Table 2.

List of publications related to the application of combined ET and EN.

Food Matrix	Aim of the Study	ET	EN	Data-Fusion Method	Ref.
Black tea	Quality assessment of black tea	5 electrodes made of 5 different noble metals	5 commercial MOS sensors	Mid-level of extracted features (wavelet)	[22]
Virgin olive oils	Characterize virgin olive oils from different geographical areas	4 electrodes of different metals	5 commercial MOS sensors	Low-level	[23]
Rice wines	Evaluating the marked ages of rice wines	3 types of modified electrodes with conducting polymer	12 MOS sensors	Low-level	[72]
Chinese Robusta coffees	Characterizationand classification of Chinese Robusta coffee cultivars	Commercial e-tongue	Commercial e-nose	Low-level	[73]
Black tea	Classification of different grade of black tea	5 electrodes made of 5 different noble metals	5 commercial MOS sensors	Mid-level of extracted features (wavelets)	[74]
Orthosiphon stamineus	Classification of Orthosiphon stamineus	7 commercial ion-selective sensors	Commercial e-nose	Low-level	[75]
Meat	Recognition of organoleptic characteristics of minced mutton adulterated with pork	Commercial taste system	Commercial e-nose	Low-level fusion and mid-level fusion	[76]
Cherry tomato juices	Authentication of fresh cherry tomato juices adulterated with overripe tomato juices	Commercial e-tongue	Commercial e-nose	Low-level; mid-level with selected features (PCA scores, F selection, stepwise selection)	[77]
Edible oil	Detection of the blending ratio of old frying oil and new edible-oil	Gold electrode	8 commercial gas sensors	Low-level	[78]
Mushroom	Detection of submerged fermentation	Commercial e-tongue	10 commercial MOS sensors	Low-level	[79]