Magnetic properties of synthetic eumelanin - Preliminary results

被引：10

作者：

Cano, M. E. ^{[1
]}

Castaneda-Priego, R. ^{[2
]}

Gil-Villegas, A. ^{[2
]}

Sosa, M. A. ^{[2
]}

Schio, P. ^{[3
]}

de Oliveira, A. J. A. ^{[3
]}

Chen, F. ^{[4
]}

Baffa, O. ^{[4
]}

Graeff, C. F. O. ^{[5
]}

机构：

[1] Univ Guadalajara, Ctr Univ Cienega, Ocotlan, Jalisco, Mexico

[2] Univ Guanajuato, Inst Fis, Guanajuato, Mexico

[3] Univ Fed Sao Carlos, Dept Fis, BR-13560 Sao Carlos, Brazil

[4] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Ribeirao Preto, Brazil

[5] Univ Estadual Paulista, FC, Dept Fis, Bauru, Brazil

来源：

PHOTOCHEMISTRY AND PHOTOBIOLOGY | 2008年 / 84卷 / 03期

关键词：

D O I：

10.1111/j.1751-1097.2008.00302.x

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

We report an experimental and theoretical study of magnetic properties of synthetic eumelanin. The magnetization curves are determined by using both a vibrating sample magnetometer and a superconducting quantum interferometer device in an extended range of magnetic fields ranging from -10 kOe to 10 kOe at different temperatures. We find that the eumelanin magnetization can be qualitatively explained in terms of a simple model of dipolar spheres with an intrinsic magnetic moment. The latter one is experimentally measured by using X-band electron paramagnetic resonance. Our findings indicate that synthetic melanins are superparamagnetic.

引用

页码：627 / 631

页数：5

共 27 条

[1] EPR investigations of the iron domain in neuromelanin [J].

Aime, S ;

Bergamasco, B ;

Biglino, D ;

Digilio, G ;

Fasano, M ;

Giamello, E ;

Lopiano, L .

BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR BASIS OF DISEASE, 1997, 1361 (01) :49-58

[2]

ALLEN MP, 1989, COMPUTER SIMULATION, P110

[3] EDDY-CURRENT METHOD FOR MEASURING THE RESISTIVITY OF METALS [J].

BEAN, CP ;

DEBLOIS, RW ;

NESBITT, LB .

JOURNAL OF APPLIED PHYSICS, 1959, 30 (12) :1976-1980

[4] Filling factor of a paramagnetic sample in a rectangular cavity: theory and application [J].

Blank, A ;

Levanon, H .

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 2000, 56 (02) :363-371

[5]

BOLZONI F, 2002, BIOCHIM BIOPHYS ACTA, V1856, P210

[6] Computer simulation of magnetic properties of human blood [J].

Cano, Mario E. ;

Gil-Villegas, Alejandro ;

Sosa, Modesto A. ;

Villagomez, Julio C. ;

Baffa, Oswaldo .

CHEMICAL PHYSICS LETTERS, 2006, 432 (4-6) :548-552

[7] A hierarchical self-assembly of eumelanin [J].

Clancy, CMR ;

Nofsinger, JB ;

Hanks, RK ;

Simon, JD .

JOURNAL OF PHYSICAL CHEMISTRY B, 2000, 104 (33) :7871-7873

[8] Synthetic melanin thin films:: Structural and electrical properties [J].

da Silva, MIN ;

Dezidério, SN ;

Gonzalez, JC ;

Graeff, CFO ;

Cotta, MA .

JOURNAL OF APPLIED PHYSICS, 2004, 96 (10) :5803-5807

[9]

DEZIDERIO SN, 2004, J NONCRYST SOLIDS, V634, P338

[10] Neuromelanin in human dopamine neurons: Comparison with peripheral melanins and relevance to Parkinson's disease [J].

Fedorow, H ;

Tribl, F ;

Halliday, G ;

Gerlach, A ;

Riederer, P ;

Double, KL .

PROGRESS IN NEUROBIOLOGY, 2005, 75 (02) :109-124

← 1 2 3 →