Investigation of the pH effect and UV radiation on kinetic degradation of anthocyanin mixtures extracted from Hibiscus acetosella

Autor(es)

Marco, Paulo Henrique ^[1] ; Poppi, Ronei Jesus ^[1] ; Scarminio, Ieda Spacino ^[2] ; Tauler, Roma ^[3]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Inst Chem, BR-13083970 Campinas, SP - Brazil

^[2] Univ Londrina, Dept Chem, BR-86051970 Londrina, PR - Brazil

^[3] IDAEA CSIC, Inst Environm Diagnost & Water Studies, Dept Environm Chem, Barcelona 08034 - Spain

• Tipo de documento: Artigo Científico
• Fonte: Food Chemistry; v. 125, n. 3, p. 1020-1027, APR 1 2011.
• Citações Web of Science: 33

Resumo

The major anthocyanin pigments extracted from Hibiscus acetosella flower were investigated by UV-Vis spectroscopy and multivariate curve resolution-alternating least squares (MCR-ALS). Pure spectra and kinetic of the species present at different pH values were recovered for anthocyanins transformation and degradation products, found with and without UV radiation exposure. In the absence of UV radiation, up to seven different species were detected and by UV radiation exposure, this number increased to up to nine. The species detected in the absence of radiation were also detected when pigments samples were exposed to UV radiation, where degradation occurred faster and two new species appear. The kinetic profiles obtained at different pH values allowed the proposal of a reaction mechanism and pathway. (C) 2010 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 04/09231-6 - Estudo da influência da radiação e pH no comportamento cinético de antocianinas de plantas do gênero Hibiscus por métodos quimiométricos
• Beneficiário: Paulo Henrique Março
• Modalidade de apoio: Bolsas no Brasil - Doutorado