Table 7. The load matrix and eigenvectors of each principal component

Indicators	PCA1		PCA2
	Load matrix	Eigenvectors	Load matrix	Eigenvectors
pH	0.555	0.345	0.676	0.556
a*	–0.495	–0.308	0.774	0.636
Springiness	–0.566	–0.352	–0.588	–0.483
TBARS	0.912	0.568	–0.264	–0.217
TVB-N	0.936	0.583	–0.089	–0.073

a, the redness value of colour.
PCA, principal component analysis; TBARS, thiobarbituric acid reactive substances; TVB-N, total volatile basic nitrogen.