Free radicals from eumelanins: quantum yields and wavelength dependence.
Free radicals from eumelanins: quantum yields and wavelength dependence.
复制标题
真黑素自由基：量子产率和波长依赖性。
DOI：
10.1016/0003-9861(84)90575-7
复制
发表时间：
1984
影响因子：
3.9
通讯作者：
Sealy,RC
中科院分区：
文献类型：
--
作者：
Sarna,T;Sealy,RC
用电子自旋共振波谱法研究了天然真黑素（来自牛眼睛）和合成黑素（来自3,4-二羟基苯丙氨酸）光诱导自由基的形成。测定的天然黑色素的作用谱与合成黑色素的作用谱非常相似，并且不受去除相关蛋白质的影响。作用光谱与光学吸收光谱的比较表明，前者具有更明显的波长依赖性，这表明自由基产生最活跃的发色团不是吸收可见光的主要黑色素发色团。自由生产的量子产率的测量已经在600到230纳米的波长范围内进行。天然真黑素产生自由基的效率大约是合成材料的三倍。虽然检测到的黑色素自由基的产生是独立于氧的，但与耗氧量的相关性是明显的；产生自由基的量子产率大约是在类似条件下消耗氧气的量子产率的三倍。讨论了可能的原因。
Formation of light-induced free radicals from natural eumelanin (from bovine eyes) and synthetic melanin (from oxidation of 3,4-dihydroxyphenylalanine) has been studied by electron spin resonance spectroscopy. Action spectra measured for natural melanins are very similar to that found for synthetic melanin, and are unaffected by the removal of associated protein. A comparison of action spectra with optical absorbance spectra shows that the former has a more marked wavelength dependence, suggesting that the chromophore that is most active in free-radical production is not the major melanin chromophore that absorbs visible light. Measurements of quantum yields for freeradical production have been made over a wavelength range from 600 to 230 nm. The efficiency of radical production from natural eumelanin is about three times greater than from the synthetic material. Although production of the melanin radicals detected is independent of oxygen, some correlation with oxygen consumption is evident; quantum yields for radical production are approximately three times those for oxygen consumption obtained under similar conditions. Possible reasons for this are discussed.
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黑色素体（黑色素颗粒）中黑色化与酪氨酸酶活性之间的相互关系。
影响因子：
2.7
作者：
M. Seiji;Thomas B. Fitzpatrick
通讯作者：
Thomas B. Fitzpatrick
DOI：
10.1016/0006-291x(79)92070-9
发表时间：
1979-01-01
影响因子：
3.1
作者：
FELIX, CC;HYDE, JS;SEALY, RC
通讯作者：
SEALY, RC
影响因子：
3.9
作者：
COPE, FW;SEVER, RJ;POLIS, BD
通讯作者：
POLIS, BD
DOI：
10.1016/0006-291x(78)90175-4
发表时间：
1978-01-01
影响因子：
3.1
作者：
FELIX, CC;HYDE, JS;SEALY, RC
通讯作者：
SEALY, RC
黑色素与氧的相互作用。
影响因子：
3.9
作者：
T. Sarna;A. Duleba;W. Korytowski;H. Swartz
通讯作者：
H. Swartz