The objective of this study was to evaluate the effect of the soaking step and the domestic processing of the common bean, on the chemical composition, the levels of phytate, tannin, starch and flatulence factors by utilizing the follows treatments: raw bean (FC), freeze-dried cooked unsoaked bean (FCSM), freeze-dried cooked bean without the non-absorved soaking water (FCSAM), freeze-dried cooked bean with the non-absorved soaking water (FCCAM) and the soaking water (AM). The beans were soaking for a period for 16 hours in the proportion 3:1 (water:beans) at room temperature. The effect of the phytates and tannins on the net protein efficiency ratio (NPR) and protein digestibility using male Wistar rats were studied. A decrease in the phytate content of the beans (85%) with use of soaking was observed. In the case of the tannin content, only the cooking of the beans promoved high decomposition (84%). In the (FCSAM) treatment a decrease in the raffinose (25.0%), stachiose (24.8%), verbascose (41.7%) and starch (26.8%) contents was observed. Diets containing casein (control), casein plus the soluble solids obtain from the soaking water showed no significant difference (p>0.05) for the NPR, as well as for the different bean treatments, although these showing lower values. The treatment (FCSM) showed the higher digestibility (74.3±5.8%) of the bean treatments, the casein diets showing 94.6±0.9%. The reduction of the phytates, tannin, starch contents and flatulence factors in the common bean was most effective when the soaking water not absorved was descarted (FCSAM).513276283Knudsen, I.M., High-performance liquid determination of oligosaccharides in leguminous seeds (1986) J Sci Food Agric, 37 (6), pp. 560-566Valenzuela, M.R.C., Sgarbieri, V.C., Influence of various dry bean fractions, cv. Carioca 80, on diet efficiency and dietary protein utilization (1990) J Nutr Sci Vitaminol, 36 (2), pp. 141-151(1996) Anuário Estatístico do Brasil, 56, pp. 3-53. , Rio de Janeiro, produção vegetalKhokhar, S., Chauhan, B.M., Antinutritional factors in moth bean (Vigna aconitifolia): Varietal differences and effects of methods of domestic processing and cooking (1986) J Food Sci, 51 (3), pp. 591-594Zhou, J.R., Erdman, J.W., Breadmaking properties of composite flours of wheat and faba beanprotein preparations (1995) Crit Rev Food Sci Nutr, 35 (6), pp. 495-508Torre, M., Rodriguez, A.R., Saura-Calixto, F., Effects of dietary fiber and phytic acid on mineral availability (1991) Crit Rev Food Sci Nutr, 1 (1), pp. 1-22Naczk, M., Nichols, T., Pink, D., Sosulski, F., Condensed tannins in canola hulls (1994) J Agric Food Chem, 42 (10), pp. 2196-2200Kaur, D., Kapoor, A.C., Nutrient composition and antinutritional factors of rice bean (Vigna umbellata) (1992) Food Chem, 43 (22), pp. 119-124Deshpande, S.S., Damodaran, S., Food legumes: Chemistry and technology (1990) Adv Cereal Sci Technol, 10, pp. 147-241Ida, E., Silva, R.S.F., Rao, C.S., Oligosaccharides of soybeans: Problems and solutions (1981) Arq Biol Technol, 24 (4), pp. 25-30Sánchez-Mata, M., Teruel-Peñuela, M., Cámara-Hurtado, M., Díez-Marqués, C., Torija-Isasa, M.E., Determination of mono-, di-, and oligosaccharides in legumes by high-performance liquid chromatography using an amino-bonded silica column (1998) J Agric Food Chem, 46 (9), pp. 3648-3652Baldini, V.L.S., Draetta, I.S., Yong, K.P., Purification and characterization of α-galactosidase from bean Phaseolus vulgaris (1985) J Food Sci, 50 (6), pp. 1766-1767Jacorzinski, B., Der einfluss einer raffinose - Diet und gekochter leguminosensamen auf einig prozesse im dickdarm der ratte (1987) Nahrung, 31 (10), pp. 971-980Goycoolea, F., Gonzalez De Mejia, E., Barron, J.M., Valencia, M.E., Efecto de los tratamientos caseros en la preparacion de frijol pinto (Phaseolus vulgaris, L) sobre o contenido de taninos y valor nutritivo de las proteinas (1990) Arch Latinoamer Nutr, 40 (2), pp. 263-274Bressani, R., Navarrete, D.A., Garcia Soto, A., Elias, L.G., Culinary practices and consumption characteristics of common beans at the rural home level (1988) Arch Latinoamer Nutr, 38 (4), pp. 925-934Castellanos, J.Z., Maldonado, H.G., Jimenéz, A., Mejía, C., Ramos, J.J.M., Gallegos, J.A.A., Hoyos, G., Cáceres, B., Hábitos preferenciales de los consumidores de frijol común (Phaseolus vulgaris, L.) en México (1997) Arch Latinoamer Nutr, 47 (2), pp. 163-167Barampama, Z., Simard, R.E., Oligosaccharides, antinutritional factors and protein digestibility of dry beans as affected by processing (1994) J Food Sci, 59 (4), pp. 833-838Barampama, Z., Simard, R.E., Effects of soaking, cooking and fermentation on composition, in-vitro starch digestibility and nutritive value of common beans (1995) Plant Foods Hum Nutr, 48 (4), pp. 349-365Bligh, E.G., Dyer, W.J., A rapid method of total lipid extraction an purification (1959) Can J Biochemphisiol, 37 (8), pp. 911-917Horwitz, W., (1975) Official Methods of Analysis. 12. Ed., pp. 927-928. , Washington D.C.: AOACWilliams, P.C., The use of titanium dioxide as a catalyst from large scale Kjeldahl determination of the total nitrogen content of cereal grains (1973) J Sci Food Agric, 24 (6), pp. 343-348Mossé, J., Nitrogen to protein conversion factor for ten cereals and six legumes or oilseedsa reappraisal of its definition and determination. Variation according to species and to seeds protein content (1990) J Agric Food Chem, 38 (1), pp. 18-24Pearson, D., (1976) Técnicas de Laboratorio Para el Análisis de Alimentos [Laboratory Techiques in Food Analysis], , Zagaroga: AcribiaLees, R., (1979) Manual de Análisis de Alimentos, , Zaragoza: Acribia(1987) Manual Técnico de Análises, , Campinas: ITALCunnif, P., (1995) Official Methods of Analysis. 16. Ed., , Washington D.C.: AOACLatta, M., Eskin, M., A simple and rapid colorimetric method for phytate determination (1980) J Agric Food Chem., 28 (6), pp. 1313-1315Deshpande, S.S., Cheryan, M., Salunke, D.K., Tannin analysis of food products (1986) Crit Rev Food Sci Nutr, 24 (4), pp. 401-449Bergeret, G., Curso de industrias agrícolas: Técnica analítica (1937) Revista AGROS, 7 (129), p. 99Horwitz, W., (1970) Official Methods of Analysis. 11.ed., , Washington D.C.: AOACVidal-Valverde, C., Frias, J., Valverde, S., Changes in the carbohydrate composition of legumes after soaking and cooking (1993) J Am Diet Assoc, 93 (5), pp. 547-550Assumpção, R.M.V., Morita, T., (1968) Manual de Soluções, Reagentes e Solventes: Padronização, Preparação e Purificação, , São Paulo: Edgard BlucherCarvalho, P.R.N., (1993) Cromatografia Líquida de Alta Eficiência Aplicada à Análise de Alimentos: Manual Técnico, , Campinas: ITALFrias, J., Hedley, C.L., Price, K.R., Fenwick, G.R., Vidal-Valverde, C., Improved methods of oligosacchride analysis for genetic studies of legume seeds (1994) J Liquid Chromat, 17 (11), pp. 2469-2483Revilleza, M.J.R., Mendonza, E.M.T., Raymundo, L.C., Oligosaccharides in several philippine indigenous food legumes: Determination, localization and removal (1990) Plant Foods Hum Nutr, 40 (1), pp. 83-93Sosulki, F.W., Elkowicz, L., Reichert, R.D., Oligosaccharides in eleven legumes and their air-classified protein and starch fractions (1982) J Food Sci, 47 (2), pp. 498-502Macrae, R., Zand-Moghaddam, A., The determination of the component oligosaccharides of lupinseeds by high pressure liquid chromatography (1978) J Sci Food Agric, 29 (12), pp. 1083-1086Reeves, P.G., Nielsen, F.H., Fahey G.C., Jr., AIN-93 purified diets for laboratory rodentsfinal report of the American Institute of Nutrition ad hoc writing commitee on the reformulation of the AIN-76A rodent diet (1993) J Nutr, 123 (11), pp. 1939-1951Pellet, P.L., Young, V.R., (1980) Nutritional Evaluation of Protein Foods, , Tokyo: The United Nations University, 154pGuzmán-Maldonado, H., Castellanos, J., González De Mejía, E., Relationship between theoretical and experimentally detected tannin content of common beans (Phaseolus vulgaris, L.) (1996) Food Chem, 55 (4), pp. 333-335Chitra, V.U., Variability in phytic acid content and protein digestibility of grain legumes (1995) Plant Foods Hum Nutr, 47 (2), pp. 163-172Sharma, A., Shegal, S., Effect of domesting processing, and germination on the trypsin inhibitor activity and tannin content of faba bean (Vicia faba) (1992) Plant Foods Hum Nutr, 42 (2), pp. 127-133Mulyowidarso, R.K., Fleet, G.H., Buckle, K.A., Changes in the concentration of carbohydrates during the soaking of soybeans for tempe production (1991) Intern. J Food Sci Technol, 26 (6), pp. 595-606Vidal-Valverde, C., Frias, J., Sotomayor, C., Diaz-Pollan, C., Fernandez, M., Urbano, G., Nutrients and antinutritional factors in faba beans as affected by processing (1998) Zeitung Lebensm Unters Forsch, 207 (2), pp. 140-145Nwinuka, N.M., Abbey, B.W., Ayalogu, E.O., Effect of processing on flatus producing oligosaccharides in cowpea (Vigna unguiculata) and the tropical african yam bean (Sphenostylis sternocarpa) (1997) Plant Foods Hum Nutr, 51 (3), pp. 209-218Khalil, A.H., Mansour, E.H., The effect of cooking autoclaving and germination on the nutritional quality of faba beans (1995) Food Chem, 54 (2), pp. 177-182Abdel-Gawad, A.S., Effect of domestic processing on oligosaccharide content of some dry legume seeds (1993) Food Chem, 46 (1), pp. 25-31Sgarbieri, V.C., Composition and nutritive value of beans (Phaseolus vugaris, L) (1989) World Rev Nutr Diet, 60 (46), pp. 132-198Kataria, A., Chauhan, B.M., Punia, D., Effect of domestic processing and cooking methods on the contents of carbohydrates of amphidiploids (black gram × mung bean) (1990) Food Chem, 36 (1), pp. 63-72Jood, S., Mehta, U., Singh, R., Effect of processing on available carbohydrates in legumes (1986) J Agric Food Chem, 34 (3), pp. 417-420Aw, T.L., Swanson, B.G., Influence of tannin on Phaseolus vulgaris protein digestibility and quality (1985) J Food Sci, 50 (1), pp. 67-71Khokhar, S., Fenwick, G.R., Phytate content of indian foods and intakes by vegetarian indians of Hisar region, Haryana state (1994) J Agric Food Chem, 42 (11), pp. 2440-2444Reddy, N.R., Sathe, S.K., Salunkhe, D.K., Phytates in legumes and cereals (1982) Adv Food Res, 28, pp. 1-91