Italian tomato-based products authentication by multi-element approach: A mineral elements database to distinguish the domestic provenance

Abstract In this study, we propose a novel mineral elements database for the authentication of Italian processed tomato, able to discriminate the domestic provenance from the Chinese, US and Spanish ones. Multi-element analyses by Inductively Coupled Plasma orthogonal acceleration Time-of-Flight Mass Spectrometry (ICP-oa-TOF-MS) and Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) were used for quantifying 26 mineral elements (Li, Be, Na, Mg, Al, K, Ca, V, Cr, Mn, Co, Cu, Zn, Ga, As, Rb, Sr, Ag, Cd, In, Cs, Ba, Tl, Pb, Bi and U) in 183 tomato-based samples of different origin (Italy, China, US and Spain) collected in three different years of production (2013, 2015 and 2017). Linear Discriminant Analysis (LDA) applied to 28 variables (single elements + elemental ratios) allowed excellent separation between Italian and non-Italian tomato samples. Three elemental ratios (Li/Cu, Co/Rb and Sr/Cd) resulted highly effective in identifying the domestic provenance of tomato (100% prediction ability of the model and 98.8% in cross-validation). This result highlighted that ratios between elements were more important than single elements in discrimination.

[1]  H.M.N.H. Irving,et al.  17 – NOMENCLATURE, SYMBOLS, UNITS AND THEIR USAGE IN SPECTROCHEMICAL ANALYSIS–II. DATA INTERPRETATION* , 1978 .

[2]  Maurizio Aceto,et al.  Authentication and traceability study of hazelnuts from piedmont, Italy. , 2009, Journal of agricultural and food chemistry.

[3]  T. Mikysek,et al.  Multi-elemental analysis of sulfuric acid by oaTOF-ICP-MS after matrix modification with barium bromide , 2015 .

[4]  R. Vidrih,et al.  Stable isotope ratio and elemental composition parameters in combination with discriminant analysis classification model to assign country of origin to commercial vegetables – A preliminary study , 2017 .

[5]  C. Vandecasteele,et al.  ‘Zone model’ as an explanation for signal behaviour and non-spectral interferences in inductively coupled plasma mass spectrometry , 1993 .

[6]  E. Frýdová,et al.  Analytical capabilities of inductively coupled plasma orthogonal acceleration time-of-flight mass spectrometry (ICP-oa-TOF-MS) for multi-element analysis of food and beverages. , 2011, Food chemistry.

[7]  G. Sindona,et al.  Authenticity of PGI "Clementine of Calabria" by multielement fingerprint. , 2012, Journal of agricultural and food chemistry.

[8]  H. Liu,et al.  The determination and application of (87) Sr/(86) Sr ratio in verifying geographical origin of wheat. , 2017, Journal of mass spectrometry : JMS.

[9]  E. Perri,et al.  Determination of trace element in Italian virgin olive oils and their characterization according to geographical origin by statistical analysis. , 2007, Analytica chimica acta.

[10]  A. Rossmann,et al.  The combination of stable isotope abundance ratios of H, C, N and S with 87Sr/86Sr for geographical origin assignment of orange juices , 2010 .

[11]  C. Barbante,et al.  Determination of rare earth elements in tomato plants by inductively coupled plasma mass spectrometry techniques. , 2009, Rapid communications in mass spectrometry : RCM.

[12]  Maurizio Aceto,et al.  A traceability study on the Moscato wine chain. , 2013, Food chemistry.

[13]  M. J. Adams,et al.  Chemometrics in Analytical Spectroscopy , 1995 .

[14]  C. E. Efstathiou,et al.  Geographical Characterization of Greek Olive Oils Using Rare Earth Elements Content and Supervised Chemometric Techniques , 2012 .

[15]  Georgios P. Danezis,et al.  Food authentication: state of the art and prospects , 2016 .

[16]  P. Kump,et al.  Isotopic and elemental characterisation of Slovenian apple juice according to geographical origin: Preliminary results. , 2016, Food chemistry.

[17]  G. Sindona,et al.  Investigating the origin of tomatoes and triple concentrated tomato pastes through multielement determination by inductively coupled plasma mass spectrometry and statistical analysis. , 2010, Journal of agricultural and food chemistry.

[18]  Iva Urbanová,et al.  Multi-element analysis of milk by ICP-oa-TOF-MS after precipitation of calcium and proteins by oxalic and nitric acid. , 2013, Talanta.

[19]  A. Saint,et al.  Analytical characteristics of a commercial ICP orthogonal acceleration time-of-flight mass spectrometer (ICP-TOFMS) , 2000 .

[20]  A. Kaufmann,et al.  Multivariate Statistics as a Classification Tool in the Food Laboratory , 1997 .

[21]  P. Trincherini,et al.  Precise determination of strontium isotope ratios by TIMS to authenticate tomato geographical origin. , 2014, Food chemistry.

[22]  S. Ruth,et al.  An overview of analytical methods for determining the geographical origin of food products , 2008 .

[23]  Matthew S. Wheal,et al.  A cost-effective acid digestion method using closed polypropylene tubes for inductively coupled plasma optical emission spectrometry (ICP-OES) analysis of plant essential elements , 2011 .

[24]  T. Černohorský,et al.  Multi-element analysis of urine by inductively coupled plasma orthogonal acceleration time-of-flight mass spectrometry , 2011 .

[25]  R. Wehrens,et al.  Traceability along the production chain of Italian tomato products on the basis of stable isotopes and mineral composition. , 2011, Rapid communications in mass spectrometry : RCM.

[26]  Akbar Montaser,et al.  Inductively coupled plasmas in analytical atomic spectrometry , 1987 .

[27]  Xin Liu,et al.  Determining the geographical origin of Chinese green tea by linear discriminant analysis of trace metals and rare earth elements: Taking Dongting Biluochun as an example , 2016 .

[28]  Erin Ehrlinger,et al.  Use of laser ablation-inductively coupled plasma-time of flight-mass spectrometry to identify the elemental composition of vanilla and determine the geographic origin by discriminant function analysis. , 2013, Journal of agricultural and food chemistry.

[29]  F. Barbosa,et al.  The use of advanced chemometric techniques and trace element levels for controlling the authenticity of organic coffee , 2014 .

[30]  Robert J. Thomas.  Practical guide to ICP-MS , 2003 .

[31]  Simon D. Kelly,et al.  Tracing the geographical origin of food: The application of multi-element and multi-isotope analysis , 2005 .

[32]  K. H. Laursen,et al.  Multielemental fingerprinting as a tool for authentication of organic wheat, barley, faba bean, and potato. , 2011, Journal of agricultural and food chemistry.

[33]  G. Sindona,et al.  Multielement fingerprinting as a tool in origin authentication of PGI food products: Tropea red onion. , 2011, Journal of agricultural and food chemistry.