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A label-free surface-enhanced Raman scattering (SERS) strategy based on silver-coated gold nanoparticles (Au@Ag NPs) was developed for rapid detection of penicilloic acid (PA) in milk products. It has been demonstrated that core size and shell thickness of Au@Ag NPs are two critical variants affecting enhancement of Raman signals by coupling of two plasma resonance absorption. The Au@Ag NPs with 26-nm...
Six water-soluble phenylpropanoid compounds obtained from Rhodiola crenulata (R. crenulata) were fractionated by high-speed counter-current chromatography (HSCCC), and purified by semi-preparative high-performance liquid chromatography (Semi-prep HPLC). The purities of the six compounds were all above 98.0% and their structures were identified by spectroscopic methods. Among them, a new compound,...
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