title: Surface interactions of gold nanorods and polysaccharides: From clusters to individual nanoparticles.
abstract: Gold nanorods (AuNRs) are suitable for constructing self-assembled structures for the development of biosensing devices and are usually obtained in the presence of cetyltrimethylammonium bromide (CTAB). Here, a sulfated chitosan (ChiS) and gum arabic (GA) were employed to encapsulate CTAB/AuNRs with the purpose of studying the interactions of the polysaccharides with CTAB, which is cytotoxic and is responsible for the instability of nanoparticles in buffer solutions. The presence of a variety of functional groups such as the sulfate groups in ChiS and the carboxylic groups in GA, led to efficient interactions with CTAB/AuNRs as evidenced through UV-vis and FTIR spectroscopies. Electron microscopies (HR-SEM and TEM) revealed that nanoparticle clusters were formed in the GA-AuNRs sample, whereas individual AuNRs, surrounded by a dense layer of polysaccharides, were observed in the ChiS-AuNRs sample. Therefore, the presented work contributes to the understanding of the driving forces that control the surface interactions of the studied materials, providing useful information in the building-up of gold self-assembled nanostructures.
authors: Grupo de Pesquisa em Macromoléculas e Interfaces, Departamento de Química, Universidade Federal do Paraná-UFPR, CxP 19081, CEP 81531-980, Curitiba, PR, Brazil.
authors: Heloise Ribeiro
authors: HR
authors: de Barros
authors: Grupo de Pesquisa em Macromoléculas e Interfaces, Departamento de Química, Universidade Federal do Paraná-UFPR, CxP 19081, CEP 81531-980, Curitiba, PR, Brazil.
authors: Leandro
authors: L
authors: Piovan
authors: Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná-UFPR, CxP 19046, CEP 81531-980, Curitiba, PR, Brazil.
authors: Guilherme L
authors: GL
authors: Sassaki
authors: Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná-UFPR, CxP 19046, CEP 81531-980, Curitiba, PR, Brazil.
authors: Diego
authors: D
authors: de Araujo Sabry
authors: Departamento de Física, Universidade Federal do Paraná-UFPR, CxP 19044, CEP 81531-980, Curitiba, PR, Brazil.
authors: Ney
authors: N
authors: Mattoso
authors: Grupo de Catálise e Reatividade Química, Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, Av. Lourival de Melo Mota s/n, CEP 57072-970, Maceió, AL, Brazil.
authors: Ábner Magalhães
authors: ÁM
authors: Nunes
authors: Grupo de Catálise e Reatividade Química, Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, Av. Lourival de Melo Mota s/n, CEP 57072-970, Maceió, AL, Brazil.
authors: Mario R
authors: MR
authors: Meneghetti
authors: Grupo de Pesquisa em Macromoléculas e Interfaces, Departamento de Química, Universidade Federal do Paraná-UFPR, CxP 19081, CEP 81531-980, Curitiba, PR, Brazil. Electronic address: izabel.riegel@ufpr.br.
authors: Izabel C
authors: IC
authors: Riegel-Vidotti
mesh_terms: D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D006170:Gum Arabic / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D002593:Cetrimonium Compounds; D006046:Gold; D006170:Gum Arabic; D048271:Chitosan; D000077286:Cetrimonium
keywords: Gold nanorods; Self-assembling; Sulfated chitosan; Surface interactions