elemental analysis (4)


The quality and price of tea produced in different regions varies greatly, and this research investigated whether elemental content determined by X-ray fluorescence (XRF) spectroscopy can indicate origin of commercial teas. A total of 75 tea samples from tea producing countries throughout the world were analysed for their elemental content, and 18 elements were selected for analysis based on their repeatability performance. Tea origin was determined by multivariate classification of the tea into 5 major geographical regions then two regions, Asian and non-Asian. The Asian vs non-Asian classification of the teas reached an 85% correct prediction rate.

Read the abstract here

Read more…

4469687685?profile=RESIZE_400xThis review maps the current state of research in the area of the geographical origin of agricultural products and food. The review is divided in three parts. The first part deals with the analytical techniques applied in the food authentication, with special mention of the use of elemental analysis and multiple isotope ratios. The second section focuses on published research data for geographical origin authentication for the period 2015–2019. The third part contains the results on certification of geographical origin on specific agricultural products.drawn from the published articles in the period 2015–2019. 

Read the full paper

Read more…

Floral Origin of Honey by Elemental Analysis

In this study, the concentrations of K, Ca, Mg, Na, P, and S and element ratios were determined in 140 Hungarian mono-floral honey samples (acacia, linden, sunflower, rape, chestnut, forest, silk grass, and facelia) by inductively coupled plasma-optical emission spectrometry (ICP-OES). The results were chemometrically analysed using one-way ANOVA (LSD and Dunnett T3 test) and linear discriminant analysis (LDA) to determine the botanical origin based on the element content and element ratio of different honey types. Examination of element ratios showed that K/Na and K/Mg ratios were able to separate every honey type from each other with 100% cross-validation. 

Read the abstract at: Floral origin of honey

Read more…

This study examines the variations in isotopes and trace elements in relation to grape variety, environmental factors and provenance in order to address the wine authenticity in Cyprus. ICP-AES assessed the wines’ elemental content. SNIF-NMR and isotope ratio mass spectrometry methodologies determined in authentic and commercial wines the distribution of the naturally occurring stable isotopes of the deuterium/hydrogen (D/H) ratios and carbon (13/12C) in ethanol of wine and oxygen ratio (18/16O) in wine water. PCA (principle component analysis) highlighted the importance of grape variety and provenance, while supervised analysis pinpointed the vineyard effect and highlighted the contribution of the vintage year. These results can be incorporated to the EU Wine Isotopic Databank database providing both a guide and a tool for eventual candidatures for denomination of origin and support both Cypriot wine and winemakers. 

Read the abstract at: http://link.springer.com/article/10.1007/s12161-017-0959-2
Read more…