Journal
FOOD CHEMISTRY
Volume 416, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2023.135837
Keywords
Triacylglycerols (TAGs); Walnut oil; Adulteration; Pseudotargeted; Chemometrics
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Authentication of walnut oil is challenging due to adulteration with high-linoleic acid vegetable oils. A rapid and sensitive scanning method based on SFC-QTOF-MS was established to profile potential triacylglycerols in adulterated samples. Models based on the triacylglycerol profiles accurately predicted adulteration levels as low as 5% and hold promise for oil authentication.
Authentication of walnut oil (WO) is challenging due to the adulteration of high-linoleic acid vegetable oils (HLOs) with similar fatty acid composition. To allow the discrimination of WO adulteration, a rapid, sensitive and stable scanning method based on supercritical fluid chromatography quadrupole time-of-flight mass spectrometry (SFC-QTOF-MS) was established to profile 59 potential triacylglycerol (TAGs) in HLOs samples within 10 min. Limit of quantitation of the proposed method is 0.002 mu g mL-1 and the relative standard deviations range from 0.7% to 12.0%. TAGs profiles of WO samples from various varieties, geography origins, ripeness, and processing methods were used to construct orthogonal partial least squares-discriminant analysis (OPLS-DA) and OPLS models that were highly accurate in both qualitative and quantitative prediction at adulteration levels as low as 5% (w/w). This study advances the TAGs analysis to characterize vegetable oils and holds promise as an efficient method for oil authentication.
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