TY - JOUR T1 - Perception of olive oils sensory defects using a potentiometric taste device. AU - Veloso,Ana C A, AU - Silva,Lucas M, AU - Rodrigues,Nuno, AU - Rebello,Ligia P G, AU - Dias,Luís G, AU - Pereira,José A, AU - Peres,António M, Y1 - 2017/08/31/ PY - 2017/05/31/received PY - 2017/08/15/revised PY - 2017/08/20/accepted PY - 2017/9/18/entrez PY - 2017/9/18/pubmed PY - 2018/9/7/medline KW - Chemometrics KW - Olive oil KW - Potentiometric electronic tongue KW - Sensory analysis KW - Sensory defects SP - 610 EP - 618 JF - Talanta JO - Talanta VL - 176 N2 - The capability of perceiving olive oils sensory defects and intensities plays a key role on olive oils quality grade classification since olive oils can only be classified as extra-virgin if no defect can be perceived by a human trained sensory panel. Otherwise, olive oils may be classified as virgin or lampante depending on the median intensity of the defect predominantly perceived and on the physicochemical levels. However, sensory analysis is time-consuming and requires an official sensory panel, which can only evaluate a low number of samples per day. In this work, the potential use of an electronic tongue as a taste sensor device to identify the defect predominantly perceived in olive oils was evaluated. The potentiometric profiles recorded showed that intra- and inter-day signal drifts could be neglected (i.e., relative standard deviations lower than 25%), being not statistically significant the effect of the analysis day on the overall recorded E-tongue sensor fingerprints (P-value = 0.5715, for multivariate analysis of variance using Pillai's trace test), which significantly differ according to the olive oils' sensory defect (P-value = 0.0084, for multivariate analysis of variance using Pillai's trace test). Thus, a linear discriminant model based on 19 potentiometric signal sensors, selected by the simulated annealing algorithm, could be established to correctly predict the olive oil main sensory defect (fusty, rancid, wet-wood or winey-vinegary) with average sensitivity of 75 ± 3% and specificity of 73 ± 4% (repeated K-fold cross-validation variant: 4 folds×10 repeats). Similarly, a linear discriminant model, based on 24 selected sensors, correctly classified 92 ± 3% of the olive oils as virgin or lampante, being an average specificity of 93 ± 3% achieved. The overall satisfactory predictive performances strengthen the feasibility of the developed taste sensor device as a complementary methodology for olive oils' defects analysis and subsequent quality grade classification. Furthermore, the capability of identifying the type of sensory defect of an olive oil may allow establishing helpful insights regarding bad practices of olives or olive oils production, harvesting, transport and storage. SN - 1873-3573 UR - https://www.unboundmedicine.com/medline/citation/28917798/Perception_of_olive_oils_sensory_defects_using_a_potentiometric_taste_device_ DB - PRIME DP - Unbound Medicine ER -