Photo-oxidation of pasteurized milk in polyethylene pouch packs

In the present study photo-oxidative stability of pasteurized milk packaged in polyethylene pouches was investigated. milk packaged in three layer polyethylene pouch packs was exposed to 400,600 and 800 1x florescent light at 4 °c for 6 days,compared with a control (stored in dark). light had a pronounced effect on fat content of milk with no effect on protein,lactose and ash content. photo-oxidative stability of milk decreased as the intensity of light increased,peroxide value,anisidine value and conjugated dienes increased during the storage period of 6 days,higher values were observed in samples exposed to 800 1x florescent light. after 6 days of storage period,milk exposed to 400 1x florescent light did not reveal any oxidized flavour. the results of this study depicted that polyethylene pouches have the capability to resist photo-oxidation up to 400 1x light.