I am Huajun Fan, graduated from Sichuan University, Huazhong University of Science and Technology and Sun Yat Sen University with a Bachelor of Science in analytical chemistry, a master's of engineering in applied chemistry and a doctorate of science in analytical chemistry. As professor and master's supervisor, I work at Guangdong Pharmaceutical University. A participant in more than 20 research projects such as national key basic research development program, the National Natural Science Foundation, the Guangdong science and technology plan, the Guangzhou Science and technology support plan, etc. Experience and technology have been constantly accumulated. With a doctor of science degree, my research has been focused on sample pretreatment techniques, pharmaceutical analysis and food safety for more than 30 years. So far, more than 100 research papers have been published in 18 journals such as Food Chemistry, Ultrasonics Sonochemistry, Separation and Purification Technology, Industrial Crops and Products, Journal of Chromatography A, Carbohydrate Polymers, International Journal of Biological Macromolecules, Microchemical Journal, Journal of Pharmaceutical and Biomedical Analysis, Food Analytical Methods, etc. Moreover, as the deputy chief editor, Analytical Chemistry (8th and 9th editions) was partly written by me. It was in the Guangdong chemical society as well as the drug quality analysis and Process Control Council where my role used to be a director.