Sentences with phrase «by liquid chromatography»

Quantitative measurement of endogenous estrogens and estrogen metabolites in human serum * by liquid chromatography - tandem mass spectrometry.

Total, Membrane, and Immunogenic Proteomes of Macrophage - and Tick Cell - Derived Ehrlichia chaffeensis Evaluated by Liquid Chromatography - Tandem Mass Spectrometry and MALDI - TOF Methods

The figure shows the amount of ciprofloxacin in relation to the total organic mass (µg / g) measured by liquid chromatography mass spectrometry.

Fluoroquinolones were analyzed by liquid chromatography coupled to an ion trap mass spectrometer and electro spray interface (LC - ESI - IT - MSMS).

Simultaneous quantitative determination of 5 - aza - 2 ′ - deoxycytidine genomic incorporation and DNA demethylation by liquid chromatography tandem mass spectrometry as exposure - response measures of nucleoside analog DNA methyltransferase inhibitors.

This technique performs mass spectrometry on a whole extract, rather than separating it first by liquid chromatography.

The samples were analyzed by liquid chromatography - mass spectrometry (LC - MS) to characterize the metabolite composition («metabolomics»), and biocrust DNA was extracted for shotgun sequencing to measure single copy gene markers for the dominant microbe species («metagenomics»).

Shen, Y., Han, C., Zhou, X., Chen, X., Huang, F., Zhu, Z., «Microwave - assisted extraction and determination of dicyandiamide residue in infant formula samples by liquid chromatography - tandem mass spectrometry», Journal of Dairy Science, 96 (11), 6877 - 6882, Nov 2013.

For Golden Rice β - carotene, analysis of serum samples by liquid chromatography / atmospheric pressure chemical ionization - mass spectrometry (23) showed that the labeled β - carotene was absorbed intact after consumption of the cooked Golden Rice.

Deuterium enrichment profile of Golden Rice β - carotene analyzed by liquid chromatography / atmospheric pressure chemical ionization - mass spectrometry (positive ion mode).

Not exact matches

They also monitor the heat of the batch, and of the oleoresin added, by using high performance liquid chromatography (HPLC) testing.

Furthermore, tests using a new test called liquid chromatography - mass spectrometry (LC - MS)-- scientists believe it is a more accurate way to measure gluten in fermented beers — showed that even though all the tested beers «had been rated by their makers to have gluten levels below 20 mg / kg, according to ELISA», the new test «found detectable gluten fragments in every sample using LC - MS, and most had much higher levels of gluten than ELISA detected.»

They would have to be tested by High Performance Liquid Chromatography, and I don't know if that has been done.

by Brian Ruddell Editor's Note: Brian Ruddell, a New Zealander studying in Australia, was kind enough to write us about High Performance Liquid Chromatography tests that he performed on a number of chiles that he grew in his garden, as well as a famous hot sauce.

With this labeling method, the intrinsically labeled Golden Rice β - carotene showed a protonated molecule of m / z of Mβc + H + = 536 + 1 (representing unlabeled β - carotene) and a range of isotopomers with the most abundant showing an enrichment of 9 deuterium at Menrich - βc = Mβc + H + + 9 mass units (Figure 4) as analyzed by using the liquid chromatography / mass spectrometry with a positive atmospheric pressure chemical ionization interface (the total m / z was Mβc + 9 + H + = 536 + 9 + 1 = m / z 546)(23).

However for many of the reasons above, it was soon evident that the test was highly subjective, and today it has replaced by High Pressure Liquid Chromatography (HPLC).

Total urinary As was measured by collision cell ICP - MS using germanium as an internal standard.30 Arsenic species were obtained by a high - performance liquid chromatography GP50 pump (Dionex Corp) and a PRP100X column (Hamilton Co) connected to a collision cell ICP - MS.29, 31 - 33 Approximately 10 % of samples were run in duplicate for both analyses.

At CFS, I was trained by senior scientists and qualified technologists in 1) theory and operation of analytical instruments and techniques (e.g., liquid chromatography, gas chromatography, mass spectroscopy, ELISA); 2) their application to forensic toxicology; 3) interpretation of results; and 4) advantages and limitations of these methods.

German's colleague Carlito Lebrilla decided to attempt the job with the university's new nanoflow liquid chromatography time - of - flight machine, which identifies molecules by measuring the time it takes them to ping around a tube that looks like a stovepipe.

Using liquid chromatography - mass spectrometry (a process that separates complex mixtures and analyzes ingredients by measuring a weight - to - charge ratio), researchers compared the constituent chemicals in the food to standards for common molds, heavy metals and ethylene glycol (or antifreeze, which Goldstein says is the number one cause of kidney failure).

In theory, they can do this by separating the acids with high performance liquid chromatography, but results from this method need to be compared to analytical standards, which do not yet exist for the individual compounds.

Kehr, J.; Hu, X.J.; Yoshitake, T.; Scheller, D. Determination of the dopamine agonist rotigotine in microdialysates from the rat brain by microbore column liquid chromatography with electrochemical detection.

Magno Junqueira (Shevchenko, MPG)-- «Systematic characterization of mammalian protein complexes by shotgun liquid chromatography tandem mass spectrometry» (2009)

The researchers used an innovative open - access bioinformatics pipeline developed by the group to process and annotate liquid chromatography / mass spectrometry data.

Humphries - Bickley, T, Castillo - Pichardo, L, Corujo - Carro, F, Duconge, J, Hernandez - O'Farrill, E, Vlaar, C, Rodriguez - Orengo, J, Cubano, L, and Dharmawardhane, S. Pharmacokinetics of Rac Inhibitor EHop - 016 in Mice by Ultra-Performance Liquid Chromatography Tandem Mass Spectrometry.

Determination of morphine in urine by solid - phase immunoextraction and high - performance liquid chromatography with electrochemical detection.

Pooled plasma samples were separated by gel - filtration fast - performance liquid chromatography (FPLC).

ApoC - III ASO treatment reduced TG levels in chylomicrons, VLDL, and remnant particles in all of the mutants as measured by size - exclusion fast protein liquid chromatography (FPLC)(Figure 2, A — E), but had no effect in Ldlr — / — Lrp1fl / fl Alb - Cre + mice (Figure 2F).

Cells were then washed in medium, and metabolites were extracted with acetone and analyzed by reverse - phase high - performance liquid chromatography (HPLC) and by electrospray mass spectrometry as described previously (19).

Phytochemical profile and nutraceutical potential of chia seeds (Salvia hispanica L.) by ultra high performance liquid chromatography, National Center for Biotechnology Information, 6 - 2014

The founders of http://natural.getprograde.com/ solved this problem by requiring that all of their products go through High Performance Liquid Chromatography (HPLC) testing to guarantee what they say is in the bottle is TRULY in the bottle, and delivers the desired results.

solved this problem by requiring that all of their products go through High Performance Liquid Chromatography (HPLC) testing to guarantee what they say is in the bottle is TRULY in the bottle, and delivers the desired results.

Cholesterol absorption was measured during the same period from fecal samples by gas — liquid chromatography and mass spectrometry.21

Exposure was confirmed by isolation of moxidectin from a biopsy specimen of adipose tissue, using liquid chromatography - mass spectroscopy methods.

Trace Determination of Tamoxifen in Biological Fluids Using Hollow Fiber Liquid - Phase Microextraction Followed by High - Performance Liquid Chromatography - Ultraviolet Detection

On the day that families completed questionnaires in the clinic, each patient provided blood for A1c, measured by high - performance liquid chromatography (reference range 4.0 — 6.0 %; Tosoh 2.2; Tosoh Bioscience, South San Francisco, CA).