Özet:

Kale or black cabbage (Brassica oleracea L. var. acephala DC.)  is a member of Brassicaceae or Cruciferae family including a lot of vegetable species containing: broccoli, cauliflower, brussels sprouts, red cabbage etc.. Kale is consumed as a food source especially in Black Sea Region. Although Kale’s antioxidant property is known, there is limited information about it’s protective effect on lipid metabolism. The purpose of this study was to evaluate whether aqeuous and metanolic extracts prepearing from leaves of kale plant could have protective effects againts to the final product of lipid peroxide as malondialdehyde (MDA) in oxide lipoproteins by copper.  The prepared of aqeuous and metanolic extracts from dry leaves of kale at 5, 10, 25, 50 ve 100 µg/mL concentrations were added to low and very low density lipoproteins (LDL, VLDL) which were seperated with density gradient by ultracentrifugation. After 1 hour,  they have been exposed to oxidation by Cu+2 at 37oC during 24 hours and the levels of MDA was determined by thiobarbituric acide (TBARS) method. When it is compared with the levels of MDA without extracts, a statistically significant reduction was observed the level of MDA at both concentration of aqeuous and methanolic extracts in oxide LDL and also, only reduction at aqeuous extract with 100 µg/mL and methanolic extracts with 100, 50 and 25 µg/mL in oxide VLDL (p<0,05).  Finally, it may be said that the extracts of kale, especially methanolic extracts, may have inhibitive composition of lipid peroxidation in lipoproteins and therefore, nutrition with kale may be beneficial in prevention of cardiovascular diseases.

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