China, one of the main citrus original in the globe, has rich citrus germplasm resources, whose annual production ranks the second all over the world at present. According to the epidemiological and animal researches, citrus fruits have many active effects on humans' health due to the flavonoids, carotenoids, limonoids, and etc., such as antioxidation, anticancer, prevention of circulatory disorders and so on; therefore, flavonoids in citrus have been more and more applied to functional food. As ...