%0 Journal Article
%T Caracterizaci車n fisicoqu赤mica y reol車gica de la pulpa de guayaba (Psidium guajava L.) variedades H 赤brido de Klom Sali, Puerto Rico, D14 y Red Physicochemical and rheological characterization of guava pulp (Psidium guajava L.) varieties Hybrid Klom Sali, Puerto Rico, D14 and Red
%A Ricardo D ANDRADE P
%A Fabi芍n A ORTEGA Q
%A Everaldo J MONTES M
%A Ramiro TORRES G
%J Vitae
%D 2009
%I Universidad de Antioquia
%X Las propiedades reol車gicas de los jugos de fruta dependen de su variedad, estado de madurez, concentraci車n de jugo/pulpa y variaci車n de temperatura; los valores de 赤ndice de comportamiento al flujo e 赤ndice de consistencia son limitados, considerando la cantidad de variedades de guayaba. En este trabajo se caracteriza reol車gicamente la pulpa de guayaba (Psidium guajava L.) en las variedades H赤brido de Klom Sali, Puerto Rico, D14 y Red, cultivadas en el departamento de C車rdoba (Colombia); las pulpas son obtenidas mediante refinadora con malla 1.5mm de abertura. Las medidas reol車gicas se realizan en un viscos赤metro Brookfield modelo DV-II+ Pro, utilizando la aguja No 5 para las variedades Klom Sal赤, Puerto Rico y Red, y No 6 para la variedad D14. Las pulpas de guayaba presentan pH entre 3.9-4.6, oBrix entre 9-10, acidez titulable expresada como porcentaje de 芍cido c赤trico entre 0.56-0.96%, e 赤ndice de madurez entre 9.38-17.94; su comportamiento reol車gico se ajusta adecuadamente al modelo de Oswald de Waele o ley de potencia (R2≡ 0.989), comport芍ndose como un fluido seudopl芍stico (n ≒ 0.307) y presentando tixotrop赤a las variedades Puerto Rico (14.16%), Red (18.54%) y D14 (18.48%). Rheological properties of fruit juices appear to be very much dependent of their varieties, state of ripening, concentration of juice/pulp and temperature variation. Typical values of flow behaviour index and consistency index are rather limited considering the varieties of guava fruits. In this work the guava pulp (Psidium guajava L.) was rheologically characterized in the varieties Hybrid of Klom Sali, Puerto Rico, D14 and Red cultivated in the department of C車rdoba (Colombia); the pulps were obtained by means of refinery with mesh 1.5mm of opening. The rheological measurements were carried out in a Brookfield viscometer DV-II+ Pro model, used the spindle No 5 for the varieties Klom Sali, Puerto Rico and Red, and No 6 for the variety D14. The pulps presented pH among 3.90 - 4.6, oBrix among 9 - 10, acidity expressed as percentage of citric acid among 0.56 - 0.96% and maturity index among 9.38-17.94; were adjusted appropriately to Oswald-de Waele model or power law (R2≡ 0.989), behaving as a pseudoplastic fluid (n ≒ 0.307) and presenting tixotropic percentages the variety Puerto Rico (14.16%), Red (18.54%) y D14 (18.48%).
%K Viscosidad aparente
%K Seudopl芍stico
%K Modelo ley de potencia
%K Tixotrop赤a
%K Apparent viscosity
%K Pseudoplastic
%K Power law model
%K Tixotropy
%U http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0121-40042009000100002