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Microemulsion thin layer chromatography (ME-TLC) has been developed for the fingerprinting of aqueous extract of licorice (Glycyrrhiza spp.). The separation conditions and operational processes of the method have been optimized, and its chromatographic characteristics compared with conventional TLC. The ME-TLC system is easier to operate, and with higher(More)
A reliable and rapid method based on high-performance liquid chromatography (HPLC-UV) and positive ion electrospray-time of flight mass spectrometry (ESI-TOF/MS) has been developed for the characterization and quantification of solanesol in extracts of tobacco leaves from different sources. The solanesol was extracted from tobacco leaf via saponification(More)
Five different flavonoids were isolated from licorice after multistep chromatographic fractionation. The aim was to identify and characterize active components in licorice responsible for antibrowning activities and to seek new tyrosinase inhibitors for applications as antibrowning and depigmenting agents in the food and cosmetic industries. The isolated(More)
Petroleum oil spill happens occasionally at sea. It's important to differentiate the exact products in order to carry out following actions to decrease harmfulness. In the present study, a rapid oil spill identification method by near infrared spectroscopy coupled with pattern recognition techniques is proposed. 56 simulated spilled oils of gasoline, diesel(More)
CE-based techniques with DAD and detection ESI-TOF-MS have been developed for the analysis of seven protoberberine alkaloids and one aporphinoid alkaloid in Huanglian (Rhizoma coptidis), a well-known traditional Chinese herbal medicine. One aqueous BGE and one nonaqueous BGE were developed for CE-DAD and CE-MS analyses, and the CE-ESI-TOF-MS conditions(More)
PURPOSE Gene expression and protein translation regulate and direct endothelial cell proliferation and differentiation. We initiated an unbiased global search for transcriptional changes occurring during endothelial cell vascular differentiation in vitro, focusing on genes not previously implicated in vascularization and angiogenesis. EXPERIMENTAL DESIGN(More)
A simple and reliable high performance liquid chromatographic (HPLC) method has been developed and validated for the fingerprinting of extracts from the root of Pseudostellaria heterophylla (Miq.) Pax. HPLC with gradient elution was performed on an authentic reference standard of powdered P. heterophylla (Miq.) Pax root and 11 plant samples of the root were(More)
A new method based on accelerated solvent extraction (ASE) followed by ultra performance liquid chromatography (UPLC) analysis has been developed for the identification and quantification of major alkaloids in extracts of Coptis chinensis Franch. The UPLC system consisted of a dual detection system of photodiode array detector (PDA) and positive ion(More)
Chinese herbal medicine is gaining increasing popularity worldwide as an alternative approach to the development of pharmaceuticals in therapeutic applications. Chemical characterization and compositional analysis of Chinese medicines provide the necessary scientific basis for the discovery and development of new drugs of natural origin. Applications of(More)
Marine invertebrates harbour a wealth of micro-organisms in their bodies. Most of these micro-organisms can catabolize antibiotic compounds as chemical-defence compounds. These compounds not only play an important protective role for their producer and for their hosts, but also have high potential in medicinal applications. In order to discover natural(More)