Preparation method of Chinese Quince extract with antimicrobial activity

摘要

PURPOSE: A preparation method of an extract of fruits of Chinese quince having antimicrobial activity is provided to minimize loss of the functional ingredients of the fruit. CONSTITUTION: The extract is prepared by washing sorted quinces and sealing the fruits tightly with vinyl; (ii) freezing the quinces wrapped with the vinyl at a temperature from -40 to -10deg.C and defrosting the frozen quinces to 4-30deg.C; (iii) repeating the freezing and defrosting process 2-4times to ease separation of the flesh of the quinces; (iv) blending the quinces and compressing the blended fruit materials before leaving for 30min; and then (v) filtrating the pressed fruit juice and freeze concentrating the resulting quince juice. The quince extract containing abundant sugar, calcium, phosphorus and vitamin C with unique scent and organic acid can be mixed with antioxidant such as sorbic acid, chitosan or Paraben in a ratio of 1:1 or 1:2 to be used as a preservative of jam, syrup, gum, candies, beverage or liquors to promote the storage life and the safety of the foods.