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. 2023 Nov 10;20:100998. doi: 10.1016/j.fochx.2023.100998

Fig. 2.

Fig. 2

Screening of important differential metabolites between spring and summer tea. Score plot of partial least square discriminant analysis (PLS-DA) plot based on tea pigments and chromaticity values; (B) Validation model of PLS-DA with 200 permutation tests (R2 = 0.39, Q2 = 0.30, Intercept R2 = 0.05, Intercept Q2 = -0.15); (C) PLS-DA plot based on tea taste metabolites; (D) Validation model of PLS-DA with 200 permutation tests (R2 = 0.55, Q2 = 0.47, Intercept R2 = 0.06, Intercept Q2 = -0.21); (E) VIP values of PLS-DA based on tea pigments and chromaticity values; (F) VIP values of PLS-DA based on tea taste metabolites. GC, gallocatechin; EGC, epigallocatechin; C, catechin; CAF, caffeine; EC, epicatechin; EGCG, epigallocatechin gallate; ECG, epicatechin gallate; CG, catechin gallate; Thea, theanine; Glu, glutamic acid; Asp, aspartic acid; Asn, asparagine; Ala, alanine; Thr, threonine; Ser, serine; Gly, glycine; Pro, proline; Val, valine; Ile, isoleucine; Leu, leucine; Tyr, tyrosine; Phe, phenylalanine; Trp, tryptophane; Arg, argnine; TRs, thearubigins; TBs, theabrownins; TF, theaflavin; TF-3-G, theaflavin-3-gallate; TFDG, theaflavin-3,3′-gallate; TF-3′-G, theaflavin-3′-gallate; L*, lightness; a* represents the degree of greenness (negative)-redness (positive); b* represents the degree of blueness (negative)-yellowness (positive).