Excited-state dynamics of astaxanthin aggregates
Excited-state dynamics of astaxanthin aggregates
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DOI：
10.1016/j.cplett.2013.03.009
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发表时间：
2013-05-01
影响因子：
2.8
通讯作者：
Polivka, Tomas
中科院分区：
文献类型：
--
作者：
Fuciman, Marcel;Durchan, Milan;Polivka, Tomas
虾青素在水合二甲基亚砜(DMSO)中形成三种类型的聚集体。当DMSO与水的摩尔比为1：1时，生成红移的J-聚集体，最大峰位于570 nm；当DMSO/水的摩尔比为1：9时，生成的H-聚集体蓝移，峰位于386 nm(H1)和460 nm(H2)。在二甲亚砜中，虾青素单体的S-1寿命为5.3ps，但也发现了一个长寿命(33ps)的S*信号。聚集将S-1的寿命改变为17ps(H1)、30ps(H2)和14ps(J)。在H1和H2聚集体中观察到虾青素的三重态，很可能是通过单重态同质分裂产生的。(C)2013爱思唯尔B.V.保留所有权利。
Astaxanthin forms three types of aggregates in hydrated dimethyl sulfoxide (DMSO). In DMSO/water ratio of 1:1, a red-shifted J-aggregate with maximum at 570 nm is generated, while a ratio of 1:9 produces blue-shifted H-aggregates with peaks at 386 nm (H1) and 460 nm (H2). Monomeric astaxanthin in DMSO has an S-1 lifetime of 5.3 ps, but a long-lived (33 ps) S* signal was also identified. Aggregation changes the S-1 lifetimes to 17 Ps (H1), 30 Ps (H2), and 14 ps (J). Triplet state of astaxanthin, most likely generated via singlet homofission, was observed in H1 and H2 aggregates. (C) 2013 Elsevier B.V. All rights reserved.