Fig. 3

Multivariate statistical analyses of HUVECs treated with OGD at different times based on UHPLC-QTPF/MS data. A PCA of each treatment group and NC group. R½[1] X1 = 0.178 and R½[2] X2 = 0.108 in (1) and R½[1] X1 = 0.175 and R½[2] X2 = 0.0932 in (2). B PLS-DA of each treatment group and NC group. R½[1] X1 = 0.171 and R½[2] X2 = 0.106 in (1) and R½[1] X1 = 0.174 and R½[2] X2 = 0.0922 in (2). PLS-DA: partial least squares discriminant analysis and PCA: principal component analysis; (1) and (2) represent positive ions (left) and negative ions (right)