-Grape by-products are promising and sustainable sources of anthocyanins. Considering the factors related to degradation of those pigments, spectrophotometric and kinetic analyzes were carried out with the aim to evaluate the light and heat stability of anthocyanins from Isabel grape residue. We found that the exposure to luminosity (80W; 2500 lux) and high temperature (≥ 70ºC) significantly affected the absorption and content of those compounds (p <0.05), whose the most stable condition was obtained at 50°C (t 1/2 : 37.7h; k: 1.84 x 10 -2 h -1 ) and protected from light (t 1/2 : 3,320.6h; k: 2.09 x 10 -4 h -1 ). Therefore, the anthocyanins from the agroindustrial residue of Isabel grape are an alternative of natural colorants for food that can be packaged in opaque packaging and not subjected to severe heat treatment during processing. Index Terms: Vitis labrusca; Kinetics; Thermal degradation; Light. ESTABILIDADE DE ANTOCIANINAS DO RESÍDUO AGROINDUSTRIALDA UVA ISABEL CULTIVADA NO VALE DO SÃO FRANCISCO RESUMO -Subprodutos da uva são fontes promissoras e sustentáveis de antocianinas. Considerando os fatores envolvidos no processo de degradação desses pigmentos, análises espectrofotométricas e cinéticas foram realizadas com o objetivo de avaliar a estabilidade à luz e ao calor de antocianinas do resíduo da uva cv. Isabel. Constatou-se que a exposição à luminosidade (80 W; 2500/lux) e à temperatura elevada (≥ 70ºC) afetou significativamente a absorbância e o teor desses compostos (p <0,05), cuja condição mais estável foi obtida a 50ºC (t 1/2 : 37,7 h; k: 1,84 x 10 -2 h -1 ) e protegida da luz (t 1/2 : 3.320,6 h; k: 2,09 x 10 -4 h -1 ). Portanto, as antocianinas extraídas do resíduo da uva Isabel são uma alternativa de corante natural para produtos alimentícios que sejam acondicionados em embalagens opacas e não sejam submetidos a tratamentos térmicos severos durante o processamento. Termos para Indexação: Vitis labrusca, Cinética, Degradação térmica, Luz.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.