journal
MENU ▼
Read by QxMD icon Read
search

Journal of Chromatographic Science

journal
https://www.readbyqxmd.com/read/29140426/development-and-validation-of-stereo-selective-method-for-the-separation-of-razoxane-enantiomers-in-hydrophilic-interaction-chromatography
#1
Ch Thirupathi, K Nagesh Kumar, G Srinivasu, Ch Lakshmi Narayana, Ch Parameswara Murthy
A novel sensitive and high throughput chiral hydrophilic interaction chromatographic (HILIC) method was developed to separate razoxane enantiomers namely levrazoxane (R-isomer) and dexrazoxane (DEX) in pharmaceutical active ingredient samples. A systematic chiral chromatographic screening system was employed in using multiple HPLC chromatographic modes on various polysaccharide based chiral columns to obtain a potential separation between enantiomers. HPLC separation was achieved using a mobile phase of aqueous 10 mM ammonium bicarbonate and mixture of organic modifiers (70/30, v/v) in the ratio of (5/95, v/v) on an immobilized polysaccharide based chiral stationary phase namely CHIRALPAK IE-3...
November 13, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29140413/comparison-of-chemical-constituents-in-scrophulariae-radix-processed-by-different-methods-based-on-uflc-ms-combined-with-multivariate-statistical-analysis
#2
Shengnan Wang, Yujiao Hua, Lisi Zou, Xunhong Liu, Ying Yan, Hui Zhao, Yiyuan Luo, Juanxiu Liu
Scrophulariae Radix is one of the most popular traditional Chinese medicines (TCMs). Primary processing of Scrophulariae Radix is an important link which closely related to the quality of products in this TCM. The aim of this study is to explore the influence of different processing methods on chemical constituents in Scrophulariae Radix. The difference of chemical constituents in Scrophulariae Radix processed by different methods was analyzed by using ultra fast liquid chromatography-triple quadrupole-time of flight mass spectrometry coupled with principal component analysis and orthogonal partial least squares discriminant analysis...
November 13, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29069353/concurrent-lactic-and-volatile-fatty-acid-analysis-of-microbial-fermentation-samples-by-gas-chromatography-with-heat-pre-treatment
#3
Darwin, WipaCharles, Ralf Cord-Ruwisch
Organic acid analysis of fermentation samples can be readily achieved by gas chromatography (GC), which detects volatile organic acids. However, lactic acid, a key fermentation acid is non-volatile and can hence not be quantified by regular GC analysis. However the addition of periodic acid to organic acid samples has been shown to enable lactic acid analysis by GC, as periodic acid oxidizes lactic acid to the volatile acetaldehyde. Direct GC injection of lactic acid standards and periodic acid generated inconsistent and irreproducible peaks, possibly due to incomplete lactic acid oxidation to acetaldehyde...
October 23, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29069326/a-rapid-and-simple-hplc-method-for-therapeutic-monitoring-of-vancomycin
#4
Tácio de Mendonça Lima, Karine Souza Seba, José Carlos Saraiva Gonçalves, Fernando Luiz Lopes Cardoso, Rita de Cássia Elias Estrela
Therapeutic monitoring of the antibiotic vancomycin is important to achieve specific plasma concentration and prevent toxic effects. Several assays have been described for vancomycin determination in clinical practice, but high-performance liquid chromatography is still considered the gold standard for the quantification of vancomycin. In this study, we developed a new and rapid high-performance liquid chromatography method requiring 50 μL of plasma for the quantification of vancomycin. Acetonitrile was used for processing plasma by protein precipitation (1:2...
October 23, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29069322/rapid-determination-of-non-steroidal-anti-inflammatory-drugs-in-aquatic-matrices-by-two-phase-micro-electrodriven-membrane-extraction-combined-with-liquid-chromatography
#5
Nor Suhaila Mohamad Hanapi, Mohd Marsin Sanagi, Abd Khamim Ismail, Nor'ashikin Saim, Wan Nazihah Wan Ibrahim, Wan Aini Wan Ibrahim, Faridah Mohd Marsin
Two-phase micro-electrodriven membrane extraction (EME) procedure for the pre-concentration of selected non-steroidal anti-inflammatory drugs (NSAIDs) in aquatic matrices was investigated. Agarose film was used as interface between donor and acceptor phase in EME which allowed for selective extraction of the analytes prior to high performance liquid chromatography-ultraviolet detection. Charged analytes were transported from basic aqueous sample solution through agarose film into 1-octanol as an acceptor phase at 9 V potential...
October 23, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29045620/determination-and-pharmacokinetics-of-wga-in-rat-plasma-by-lc-ms-after-oral-administration-of-xanthoceras-sorbifolia-bunge-extract
#6
Junhong Ling, Nan Wang, Shaoning Wang, Yingchun Liu, Dandan Xia, Kaishun Bi
3-O-(3-O-angeloyl-6-O-β-D-glucopyranosyl)-β-D-glucopyranosyl-28-O-(2-α-L-rhamnopyranosyl-6-O-β-D-glucopyranosyl)-β-D-glucopyranosyl-16-deoxybarringtogenol A (WGA) is a potential anti-AD (Alzheimer's disease) active compound isolated from the husks of Xanthoceras sorbifolia Bunge. A rapid and accurate high-performance liquid chromatography-mass spectrometry (LC-MS) method was developed and validated for the quantification of WGA in rat plasma. Digoxin was used as internal standard (IS). Sample preparation was performed by liquid-liquid extraction using ethyl acetate-isopropanol (1:1, v/v)...
October 17, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29045617/purification-of-four-flavonoid-glycosides-from-lotus-nelumbo-nucifera-gaertn-plumule-by-macroporous-resin-combined-with-hsccc
#7
Lei Wu, Wei Xiong, Ju-Wu Hu, Zhen Gu, Jian-Guo Xu, Chuan-Ling Si, Young-Soo Bae, Gang Xu
High-speed counter-current chromatography (HSCCC) combined with macroporous resin (MR) column was successfully applied to the isolation and purification of four flavonoid glycosides from the medicinal herb Lotus plumule (LP). A polar two-phase solvent system composed of ethyl acetate-n-butanol-water (1:2:3, v/v/v) was selected by high-performance liquid chromatography (HPLC) and run on a preparative scale where the lower aqueous phase was used as the mobile phase with a head-to-tail elution mode. Quercetin-3-O-β-D-glucopyranoside (15 mg), isorhamnetin-3-O-β-D-glucopyranoside (13 mg), apigenin 6-C-β-D-glucopyranosyl-8-C-α-L-arabinopyranoside (18 mg) and apigenin 6,8-di-C-β-D-glucopyranoside (48 mg) were obtained in a one-step HSCCC separation from 240 mg of the sample...
October 17, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29045600/development-and-validation-of-a-stability-indicating-reversed-phase-uplc-uv-method-for-the-assay-of-imidacloprid-and-estimation-of-its-related-compounds
#8
Jingzhi Tian, Abu Rustum
Imidacloprid is used as an active pharmaceutical ingredient (API) in veterinary drugs to control fleas and ticks for dogs and cats. Here we are reporting for the first time a validated stability-indicating reversed-phase UPLC-UV method for the assay of imidacloprid and estimation of its related compounds. The stability-indicating capability of this method has been demonstrated by a forced degradation study. All related compounds including processing impurities, imidacloprid API and degradates from stressed samples were well separated from each other...
October 17, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29036589/simultaneous-determination-of-11-high-polarity-components-from-fructus-corni-a-quantitative-lc-ms-ms-method-for-improved-quality-control
#9
Liling Wang, Hui Chen, Yuhong Jiang, Zhihui Liu, Qiong Wang, Xiao Zheng
Fructus Corni, the dried ripe sarcocarp of Cornus officinalis Sieb.et Zucc (Cornaceae), is widely used in traditional medicine. Pharmacological studies to date have attributed many biological effects to the high-polarity components. However, current quality control methods focus on only several iridoid glycoside components, and, of note, there is no comprehensive method available to simultaneously quantify the high-polarity components in Fructus Corni. Here, a simple, sensitive and robust liquid chromatography-electrospray ionization-tandem mass spectrometry method was developed to simultaneously determine 11 high-polarity constituents (5-hydroxymethyl-2-furfural, gallic acid, sweroside, cornin, loganin, morroniside, 7α-O-methylmorroniside, 7β-O-methylmorroniside, 7α-O-ethylmorroniside and 7β-O-ethylmorroniside, cornuside) of Fructus Corni...
September 28, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29036301/the-content-analysis-of-gastrodin-and-gastrodigenin-obtained-by-different-processing-methods
#10
Yang Liu, Gangliang Huang
The purpose of this article was to investigate the effects of different processing methods on the content of gastrodin and gastrodigenin in Gastrodia elata Blume, so as to obtain the best processing method of G. elata. The contents of gastrodin and gastrodigenin in the samples were determined by HPLC method in turn. The results showed that the content of gastrodin and gastrodigenin were the highest in the sample obtained by extraction with 50% ethanol after boiling. Therefore, according to the two indexes of gastrodin and gastrodigenin, alcohol extraction after boiling was the best processing method, which could provide the reference for production...
September 28, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28977354/thin-layer-chromatographic-resolution-of-some-%C3%AE-adrenolytics-and-a-%C3%AE-2-agonist-using-bovine-serum-albumin-as-chiral-additive-in-stationary-phase
#11
Poonam Malik, Ravi Bhushan
Direct enantiomeric resolution of commonly used five racemic β-adrenolytics, namely, bisoprolol, atenolol, propranolol, salbutamol and carvedilol has been achieved by thin layer chromatography using bovine serum albumin (BSA) as chiral additive in stationary phase. Successful resolution of the enantiomers of all racemic β-adrenolytics was achieved by use of different composition of simple organic solvents having no buffer or inorganic ions. The effect of variation in pH, temperature, amount of BSA as the additive, and composition of mobile phase on resolution was systematically studied...
September 15, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28977351/novel-validated-hptlc-method-for-the-analysis-of-two-binary-mixtures-containing-tamsulosin-hydrochloride-with-antimuscarinic-agents
#12
Eman I El-Kimary, Essam F Khamis, Saeid F Belal, Mona M Abdel Moneim
A validated and selective high-performance thin-layer chromatography (HPTLC) method was developed for the analysis of mixures of tamsulosin hydrochloride (TAM) with either tolterodine tartrate (TOL) or solifenacin succinate (SOL) in bulk drug and in combined dosage forms. The proposed method is based on HPTLC separation of the three drugs followed by densitometric measurements of their spots at 224 nm. Separation was carried out on Merck HPTLC aluminum sheets of silica gel 60 F254 using ethyl acetate-methanol-ammonia (6:4:0...
September 11, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28977618/chemometric-assessment-of-chromatographic-methods-for-herbal-medicines-authentication-and-fingerprinting
#13
Ioana Anamaria Sima, Melinda Andrási, Costel Sârbu
Nowadays, increasingly more individuals turn to supplementation of the diet with herbal medicines and many such products are marketed lately. Thus the problem that this article focuses on is that these products are not subjected to rigorous quality control like synthetic drugs are, which rises a constant debate whether the supplements actually contain the herb or mixture of herbs that the manufacturer claims they do. As a solution, micellar electrokinetic chromatography and high performance liquid chromatography were investigated in order to fingerprint and authenticate herbal medicines...
September 7, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28977348/isolation-of-flavonoids-from-wild-aquilaria-sinensis-leaves-by-an-improved-preparative-high-speed-counter-current-chromatography-apparatus
#14
Mao-Xun Yang, Yao-Guang Liang, He-Ru Chen, Yong-Fang Huang, Hai-Guang Gong, Tian-You Zhang, Yoichiro Ito
Four flavonoids including apigenin-7,4'-dimethylether, genkwanin, quercetin, and kaempferol were isolated in a preparative or semi-preparative scale from the leaves of wild Aquilaria sinensis using an improved preparative high-speed counter-current chromatography apparatus. The separations were performed with a two-phase solvent system composed of hexane-ethyl acetate, methanol-water at suitable volume ratios. The obtained fractions were analyzed by HPLC, and the identification of each target compound was carried out by ESI-MS and NMR...
September 5, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28977419/uplc-orbitrap-hrms-analysis-of-panax-quinquefolium-l-for-authentication-of-panax-genus-with-chemometric-methods
#15
Xin Huang, Yan Liu, Nan Zhang, Xiuli Sun, Hao Yue, Changbao Chen, Shuying Liu
Ginsenosides in Panax quinquefolium L. were determined using developed ultra-performance liquid chromatography coupled to high resolution mass spectrometry (UPLC-HRMS) method with electrospray ionization and orbitrap MS analyzer in negative ionization mode. Optimal UPLC separation was achieved using a mixture of acetonitrile and water with 0.1% formic acid as the mobile phase in linear gradient elution. The MS parameters were optimized for reliable detection with enhanced selectivity and sensitivity, and improved identification and quantification of ginsenosides...
August 31, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28977346/chemical-fingerprint-and-quantitative-analysis-for-the-quality-evaluation-of-platycladi-cacumen-by-ultra-performance-liquid-chromatography-coupled-with-hierarchical-cluster-analysis
#16
Mingqiu Shan, Sam Fong Yau Li, Sheng Yu, Yan Qian, Shuchen Guo, Li Zhang, Anwei Ding
Platycladi cacumen (dried twigs and leaves of Platycladus orientalis (L.) Franco) is a frequently utilized Chinese medicinal herb. To evaluate the quality of the phytomedcine, an ultra-performance liquid chromatographic method with diode array detection was established for chemical fingerprinting and quantitative analysis. In this study, 27 batches of P. cacumen from different regions were collected for analysis. A chemical fingerprint with 20 common peaks was obtained using Similarity Evaluation System for Chromatographic Fingerprint of Traditional Chinese Medicine (Version 2004A)...
August 31, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28977362/stability-indicating-reversed-phase-uhplc-method-development-and-characterization-of-degradation-products-of-almotriptan-maleate-by-lc-qtof-ms-ms
#17
B Saibaba, Ch Vishnuvardhan, P Johnsi Rani, N Satheesh Kumar
Almotriptan maleate (ALMT), a highly selective 5-hydroxy tryptamine 1B/1D (5-HT1B/1D) receptor agonist used in the treatment of migraine headache was subjected to various ICH (Q1A (R2)) specified guidelines. The drug underwent significant degradation under hydrolytic (acid, base and neutral), oxidative and photolytic stress conditions, while it was stable under thermal stress condition. A total of seven significant degradation products (DPs) were obtained. A simple, selective and reliable UPLC method has been developed for the separation of ALMT and its DPs using Acquity UPLC HSS Cyano (100 × 2...
August 30, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28977474/development-of-an-analytical-method-for-the-determination-of-amoxicillin-in-commercial-drugs-and-wastewater-samples-and-assessing-its-stability-in-simulated-gastric-digestion
#18
Tugçe Unutkan, Sezgin Bakirdere, Seyfullah Keyf
A highly sensitive analytical HPLC-UV method was developed for the determination of amoxicillin in drugs and wastewater samples at a single wavelength (230 nm). In order to substantially predict the in vivo behavior of amoxicillin, drug samples were subjected to simulated gastric conditions. The calibration plot of the method was linear from 0.050 to 500 mg L-1 with a correlation coefficient of 0.9999. The limit of detection and limit of quantitation were found to be 16 and 54 μg L-1, respectively. The percentage recovery of amoxicillin in wastewater was found to be 97...
August 28, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28985412/validated-chromatographic-methods-for-the-simultaneous-determination-of-sulfacetamide-sodium-and-prednisolone-acetate-in-their-ophthalmic-suspension
#19
Nariman A El-Ragehy, Maha A Hegazy, G AbdElHamid, Samia A Tawfik
Two specific, sensitive, rapid and accurate chromatographic methods have been developed, optimized and validated for the simultaneous determination of sulfacetamide sodium and prednisolone acetate in pure forms and in their binary mixture. The first method is an isocratic Reversed phase-high performance liquid chromatography method where a rapid separation was achieved on a Zorbax ODS column using a green mobile phase of methanol: water (80:20, v/v) and pH adjusted to 5.0 ± 0.2 with orthophosphoric acid. The retention times (tR) were 2...
November 1, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28985280/liquid-chromatographic-chiral-separation-of-acenocoumarol-and-its-hemiketal-form
#20
Aicha Kraimi, Nasser Belboukhari, Khaled Sekkoum, Abdelkrim Cheriti, Hassan Y Aboul-Enein
Acenocoumarol, an anticoagulant drug, was separated successfully using polysaccharide-based chiral stationary phases columns namely Cellulose Chiralpak® IB and Chiralcel® OD, using various normal mobile phases by high-performance liquid chromatography. However, the appearance of four well separated peaks confirmed the presence of the hemiketal form of 4-hydroxy-3-[1-(4-nitrophenyl)-3-oxobutyl]-2H-chromen-2-one.
November 1, 2017: Journal of Chromatographic Science
journal
journal
22058
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"