Lepteridine as a unique fluorescent marker for the authentication of manuka honey

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dc.contributor.author Lin, B en
dc.contributor.author Loomes, Kerry en
dc.contributor.author Prijic, G en
dc.contributor.author Schlothauer, R en
dc.contributor.author Stephens, JM en
dc.date.accessioned 2017-05-29T05:07:01Z en
dc.date.issued 2017-06-15 en
dc.identifier.citation Food Chemistry 225:175-180 15 Jun 2017 en
dc.identifier.issn 0308-8146 en
dc.identifier.uri http://hdl.handle.net/2292/33144 en
dc.description.abstract The recent discovery of two unique manuka marker fluorescence wavelengths (MM1 and MM2) potentially offers a rapid and cost-effective approach for manuka honey authentication using spectroscopy. The fluorophore responsible for the MM1 marker has been identified as leptosperin. We investigated whether lepteridine may be responsible for the MM2 fluorescence. We quantified the lepteridine in manuka honey and manuka nectar, which ranged between 5-52mg/kg and 80-205mg/kg, respectively. Notably, the fluorescent spectrum of synthetic lepteridine matched the MM2 fluorescence signature. Fluorescence quenching was observed in the honey matrix but otherwise, lepteridine was stable over prolonged storage at 37°C. Lepteridine was also found in Australian Leptospermum honeys and nectars. Lepteridine concentration was positively correlated with concentrations of the MM1 fluorescence marker leptosperin in honeys. These findings identify lepteridine as the principle compound responsible for MM2 fluorescence, and support the utility as a marker compound for manuka honey authentication. en
dc.format.medium Print-Electronic en
dc.language eng en
dc.publisher Elsevier BV en
dc.relation.ispartofseries Food Chemistry en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.subject Pteridines en
dc.subject Spectrometry, Fluorescence en
dc.subject Honey en
dc.subject Biomarkers en
dc.title Lepteridine as a unique fluorescent marker for the authentication of manuka honey en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.foodchem.2016.12.099 en
pubs.begin-page 175 en
pubs.volume 225 en
dc.rights.holder Copyright: Elsevier BV en
dc.identifier.pmid 28193412 en
pubs.end-page 180 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 610005 en
pubs.org-id Science en
pubs.org-id Biological Sciences en
pubs.org-id Science Research en
pubs.org-id Maurice Wilkins Centre (2010-2014) en
pubs.record-created-at-source-date 2017-05-29 en
pubs.dimensions-id 28193412 en

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