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Spectroscopic, stability and radical-scavenging properties of a novel pigment from gardenia

Chen, Yang, Cai, Le, Zhao, Can, Xu, Hui-chuan, Cao, Cheng-yong, Liu, Ying, Jia, Lin, Yin, Hong-Xiang, Chen, Chu, Zhang, Hao
Food chemistry 2008 v.109 no.2 pp. 269-277
spectroscopy, free radical scavengers, plant pigments, Gardenia, antioxidant activity, chemical analysis, chemical composition, fruits (food), fruit extracts
A novel pigment, named gardecin, has been isolated from gardenia fruits, together with another five known crocins. The pigment, which possessed a structure which is unique among crocins, was characterised using spectrometric techniques, particularly 1D and 2D NMR. The NMR assignments were based on data from ¹H NMR, ¹³C NMR, DEPT, ¹H-¹H COSY, NOESY, HMQC and HMBC measurements. The five known crocins were identified on the basis of MS, UV/visible and 1D NMR data. Chemical stability and antioxidant ability of gardecin in comparison with the other five crocins were studied. The stronger DPPH free radical-scavenging ability of gardecin compared, with the other crocins, was observed. Kinetic studies have shown that all crocins were unstable under various conditions, but surprisingly gardecin was fairly stable.