Author/Authors :
Rodriguez-Miranda، J. نويسنده Division de Estudios de Posgrado e Investigacion, Instituto Tecnologico de Durango. Blvd. Felipe Pescador 1830 Ote., Col. Nueva Vizcaya, Mexico. , , Delgado-Licon ، E. نويسنده Division de Estudios de Posgrado e Investigacion, Instituto Tecnologico de Durango. Blvd. Felipe Pescador 1830 Ote., Col. Nueva Vizcaya, Mexico. , , Hernandez-Santos ، B. نويسنده Division de Estudios de Posgrado e Investigacion, Instituto Tecnologico de Durango. Blvd. Felipe Pescador 1830 Ote., Col. Nueva Vizcaya, Mexico. , , Reyes-Jaquez ، D. نويسنده Division de Estudios de Posgrado e Investigacion, Instituto Tecnologico de Durango, Blvd. Felipe Pescador 1830 Ote., Col. Nueva Vizcaya, Mexico. , , Aguilar-Palazuelos ، E. نويسنده Universidad Autonoma de Sinaloa, Maestria en Ciencia y Tecnologia de Alimentos, Josefa O. de Dominguez, Ciudad Universitaria, 80040 Culiacan, Mexico. , , Medrano-Roldan ، H. نويسنده Division de Estudios de Posgrado e Investigacion, Instituto Tecnologico de Durango. Blvd. Felipe Pescador 1830 Ote., Col. Nueva Vizcaya, Mexico. , , Navarro-Cortez ، R. O. نويسنده Division de Estudios de Posgrado e Investigacion, Instituto Tecnologico de Durango. Blvd. Felipe Pescador 1830 Ote., Col. Nueva Vizcaya, Mexico. , , CASTRO-ROSAS، J. نويسنده , , Gomez-Aldapa ، C. A. نويسنده Centro de Investigaciones Quimicas, ICBI–UAEH, Carretera. Pachuca-Tulancingo Km 4.5, 42184 Mineral de la Reforma, Hidalgo, Mexico. ,
Abstract :
The most important physical properties affecting quality in aquaculture feeds are floatability, hardness, stability and sinking velocity. An evaluation was done of the effect of different concentrations (25, 50, 75 and 100 g Kg-1) of native potato starch (PSt) and pregelatinized potato starch (PPSt) on functional properties in an extruded aquafeed. Maximum bulk density values were observed in the PPSt treatments, with a high value of 1.06 g cm-3 in the 25 g Kg-1PPSt treatment. Hardness increased from 1.63 to 5.11 N in the PPSt treatments. Sinking velocity also increased, from 5.84 to 7.47 cm s-1, while water solubility index values decreased from 12.8 to 7.9%. Use of PPSt did not affect (P > 0.05) the expansion index, the water absorption index (g Kg-1) or color (L*, a* and b*). Addition of PPSt improved aquafeed pellet hardness without affecting the expansion index, preventing pellet disintegration and lixiviation of hydrosoluble nutrients. Of the tested concentrations, the optimum PPSt level was 100 g Kg-1 in fish meal (60%) based formulas.
