Freeze-dried jaboticaba peel powder improves insulin sensitivity in high-fat-fed mice

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)The peel of the native Brazilian fruit jaboticaba is rich in anthocyanins, which are known for their anti-obesity effects in animal models. The aim of the present study was to evaluate the effects of freeze-dried jaboticaba peel powder (FDJPP) on a number of metabolic parameters in a model of diet-induced obesity. Mice (n 8 per group) were initially fed on a high-fat diet (HFD, 35% w/w) for 4 weeks and then switched to a HFD supplemented with FDJPP (1, 2 or 4% w/w) for an additional 6 weeks. Energy intake, weight loss, glucose tolerance, insulin resistance and lipid profile were determined, and the results were evaluated using ANOVA and Tukey's tests. The FDJPP exerted no protective effect on HFD-induced weight gain, hyperleptinaemia and glucose intolerance. However, the supplementation was effective to reduce insulin resistance, as evidenced in the insulin tolerance test, and subsequently confirmed by improved signal transduction through the insulin receptor/insulin receptor substrate-1/Akt/forkhead box protein pathway and by the attenuation of HFD-induced inflammation in the liver, verified by lower expressions of IL-1 beta and IL-6 and decreased phosphorylated I kappa B-alpha protein levels in all jaboticaba-treated mice. These results suggest that FDJPP may exert a protective role against obesity-associated insulin resistance.o TEXTO COMPLETO DESTE ARTIGO, ESTARÁ DISPONÍVEL À PARTIR DE AGOSTO DE 2015.1103447455Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Jaboticaba peel: Antioxidant compounds, antiproliferative and antimutagenic activities

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)This paper reports on the anthocyanin and antioxidant contents, an the 'in vitro' antiproliferative and 'in vivo' mutagenic/antimutagenic activities of freeze-dried jaboticaba peel (JP). According to the proximate composition, JP showed a high dietary fiber content. The identification and quantification of the JP anthocyanins was carried out by HPLC-PDA and LC-MS/MS, which revealed the presence of two compounds: delphinidin 3-glucoside and cyanidin 3-glucoside (634.75 and 1963.57 mg 100 g(-1) d. w., respectively). JP showed a strong antioxidant potential: 25,514.24+/-3037 mu M TE g(-1), 45.38+/-0.50 mu g mL(-1) and 9458+/-97 mu M TEAC g(-1), for ORAC, DPPH and ABTS, respectively. The polar JP extract demonstrated antiproliferative effects against leukemia (K-562), and the non-polar extract was the most active against prostate cancer cell (PC-3), according to the antiproliferative assay. The micronucleus test in mice demonstrated that the polar JP extract induced no DNA damage and hence it showed no cytotoxic properties on mice bone marrow cells and caused no mutagenic effects. (C) 2012 Elsevier Ltd. All rights reserved.491596603Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)FINEPConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP