alues exact data acc to orderrelated documentatio B3SV-14-C Bevel-helical gear reducers B3

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ogies such as controlled atmosphere (CA) and hypobaric storage can alter the metabolism of the produce, .., ethylene metabolism in apples (, and lead to quantitatively different volatile proles than under normal atmosphere storageconditions. Qualitative differences may also occur (; however, these may actually bequantitative (. For example, compounds that are present in very small amounts may notbe detectable at one temperature or for given volume of airow through an adsorbenttrap, whereas at higher temperature or ltered volume, they may appear as peaks in achromatographic trace. There are also instances in which natural compounds are degraded if the gas chromatography (GC) apparatus is operated at high temperatures. These factors, and the nature of the adsorbent trap, must be taken into account in assessing the publishedliterature. This chapter reviews some relevant fundamental research on volatiles of agricultural Volatile Monitoring in Storage 5 commodities and of their storage pathogens and then assesses the overall potential of volatile monitoring for early disease detection on the basis of research more specicallydirected toward that goal. 2 RESEARCH OBJECTIVES The research needed for the eventual development of an early disease detection system for stored commodities requires two basic sets of information: () the volatile proles ofthe commodity over time under normal circumstances and () changes in these prolesattributable to the proliferation of pathogens or to the onset of physiological disorders(.., chilling injury, anaerobiosis). Since these problems may be caused, to certain extent, by breakdown of the environmental control system, disease detection and environ- mental control should be integrated. The literature indicates that the volatile prole can depend on factors such as: variety (and even cultivar), characteristics of the production site, cultural practices, and type ofchemicals used in production and handling. Those that determine the exp