Desenvolvimento tecnologico da extração da sericina e preparação de nanoparticulas para aplicação em cosmeticos / Technological development of sericin extraction and preparation of nanoparticles for cosmetic application

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

This work presents the development of sericin nanoparticles applied to the cosmetic treatment of hair. The nanoparticles were obtained from sericin solutions, previously extracted from cocoons or silk yarn, and formed through electrostatic complexation with guar gum. The surface of the nanoparticles was modified through the incorporation of cationic surfactant agents, in order to obtain positive charge density, suitable for the adsorption on the hair surface. The production process involved the steps of sericin extraction from the cocoons or silk yarn, complexation and modification of the nanoparticles surface. The extraction was performed in autoclave and atmospheric pressure, using water or an aqueous solution of sodium carbonate as solvents. During the complexation was studied the effect of different concentrations of guar gum, as well as how to add this agent, which was made in powder and in an aqueous solution. The surface modification of particles was made with the cationic surfactant cetiltrimetil ammonium chloride (CTAC) and behenyltrimetil ammonium chloride (BTAC), alone and in combination with different proportions. The incorporation of cationic surfactant was made in the presence of electrolytes, resulting from the extraction, or after separation of the nanoparticles by precipitation with ethanol and resuspended in water later. The effects were analyzed in terms of efficiency of processes, nanoparticle size and zeta potential. The poliquaternium 7, a quaternary ammonium derivative, was added to the nanoparticles suspension as a viscosity agent. The results show the feasibility of output of sericin nanoparticles with promising sensory properties for the conditioning of damaged hair. The production process is simple, scalable and easy to transfer to the industrial sector

ASSUNTO(S)

nanoparticles nanoparticulas extração quimica extraction (chemistry)

ACESSO AO ARTIGO

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