title: An effective vacuum assisted extraction method for the optimization of labdane diterpenoids from Andrographis paniculata by response surface methodology.
abstract: An effective vacuum assisted extraction (VAE) technique was proposed for the first time and applied to extract bioactive components from Andrographis paniculata. The process was carefully optimized by response surface methodology (RSM). Under the optimized experimental conditions, the best results were obtained using a boiling temperature of 65 °C, 50% ethanol concentration, 16 min of extraction time, one extraction cycles and a 12:1 liquid-solid ratio. Compared with conventional ultrasonic assisted extraction and heat reflux extraction, the VAE technique gave shorter extraction times and remarkable higher extraction efficiency, which indicated that a certain degree of vacuum gave the solvent a better penetration of the solvent into the pores and between the matrix particles, and enhanced the process of mass transfer. The present results demonstrated that VAE is an efficient, simple and fast method for extracting bioactive components from A. paniculata, which shows great potential for becoming an alternative technique for industrial scale-up applications.
authors.affiliation: Key Laboratory of Modern Preparation of Traditional Chinese Medicine, Ministry of Education, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004, China. wangyaqi_3@163.com.
authors.forename: Ya-Qi
authors.initials: YQ
authors.lastname: Wang
authors.affiliation: Key Laboratory of Modern Preparation of Traditional Chinese Medicine, Ministry of Education, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004, China. zfwu527@163.com.
authors.forename: Zhen-Feng
authors.initials: ZF
authors.lastname: Wu
authors.affiliation: Key Laboratory of Modern Preparation of Traditional Chinese Medicine, Ministry of Education, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004, China. kgandrgl@gmail.com.
authors.forename: Gang
authors.initials: G
authors.lastname: Ke
authors.affiliation: Key Laboratory of Modern Preparation of Traditional Chinese Medicine, Ministry of Education, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004, China. tcmmingyang@163.com.
authors.forename: Ming
authors.initials: M
authors.lastname: Yang
mesh_terms: D035685:Andrographis / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D013499:Surface Properties; D014618:Vacuum
chemical_list: D004224:Diterpenes