into the macromolecular structure of Class Ib resinite.
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  Data: <searchLink fieldCode="AR" term="%22Poulin%2C+Jennifer%22">Poulin, Jennifer</searchLink><relatesTo>1</relatesTo><i> jennifer.poulin@pch.gc.ca</i><br /><searchLink fieldCode="AR" term="%22Helwig%2C+Kate%22">Helwig, Kate</searchLink><relatesTo>1</relatesTo><i> kate.helwig@pch.gc.ca</i>
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  Data: <searchLink fieldCode="JN" term="%22Organic+Geochemistry%22">Organic Geochemistry</searchLink>. Sep2015, Vol. 86, p94-106. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Amber%22">Amber</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+structure%22">Molecular structure</searchLink><br /><searchLink fieldCode="DE" term="%22Resinite%22">Resinite</searchLink><br /><searchLink fieldCode="DE" term="%22Copolymerization%22">Copolymerization</searchLink><br /><searchLink fieldCode="DE" term="%22Succinic+acid%22">Succinic acid</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Class Ib resinites are the most common subclass of amber and are found throughout the world. They have a macromolecular structure based on co-polymerized communic acid, communol and biformenes. Because this class of resinite does not contain succinic acid, crosslinking of the polymer through esterification of communol moieties has never been theorized. Analysis of Class Ib resinites from Grassy Lake and Cedar Lake in western Canada was performed using pyrolysis–gas chromatography–mass spectrometry with in situ hexamethyldisilazane derivatization, using a thermal separation probe to perform the pyrolysis and sample introduction. This has allowed larger, more complex fragments to be released from the polymer matrix than previously possible using instantaneous pyrolysis methodologies. The results show for the first time that Class Ib resinite can undergo self-crosslinking between the communol and communic acid moieties in the polylabdane matrix. The chromatographic results also show that a portion of the monoterpenes and non-polymerizable diterpenes in the resinite are bound to the polymer matrix and not fully occluded as was previously theorized. Fourier transform infrared (FTIR) spectra of the resinites are presented and a more accurate spectral interpretation is proposed, based on the chromatographic results. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Organic Geochemistry is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.orggeochem.2015.05.009
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      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 13
        StartPage: 94
    Subjects:
      – SubjectFull: Amber
        Type: general
      – SubjectFull: Molecular structure
        Type: general
      – SubjectFull: Resinite
        Type: general
      – SubjectFull: Copolymerization
        Type: general
      – SubjectFull: Succinic acid
        Type: general
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      – TitleFull: Inside amber: New insights into the macromolecular structure of Class Ib resinite.
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            – D: 01
              M: 09
              Text: Sep2015
              Type: published
              Y: 2015
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              Value: 86
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            – TitleFull: Organic Geochemistry
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