A strain of Alicyclobacillus acidoterrestris was isolated from a packaged spoiled pasteurized pear juice, then it was grown in vitro in order to verify the effectiveness of a pasteurization treatment in the presence of chitosan. A response surface model was developed for the effects of thermal treatment, low molecular weight (LMW) chitosan and pH on the survival of A. acidoterrestris spores. Survival depends on the interaction among the independent variables, in particular it was affected by pH, thermal treatment and chitosan concentration as individual terms and by chitosan concentration in its quadratic term. Chitosan demonstrated a significant reducing effect on the A. acidoterrestris spores. The model was validated against data not used in its development. Results indicated that the model is able to provide reliable prediction of the influence of chitosan and pH on heat-resistance of A. acidoterrestris spores.
Effectiveness of pasteurization on Alicyclobacillus aciditerrestris spore in presence of low molecular weight chitosan / Falcone, Pasquale Massimiliano; D., Campaniello; C., Altieri; M., Sinigaglia; M. R., Corbo; M., Anese; M. A., DEL NOBILE. - In: ITALIAN JOURNAL OF FOOD SCIENCE. - ISSN 1120-1770. - Special issue:(2004), pp. 142-151.
Effectiveness of pasteurization on Alicyclobacillus aciditerrestris spore in presence of low molecular weight chitosan
FALCONE, Pasquale Massimiliano;
2004-01-01
Abstract
A strain of Alicyclobacillus acidoterrestris was isolated from a packaged spoiled pasteurized pear juice, then it was grown in vitro in order to verify the effectiveness of a pasteurization treatment in the presence of chitosan. A response surface model was developed for the effects of thermal treatment, low molecular weight (LMW) chitosan and pH on the survival of A. acidoterrestris spores. Survival depends on the interaction among the independent variables, in particular it was affected by pH, thermal treatment and chitosan concentration as individual terms and by chitosan concentration in its quadratic term. Chitosan demonstrated a significant reducing effect on the A. acidoterrestris spores. The model was validated against data not used in its development. Results indicated that the model is able to provide reliable prediction of the influence of chitosan and pH on heat-resistance of A. acidoterrestris spores.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
