RESUMEN
Molecular imprinting technology for the preparation of polymers with specific molecular recognition function had become one of the current research hotspots. It has been widely applied in chromatographic separation, antibody and receptor mimetics, solid-phase extraction, bio-sensors, and other fields in the last decades. In this study, molecular imprinting technology was summarized from the points of templates and dummy templates, and four typical target analytes were selected to compare the differences between templates and dummy templates. The current status and prospects of molecular imprinting technology were also proposed.
Asunto(s)
Impresión Molecular , Polímeros , Extracción en Fase SólidaRESUMEN
OBJECTIVE: To investigate the chemical constituents of root of Rubus biflorus. METHODS: Isolation and purification were carried out by silica gel column chromatography and recrystallization and so on. Structural determination of the pure compounds was based on physico-chemical properties and various spectral data analysis (1H-NMR, 13C-NMR, IR, EI-MS). RESULTS: Five compounds were isolated and identified as follows: lupeol acetate (I), corosolic acid (II), oleanic acid (III), 2alpha-hydroxyoleanolic acid (IV), sitosterol (V). CONCLUSION: All these compounds are isolated from this plant for the first time.
Asunto(s)
Plantas Medicinales/química , Rosaceae/química , Esteroides/aislamiento & purificación , Triterpenos/aislamiento & purificación , Espectroscopía de Resonancia Magnética , Estructura Molecular , Ácido Oleanólico/análogos & derivados , Ácido Oleanólico/química , Ácido Oleanólico/aislamiento & purificación , Raíces de Plantas/química , Sitoesteroles/química , Sitoesteroles/aislamiento & purificación , Esteroides/química , Triterpenos/químicaRESUMEN
This project is to study chemical constituents of Rubus biflorus Buch (Chinese name "Fenzhimei"), isolated by silica gel chromatography and structure determined by spectroscopic techniques. Two flavones were isolated from Rubus biflorus Buch and identified as 8-methyl-6-(3"-methylbut-2"-enyl)-5, 7-dihydroxy-5'-methoxy-3', 4'-methylenedioxy flavone (A) and 8-methyl-5-methoxy-6,7-(2", 2"-dimethylpyran)-3', 4'-methylenedioxy-5'-(3'''-methylbut-2'''-enyl) flavone (B), named as fenzhimines A and B, respectively. Compounds A and B are two new flavonoids.