| Grant number: | 10/00383-9 |
| Support type: | Scholarships in Brazil - Doctorate (Direct) |
| Effective date (Start): | April 01, 2010 |
| Effective date (End): | March 09, 2014 |
| Field of knowledge: | Physical Sciences and Mathematics - Chemistry - Physical-Chemistry |
| Principal Investigator: | Frank Herbert Quina |
| Grantee: | Bárbara Held |
| Home 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) | |