Naslov
Determination of 87Sr/86Sr ratio in truffles from Istria, Croatia

Autori
Nikezić, Majda ; Goltnik, Tjaša ; Furdek Turk, Martina ; Ivanić, Maja ; Fiket, Željka ; Mešić, Armin ; Zgrablić, Željko ; Zuliani, Tea

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
28th Annual Meeting of the Slovenian Chemical Society : Book of abstracts / Albin, Pintar - Ljubljana : Slovensko kemijsko društvo, 2022, 214-214

ISBN
978-961-95922-1-2

Skup
28th Annual Meeting of the Slovenian Chemical Society

Mjesto i datum
Portorož, Slovenija, 21.09.2022. - 23.09.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
truffles ; geographical origin ; Sr isotope ratio ; MC-ICP-MS

Sažetak
Despite the large number of discovered truffle species, only a few of them are in great demand on the food market. Tuber melanosporum, commonly known as „the black diamond” in the gourmet culinary world, is considered to have the most complex aroma, while Tuber aestivum, widely appreciated in Mediterranean countries, is less aromatic. The decrease in productivity of this mushroom delicacy observed in the last decades, as well as forecasts based on climate models predicting a significant decline in European truffle yield in the near future, lead to a stark mismatch between supply and demand. These estimates, along with the difficulties concerning collecting, cultivating and storing truffles, have affected their market price. As a consequence, the truffle market became prone to fraudulent activities. In order to tackle the challenge of ubiquitous truffle fraud, numerous analytical tools were developed. Isotopic and elemental characterisation have successfully been used for tracing geographical origin of many food products. While previous studies have mostly focused on light elements’ isotopes, strontium isotope composition is underused, relatively new approach that has shown a great potential for the designation of origin. Considering the fact that truffles’ life cycle occurs underground and is completely dependent on the presence of the host tree, the 87Sr/86Sr ratios, being inherited from a particular geological environment, could provide crucial information for this process. Genetic and environmental variations, as well as the insufficiently explored soil ecology and its relationship with truffles and their host plants, may influence the Sr isotopic signatures of truffles. The present study aims to examine the Sr composition of truffles harvested in Croatia, as well as to evaluate the association between Sr isotopic profiles of truffles with those of soil and bark samples belonging to mycorrhizal partner trees obtained from the same sampling locations. For this purpose, 23 samples of summer truffle (T. aestivum) and 7 samples of black truffle (T. melanosporum), 30 corresponding soil samples and 26 corresponding tree bark samples were collected and analyzed. The total strontium concentration in the samples was determined by inductively coupled mass spectrometry, after microwave-assisted acid digestion, while the 87Sr/86Sr ratio was determined by multicollector ICP-MS. The obtained results show big variations in 87Sr/86Sr ratios within truffle samples (0.70838 – 0.71492), however, there is a good agreement between the Sr isotope ratio of truffles and the corresponding soil and tree bark samples, which suggests that the truffles reflect the local geochemistry of the environment in which they grow.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Interdisciplinarne prirodne znanosti

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