Caracterização de fenóis no bio-óleo da pirólise de caroço de pêssego por GC/MS e GC×GC/TOFMS

Migliorini, Marcelo Vieira; Moraes, Marina Silvana A.; Machado, Maria Elisabete; Caramão, Elina Bastos

Palavras-chave: Caroços de pêssego, pirólise, cromatografia gasosa monodimensional, cromatografia gasosa bidimensional abrangente.

Resumo:  Neste trabalho analisou-se o bio-óleo produzido pela pirólise de caroços de pêssego usando 1D-GC/qMS (cromatografia gasosa monodimensional acoplada a espectrometria de massa quadrupolar) e GC×GC/ TOFMS (cromatografia gasosa bidimensional abrangente acoplada a espectrometria de massa por tempo de voo). Por 1D-GC/qMS foram identificados tentativamente 51 compostos e, por CG×GC/TOFMS, 207 compostos. As classes identificadas em ambas as técnicas foram alcoóis, aldeídos, anidridos, cetonas, ésteres, éteres e fenóis. Entretanto, as classes de ácidos carboxílicos, hidrocarbonetos e derivados de açúcar foram identificadas apenas na CG×GC/TOFMS, que se mostrou a técnica mais eficiente para esse tipo de análise. Os fenóis foram os compostos majoritários, tendo-se obtido uma distribuição estruturada no espaço bidimensional, o que facilitou a separação/identificação de pelo menos três subclasses de fenóis: alquil monofenóis, alquil metóxi fenóis e alquil benzenodióis. A caracterização mostrou que o bio-óleo pode ser uma fonte potencial de matéria-prima para a indústria química.

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