Nisin peptide is one of the natural food preservative, is not toxic and produced by Lactococcus lactic during food fermentation. It has a high potency against gram-positive bacteria and spores, while its efficiency of Nisin against gram-negative b
acteria and fungi is low , currently Nisin is used as food preservative in many countries around the world for cheese products and others.
In this research, the total content of phenols and flavonoids was determined from the peels of some Syrian citrus fruits and the total antioxidant activity of them was studied, and the effect of changing the extraction method on this activity and content was studied.
