Modified graphene-silica as a sorbent for in-tube solid-phase microextraction coupled to liquid chromatography-tandem mass spectrometry. Determination of xanthines in coffee beverages

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Funding Information
  • Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (307293/2014-9)
  • Fundação de Amparo à Pesquisa do Estado de São Paulo (2014/07347-9, 2015/15462-5, 2017/02147-0)

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