Prolong the shelf-life of chilled kofta using extract of green tea leaves

الملخص EN

The effects of various concentrations of green tea, Camellia silences, extract on the sensory, bacteriological and chemical quality of Egyptian traditional Kofta were studied.

For this purpose, kofta samples were divided into five groups.

First group was kept as a control, others groups were treated with 0.5 % ; 1.0 % ; 1.5 % and 2.0 % green tea extract (GTE).

All samples were stored at 4' C whereas sensory, bacteriological and chemical evaluation of the samples was conducted at 0; 2; 4; 6 and 8 days post-storage.

Flavors and taste were accepted by panelists with high score in samples treated with concentrations between land 1.5 % GTE.

There were marked discoloration changes of kofta samples treated with 2.0 % GTE.

Total psychrophilic counts reached the unacceptable count (5x 106) at 6th day in 0% control samples while reached 8* 105; 4* 105; 7x 105 and 8x10* at 8th day in each treated samples with 0.5%; 1.0%; 1.5% and 2.0% GTE respectively.

Green tea extract showed an inhibitory effect on C.

perfringens, Enter-obacteriaceae and Staphylococcus aurous counts with increased storage time in compared to control samples.

Also, beef kofta samples treated with green tea extract showed lower pH and thiobarbituric acid reactive substance values all over the storage period compared to control.

These results suggest that green tea extract treatment could be effectively used to extend the shelf-life of fresh kofta for up to 8 days when stored at 4˚C.