journal
MENU ▼
Read by QxMD icon Read
search

Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences

journal
https://www.readbyqxmd.com/read/28441545/targeted-mass-spectrometry-an-emerging-powerful-approach-to-unblock-the-bottleneck-in-phosphoproteomics
#1
REVIEW
Nerea Osinalde, Kerman Aloria, Miren J Omaetxebarria, Irina Kratchmarova
Following the rapid expansion of the proteomics field, the investigation of post translational modifications (PTM) has become extremely popular changing our perspective of how proteins constantly fine tune cellular functions. Reversible protein phosphorylation plays a pivotal role in virtually all biological processes in the cell and it is one the most characterized PTM up to date. During the last decade, the development of phosphoprotein/phosphopeptide enrichment strategies and mass spectrometry (MS) technology has revolutionized the field of phosphoproteomics discovering thousands of new site-specific phosphorylations and unveiling unprecedented evidence about their modulation under distinct cellular conditions...
April 17, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28441543/simultaneous-electrochemiluminescence-determination-of-galanthamine-homolycorine-lycorenine-and-tazettine-in-lycoris-radiata-by-capillary-electrophoresis-with-ultrasonic-assisted-extraction
#2
Shuangjiao Sun, Yanfen Wei, Yupin Cao, Biyang Deng
After ultrasonic-assisted extraction, four lycoris radiata alkaloids: galanthamine, homolycorine, lycorenine, and tazettine were determined by capillary electrophoresis electrochemiluminescence. Polyvinylpyrrolidone was added to the running buffer (RB) to obtain better resolution. Experimental conditions influencing the determination were examined, including the additives, detection potential, separation voltage, injection voltage and time, and RB pH and concentration. Under optimal experimental conditions, the baseline separation of the four alkaloids occurred within 16min...
April 14, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28441544/enrichment-of-resolving-power-improves-ion-peak-quantification-on-a-lipidomics-platform
#3
Kosuke Saito, Yasuo Ohno, Yoshiro Saito
In this study, we delineated the importance of MS resolving power on the ion-peak quantification of lipids using an Orbitrap Fusion instrument and established a liquid chromatography-based, high-performance lipidomics platform. The ion-peak recognition of several lipids in human plasma, such as LPC(15:0), LPE(22:5), and PC(35:0), was clearly improved by increasing the MS resolving power. In addition, we evaluated the impact of resolving power on the quantitative detection of lipids by automatic ion-peak recognition with calculation of the coefficient of variance (CV)...
April 13, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28437716/development-of-a-derivatization-method-for-the-quantification-of-hydrogen-sulfide-and-its-application-in-vascular-calcification-rats
#4
Xiao-Xin Tan, Kao-Qi Lian, Xiang Li, Nan Li, Wei Wang, Wei-Jun Kang, Hong-Mei Shi
Hydrogen sulfide (H2S) plays major functional and structural roles in diverse physiological functions and the pathogenesis of a variety of disorders in biological matrices. The significance of H2S has prompted the development of sensitive and selective methods to determine its concentration in biological samples. The fluorescent reagent monobromobimane (MBB) has been widely used to measure various thiol-containing species through alkylation. MBB may prevent the oxidation of sulfide and the reaction of sulfide with several different species (such as superoxide radicals, hydrogen peroxide and peroxynitrite)...
April 13, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28419925/characterization-and-application-of-restricted-access-carbon-nanotubes-in-online-extraction-of-anticonvulsant-drugs-from-plasma-samples-followed-by-liquid-chromatography-analysis
#5
Rodrigo Campos Dos Santos, Adriana Kaori Kakazu, Mariane Gonçalves Santos, Fábio Antônio Belinelli Silva, Eduardo Costa Figueiredo
Anticonvulsant drugs are often used in the treatment of epilepsy. However, their therapeutic monitoring is often necessary in order to obtain an appropriate dose adjustment, due to the proximity between their therapeutic and toxic ranges. The aim of this study was to carry out the synthesis, characterization and use of restricted access carbon nanotubes (RACNTs) in an online method for the analyses of phenobarbital and carbamazepine and primidone from untreated human blood plasma by column switching liquid chromatography...
April 11, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28426993/a-new-combined-method-of-stable-isotope-labeling-derivatization-ultrasound-assisted-dispersive-liquid-liquid-microextraction-for-the-determination-of-neurotransmitters-in-rat-brain-microdialysates-by-ultra-high-performance-liquid-chromatography-tandem-mass
#6
Longfang Zheng, Xian-En Zhao, Shuyun Zhu, Yanduo Tao, Wenhua Ji, Yanling Geng, Xiao Wang, Guang Chen, Jinmao You
In this work, for the first time, a new hyphenated technique of stable isotope-labeling derivatization-ultrasound-assisted dispersive liquid-liquid microextraction has been developed for the simultaneous determination of monoamine neurotransmitters (MANTs) and their biosynthesis precursors and metabolites. The developed method was based on ultra high performance liquid chromatography tandem mass spectrometry detection using multiple-reaction monitoring mode. A pair of mass spectrometry sensitizing reagents, d0-10-methyl-acridone-2-sulfonyl chloride and d3-10-methyl-acridone-2-sulfonyl chloride, as stable isotope probes was utilized to facilely label neurotransmitters, respectively...
April 10, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28419926/stability-and-activity-of-immobilized-trypsin-on-carboxymethyl-chitosan-functionalized-magnetic-nanoparticles-cross-linked-with-carbodiimide-and-glutaraldehyde
#7
Jun Sun, Lin Yang, Mengmeng Jiang, Yu Shi, Bin Xu, Hai-le Ma
Enzyme cross-linkers, such as 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) and glutaraldehyde (GA), have been used to improve the stability of immobilized enzymes. We have developed a relatively stable and high-activity immobilized trypsin through EDC and GA cross-linking. Carboxymethyl chitosan (CM-CTS)-functionalized magnetic nanoparticles (Fe3O4@CM-CTS) were prepared, and characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis, X-ray diffraction, and transmission electron microscopy...
April 10, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28415021/in-vitro-investigation-of-metabolic-profiling-of-a-potent-topoisomerase-inhibitors-fluorescein-hydrazones-flhs-in-rlms-by-lc-ms-ms
#8
A F M Motiur Rahman, Nasser S Al-Shakliah, Wencui Yin, Adnan A Kadi
Metabolic profiling of newly reported two topoisomerase inhibitors namely fluorescein hydrazones (FLHs) were studied in rat liver microsomes (RLMs) and the data were acquired in a liquid chromatography (LC) ion trap mass spectrometry. (E)-3',6'-dihydroxy-2-((2-nitrobenzylidene)amino)spiro[isoindoline-1,9'-xanthen]-3-one (1) was bio-transformed into two mono-hydroxylated, one double hydroxylated and a tetra hydroxylated metabolites, on the other hand, (Z)-3',6'-dihydroxy-2-((2-oxoindolin-3-ylidene)amino)spiro[isoindoline-1,9'-xanthen]-3-one (2) was bio-transformed into eight possible metabolites by cleavage reduction, hydroxylation, cleavage reduction together with hydroxylated and azo-reduction in RLMs in presence of NADPH-generating system...
April 10, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28419924/centrifugal-partition-chromatography-in-the-isolation-of-minor-ecdysteroids-from-cyanotis-arachnoidea
#9
Halima Meriem Issaadi, Yu-Chi Tsai, Fang-Rong Chang, Attila Hunyadi
Phytoecdysteroids are known for their various beneficial bioactivities in mammals including a non-hormonal anabolic and adaptogenic effect. Cyanotis arachnoidea extracts are extensively utilized worldwide as ecdysteroid-rich materials for various purposes, e.g. food supplementation, use in agriculture and aquaculture, etc. Preparative chromatography of ecdysteroids requires extensive use of methods of different selectivity, and only a very limited number of papers are available on related application of modern liquid-liquid chromatographic techniques...
April 8, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28415019/recovery-of-infective-virus-particles-in-ion-exchange-and-hydrophobic-interaction-monolith-chromatography-is-influenced-by-particle-charge-and-total-to-infective-particle-ratio
#10
Dora Sviben, Dubravko Forcic, Jelena Ivancic-Jelecki, Beata Halassy, Marija Brgles
Viral particles are used in medical applications as vaccines or gene therapy vectors. In order to obtain product of high purity, potency and safety for medical use purification of virus particles is a prerequisite, and chromatography is gaining increased attention to meet this aim. Here, we report on the use of ion-exchange and hydrophobic interaction chromatography on monolithic columns for purification of mumps virus (MuV) and measles virus (MeV). Efficiency of the process was monitored by quantification of infective virus particles (by 50% cell culture infective dose assay) and total virus particles, and monitoring of their size (by Nanoparticle Tracking Analysis)...
April 8, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28433551/in-vitro-investigation-of-metabolic-profiling-of-newly-developed-topoisomerase-inhibitors-ethyl-fluorescein-hydrazones-etflhs-in-rlms-by-lc-ms-ms
#11
Adnan A Kadi, Nasser S Al-Shakliah, Wencui Yin, A F M Motiur Rahman
Metabolic profiling of newly reported five topoisomerase inhibitors namely ethyl fluorescein hydrazones (EtFLHs) were studied in rat liver microsomes (RLMs) and the data were acquired in a liquid chromatography (LC) ion trap mass spectrometry. Hydroxyl group containing EtFLHs derivatives (1-3) were bio-transformed into hydrolyzed, mono-hydroxylated and hydrolyzed together with mono-hydroxylated metabolites. On the other hand, nitro and methoxy groups containing EtFLHs derivatives (4-5) were bio-transformed into hydrolyzed, hydrolyzed together with mono-hydroxylated and azo-reductive metabolites in the presence of NADPH...
April 6, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28411463/simultaneous-separation-of-taxon-specific-crystallins-from-mule-duck-and-characterization-of-their-enzymatic-activities-and-structures
#12
Chih-Hsien Wang, Chia-Chi Huang, Wenlung Chen
Methods to obtain pure proteins in large amounts are indispensible in protein research. We report here a large-scale/simultaneous isolation of taxon-specific crystallins (ɛ- and δ-crystallin) from the eye lenses of Mule duck. We also investigate the compositions, enzymatic activities, and structures of these purified taxon-specific proteins. A relatively mild method of ion-exchange chromatography was developed to fractionate ɛ-crystallin and δ-crystallin in large amount, ca. ∼6.60mg/g-lens and ∼41.0mg/g-lens, respectively...
April 6, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28415022/simultaneous-determination-of-tryptophan-and-8-metabolites-in-human-plasma-by-liquid-chromatography-tandem-mass-spectrometry
#13
Lysiane Boulet, Patrice Faure, Patrice Flore, Julien Montérémal, Véronique Ducros
Tryptophan (Trp) is an essential amino-acid and the precursor of many biologically active substances such as kynurenine (KYN) and serotonin (5HT). Its metabolism is involved in different physiopathological states, such as cardiovascular diseases, cancer, immunomodulation or depression. Hence, the quantification of Trp catabolites, from both KYN and 5HT pathways, might be usefulfor the discovery of novel diagnostic and follow-up biomarkers. We have developed a simple method for quantification of Trp and 8 of its metabolites,involved in both KYN and 5HT pathways, using liquid chromatography coupled to tandem mass spectrometry...
April 4, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28407533/determination-of-brusatol-in-plasma-and-tissues-by-lc-ms-method-and-its-application-to-a-pharmacokinetic-and-distribution-study-in-mice
#14
Nan Guo, Xiaoran Zhang, Fanlong Bu, Lei Wang, Zhanqi Cao, Chunmei Geng, Ruichen Guo, Dongmei Ren, Qing Wen
OBJECTIVES: The quassinoid brusatol, which can be isolated from Brucea javanica (L.) Merr., becomes popularly studied because of its anti-tumor activity. In order to further investigate brusatol and extend its applications, a sensitive analytical method for determination of brusatol in biological samples is essential. However, few methods had been reported until now. In this study, a highly sensitive and reproducible LC-MS method for simultaneous quantification of brusatol in mouse plasma and tissues was developed and validated...
April 4, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28407532/rational-approach-to-solvent-system-selection-for-liquid-liquid-extraction-assisted-sample-pretreatment-in-counter-current-chromatography
#15
Jiajia Wang, Dongyu Gu, Miao Wang, Xinfeng Guo, Haoquan Li, Yue Dong, Hong Guo, Yi Wang, Mengqi Fan, Yi Yang
A rational liquid-liquid extraction approach was established to pre-treat samples for high-speed counter-current chromatography (HSCCC). n-Hexane-ethyl acetate-methanol-water (4:5:4:5, v/v) and (1:5:1:5, v/v) were selected as solvent systems for liquid-liquid extraction by systematically screening K of target compounds to remove low- and high-polarity impurities in the sample, respectively. After liquid-liquid extraction was performed, 1.4g of crude sample II was obtained from 18.5g of crude sample I which was extracted from the flowers of Robinia pseudoacacia L...
April 4, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28399467/ultrasound-assisted-low-density-solvent-dispersive-liquid-liquid-microextraction-for-the-determination-of-4-designer-benzodiazepines-in-urine-samples-by-gas-chromatography-triple-quadrupole-mass-spectrometry
#16
Liang Meng, Binling Zhu, Kefang Zheng, Shanlin Fu
A novel microextraction technique based on ultrasound-assisted low-density solvent dispersive liquid-liquid microextraction (UA-LDS-DLLME) had been applied for the determination of 4 designer benzodiazepines (phenazepam, diclazepam, flubromazepam and etizolam) in urine samples by gas chromatography- triple quadrupole mass spectrometry (GC-QQQ-MS). Ethyl acetate (168μL) was added into the urine samples after adjusting pH to 11.3. The samples were sonicated in an ultrasonic bath for 5.5min to form a cloudy suspension...
April 4, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28433865/high-sensitivity-hplc-method-for-analysis-of-in-vivo-extracellular-gaba-using-optimized-fluorescence-parameters-for-o-phthalaldehyde-opa-sulfite-derivatives
#17
Shannon L Zandy, James M Doherty, Nathan D Wibisono, Rueben A Gonzales
Reversed-phase HPLC with derivatization using o-phthalaldehyde (OPA) and sulfite allows electrochemical detection of γ-aminobutyric acid (GABA) in microdialysis samples. However, OPA/sulfite derivatives have been reported to produce lower fluorescent yield than OPA derivatives using organic thiols as the nucleophile. To overcome this limitation we examined excitation and emission spectra, reaction time, pH, and concentration of reagents in the derivatization solution. Optimal detection parameters were determined as λex=220nm and λem=385nm for maximal fluorescence...
April 3, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28432922/restricted-access-magnetic-core-mesoporous-shell-microspheres-with-c8-modified-interior-pore-walls-for-the-identification-of-20-s-protopanaxadiol-metabolites-in-rat-plasma-using-uplc-q-tof-ms-ms
#18
Jin Ling, Yingjia Yu, Jianan Feng, Changjiang Xu, Jiebing Jiang, Liping Wang, Jiakun Long, Yan Li, Gengli Duan
In the present study, a novel sample preparation method based on magnetic core-mesoporous shell microspheres with C8-modified interior pore walls (C8-Fe3O4@mSiO2) was established for the identification of 20(S)-protopanaxadiol (PPD) metabolites in rat plasma by UPLC-Q-TOF-MS/MS analysis. C8-Fe3O4@mSiO2 allowed selective extraction of PPD metabolites from rat plasma by excluding macromolecules in the plasma owing to size exclusion effect. Five extraction conditions including the amount of C8-Fe3O4@mSiO2 microspheres used, extraction time, elution solvents, elution volume, and elution time were investigated and optimized...
April 3, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28412665/quantitation-of-levodopa-and-carbidopa-in-rat-plasma-by-lc-ms-ms-the-key-role-of-ion-pairing-reversed-phase-chromatography
#19
Jingduan Chi, Yonghua Ling, Rand Jenkins, Fumin Li
A simple and selective bioanalytical method was developed for simultaneous determination of levodopa and carbidopa in rat plasma by LC-MS/MS. Levodopa and carbidopa are small polar molecules, posing challenges in the development of selective and efficient chromatography conditions. Perfluoropentanoic acid (PFPA), a volatile ion-pairing agent, was utilized to enhance chromatographic characteristics of both compounds in the reversed-phase mechanism. The ion-pairing chromatography played an essential role in mitigating matrix effects and achieving adequate separation between interfering background peaks and those of the analytes of interest, especially for levodopa...
April 3, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28411465/simultaneous-and-multi-point-measurement-of-ammonia-emanating-from-human-skin-surface-for-the-estimation-of-whole-body-dermal-emission-rate
#20
Shota Furukawa, Yoshika Sekine, Keita Kimura, Kazuo Umezawa, Satomi Asai, Hayato Miyachi
Ammonia is one of the members of odor gases and a possible source of odor in indoor environment. However, little has been known on the actual emission rate of ammonia from the human skin surface. Then, this study aimed to estimate the whole-body dermal emission rate of ammonia by simultaneous and multi-point measurement of emission fluxes of ammonia employing a passive flux sampler - ion chromatography system. Firstly, the emission fluxes of ammonia were non-invasively measured for ten volunteers at 13 sampling positions set in 13 anatomical regions classified by Kurazumi et al...
April 2, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
journal
journal
40108
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"