C-glycosyl flavonoids has stable structure, high water-solubility and good biological activity, and has broad applications in nutrition, health and disease prevention and control. Due to the high content of C-glycosyl flavonoids in Phyllostachys edulis leaves, and commercially available bamboo leaf flavonoid extracts suffer from weak water-solubility and low purity, It is of great significance to study the preparation process of high water-solubility and high purity extract of bamboo leaf C-glycosyl flavonoids. We utilize Phyllostachys edulis as the raw material and focus on the main C-glycosyl flavonoids in Phyllostachys edulis leaves as quality control indicators, aims to investigate: 1. The hot soaking extracting methodology of Phyllostachys edulis leaves. 2. The extraction process of C-glycosyl flavonoids from the hot soaking extraction of Phyllostachys edulis leaves, along with the purification process using macroporous resin column chromatography. Through these processes, products with water-solubility and purity comparable to those of commercially available products can be prepared. 3. The process of purified C-glycosyl flavonoids by membrane separation; The ultrafiltration membrane with intercepted large molecular weight was used to remove the macromolecular material and obtained the high water-solubility and purity extraction of C-glycosyl flavonoids extracted from Phyllostachys edulis leaves. The water-soluble extract reaches the highest standard of ginkgo leaf extract, namely 5 grams of ginkgo leaves extract can dissolve in 100 ml of water at room temperature, which is brown red transparent liquid; the purity of the total flavonoids is above 50%, that is, the high water-soluble and high purity extraction of C-glycosyl flavonoids from bamboo leaves, which is better than the market products. The C-glycosyl flavonoids from bamboo leaves, small molecular weight, easy to be absorbed by human body, can effectively remove free radicals and ester peroxides, regulate blood pressure, reduce blood esters, anti-fatigue, anti-aging, etc., The C-glycosyl flavonoids from bamboo leaves is rich in resources, good activity, high safety, and has a wide market prospect in the field of drugs, food and chemical products. High water-soluble and high purity extract of C-glycosyl flavonoids in Phyllostachys edulis leaves can expand the development and application of the extract of C-glycosyl flavonoids in Phyllostachys edulis leaves in drugs, food, chemicals and other fields.

Guo Xuefeng, male, Han nationality, born in June 1972. The international centre for bamboo and rattan, Research institute of chemical utilization of bamboo and rattan resources, Ph. D. degree, Researcher title.

Education experience:

(1) From September 2004 to July 2007, Chinese Academy of Forestry, Ecology major, Doctor degree;

(2) From September 2001 to July 2004, Chinese Agricultural University, Fruit tree science major, Master degree;

(3) From September 1991 to July 1995, Huazhong Agricultural University, Fruit tree science major, Bachelor degree.

Scientific research and academic work experience:

(1) From November 2013 to present, The international centre for bamboo and rattan, Research institute of chemical utilization of bamboo and rattan resources, engaged in scientific research, Researcher;

(2) From July 2007 to November 2013, The international centre for bamboo and rattan, Research institute of chemical utilization of bamboo and rattan resources, engaged in scientific research, Associate researcher;

(3) From July 1995 to July 2001, Henan University of Science and Technology, Department of Horticulture, engaged in teaching and scientific research, Lecturer.

Since 1995, GUO Xuefeng has been dedicated to the research of natural products, focusing on the extraction, activity screening, structural identification, and the application development of natural products in the fields of pharmaceuticals, health products, food additives, cosmetics, and more. He has undertaken 6 research tasks, including projects funded by the National Natural Science Foundation, the National Science and Technology Support Program, the 948 Project, and forestry standard projects. He has published over 100 academic papers in domestic and foreign academic journals, with more than 20 papers included in SCI-indexed journals. Additionally, he holds 4 patents and has been awarded the third prize of the Liang Xi Youth Excellent Paper Award. Obtained 1 achievement of technology development and application technology recognized by the Forestry Society.