Estudio de la inactivación de microorganismos deteriorativos en jugos de manzana y melón tratados por luz pulsada y ultrasonido

  • Mariana Ferrario Universidad de Buenos Aires. Argentina
  • Sandra Guerrero Universidad de Buenos Aires. Argentina
Palabras clave: Tecnologías emergentes, tratamientos combinados, jugos frutales

Resumen

En este estudio se investigó el efecto de la luz pulsada (0-71,6 J/cm2, T< 20 °C) en sistema estanco (LPe) en la inactivación de esporas de Alicyclobacillus acidoterrestris ATCC 49025, células de Saccharomyces cerevisiae KE 162 yEscherichia coliATCC 35218 en jugos naturales de manzana (Pyrus malus L, var. Granny Smith, pH: 3,4; 11,4 ºBrix) y melón (Cucumis melo, var. rocío de miel; pH: 5,7 ± 0,2; 8,4 ± 2,5 °Brix). Por otra parte, se estudió el efecto de LP en flujo continuo (LPc, 0-0,73 J/cm2,0-0,0175 J/ml, 155 ml/min, T: 25 °C) Scombinado o no con ultrasonido (US, 20 kHz, 80%, 30 min, T: 25 °C) en la inactivación de E. coli en jugo de manzana. El tratamiento LPesimple provocó hasta 1,9-6,2 y 1,0-2,1 reducciones logarítmicas de A. acidoterrestris, S. cerevisiae yE. colien jugos de melón y manzana, respectivamente. Los tratamientos de LPcy US provocaron una reducción de 3,1 y 2,7 ciclos logarítmicos de E. colien jugo de manzana, respectivamente. La combinación US+LPcresultó aditiva dado que se logró una reducción de 5,7 ciclos logarítmicos. Los modelos bifásico y de Weibull brindaron mejor ajuste y estimación de los parámetros que el modelo de Coroller. El jugo de manzana resultó altamente aceptado por un grupo de consumidores que resaltaron su sabor a manzana natural.

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Publicado
2016-07-07
Sección
Artículos