Effect of dielectric microwave heating on the color and antiradical capacity of betanin

Autor(es)

Pires Goncalves, Leticia Christina ^[1] ; Di Genova, Bruno Martorelli ^[1] ; Doerr, Felipe Augusto ^[2] ; Pinto, Ernani ^[2] ; Bastos, Erick Leite ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Santo Andre, SP - Brazil

^[2] Univ Sao Paulo, Fac Ciencias Farmaceut, Dept Anal Clin & Toxicol, Sao Paulo - Brazil

^[3] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Food Engineering; v. 118, n. 1, p. 49-55, SEP 2013.
• Citações Web of Science: 18

Resumo

The decomposition of betanin under dielectric heating (microwave irradiation, power: 25-200 W (3-24 kJ g(-1))) follows first-order kinetics with a rate constant similar to that obtained during conventional conduction heating (half-life < 2 min at 100 degrees C). Color coordinate analysis indicates that betanin is bleached upon thermal treatment, whereas beetroot juice and spray-dried beetroot powder tend to form colored decomposition products. The antiradical capacity of betanin decreases upon heating, but is still much higher than that of standard antioxidants such as ascorbic acid and trolox. Betalamic acid, a high capacity antiradical, was detected by mass spectrometry and second-derivative absorption spectroscopy in betanin samples submitted to thermal treatment. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 07/59407-1 - Betalaínas semissintéticas como antioxidantes e pigmentos biocompatíveis
• Beneficiário: Leticia Christina Pires Gonçalves
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 07/00684-6 - Síntese e aplicação de derivados de pigmentos de flores
• Beneficiário: Erick Leite Bastos
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 09/10372-7 - Uso de irradiação de microondas no acoplamento aldimínico entre ácido betalâmico e aminas/aminoácidos
• Beneficiário: Bruno Martorelli Di Genova
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica