Stable isotope (δ13C) profiling of xylitol and sugar in South Africa

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dc.citation.doi10.17159/sajs.2017/20160276en_ZA
dc.citation.issue5-6en_ZA
dc.contributor.authorSymes, C.
dc.contributor.authorLoubser, E.
dc.contributor.authorWoodborne, S.
dc.date.accessioned2017-10-12T10:11:54Z
dc.date.available2017-10-12T10:11:54Z
dc.date.issued2017-05
dc.description.abstractXylitol is an alternative sweetener to sucrose, glucose and fructose, and is available under a number of brands in South Africa. Carbon stable isotope values (δ13C) of a selection of commercially available xylitol products (n=28) were analysed and compared with sugar samples (n=29). Sugarcane (C4) and beet sugar (C3) derived sugar samples aligned with published values of source, although two samples that indicated a sugarcane origin suggested a beet sugar origin. Control corn-derived samples defined a stepwise xylose to xylitol discrimination of +0.7‰. The distinction between C3- and C4-derived xylitol was less clear with three samples difficult to define (range = -14.8 to -17.1‰). The values for a suite of xylitol samples (-22.3‰ to -19.7‰; n=8) that aligned closely with a suspected C3-derived xylose, were ~8‰ more positive than known birch isotope values. Some xylitol samples may thus represent (1) a mixture of C3- and C4-derived products, (2) derivation from a CAM species source or (3) different processing techniques in which the discrimination values of xylose from corn, and xylose from birch, may differ because of the respective chemical processing techniques. No samples that claimed a birch bark origin were within the range of samples suggested to be corn derived (i.e. -13.0‰ to -9.7‰, n=16). We suggest that the threshold values provided are relatively robust for defining the origins of xylitol and sugar, and can be used in determining the authenticity and claims of suppliers and producers.en_ZA
dc.description.librarianEM2017en_ZA
dc.identifier.citationSymes, C, Loubser, E. and Woodborne, S. 2017. Stable isotope (δ13C) profiling of xylitol and sugar in South Africa. SOUTH AFRICAN JOURNAL OF SCIENCE 113(5-6), Article number 20160276.en_ZA
dc.identifier.issn0038-2353 (Print)
dc.identifier.issn1996-7489 (Online)
dc.identifier.urihttp://hdl.handle.net/10539/23246
dc.journal.titleSOUTH AFRICAN JOURNAL OF SCIENCEen_ZA
dc.journal.volume113en_ZA
dc.language.isoenen_ZA
dc.publisherAcademy of Science of South Africa (ASSAf)en_ZA
dc.rights© 2017. The Author(s). Published under a Creative Commons Attribution Licence.en_ZA
dc.subjectsucroseen_ZA
dc.subjectdisaccharideen_ZA
dc.subjectmaizeen_ZA
dc.subjectsugarcaneen_ZA
dc.subjectsugar beeten_ZA
dc.subjectbirchen_ZA
dc.titleStable isotope (δ13C) profiling of xylitol and sugar in South Africaen_ZA
dc.typeArticleen_ZA
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