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reduced signicantly by excluding oxygen from the storage pouches. It was also suggested that prole analysis could serve to distinguish the age of tea lots for the different packaging conditions. However, efforts to use headspace analysisas an indicator of storage time of roasted ground coffee led to the conclusion that such methods are only dependable if the temperature history of the product is known (. Along similar lines, it has been suggested that propanethiol -oxide (PSO) can be used as marker for freshness of stored scallions ( on the basis of linear approxima- tions of PSO production as function of time by scallions stored at 0 Co r5C. However, further work is needed to determine relationships between PSO levels and remaining fresh-quality lifetime. There have also been several studies showing the promise of hexanal, aprincipal volatile from the oxidative breakdown of fatty acids, as an indicator of stabilityof oils and oil-bearing grains and grain products, .., oats ( and soybeans (. Manycommodities are subjected to chemical or heat treatments to improve their storability, to reduce the possibility of invasion by bacterial and fungal pathogens, and to prevent damage by insects. Pretreatments involving short-term storage in anaerobic conditions have re-cently been proposed as alternative measures of insect and pathogen control, and as tech-niques to enhance avor and aroma production of fresh commodities. Since such pretreat-ments alter the volatile proles, the observed trends in prole during storage may also bedifferent from those in the untreated cases. Various chemicals are currently used in the potato industry to inhibit sprouting dur- ing storage. Maleic hydrazide is preharvest foliage spray used for this purpose. Isopropyl--(3-chlorophenyl)carbamate (CIPC) is an inhibitor that is applied as thermal fogthrough the storage ventilation system after volatilization of the product and is normallysuspended in methanol or propylene glycol and HiSol