7
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Efeito do cozimento sobre alguns fatores antinutricionais em folhas de brócoli, couve- flor e couve Translated title: Effect of boiling on contents of antinutritional factors in leaves of broccoli, cauliflower and cabbage

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Os resíduos vegetais desprezados pela indústria e durante o preparo dos alimentos poderiam ser utilizados como fontes alternativas de nutrientes contribuindo para o enriquecimento da dieta das populações carentes. Por outro lado, muitos alimentos vegetais são fontes de fatores antinutricionais que interferem na digestão ou absorção de nutrientes. Determinou-se os teores de polifenóis, nitrato e ácido oxálico de folhas de brócoli, couve-flor e couve submetidas à cocção por seis diferentes tempos (0, 2, 4, 6, 8 e 10 minutos). Verificou-se queda nos teores de fatores antinutricionais com o aumento do tempo de cozimento, mostrando-se aceitáveis para o consumo. No entanto, os tratamentos utilizados não foram suficientes para reduzir os teores de polifenóis das folhas de brócoli e couve a valores considerados adequados ao consumo humano, sugerindo a utilização conjunta de outra metodologia para a redução dos polifenóis presentes nesses vegetais.

          Translated abstract

          The vegetable residues despised from the industry and during the food preparation might be used as an alternative nutrient source that provides poor people a richer diet. Otherwise, many vegetables are source of antinutritional factors that might influence in the digest or in the nutrients absorption. As the purpose to determining the contents of poliphenols, oxalic acid and nitrate in leaves of broccoli, cauliflower and cabbage, they were submitted to cooking in six different times (0, 2, 4, 6, 8 and 10 minutes). The results showed that the antinutritional factors dropped with the increase of the cooking time, being acceptable for the consumption. However, the treatments were not enought to decrease the contents of poliphenols in leaves of broccoli and cabbage considering values to the human consumption. Thus, it had better to use another methodology to decrease the level of polyphenols in the vegetables.

          Related collections

          Most cited references29

          • Record: found
          • Abstract: found
          • Article: not found

          Tannins and human health: a review.

          Tannins (commonly referred to as tannic acid) are water-soluble polyphenols that are present in many plant foods. They have been reported to be responsible for decreases in feed intake, growth rate, feed efficiency, net metabolizable energy, and protein digestibility in experimental animals. Therefore, foods rich in tannins are considered to be of low nutritional value. However, recent findings indicate that the major effect of tannins was not due to their inhibition on food consumption or digestion but rather the decreased efficiency in converting the absorbed nutrients to new body substances. Incidences of certain cancers, such as esophageal cancer, have been reported to be related to consumption of tannins-rich foods such as betel nuts and herbal teas, suggesting that tannins might be carcinogenic. However, other reports indicated that the carcinogenic activity of tannins might be related to components associated with tannins rather than tannins themselves. Interestingly, many reports indicated negative association between tea consumption and incidences of cancers. Tea polyphenols and many tannin components were suggested to be anticarcinogenic. Many tannin molecules have also been shown to reduce the mutagenic activity of a number of mutagens. Many carcinogens and/or mutagens produce oxygen-free radicals for interaction with cellular macromolecules. The anticarcinogenic and antimutagenic potentials of tannins may be related to their antioxidative property, which is important in protecting cellular oxidative damage, including lipid peroxidation. The generation of superoxide radicals was reported to be inhibited by tannins and related compounds. The antimicrobial activities of tannins are well documented. The growth of many fungi, yeasts, bacteria, and viruses was inhibited by tannins. We have also found that tannic acid and propyl gallate, but not gallic acid, were inhibitory to foodborne bacteria, aquatic bacteria, and off-flavor-producing microorganisms. Their antimicrobial properties seemed to be associated with the hydrolysis of ester linkage between gallic acid and polyols hydrolyzed after ripening of many edible fruits. Tannins in these fruits thus serve as a natural defense mechanism against microbial infections. The antimicrobial property of tannic acid can also be used in food processing to increase the shelf-life of certain foods, such as catfish fillets. Tannins have also been reported to exert other physiological effects, such as to accelerate blood clotting, reduce blood pressure, decrease the serum lipid level, produce liver necrosis, and modulate immunoresponses. The dosage and kind of tannins are critical to these effects. The aim of this review is to summarize and analyze the vast and sometimes conflicting literature on tannins and to provide as accurately as possible the needed information for assessment of the overall effects of tannins on human health.
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Cancer chemopreventive activity of resveratrol, a natural product derived from grapes.

            Resveratrol, a phytoalexin found in grapes and other food products, was purified and shown to have cancer chemopreventive activity in assays representing three major stages of carcinogenesis. Resveratrol was found to act as an antioxidant and antimutagen and to induce phase II drug-metabolizing enzymes (anti-initiation activity); it mediated anti-inflammatory effects and inhibited cyclooxygenase and hydroperoxidase functions (antipromotion activity); and it induced human promyelocytic leukemia cell differentiation (antiprogression activity). In addition, it inhibited the development of preneoplastic lesions in carcinogen-treated mouse mammary glands in culture and inhibited tumorigenesis in a mouse skin cancer model. These data suggest that resveratrol, a common constituent of the human diet, merits investigation as a potential cancer chemopreventive agent in humans.
              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              Resveratrol, a polyphenolic compound found in grapes and wine, is an agonist for the estrogen receptor.

              The phytochemical resveratrol, which is found in grapes and wine, has been reported to have a variety of anti-inflammatory, anti-platelet, and anti-carcinogenic effects. Based on its structural similarity to diethylstilbestrol, a synthetic estrogen, we examined whether resveratrol might be a phytoestrogen. At concentrations (approximately 3-10 microM) comparable to those required for its other biological effects, resveratrol inhibited the binding of labeled estradiol to the estrogen receptor and it activated transcription of estrogen-responsive reporter genes transfected into human breast cancer cells. This transcriptional activation was estrogen receptor-dependent, required an estrogen response element in the reporter gene, and was inhibited by specific estrogen antagonists. In some cell types (e.g., MCF-7 cells), resveratrol functioned as a superagonist (i.e., produced a greater maximal transcriptional response than estradiol) whereas in others it produced activation equal to or less than that of estradiol. Resveratrol also increased the expression of native estrogen-regulated genes, and it stimulated the proliferation of estrogen-dependent T47D breast cancer cells. We conclude that resveratrol is a phytoestrogen and that it exhibits variable degrees of estrogen receptor agonism in different test systems. The estrogenic actions of resveratrol broaden the spectrum of its biological actions and may be relevant to the reported cardiovascular benefits of drinking wine.
                Bookmark

                Author and article information

                Journal
                cagro
                Ciência e Agrotecnologia
                Ciênc. agrotec.
                Editora da Universidade Federal de Lavras (Lavras, MG, Brazil )
                1413-7054
                1981-1829
                April 2006
                : 30
                : 2
                : 294-301
                Affiliations
                [01] Lavras MG orgnameUniversidade Federal de Lavras monicas@ 123456fea.unicamp.br
                Article
                S1413-70542006000200015 S1413-7054(06)03000215
                d0191bd9-ecb2-44ae-bc08-c303d016e5ab

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 11 August 2004
                : 02 February 2005
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 32, Pages: 8
                Product

                SciELO Brazil

                Self URI: Texto completo somente em PDF (PT)
                Categories
                Ciência e Tecnologia de Alimentos

                cozimento,folhas,Fatores antinutricionais,Brassica spp,boiling,leaves,Antinutritional factors

                Comments

                Comment on this article