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Assessment methodologies for food safety: agglomerated cork stopperss
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Abstract(s)
A cortiça é uma matéria-prima nobre, cuja principal aplicação é a rolha de cortiça. O trabalho desta tese fez parte do projeto LIRACork cujo objetivo foi a introdução de rolhas de cortiça aglomerada com ligantes inócuos nos mercados europeu e americano.
Existem poucos estudos científicos com estes materiais, a sua utilização e a sua importância económica. No entanto, novos materiais que utilizam desperdícios de cortiça têm sido desenvolvidos com variadas aplicações.
Pré-polímeros de isocianato, precursores de poliuretanos, são utilizados para ligar os grânulos de cortiça, originando os aglomerados de cortiça. Para determinar e quantificar isocianatos livres foi desenvolvido um método utilizando a técnica de UPLC-PDA-Flu com pré derivatização.
A cura incompleta de isocianatos monoméricos presentes nos ligantes pode originar aminas aromáticas primárias que foram determinadas por UPLC-MS / MS.
A avaliação de contaminantes inorgânicos em rolhas de cortiça e rolhas de cortiça aglomerada, é também uma questão importante sobre a segurança alimentar. No entanto, há poucos regulação e estudos sobre esta questão. Assim, todos os passos do processo foram estudados.
Antes deste projeto não existia nenhuma entidade em Portugal, capaz de realizar análises que garantissem a segurança alimentar de cortiça aglomerada. Após esse projeto, e com o trabalho desta tese, o INSA é agora capaz de efetuar as referidas análises. Assim, não é necessário aos fabricantes de rolhas técnicas enviarem os seus produtos para analisar no exterior.
Cork is a noble raw material whose major application is the cork stopper. The work on this thesis was in large extent part of the LIRACork project. The project aim was to introduce agglomerated cork stoppers with safe binders into European and American markets. There are few scientific studies which take into account those materials, their use and their economic importance. However, new materials using cork wastes have been developed with many applications. Isocyanate prepolymers, the precursors of polyurethanes, are used to bind cork granules, originating the agglomerates. Within this thesis UPLC-PDA-Flu with pre derivatization was the developed method to identify and quantify isocyanates in adhesives, cork stoppers and agglomerated cork stoppers. Primary aromatic amines can be derived from the incomplete cure of the monomeric isocyanates present in the binders. PAA were determinate by UPLCMS/MS. The evaluation of inorganic contaminants for cork stoppers and agglomerated cork stoppers, as food contact materials, is also an important issue on food safety. Yet there is few regulation and studies on this issue. Thus, all steps of the procedure had to be studied. Before this project, there was no entity, in the domestic market, able to perform analyses that would ensure the food security of agglomerated cork. After this project, with the work of this thesis, INSA is now able to carry out these analyses. Therefore it is not necessary to manufacturers of technical cork stoppers to send their products abroad.
Cork is a noble raw material whose major application is the cork stopper. The work on this thesis was in large extent part of the LIRACork project. The project aim was to introduce agglomerated cork stoppers with safe binders into European and American markets. There are few scientific studies which take into account those materials, their use and their economic importance. However, new materials using cork wastes have been developed with many applications. Isocyanate prepolymers, the precursors of polyurethanes, are used to bind cork granules, originating the agglomerates. Within this thesis UPLC-PDA-Flu with pre derivatization was the developed method to identify and quantify isocyanates in adhesives, cork stoppers and agglomerated cork stoppers. Primary aromatic amines can be derived from the incomplete cure of the monomeric isocyanates present in the binders. PAA were determinate by UPLCMS/MS. The evaluation of inorganic contaminants for cork stoppers and agglomerated cork stoppers, as food contact materials, is also an important issue on food safety. Yet there is few regulation and studies on this issue. Thus, all steps of the procedure had to be studied. Before this project, there was no entity, in the domestic market, able to perform analyses that would ensure the food security of agglomerated cork. After this project, with the work of this thesis, INSA is now able to carry out these analyses. Therefore it is not necessary to manufacturers of technical cork stoppers to send their products abroad.
Description
Tese de doutoramento em Engenharia Quimica, apresentada ao Instiuto Superior Técnico da Universiade de Lisboa, 2017.
Tese defendida a 7 de abril de 2017.
Coorientadora Isabel Castanheira, Departamento de Alimentação do INSA.
Tese defendida a 7 de abril de 2017.
Coorientadora Isabel Castanheira, Departamento de Alimentação do INSA.
Keywords
Rolha de Cortiça Segurança Alimentar Isocianato Aminas Primárias Aromáticas Contaminantes Inorgânicos UPLC-MS/MS UPLC-PDA-Flu ICP Saúde Pública Cork Stopper Food Safety Isocyanate Primary Aromatic Amine Inorganic Contaminants