title: Graphene-encapsulated silica as matrix solid-phase dispersion extraction sorbents for the analysis of poly-methoxylated flavonoids in the leaves of Murraya panaculata (L.) Jack.
abstract: In this study, graphene-encapsulated silica was synthesized by a hydrothermal reduction strategy. The presence of silica in graphene was identified by Fourier-transform infrared spectrometry, X-ray diffraction and scanning electron microscopy. The graphene-encapsulated silica subsequently was used as adsorbent for matrix solid-phase dispersion extraction of poly-methoxylated flavonoids from the dried leaves of Murraya panaculata (L.) Jack. Compared with the other adsorbents (graphene, silica gel, C18 silica, neutral alumina, diatomaceous earth) and without any adsorbents, better results were obtained. Then a method for analysis of poly-methoxylated flavonoids was established by coupling matrix solid-phase dispersion extraction with ultra high performance liquid chromatography and UV detection. Compared with reflux extraction and ultrasonic extraction, the proposed method is quicker, more efficient and more environmental protection. Less than 10 min is needed from extraction to detection.
authors.affiliation: College of Chemistry, Jilin University, Changchun, P. R., China.
authors.forename: Ting
authors.initials: T
authors.lastname: Sun
authors.affiliation: College of Chemistry, Jilin University, Changchun, P. R., China.
authors.forename: Xuwen
authors.initials: X
authors.lastname: Li
authors.affiliation: College of Chemistry, Jilin University, Changchun, P. R., China.
authors.forename: Jie
authors.initials: J
authors.lastname: Yang
authors.affiliation: College of Chemistry, Jilin University, Changchun, P. R., China.
authors.forename: Lanjie
authors.initials: L
authors.lastname: Li
authors.affiliation: College of Chemistry, Jilin University, Changchun, P. R., China.
authors.forename: Yongri
authors.initials: Y
authors.lastname: Jin
authors.affiliation: College of Quartermaster Technology, Jilin University, Changchun, P. R., China.
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Shi
mesh_terms: D000327:Adsorption; D002851:Chromatography, High Pressure Liquid; D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification*; D006108:Graphite / Q000737:chemistry*; D057230:Limit of Detection; D008855:Microscopy, Electron, Scanning; D032101:Murraya / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry*; D011208:Powders; D015203:Reproducibility of Results; D012822:Silicon Dioxide / Q000737:chemistry*; D052616:Solid Phase Extraction; D017550:Spectroscopy, Fourier Transform Infrared; D014465:Ultrasonics; D014961:X-Ray Diffraction
chemical_list: D005419:Flavonoids; D010936:Plant Extracts; D011208:Powders; D012822:Silicon Dioxide; D006108:Graphite
keywords: Flavonoids; Graphene; Matrix solid-phase dispersion; Murraya panaculata; Traditional Chinese medicine