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A high‐field 1 H nuclear magnetic resonance study of the minor components in virgin olive oils
Author(s) -
Sacchi R.,
Patumi M.,
Fontanazza G.,
Barone P.,
Fiordiponti P.,
Mannina L.,
Rossi E.,
Segre A. L.
Publication year - 1996
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02517951
Subject(s) - chemistry , acetic acid , olive oil , nuclear magnetic resonance spectroscopy , acid value , phenols , aldehyde , olea , degree of unsaturation , chromatography , organic chemistry , analytical chemistry (journal) , food science , botany , catalysis , biochemistry , biology
High‐field (600 MHz) nuclear magnetic resonance (NMR) spectroscopy was applied to the direct analysis of virgin olive oil. Minor components were studied to assess oil quality and genuineness. Unsaturated and saturated aldehyde resonances, as well as those related to other volatile compounds, were identified in the low‐field region of the spectrum by two‐dimensional techniques. Unsaturated aldehydes can be related to the sensory quality of oils. Other unidentified peaks are due to volatile components, because they disappear after nitrogen fluxing. The statistical analysis performed on the intensity of these peaks in several oil samples, obtained from different olive varieties, allows clustering and identification of oils arising from the same olive variety. Diacylglycerols, linolenic acid, other volatile components, water, acetic acid, phenols, and sterols can be detected simulteneously, suggesting a useful application of high‐field NMR in the authentication and quality assessment of virgin olive oil.