An analytical approach to Sr isotope ratio determination in Lambrusco wines for geographical traceability purposes. (15th April 2015)

• Record Type: Journal Article
• Authors: Durante, Caterina; Baschieri, Carlo; Bertacchini, Lucia; Bertelli, Davide; Cocchi, Marina; Marchetti, Andrea; Manzini, Daniela; Papotti, Giulia; Sighinolfi, Simona
• Is Part Of: Food chemistry. Volume 173(2015)
• Page Start: 557
• Page End: 563
• Publication Date: 2015-04-15
• Subjects: 87Sr/86Sr ratio -- Lambrusco PDO wines -- Geographic traceability -- MC-ICP/MS; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2014.10.086
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: A low temperature digestion procedure was tested for wines mineralisation. Modena Lambrusco PDO wines collected from four vintages, 2009–2012, were analysed. Results were compared with isotopic values of soils and wines coming from different district. Tracing and discriminatory power of 87 Sr/ 86 Sr was investigated. Abstract: Geographical origin and authenticity of food are topics of interest for both consumers and producers. Among the different indicators used for traceability studies, 87 Sr/ 86 Sr isotopic ratio has provided excellent results. In this study, two analytical approaches for wine sample pre-treatment, microwave and low temperature mineralisation, were investigated to develop accurate and precise analytical method for 87 Sr/ 86 Sr determination. The two procedures led to comparable results (paired t -test, with t < t crit ). Furthermore, the precision of the whole analytical procedure was evaluated by using a control sample (wine sample), processed during each sample batch (calculated Relative Standard Deviation, RSD%, equal to 0.002%. Lambrusco PDO (Protected Designation of Origin) wines coming from four different vintages (2009, 2010, 2011 and 2012) were pre-treated according to the best procedure and their isotopic values were compared with isotopic data coming from (i) soils of their territory of origin and (ii) wines obtained by same grape varieties cultivated in different districts. The obtained results have shown no significant variability among the different vintages of wines and a perfect agreement between the isotopic range of the soils and wines has been observed. Nevertheless, the investigated indicator was not enough powerful to discriminate between similar products. To this regard, it is worth to note that more soil samples as well as wines coming from different districts will be considered to obtain more trustworthy results.