Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 54, Issue 13, Pages 4506-4516Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf0600455
Keywords
geographic authenticity; principal component analysis; canonical discriminant analysis; elemental analysis; stable isotope; strawberry (Fragaria x ananassa); blueberry (Vaccinium caesariense/corymbosum; pear (Pyrus communis); geographic origin; food labeling; linear discriminant function; quadratic discriminant function; hierarchal tree; neural network; genetic neural network; modeling
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Classifications of geographic growing origin of three fresh fruits combining elemental profiles with various modeling approaches were determined. Elemental analysis (Ca, Cd, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, P, V, and Zn) of strawberry, blueberry, and pear samples was performed using inductively coupled plasma argon atomic emission spectrometer. Bulk stable carbon and nitrogen isotope analyses in pear were performed using mass spectrometry as an alternative fingerprinting technique. Each fruit, strawberry (Fragaria x ananassa), blueberry ( Vaccinium caesariense/corymbosum), and pear ( Pyrus communis), was analyzed from two growing regions: Oregon vs Mexico, Chile, and Argentina, respectively. Principal component analysis and canonical discriminant analysis were used for data visualization. The data were modeled using linear discriminant function, quadratic discriminant function, neural network, genetic neural network, and hierarchical tree models with successful classification ranging from 70 to 100% depending on commodity and model. Effects of Oregon subregional and variety classification were investigated with similar success rates.
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