radial fan and is mounted on the high speed shaf B4-DV-17-D Bevel-helical gearbox B4

Flender/Flender Gear Units/Bevel-helical gearbox B4

uits had less aroma and avor spurred research into possible causes and remedies. Examination of volatile proles has shown that although changes related to reduced aroma productionare strikingly quantitative, some qualitative changes may also be induced (. Other work ( indicated that apple cultivars whose aroma precursors are derived from fatty acids(ester-type cultivars) are more susceptible to aroma suppression in CA storage than those that derive aroma precursors from amino acids (alcohol-type cultivars). However, suppres- sion of aroma development is not necessarily due to the CA conditions per se, but to agingof the fruit, albeit at slower rate than in normal atmosphere storage (. Essentially,it is quite plausible that substrates necessary for aroma and avor development are moredepleted after prolonged CA storage than they would be in short period of normal atmo-sphere storage, since the amount of substrate available at the end of the storage period isthe initial concentration minus the time integral of depletion rate, . Although Dris smaller in CA conditions than in normal atmosphere, the time is longer. This could also explain the observations of many that even treatments meant to stimulate aroma and avorproduction after CA do not succeed in creating the same levels of volatiles as those mani-fested by the air-ripened fruit. Comparisons of volatiles generated under CA and other storage-extending tech- niques are nevertheless more complex than these summaries indicate. The outstanding difference between CA and normal atmosphere is in the rate of evolution of volatile pro- les as result of the much shorter life span of the commodity stored in normal air. Totalvolatile production tends to peak within few days of the beginning of storage, in associa-tion with ripening and aroma production, whereas it drops rapidly as substrates are de-pleted and nal senescence sets in. The CA-stored commodity, in general, exhibits lowproduction for long time unless an