2.2. Sample preparation
Green asparagus (100 g) were squeezed and filtered by a food processor (National. Model MU-C85: Tokyo, Japan; pore size of the filter r-0.2 mm) to obtain the juice (72.8 g) After centrifuga- tion for 30 min at 10,000g, the supernatant (46.6 g) was filtered, frozen at -80 °C, and then lyophilised for 48 h. This dehydrated powder (5.8 g) was named the aqueous extracts of green asparagus extracts (AGA).