Isotopic and multielemental fingerprinting of organically and conventionally grown potatoes.
Isotopes Environ Health Stud
; 53(6): 610-619, 2017 Dec.
Article
in En
| MEDLINE
| ID: mdl-28595462
ABSTRACT
Two marker combinations were used for the differentiation of organically produced from conventionally produced potatoes and also for the geographical origin identification. Fifty-seven samples (from Romanian local producers or imported) were analysed from the stable isotopic (isotope ratio mass spectrometry) and elemental profile (inductively coupled plasma mass spectrometry) point of view. In order to assess the best marker combination, both isotopic and elemental experimental results were subject to chemometric analysis. The statistical tests performed were ANOVA test, Pearson correlation, principal component analysis and linear discriminant analysis (LDA). For a more comprehensive differentiation between organic vs. conventional potato samples, LDA was applied, and 94.7â
% of original cases were correctly classified and the percentage obtained in cross-validation procedure was 91.2â
%. Regarding the geographic origin classification, LDA provided an initial classification of 96.5â
%, while for cross-validation the percentage was 87.7. LDA found δ15N, Cd, Ca, Cu and Zn as best discrimination markers between organically and conventionally grown potatoes. The strongest predictors for Romania vs. foreign geographical areas along LDA were seen to be Ca, P, Co, Ni and δ13C.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Trace Elements
/
Solanum tuberosum
/
Food, Organic
/
Food Analysis
/
Isotopes
Type of study:
Prognostic_studies
Country/Region as subject:
Europa
Language:
En
Journal:
Isotopes Environ Health Stud
Journal subject:
SAUDE AMBIENTAL
Year:
2017
Document type:
Article
Affiliation country:
Romania