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Studies of the Copigmentation of compounds analogous to anthocyanins

Grant number: 10/00383-9
Support Opportunities:Scholarships in Brazil - Doctorate (Direct)
Start date: April 01, 2010
End date: March 09, 2014
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal Investigator:Frank Herbert Quina
Grantee:Bárbara Held
Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The anthocyanins are naturally occurring pigments responsible for the purple, red and blue colors of the majority of fruits and flowers. The basic chromophore of anthocyanins is a flavylium cation, typically substituted with several hydroxyl and/or methoxyl groups. In nature, the color of anthocyanins is modulated and/or stabilized by complexation with metal ions or with colorless organic molecules (a copigment). In this project, we propose a study of the interaction of model compounds analogous to anthocyanins (synthetic hydroxyflavylium ions and hydroxy/methoxyflavylium ions) with metal ions and with organic copigments, as well as a search for synergy in the ternary complexation of these anthocyanin models with both metal ions and copigments. These results will form the basis for an understanding of the anthocyanin-metal ion-copigment interactions involved in the stabilization of the color of anthocyanins in natura. (AU)

News published in Agência FAPESP Newsletter about the scholarship:
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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
HELD, BARBARA; TANG, HAO; NATARAJAN, PALANI; DA SILVA, CASSIO PACHECO; SILVA, VOLNIR DE OLIVEIRA; BOHNE, CORNELIA; QUINA, FRANK H.. Cucurbit[7]uril inclusion complexation as a supramolecular strategy for color stabilization of anthocyanin model compounds. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES, v. 15, n. 6, p. 752-757, . (10/00383-9)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
HELD, Bárbara. Studies of the copigmentation of compounds analogous to anthocyanins. 2015. Doctoral Thesis - Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ) São Paulo.