نتایج جستجو برای: hplc esi msms
تعداد نتایج: 41612 فیلتر نتایج به سال:
BACKGROUND Jujube extract is commonly used as a food additive and flavoring. The sensory properties of the extract, especially sweetness, are a critical factor determining the product quality and therefore affecting consumer acceptability. Small molecular carbohydrates make major contribution to the sweetness of the jujube extract, and their types and contents in the extract have direct influen...
The degree of oxidized cysteine (Cys) 34 in human serum albumin (HSA), as determined by high performance liquid chromatography (HPLC), is correlated with oxidative stress related pathological conditions. In order to further characterize the oxidation of Cys34-HSA at the molecular level and to develop a suitable analytical method for a rapid and sensitive clinical laboratory analysis, the use of...
A study to establish relationship between the petal colour, extraction solvent, phenolic, flavonoid, anthocyanin content and antioxidant activity in three varieties of Viola × wittrockiana (yellow, red and violet) is reported in this article. Identification and quantification of flavonoids and anthocyanins using HPLC-DAD-ESI-MS is also presented. The antioxidant activity was studied by four dif...
Protein spots from two-dimensional (2-D) gel electrophoresis of a human erythroleukemia cell line have been identified by analysis of the in-gel tryptic digests using capillary high performance liquid chromatography (HPLC) separation with on-line detection using electrospray ionization mass spectrometry (ESI-MS). This is performed using an electrospray/ion trap storage/reflectron time-of-flight...
Liquid chromatography electrospray ionization tandem mass spectrometry (LC/ESI-MS/ MS) and high-performance liquid chromatography (HPLC) methods have been used to identify and quantify the major taxoids from extracts of Taxus chinensis cell cultures. Chromatography was carried out on a reverse phase C18 column with isocratic-mode elution. By analytically comparing LC/ESI-MS/MS of the extracts w...
Although 17β-estradiol (E2) deficiency has been linked to the development of osteoarthritis (OA) in middle-aged women, there are few studies relating other estrogens and estrogen metabolites (EMs) to this condition. We developed a high-performance liquid chromatography-electrospray ionization-tandem mass spectrometry (HPLC-ESI-MS/MS) method to measure the levels of six EMs (i.e., estrone, E2, e...
BACKGROUND Migrant men who have sex with men (MSM) have a higher predisposition for HIV transmission. We aimed to determine and compare the prevalence and trends of HIV, Syphilis, and HCV between migrant and resident MSM in Shandong, China. METHODS A serial cross-sectional study was conducted in eight cities in Shandong, China from 2010 to 2014. The surveys collected information on demographi...
In this paper we analyse static properties of mass spring models (MSMs) with the focus modelling non crystalline materials, and explore basic improvements, which can be made to MSMs disordered point placement. Presented techniques address problem high variance MSM occur due randomised nature distribution. The is placed on tuning parameters in a way would compensate for local non-uniformity dens...
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