Effect of banana pulp flour and banana skin flour and Kefir upon the glucemic and lipidemic levels of rats / Efeito das farinhas da polpa e de casca de banana e do fermentado de quefir nos nÃveis glicÃmicos e lipidÃmicos de ratos

AUTOR(ES)

Michel Cardoso de Angelis Pereira

DATA DE PUBLICAÇÃO

2007

RESUMO

Non-transmissible chronic diseases have been more and more related to feeding. Seeking to increase the scientific evidence on the beneficial effect of kefir and of banana pulp and skin flour, this work intended to study those food complements to evaluate the possible reduction of post-prandial reduction and of serum lipids in experimental animals. Analyses of the centesimal composition of the flours were undertaken following the methods proposed by the AOAC (1990), namely, five replicates for each analysis of prata banana pulp and skin flours. For the evaluation of the effect of kefir and of banana flours on the serum lipids, ponderal development, food consumption and food efficacy coefficient, 35 Wistar albinic, male rats, weighing initially 80g (n= 7/group), were given at first a hyper cholesterolemic diet for 21 days and afterwards, they were treated for further 21 days on banana flour, kefir and banana flour +kefir. The flours were given in the concentrations of 1% of skin and 7% of pulp and kefir in the concentration of 1.5ml/animal. For the post- prandial glucemic analyses, 30 healthy albinic, male Wistar rats, weighing initially between 180g (n= 7/group), were given diets with the banana skin and pulp following the AIN-93M standards, causing detriment to starch, the groups being: control, 7%, 10% and 15% of pulp flour and 10% of banana skin flour. The analysis of capilar glucemia was performed in fasting animals and after consumption of the different diets for 15 days. The blood puncture was verified in the tail of the animals by utilizing both apparatuses and tapes Accu-ChekÂ. The statistical analyses were proceeded by the Tukey method, the values of p<0.05 being significant differences. Banana pulp flour presented marked concentrations of food fiber (3.77%), the concentration of fiber of banana skin flour (18.11%) being still much more expressive. The values of moisture, ether extract, protein, nitrogen-free extract and ashes were found for both pulp and skin in the percentages of 9.92 and 5.07%, 0.38 and 10.67%, 4.76 and 8.12%, 78.84 and 46.95%, 2.32 and 11.09% respectively. The different treatments did not influence the ponderal development, food consumption and food efficacy coefficient of the animals. In the utilized concentrations, banana flour did not influence the plasma lipids. Kefir reduced the plasma levels of VLDL-c and triacylglycerols and raised the HDL-c levels, which reinforces their beneficial effects in preventing cardiovascular diseases. In the treatments with the flours to verify the glucemic response, all the treatments showed lower glucemia as compared with that of the control group, nevertheless, it was not significant at the level of p<0.05. It follows that Kefir presents properties of aid in the prevention of cardiac-coronarian diseases and banana flour is an excellent source of fibers, not interfering on the post-prandial glucemia, which may be viable for the dietary planning of athletes and controlled non-glucemic persons.

ASSUNTO(S)

ciencia de alimentos

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