Microextração líquido-líquido dispersiva (DLLME): fundamentos e aplicações

Martins, Manoel Leonardo; Primel, Ednei Gilberto; Caldas, Sergiane Souza; Prestes, Osmar Damian; Adaime, Martha Bohrer; Zanella, Renato

Palavras-chave: Preparo de amostra, extração miniaturizada, compostos orgânicos, cromatografia.

Resumo: Nos últimos anos, as técnicas clássicas de preparo de amostra para a determinação de compostos orgânicos em amostras ambientais e alimentos estão sendo substituídas por técnicas miniaturizadas que são caracterizadas pelo baixo custo, alta eficiência, reduzida quantidade de solvente, além da possibilidade de automação. Dentre essas técnicas, a Microextraçao Líquido-Líquido Dispersiva (DLLME) apresenta-se como uma interessante alternativa para o preparo de amostra e está baseada na partição dos analitos de interesse empregando-se pequenos volumes de uma mistura de solventes (dispersor e extrator). A DLLME apresenta como principais vantagens a miniaturização, baixo custo, rapidez, alta eficiência de extração e pré-concentração, bem como potencial para aplicação direta em campo. Esta revisão apresenta fundamentos e aplicações da DLLME na determinação de compostos orgânicos em diferentes tipos de amostras.

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