Changes in chemical quality indices during long-term storage of palm-olein oil under heated storage and transport-type conditions

摘要: Six quality indices, namely free fatty acids (FFA), peroxide value (PV), anisidine (AV), oxidative stability index (OSI), total tocopherols and headspace volatiles (hexanal, t-2-hexenal t,t-2,4-decadienal), were evaluated in a long-term storage trial of 52weeks at 50 ◦ Co f palm-olein, monounsaturated oil. Three concentrations copper (0.035, 0.17 0.69mgkg −1 ) added. FFA values for all the sample treatments increased slightly over period but remained within acceptable limits. PV copper-containing samples declined initially then stable up to week 40, after which it 0.035 0.17mgkg samples. However, control (no added copper) steadily above limit. AV much more than that control. OSI tocopherol copper- containing markedly lower those t-2-Hexenal did not increase during period, whereas hexanal slower rate Conversely, had high levels t,t-2,4-decadienal none. AV, are most valuable indices assessing oil quality, FFA, can be misleading.  2003 Society Chemical Industry