Cellulose (medium cotton linters, C6288) was from Sigma Chemical (St. Louis, MO). Other commercial chemicals were of reagent grade or better and were used without further purification. FluoroFlash fluorous silica gel was from Aldrich Chemical (Milwaukee, WI). The term “concentrated under reduced pressure” refers to the removal of solvents and other volatile materials using a rotary evaporator a...

Abstract. The availability of a benchtop nuclear magnetic resonance (NMR) spectrometer, low cost and easily transportable, can allow detection quantities biosensors, provided that hyperpolarized species are used. Here we show the micromolar threshold be reached by employing laser-polarized xenon cage molecules reversibly hosting it. Indirect caged is made via chemical exchange, using ultra-fast...

Carbon-13 radiofrequency amplification by stimulated emission of radiation (C-13 RASER) is demonstrated on a bolus liquid hyperpolarized ethyl [1-13C]acetate, as reported Thomas Theis, Eduard Y. Chekmenev et al. in their Communication (e202215678). Spontaneous RASER signal emissions were detected using 1.4 T NMR spectrometer equipped with standard detection coil for over three minutes. enables ...

Flow scintillation analysis is commonly used to quantify the radioisotope label on organic compounds such as biochemicals, drugs, and metabolites separated from complex mixtures by High Performance Liquid Chromatography (HPLC). The subsequent task of determining the molecular structure of the separated substances can be formidable. Traditional methods of structure determination involve collecti...

Methods and procedures for gel-phase HR MAS spectroscopy Solution NMR spectra were acquired on a 300 MHz Bruker AC-300P FT spectrometer at 303 K. HR MAS NMR spectra were acquired on a Bruker DRX400 spectrometer at room temperature or below using a Bruker HR MAS microprobe. Rotors containing a suspension of the beads in CDCl 3 were spun at 4 kHz. One-dimensional HR MAS spectra were obtained with...

General considerations. All manipulations of air-sensitive compounds were performed using standard Schlenk techniques under argon atmosphere. NMR spectra were recorded with either a Bruker ARX 300, Bruker Avance DRX 600 or Varian INOVA-400 spectrometer. H and C NMR chemical shifts were referenced to H and C NMR signals of the deuterated solvents, respectively. High temperature NMR measurements ...

Synthesis, characterization, spectral and theoretical calculations of sodium tetrafluoroborate (III) (STFB) has been studied in this research. Sodium tetrafluoroborate (III) was synthesized by a sonochemical method and characterized by IR, UV/VIS, 11B-NMR and Mass spectrometer techniques. The nano compound was characterized by scanning electron microscopy (SEM), X-ray powder diffract...

An experimental investigation of the characteristics and transformation mechanism Jimsar oil shale derived was conducted using a solid-state nuclear magnetic resonance spectrometer (13C NMR), Fourier transform infrared spectroscopy (FT-IR), liquid 1H NMR, gas chromatography-mass spectrometry (GC-MS) techniques. The carbon skeleton structure is mainly composed aliphatic carbons (70.5%), mostly c...

errors ofmetabolism currently depends on sophisticated biochemical analysis. NMR analysis can simultaneously analyze the mixture of compounds in biological fluids, but complete analysis of biological fluids by NMR will not be necessitated. Accurate diagnosis should await the results by authenticated methods. Quickness is important. As might be seen from our paper, the need to pretreat urine to ...