<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>UTas ePrints - Effects of capsaicinoids and curcumin on copper-induced oxidation of human serum</title> <script type="text/javascript" src="http://eprints.utas.edu.au/javascript/auto.js"><!-- padder --></script> <style type="text/css" media="screen">@import url(http://eprints.utas.edu.au/style/auto.css);</style> <style type="text/css" media="print">@import url(http://eprints.utas.edu.au/style/print.css);</style> <link rel="icon" href="/images/eprints/favicon.ico" type="image/x-icon" /> <link rel="shortcut icon" href="/images/eprints/favicon.ico" type="image/x-icon" /> <link rel="Top" href="http://eprints.utas.edu.au/" /> <link rel="Search" href="http://eprints.utas.edu.au/cgi/search" /> <meta content="Ahuja, K.D." name="eprints.creators_name" /> <meta content="Kunde, D.A." name="eprints.creators_name" /> <meta content="Ball, M.J." name="eprints.creators_name" /> <meta content="Geraghty, D.P." name="eprints.creators_name" /> <meta content="conference_item" name="eprints.type" /> <meta content="2007-07-19" name="eprints.datestamp" /> <meta content="2008-01-08 15:30:00" name="eprints.lastmod" /> <meta content="show" name="eprints.metadata_visibility" /> <meta content="Effects of capsaicinoids and curcumin on copper-induced oxidation of human serum " name="eprints.title" /> <meta content="pub" name="eprints.ispublished" /> <meta content="321200" name="eprints.subjects" /> <meta content="320000" name="eprints.subjects" /> <meta content="public" name="eprints.full_text_status" /> <meta content="poster" name="eprints.pres_type" /> <meta content="Introduction: Oxidation of low density lipoprotein (LDL) cholesterol is believed to be the first step in the development and progression of atherosclerosis. The active ingredients of spices such as chilli and turmeric (capsaicin and curcumin, respectively) have been shown to reduce the susceptibility of LDL to oxidation. One of the techniques used to study the oxidation of LDL is to isolate and subject LDL to metal-induced (copper or iron) oxidation. However, whole serum may represent a closer situation to in vivo than isolated LDL. Methods: We investigated the effects of different concentrations of capsaicin, dihydrocapsaicin and curcumin on copper-induced oxidation of serum. Serum samples, collected from six fasting healthy individuals (3 men and 3 women, mean age 34 +/- 10 years) was diluted 50-fold in phosphate-buffered saline (pH 7.4), incubated with increasing concentrations (0.1, 0.5, 0.7, 1, 2 and 3uM) of capsaicin, dihydrocapsaicin and curcumin, and subjected to copper (100uM) induced oxidation. Oxidation kinetics were determined for each serum sample in duplicate by measuring absorbance at 245nm at 37 degree Celsius using a multi-position spectroscope (Cintra 10E UV-VIS , GBC scientific equipments, Victoria, Australia) every 10 min for 300 min. Lag time (before initiation of oxidation) and rate of oxidation (slope of propagation phase) were calculated from the oxidation curves. Results: Lag time increased and rate of oxidation decreased (p<0.05) with the increasing concentrations of the antioxidants. A 50% increase in lag time (from control) was observed at concentrations between 0.5 to 0.7uMfor capsaicin, dihydrocapsaicin and curcumin. Although the rate of oxidation decreased with increasing concentrations of the tested antioxidants, the total oxidation was lower with capsaicin and dihydrocapsaicin compared to curcumin. Conclusion: This study shows that oxidation of serum lipids is reduced by capsaicinoids and curcumin in a concentration-dependent manner." name="eprints.abstract" /> <meta content="2006" name="eprints.date" /> <meta content="published" name="eprints.date_type" /> <meta content="AIMS AACB Scientific Conference 2006" name="eprints.event_title" /> <meta content="Hobart, Australia" name="eprints.event_location" /> <meta content="23 - 27 Oct 2006" name="eprints.event_dates" /> <meta content="conference" name="eprints.event_type" /> <meta content="UNSPECIFIED" name="eprints.thesis_type" /> <meta content="TRUE" name="eprints.refereed" /> <meta content="Ahuja, K.D. and Kunde, D.A. and Ball, M.J. and Geraghty, D.P. (2006) Effects of capsaicinoids and curcumin on copper-induced oxidation of human serum. In: AIMS AACB Scientific Conference 2006, 23 - 27 Oct 2006, Hobart, Australia." name="eprints.citation" /> <meta content="http://eprints.utas.edu.au/1411/1/AACB.pdf" name="eprints.document_url" /> <link rel="schema.DC" href="http://purl.org/DC/elements/1.0/" /> <meta content="Effects of capsaicinoids and curcumin on copper-induced oxidation of human serum " name="DC.title" /> <meta content="Ahuja, K.D." name="DC.creator" /> <meta content="Kunde, D.A." name="DC.creator" /> <meta content="Ball, M.J." name="DC.creator" /> <meta content="Geraghty, D.P." name="DC.creator" /> <meta content="321200 Public Health and Health Services" name="DC.subject" /> <meta content="320000 Medical and Health Sciences" name="DC.subject" /> <meta content="Introduction: Oxidation of low density lipoprotein (LDL) cholesterol is believed to be the first step in the development and progression of atherosclerosis. The active ingredients of spices such as chilli and turmeric (capsaicin and curcumin, respectively) have been shown to reduce the susceptibility of LDL to oxidation. One of the techniques used to study the oxidation of LDL is to isolate and subject LDL to metal-induced (copper or iron) oxidation. However, whole serum may represent a closer situation to in vivo than isolated LDL. Methods: We investigated the effects of different concentrations of capsaicin, dihydrocapsaicin and curcumin on copper-induced oxidation of serum. Serum samples, collected from six fasting healthy individuals (3 men and 3 women, mean age 34 +/- 10 years) was diluted 50-fold in phosphate-buffered saline (pH 7.4), incubated with increasing concentrations (0.1, 0.5, 0.7, 1, 2 and 3uM) of capsaicin, dihydrocapsaicin and curcumin, and subjected to copper (100uM) induced oxidation. Oxidation kinetics were determined for each serum sample in duplicate by measuring absorbance at 245nm at 37 degree Celsius using a multi-position spectroscope (Cintra 10E UV-VIS , GBC scientific equipments, Victoria, Australia) every 10 min for 300 min. Lag time (before initiation of oxidation) and rate of oxidation (slope of propagation phase) were calculated from the oxidation curves. Results: Lag time increased and rate of oxidation decreased (p<0.05) with the increasing concentrations of the antioxidants. A 50% increase in lag time (from control) was observed at concentrations between 0.5 to 0.7uMfor capsaicin, dihydrocapsaicin and curcumin. Although the rate of oxidation decreased with increasing concentrations of the tested antioxidants, the total oxidation was lower with capsaicin and dihydrocapsaicin compared to curcumin. Conclusion: This study shows that oxidation of serum lipids is reduced by capsaicinoids and curcumin in a concentration-dependent manner." name="DC.description" /> <meta content="2006" name="DC.date" /> <meta content="Conference or Workshop Item" name="DC.type" /> <meta content="PeerReviewed" name="DC.type" /> <meta content="application/pdf" name="DC.format" /> <meta content="http://eprints.utas.edu.au/1411/1/AACB.pdf" name="DC.identifier" /> <meta content="Ahuja, K.D. and Kunde, D.A. and Ball, M.J. and Geraghty, D.P. (2006) Effects of capsaicinoids and curcumin on copper-induced oxidation of human serum. 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style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Ahuja, K.D.</span> and <span class="person_name">Kunde, D.A.</span> and <span class="person_name">Ball, M.J.</span> and <span class="person_name">Geraghty, D.P.</span> (2006) <xhtml:em>Effects of capsaicinoids and curcumin on copper-induced oxidation of human serum.</xhtml:em> In: AIMS AACB Scientific Conference 2006, 23 - 27 Oct 2006, Hobart, Australia.</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_1812' );" href="http://eprints.utas.edu.au/1411/1/AACB.pdf" onmouseout="EPJS_HidePreview( event, 'doc_preview_1812' );"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a><div class="ep_preview" id="doc_preview_1812"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/1411/thumbnails/1/preview.png" class="ep_preview_image" border="0" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/1411/1/AACB.pdf"><span class="ep_document_citation">PDF</span></a> - Requires a PDF viewer<br />174Kb</td></tr></table><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Introduction: Oxidation of low density lipoprotein (LDL) cholesterol is believed to be the first step in the development and progression of atherosclerosis. The active ingredients of spices such as chilli and turmeric (capsaicin and curcumin, respectively) have been shown to reduce the susceptibility of LDL to oxidation. One of the techniques used to study the oxidation of LDL is to isolate and subject LDL to metal-induced (copper or iron) oxidation. However, whole serum may represent a closer situation to in vivo than isolated LDL. Methods: We investigated the effects of different concentrations of capsaicin, dihydrocapsaicin and curcumin on copper-induced oxidation of serum. Serum samples, collected from six fasting healthy individuals (3 men and 3 women, mean age 34 +/- 10 years) was diluted 50-fold in phosphate-buffered saline (pH 7.4), incubated with increasing concentrations (0.1, 0.5, 0.7, 1, 2 and 3uM) of capsaicin, dihydrocapsaicin and curcumin, and subjected to copper (100uM) induced oxidation. Oxidation kinetics were determined for each serum sample in duplicate by measuring absorbance at 245nm at 37 degree Celsius using a multi-position spectroscope (Cintra 10E UV-VIS , GBC scientific equipments, Victoria, Australia) every 10 min for 300 min. Lag time (before initiation of oxidation) and rate of oxidation (slope of propagation phase) were calculated from the oxidation curves. Results: Lag time increased and rate of oxidation decreased (p<0.05) with the increasing concentrations of the antioxidants. A 50% increase in lag time (from control) was observed at concentrations between 0.5 to 0.7uMfor capsaicin, dihydrocapsaicin and curcumin. Although the rate of oxidation decreased with increasing concentrations of the tested antioxidants, the total oxidation was lower with capsaicin and dihydrocapsaicin compared to curcumin. Conclusion: This study shows that oxidation of serum lipids is reduced by capsaicinoids and curcumin in a concentration-dependent manner.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Conference or Workshop Item (Poster)</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/321200.html">320000 Medical and Health Sciences > 321200 Public Health and Health Services</a><br /><a href="http://eprints.utas.edu.au/view/subjects/320000.html">320000 Medical and Health Sciences</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">1411</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Dr Kiran Deep Kaur Ahuja</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">19 Jul 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=1411;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=1411">item control page</a></p> </td></tr></table> </div> <!-- InstanceEndEditable --></td> </tr> <tr> <td><!-- #BeginLibraryItem "/Library/footer_eprints.lbi" --> <table width="795" border="0" align="left" cellpadding="0" class="footer"> <tr valign="top"> <td colspan="2"><div align="center"><a href="http://www.utas.edu.au">UTAS home</a> | <a href="http://www.utas.edu.au/library/">Library home</a> | <a href="/">ePrints home</a> | <a href="/contact.html">contact</a> | <a href="/information.html">about</a> | <a href="/view/">browse</a> | <a href="/perl/search/simple">search</a> | <a href="/perl/register">register</a> | <a href="/perl/users/home">user area</a> | <a href="/help/">help</a></div><br /></td> </tr> <tr><td colspan="2"><p><img src="/images/eprints/footerline.gif" width="100%" height="4" /></p></td></tr> <tr valign="top"> <td width="68%" class="footer">Authorised by the University Librarian<br /> © University of Tasmania ABN 30 764 374 782<br /> <a href="http://www.utas.edu.au/cricos/">CRICOS Provider Code 00586B</a> | <a href="http://www.utas.edu.au/copyright/copyright_disclaimers.html">Copyright & Disclaimers</a> | <a href="http://www.utas.edu.au/accessibility/index.html">Accessibility</a> | <a href="http://eprints.utas.edu.au/feedback/">Site Feedback</a> </td> <td width="32%"><div align="right"> <p align="right" class="NoPrint"><a href="http://www.utas.edu.au/"><img src="http://www.utas.edu.au/shared/logos/unioftasstrip.gif" alt="University of Tasmania Home Page" width="260" height="16" border="0" align="right" /></a></p> <p align="right" class="NoPrint"><a href="http://www.utas.edu.au/"><br /> </a></p> </div></td> </tr> <tr valign="top"> <td><p> </p></td> <td><div align="right"><span class="NoPrint"><a href="http://www.eprints.org/software/"><img src="/images/eprintslogo.gif" alt="ePrints logo" width="77" height="29" border="0" align="bottom" /></a></span></div></td> </tr> </table> <!-- #EndLibraryItem --> <div align="center"></div></td> </tr> </table> </body> </html>