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Avaliação das chalconas no processo oxidativo do biodiesel

Avaliação das chalconas no processo oxidativo do biodiesel

Caroline Rockembach / Claudio Pereira / Daiane Dias

53,60 €
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Editorial:
KS OmniScriptum Publishing
Año de edición:
2025
Materia
Química
ISBN:
9786209401282
53,60 €
IVA incluido
Disponible

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Sobre IBD

A ideia principal deste estudo é avaliar diferentes chalconas como antioxidantes para o biodiesel de girassol. A transesterificação do óleo de girassol foi realizada por catálise básica assistida por ultrassom, obtendo-se uma conversão de 98,5 %. Os parâmetros físico-químicos (viscosidade, valores de acidez, iodo e saponificação) foram avaliados para determinar a qualidade do biodiesel. O perfil de ácidos gordos foi determinado por cromatografia gasosa com deteção por ionização de chama (GC-FID). Onze chalconas com diferentes substituintes foram sintetizadas, caracterizadas por infravermelho por transformada de Fourier (FT-IR) e cromatografia gasosa acoplada à espectrometria de massa (GC-MS), e as suas purezas foram determinadas por GC-MS e ponto de fusão. A avaliação da atividade antioxidante destas chalconas foi realizada utilizando os métodos DPPH e quimioluminescência. As chalconas que apresentaram a maior atividade antioxidante em testes in vitro foram adicionadas ao biodiesel, cuja estabilidade oxidativa foi medida em Rancimat.

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