Analysis and evaluation of nutrient composition of red jujube from different areas in China

Extraction process of red jujube was studied firstly.Using ratios of materials and water,total sugar concentration and the yield as indicators,on the basis of single-factor experimental design and orthogonal experiments,the optimum extraction process was obtained as follows,temperature 70℃,ratios of material to water 1∶8,extraction for 45min.In addition,nutrients,indicated with total sugar contents,protein contents,the flavonoids contents and VC contents,of red jujube from the six main cultivation areas were analyzed with the extraction procedures determined.The results showed that total sugar contents and protein contents of red jujube from Hebei Cangzhou are the highest,while the contents of flavonoids and VC slightly lower than red jujube from other areas;contents of flavonoids and VC of red jujube from Shaanxi Qingjian are highest,jujube from where can be used as the raw materials for healthy food;jujube from Shandong Zhanhua had the lowest total sugar contents,while jujube from Xinjiang Hetian had minimum of protein,which is only 3136.56mg/L,jujube from Shanxi Lvliang and Henan Zhengzhou had similar contents of indicators.This study would not only help the research and development of red jujube resources,but also be helpful for breeding,high quality fruit production development.