Hybrid Electronic Tongues Applied to the Quality Control of Wines

Table 4

Relative errors obtained in the quantification of chemical parameters using the PLS regression for a set of red wines.

Sample	VAD	Total acidity	pH	[Ca^2+]	[K^+]	Glycerol
Trepat	4.45	0.6	2.20	5.1	4.0	8.8
Grenache	4.05	7.7	1.34	6.1	6.7	2.3
Merlot 2007	2.31	2.6	0.91	3.9	0.7	3.8
Merlot 2008	6.52	8.0	2.03	2.4	3.2	5.6
Cabernet S.	0.99	9.0	4.01	8.7	8.5	2.7
Mean error (%)	3.66	5.6	2.10	5.2	4.6	4.6