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| Author(s): |
Yara Severino de Queiroz
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Saúde Pública (FSP/CIR) |
| Defense date: | 2006-08-21 |
| Examining board members: |
Elizabeth Aparecida Ferraz da Silva Torres;
Deborah Helena Markowicz Bastos;
Inar Alves de Castro
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| Advisor: | Elizabeth Aparecida Ferraz da Silva Torres |
| Abstract | |
Objective. The interest for ready-to-eat garlic byproducts increased in the last decade. Garlic has phenolic and sulfur compounds, which are responsible for the singular flavor and antioxidant activity. This study aimed to evaluate the antioxidant activity (AA) of in natura garlic and its commercialized byproducts, and to correlate the data with phenolics contents. The impact of additives (citric acid, sodium metabisulfite and sodium benzoate) on the AA was also evaluated. Methodology. Methanolic extracts of in natura garlic (ING) and its products, i.e., chopped with salt (CWP), chopped without salt (CS), fried (FG) and mixed garlic - in natura garlic with dehydrated garlic (MG) were evaluated in three different moments of the shelf life. This evaluation based on the measurement of the following parameters: total phenolic compounds and AA. The AA were evaluated using three different methods: DPPH (1,1- diphenyl-2-picrylhydrazyl) assay, β-carotene/linoleic acid system and Rancimat® method. Results. The total phenolics content of the extract in relation to the dried residue was higher in the fried product, in the three moments. Regarding the AA, fried garlic showed the best activity in all tests. Throughout the shelf life, the AA decreased with the DPPH assays. In contrast, when the other tests were applied, the AA increased. The products with additives showed better antioxidant activity when compared to those without the additives, although the samples with additives showed lower content of total phenolics. Conclusion. This study strengthened the antioxidant potential of garlic, therefore its consumption should be recommended as part of a healthy diet. Moreover, it was observed that the presence of additives improved the antioxidant effect of the samples. (AU) | |