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Measurements of rhizosphere carbon efflux are critical to the determination of soil carbon balance by CO2 flux measurements. We attempted to measure rhizosphere respiration in a forest ecosystem by transplanting 13Cenriched soils from a tallgrass prairie into a mixed-conifer forest soil but found that atmospheric air mixing and lateral diffusion confounded(More)
A rapid liquid chromatography-electrospray ionization-tandem mass spectrometry (LC-ESI-MS-MS) method was developed and validated for the determination of salvianic acid A in plasma of Chinese healthy subjects after oral administration of Qishenyiqi dropping pills. After liquid-liquid extraction with ethyl acetate, salvianic acid A was chromatographed on a(More)
A sensitive and accurate LC-ESI-MS/MS method was developed and validated of for the determination of 6'-hydroxy justicidin A (HJA), a potential antitumor active component isolated from Justicia procumbens in rat plasma using a simple liquid-liquid extraction (LLE) method for sample preparation. Chromatographic separation was achieved on an Agilent(More)
In this study, a one-step, real-time, loop-mediated isothermal amplification (RealAmp) assay was developed, for the highly specific detection of pork DNA. For the assay, the mtDNA of cytochrome b (cytb) gene was amplified at 63 °C using SYBR Green I for 45 min with a Real-Time Polymerase Chain Reaction (PCR) System that measured the fluorescent signal at(More)
This study is the first to detail the development and validation of a rapid, sensitive and specific LC-ESI-MS/MS method for the determination of eriodictyol-8-C-β-d-glucopyranoside (EG) in rat plasma. A simple protein precipitation method was used for plasma sample preparation. Chromatographic separation was successfully achieved on an Agilent Zorbax XDB(More)
Plantainoside D (PD) is a potential anti-hypertensive active ingredient newly isolated from the dried plants of Chirita longgangensis var. hongyao. A sensitive and specific LC-ESI-MS/MS method was first developed and validated for the analysis of PD in rat plasma using genistein as the internal standard (IS). The plasma samples were pretreated with(More)
Polyphyllin D and Paris H are two potential antitumor active components in Paris polyphylla, one of the Traditional Chinese Medicines (TCMs). The present study details the development and validation of a rapid, sensitive and accurate LC-ESI-MS/MS method for the separation and simultaneous determination of Polyphyllin D and Paris H in rat plasma using(More)
This study firstly describes the development of an accurate and sensitive high-performance liquid chromatography-tandem mass spectrometry (LC-MS/MS) assay for the quantification of Taiwanin E methyl ether (TEME) in rat plasma. The assay involved a simple liquid-liquid extraction step with ethyl acetate and a gradient elution using a mobile phase consisting(More)
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