The pigments and its stability in Zijuan sun-dried green tea were investigated in this study. The pigments from Zijuan sun-dried green tea were extracted by acidic methanol-H2O solution and H2O, and the main compounds were identified by means of HPLC-ESI-MS/MS techniques. 14 anthocyanin, 24 flavonols, 8 phenolics and theaflavins and 3 alkaloids were identified from the extracts of Zijuan sun-dried green tea. The main anthocyanins, such as Cyanidin-3-glucoside, Cyaniding-3-galactoside, Cyanidin-3-O-(6-p-coumaroyl)-glucoside, Delphinidin-3- glucoside, Delphinidin-3-rutinoside, Delphinidin-3-O-(6-p-coumaroyl)-glucoside, Prodelphinidin B-2(or 4)3′-O- gallate, Procyanidin B-2(or 4)3′-O-gallate, Petunidin-3-glc-4-vinylphenol and Malvidin-3-glc-4- vinylepicatechin etc were identified in Zijuan sun-dried green tea. The pigment extracted from Zijuan sun-dried green tea by using acidic methanol-methanol-H2O as solvent showed good water-solubility and was stable to light and heat in acid environment, but sensitive to the pH value of environment, oxidizer and reducer. The maximum adsorption wavelength for the pigment is 538nm under pH 1.0. Fe2+ and Cu2+ can change the color of the pigments and stability was decreased. The substance of the purple colour in Zijuan sun-dried green tea was clarified by HPLC-ESI-MS/MS analysis.
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