Plant extracts are derived from plants in nature and are naturally and safely characterized. Rosemary extract ( RE ) and green tea extract ( GT ) are widely used in food processing because of their low price and strong oxidation resistance. RE contains active ingredients such as rosemary powder, rosmarinic acid, and carnosic acid. Add the salmon RE 0.3g extravagant in / Kg extended frozen storage shelf life of up to 6 months, add RE 0.3g / Kg extend the shelf life of frozen beef to 180d in Hamburg, add in chicken muscle RE 0.5g / Kg can Extend the shelf life to 21d . In the oil industry, RE has a 2-4 times higher antioxidant activity than BHT (dibutylhydroxytoluene) and BHA (tert-butylhydroxyanisole) , which is superior to vitamin C and 1-2 times that of tea polyphenols . The main components of GT are catechins, flavonoids, and anthocyanidic compounds. GT can be added to beef, chicken, and fermented sausages to extend their shelf life. 
