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Master's Dissertation
DOI
https://doi.org/10.11606/D.75.2016.tde-29062016-104007
Document
Author
Full name
Amanda Quatrocchio Liporini
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2016
Supervisor
Committee
Lanças, Fernando Mauro (President)
Gomes, Paulo Clairmont Feitosa de Lima
Vieira, Eny Maria
Title in Portuguese
Avaliação de diferentes técnicas de preparo de amostras e perspectiva de síntese de um polímero seletivo para a concentração de N-nitrosodietanolamina (NDELA) em matrizes cosméticas
Keywords in Portuguese
matrizes cosméticas
N-nitrosodietanolamina (NDELA)
polímero molecularmente impresso (MIP)
Abstract in Portuguese
A ocorrência de N-nitrosaminas em produtos cosméticos e de higiene pessoal está relacionada com os ingredientes utilizados na formulação de tais artefatos. A N-nitrosodietanolamina (NDELA) é formada na presença da dietanolamina associada a outros componentes, tais como íons nitrito empregados como conservantes em matrizes cosméticas. São cancerígenas e, portanto, as condições em que tais itens de consumo são fabricados é um fator que deve ser mensurado. Assim, é aconselhável a realização de estudos que mostrem a ocorrência de NDELA em cosméticos, seus principais métodos de determinação, bem como os aspectos legais que indicam os níveis de concentração deste contaminante presente em diversas formulações. Foi avaliado neste trabalho o potencial de algumas técnicas de preparo de amostras na concentração de NDELA, tais como microextração líquido-líquido dispersiva em fase reversa (DLLME-RP), extração líquido-líquido com salting out e clean up no modo on-line. Os resultados obtidos foram confrontados com os dados presentes na literatura. Adicionalmente, utilizando os conceitos de polimerização via sol-gel e via precipitação para a síntese de polímeros molecularmente impressos (MIP), propõem-se uma possível rota sintética para a confecção de materiais seletivos para a pré-concentração da nitrosamina.
Title in English
Evaluation of different sample preparation techniques and perspective synthesis of selective polymer for N-nitrosodiethanolamine (NDELA) in personal care products
Keywords in English
cosmetic products
molecularly imprinted polymer (MIP)
N-nitrosodiethanolamine (NDELA)
Abstract in English
The occurrence of N-nitrosamines in cosmetic and personal hygiene are related to the ingredients used in the formulation of such artefacts. N-nitrosodiethanolamine (NDELA) is formed in the presence of diethanolamine associated with other components such as nitrite ions employed as preservatives in cosmetic matrices. They are carcinogenic and, therefore, the conditions under which such consumer items are produced is a factor that must be measured. It is therefore advisable to carry out studies that show the occurrence of NDELA in cosmetics, their main methods of determination as well as the legal aspects that indicate the levels of concentration of this contaminant present in various formulations. It was evaluated in this study the potential for some sample preparation techniques in the concentration of NDELA such as liquid-liquid microextraction dispersive reverse phase (DLLME-RP) liquid-liquid extraction with salting out and clean up online. The results were compared with data in the literature. Additionally, using the concepts of polymerization via sol-gel and precipitation route for the synthesis of molecularly imprinted polymers (MIP) are proposed as a possible synthetic route for the preparation of materials for selective pre-concentration of nitrosamine.
 
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Publishing Date
2016-08-30
 
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