Impacts of microwaves on the pectin extraction from apple pomace: Technological properties in structuring of hydrogels

Autor(es)

Costa, Josiel Martins ; Wang, Wenli ; Nakasu, Pedro Y. S. ; Hu, Changwei ; Forster-Carneiro, Tania ; Hallett, Jason P.

• Tipo de documento: Artigo Científico
• Fonte: FOOD HYDROCOLLOIDS; v. 160, p. 12-pg., 2024-10-24.

Resumo

The valorization of by-products eliminates the risks of economic barriers and reduces the overall amount of pollution and the carbon footprint of the products. In this context, conventional heating extraction (CE) and microwave-assisted extraction (MAE) were compared to extract pectin from apple pomace. The effects of temperature on MAE were evaluated based on the resulting properties obtained in subsequent pectin hydrogels. A pectin yield of 10.6 +/- 0.3% was obtained by MAE with 5 min extraction, while CE showed a yield of 9.5 +/- 0.3% after 2 h. The pectin extracted by both methods had a low methoxyl content, indicating a low degree of esterification. The galacturonic acid content was greater than 60% for most samples. Zeta potential analysis indicated the ability of the pectin to form stable gels. According to the X-ray diffractograms, increasing the extraction temperature led to a decrease in the crystallinity of the pectin structure. Rheological tests showed increased storage modulus as the temperature increased by MAE from 80 to 100 degrees C for the pectin-based hydrogel. The water holding capacity was greater than 50% for all hydrogels. Furthermore, an analysis of electrical consumption and energy costs highlighted the economic advantage of using microwave heating technology to extract pectin. (AU)

• Processo FAPESP: 23/01685-9 - Líquidos iônicos biocompatíveis para recuperação de subprodutos de alto valor agregado do bagaço de maçã (Malus domestica)
• Beneficiário: Josiel Martins Costa
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 18/14938-4 - Waste2energy: integração das tecnologias supercrítica e digestão anaeróbia através de um sistema automatizado para produção de precursores de biocombustíveis
• Beneficiário: Tânia Forster Carneiro
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores - Fase 2