Influence of Respiration on Predictive Microbial Growth of Aerobic Mesophilic Bacteria and Enterobacteriaceae in Fresh-Cut Apples Packaged Under Modified Atmosphere

摘要

Objectives in this study were to model/predict simultaneous influences of apple O-2-consumption/CO2-production rates (R-O2= CO2 and modified atmosphere packaging (MAP) (from volumetric concentrations of O-2/CO(2)dy O-2= CO2 _on microbial growth (Aerobic mesophilic bacteria, AMB; Enterobacteriaceae, EBac) in 2 fresh-cut apple cultivars treated with five anti-browning treatments and stored in refrigerator. Growth of both microorganisms was best predicted by length of shelflife, RO2= CO2; and y O-2= CO2 : With AMB/EBac growth, cultivar's RO2 decreased together with y O-2 in packaging. Similarly, with microbial growth RCO2 dropped, while simultaneously y CO2 increase was observed in package. Regression coefficients ratios for AMB-respiration models were similar to ratios for stoichiometric coefficients for respiration equation with malic acid as main substrate. Hence, presented models likely captured natural relations between predictors, and gave good estimate of AMB growth and its association with respiration in MAP. Apple browning had weak or no association with bacterial growth. Obtained models may be utilized to optimize industrial parameters with least AMB/EBac growth, hence facilitate extension of fresh-cut apple shelf-life.