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Fig. 5 | Chinese Medicine

Fig. 5

From: Integrated assessment of medicinal rhubarb by combination of delayed luminescence and HPLC fingerprint with emphasized on bioactivities based quality control

Fig. 5

DL analysis of the commercial rhubarb samples. a OPLS-DA score plots of the DL properties obtained from all batches of commercial rhubarb samples with cross-validation revealed predictive accuracy of 0.527 (Q2) and goodness-of-fit of 0.608 (R2), respectively; b Histograms comparing the DL properties between two groups. *p < 0.05; **p < 0.01; ns, no significant difference (two-tailed, unpaired Student’s t-test). Beta is an index factor associated with the rate of DL decay, I0 is the initial intensity of the DL curve, and T and Tau represents the decay time and DL characteristics, respectively. c DL decay curves of commercial rhubarb sample S10 and S22; d DL decay curves for pooled rhubarb samples from group a and group b. Data are plotted as the mean ± SEM. Note that the data are plotted on a log–log scale

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