Strzelecka T
Physiol Chem Phys. 1982;14(3):223-31.
Basic semiconductor characteristics of natural melanins isolated from bovine eye, human dark hair, and banana peel were obtained by means of the dc dark conductivity experiments and optical absorption measurements. The results were compared with results obtained for synthetic melanin. Specific conductivity in natural melanins is of the order 10(-11) omega -1 cm-1 and in synthetic melanin 10(-8) omega -1 cm-1. Thermal activation energies in the range 298-333 degrees K are eye melanin, 0.93 eV; hair melanin, 1.01 eV; banana melanin, 1.04 eV; whereas synthetic melanin has two values of activation energy: up to 311 degrees K, 0.1 eV; above 313 degrees K, 0.78 eV. Optical gaps are: in eye melanin, 1.73 eV; in hair melanin, 1.35 eV; in banana melanin, 1.55 eV; and in synthetic melanin, 1.40 eV. The observed differences between natural melanins and the synthetic one could be explained by either the presence of protein residues in natural melanins or the influence of the isolation method on their electrical properties.
通过直流暗电导率实验和光吸收测量，获得了从牛眼、人类黑发和香蕉皮中分离出的天然黑色素的基本半导体特性。将结果与合成黑色素的结果进行了比较。天然黑色素的比电导率约为10^(-11)Ω^(-1)cm^(-1)，合成黑色素的比电导率为10^(-8)Ω^(-1)cm^(-1)。在298 - 333开尔文范围内的热活化能分别为：眼黑色素0.93电子伏特；毛发黑色素1.01电子伏特；香蕉黑色素1.04电子伏特；而合成黑色素有两个活化能值：311开尔文以下为0.1电子伏特；313开尔文以上为0.78电子伏特。光学带隙分别为：眼黑色素1.73电子伏特；毛发黑色素1.35电子伏特；香蕉黑色素1.55电子伏特；合成黑色素1.40电子伏特。天然黑色素与合成黑色素之间观察到的差异，要么可以用天然黑色素中存在蛋白质残基来解释，要么可以用分离方法对其电学性质的影响来解释。
