Table 4: Eigenvalues and cumulative variances of the first five principal components.

VariablesPC1PC2PC3PC4

Alcoholic grade0.6044−0.47890.1078−0.0229
pH−0.60460.14200.1327−0.0762
Acetaldehyde0.13080.57910.45020.3579
n-propanol0.04990.21630.7784−0.4609
Acetic acid0.5419−0.49540.09320.4859
Isobutanol0.34070.76910.24540.1995
Isoamylic0.62770.6165−0.26260.2052
Higher alcohols0.62570.73440.1686−0.0009
Sulfate−0.66850.3758−0.05990.3816
Acetate−0.49490.28720.08760.4114
Copper−0.23630.02750.65270.2403