Table 1.

Active matrix (metalloporphyrines) used to coat the quartz crystal microbalance sensors of LibraNose 2.1 e-nose [18].

Sensor	Metalloporphorines
1	Co-butoxytetraphenylporphyrine
2	Mn-butoxytetraphenylporphyrine
3	Cr-butoxytetraphenylporphyrine
4	Cu-butoxytetraphenylporphyrine
5	Ru-butoxytetraphenylporphyrine
6	Zn-butoxytetraphenylporphyrine
7	Sn-butoxytetraphenylporphyrine
8	Fe-butoxytetraphenylporphyrine