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High performance liquid chromatography

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https://www.readbyqxmd.com/read/29145087/retention-performance-of-three-widely-used-spe-sorbents-for-the-extraction-of-perfluoroalkyl-substances-from-seawater
#1
Miroslav Brumovský, Jitka Bečanová, Pavlína Karásková, Luca Nizzetto
Some per- and polyfluoroalkyl substances (PFASs) have been detected ubiquitously in the environment. Owing to the polar character conferred by the presence of the carboxylic or sulfonic acid groups and their resistance to degradation, aquatic environments became their major reservoirs, including marine waters. The procedure of PFAS analysis in aqueous matrices consists usually of solid-phase extraction (SPE) followed by high-performance liquid chromatography coupled to tandem mass spectrometry. Moreover, passive sampling approach using various SPE sorbents may be applied...
November 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/29144957/fluconazole-levels-in-serum-and-cerebrospinal-fluid-according-to-daily-dosage-in-patients-with-cryptococcosis-and-other-fungal-infections
#2
Letícia Aparecida Schiave, Erika Nascimento, Fernando Crivelenti Vilar, Tissiana Marques de Haes, Osvaldo Massaiti Takayanagui, Cristiane Masetto de Gaitani, Roberto Martinez
Fluconazole is extensively used for the treatment of candidiasis and cryptococcosis. Among other factors, successful treatment is related to appropriate fluconazole levels in blood and cerebrospinal fluid (CSF). In the present study, fluconazole levels were determined in 15 patients, 14 of whom had AIDS and 13 had neurocryptococcosis. The only selection criterion was treatment with fluconazole, which was performed with a generic or similar form of the drug. Fluconazole level was determined by high performance liquid chromatography and the susceptibility profile of Cryptococcus spp...
November 13, 2017: Brazilian Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29144587/characterization-of-complex-heterogeneous-lipid-a-samples-using-hplc-ms-ms-technique-iii-positive-ion-mode-tandem-mass-spectrometry-to-reveal-phosphorylation-and-acylation-patterns-of-lipid-a
#3
Viktor Sándor, Anikó Kilár, Ferenc Kilár, Béla Kocsis, Ágnes Dörnyei
In this study, we report the detailed analysis of the fragmentation patterns of positively charged lipid A species based on their tandem mass spectra obtained under low-energy collision-induced dissociation conditions of an electrospray quadrupole time-of-flight mass spectrometers. The tandem mass spectrometry experiments were performed after the separation of the compounds with a reversed-phase high performance liquid chromatography method. We found that both, phosphorylated and nonphosphorylated lipid A molecules can be readily ionized in the positive-ion mode by adduct formation with triethylamine added to the eluent...
November 16, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/29144552/simultaneous-determination-of-tilianin-and-its-metabolites-in-mice-using-ultra-high-performance-liquid-chromatography-with-tandem-mass-spectrometry-and-its-application-to-a-pharmacokinetic-study
#4
Liping Wang, Qingwei Chen, Lijun Zhu, Xuejun Zeng, Qiang Li, Ming Hu, Xinchun Wang, Zhongqiu Liu
Tilianin is an active flavonoid glycoside found in many medical plants. Data are lacking regarding its pharmacokinetics and disposition in vivo. The objective of this study was to develop a sensitive, reliable, and validated ultra-high-performance liquid chromatography with tandem mass spectrometry (UHPLC-MS/MS) method to simultaneously quantify tilianin and its main metabolites and to determine its pharmacokinetics in wild-type and breast cancer resistance protein knockout (Bcrp1-/-) FVB mice. Chromatographic separation was accomplished on a C18 column by utilizing acetonitrile and 0...
November 16, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29144423/lipid-peroxidation-process-in-meat-and-meat-products-a-comparison-study-of-malondialdehyde-determination-between-modified-2-thiobarbituric-acid-spectrophotometric-method-and-reverse-phase-high-performance-liquid-chromatography
#5
Anna Reitznerová, Monika Šuleková, Jozef Nagy, Slavomír Marcinčák, Boris Semjon, Milan Čertík, Tatiana Klempová
The aim of this work was to compare the methods of malondialdehyde detection, as the main secondary product of the lipid peroxidation process, in meat and meat products. Malondialdehyde measurements were performed by two modified methods, the 2-thiobarbituric acid spectrophotometric method and the reverse-phase high-performance liquid chromatography in raw, mechanically-deboned chicken meat and in manufactured frankfurters. The malondialdehyde concentrations measured by the 2-thiobarbituric acid spectrophotometric method were found to be overestimated by more than 25% in raw meat and more than 27% in frankfurters in comparison to the results of reverse-phase high-performance liquid chromatography (p < 0...
November 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29144421/paralytic-shellfish-toxins-and-cyanotoxins-in-the-mediterranean-new-data-from-sardinia-and-sicily-italy
#6
Antonella Lugliè, Maria Grazia Giacobbe, Elena Riccardi, Milena Bruno, Silvia Pigozzi, Maria Antonietta Mariani, Cecilia Teodora Satta, Daniela Stacca, Anna Maria Bazzoni, Tiziana Caddeo, Pasqualina Farina, Bachisio Mario Padedda, Silvia Pulina, Nicola Sechi, Anna Milandri
Harmful algal blooms represent a severe issue worldwide. They affect ecosystem functions and related services and goods, with consequences on human health and socio-economic activities. This study reports new data on paralytic shellfish toxins (PSTs) from Sardinia and Sicily (Italy), the largest Mediterranean islands where toxic events, mainly caused by Alexandrium species (Dinophyceae), have been ascertained in mussel farms since the 2000s. The toxicity of the A. minutum, A. tamarense and A. pacificum strains, established from the isolation of vegetative cells and resting cysts, was determined by high performance liquid chromatography (HPLC)...
November 16, 2017: Microorganisms
https://www.readbyqxmd.com/read/29143793/marrubium-vulgare-l-leave-extract-phytochemical-composition-antioxidant-and-wound-healing-properties
#7
Bédis Amri, Emanuela Martino, Francesca Vitulo, Federica Corana, Leila Bettaieb-Ben Kaâb, Marta Rui, Daniela Rossi, Michela Mori, Silvia Rossi, Simona Collina
Several factors contribute in wound generation, e.g., accidental traumas or surgery, and in certain cases, this dermal injury may have a devastating outcome. When skin damage occurs, the human body puts in place a sophisticated choreography, which involves numerous repairing processes to restore physiological conditions. Nevertheless, natural healing mechanisms are ineffective towards chronic or non-healing wounds and thus, therapeutic strategies may represent the only beneficial alternative to counteract these tissue insults...
October 28, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29143757/simultaneous-determination-of-seven-anthraquinone-aglycones-of-crude-and-processed-semen-cassiae-extracts-in-rat-plasma-by-uplc-ms-ms-and-its-application-to-a-comparative-pharmacokinetic-study
#8
Rixin Guo, Hongwei Wu, Xiankuo Yu, Mengying Xu, Xiao Zhang, Liying Tang, Zhuju Wang
Semen cassiae is the ripe seed of Cassia obtusifolia L. or Cassia tora L. of the family Leguminosae. In traditional Chinese medicine, the two forms of Semen cassiae are raw Semen cassiae (R-SC) and parched Semen cassiae (P-SC). To clarify the processing mechanism of Semen cassiae, the pharmacokinetics of R-SC and P-SC extracts were examined. A simple, rapid, sensitive ultra-high-performance liquid chromatography-tandem mass spectroscopy (UPLC-MS/MS) method was developed and validated for the simultaneous determination of seven anthraquinone aglycones of Semen cassiae (aurantio-obtusin, obtusifolin, questin, 2-hydroxyemodin-1-methyl-ether, rhein, emodin, 1,2,7-trimethoxyl-6,8-dihydroxy-3-methylanthraquinone) to compare the pharmacokinetics of raw and parched Semen cassiae in rat plasma...
October 28, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29143552/metabonomics-analysis-of-serum-from-rats-given-long-term-and-low-level-cadmium-by-ultra-performance-liquid-chromatography-mass-spectrometry
#9
Liyan Hu, Lu Bo, Meiyan Zhang, Siqi Li, Xiujuan Zhao, Changhao Sun
1. This study evaluated the toxicity of chronic exposure to low-level cadmium (Cd) in rats using ultra-performance liquid chromatography-mass spectrometry (UPLC-MS). Forty male Sprague-Dawley rats were randomly assigned to four groups, namely, the control group, low-dose group (0.13 mg/kg·bw), middle-dose group (0.8 mg/kg·bw) and high-dose group (4.89 mg/kg·bw). The rats continuously received CdCl2 via drinking water for 24 weeks. Serum samples were collected for metabonomics analysis. The data generated from the UPLC-MS was analysed using principal components analysis (PCA) and partial least-squares discriminant analysis (PLS-DA)...
November 16, 2017: Xenobiotica; the Fate of Foreign Compounds in Biological Systems
https://www.readbyqxmd.com/read/29142804/analytical-study-of-effective-biodegradation-of-p-cresol-using-serratia-marcescens-abhi001-application-in-bioremediation
#10
Tripti Singh, Neha Srivastava, A K Bhatiya, P K Mishra
This study evaluated the capability of Serratia marcescens ABHI001 to effectively degrade p-cresol through different techniques. The molecular identity of the laboratory isolate S. marcescens ABHI001 was confirmed through the 16S ribosomal DNA gene pattern, and its morphological features were investigated through field-emission scanning electron microscopy. In addition, the degradation behavior of the isolate for cresol was verified using several techniques, including UV-visible spectroscopy, followed by high-performance liquid chromatography (HPLC), gas chromatography, and Fourier transform infrared spectroscopy...
December 2017: 3 Biotech
https://www.readbyqxmd.com/read/29142439/screening-of-norharmane-from-seven-cyanobacteria-by-high-performance-liquid-chromatography
#11
Tunay Karan, Ramazan Erenler
Background: Cyanobacteria, including pharmaceutically and medicinally valuable compounds attract the great attention lately. Norharmane (9H-pyrido (3,4-b) indole found in some cyanobacteria revealed a great number of biological effects. Objective: Seven cyanobacteria were isolated and identified from Yesilirmak River and Gaziosmanpasa University Campus to determine the norharmane content. Materials and Methods: Cyanobacteria collected from Tokat, Turkey were isolated and identified by morphologically...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142435/characterization-of-the-phenolic-compound-gallic-acid-from-sansevieria-roxburghiana-schult-and-schult-f-rhizomes-and-antioxidant-and-cytotoxic-activities-evaluation
#12
Rajalekshmi Maheshwari, Chandrashekara Shastry Shreedhara, Picheswara Rao Polu, Renuka Suresh Managuli, Seena Kanniparambil Xavier, Richard Lobo, Manjunath Setty, Srinivas Mutalik
Background: Sansevieria roxburghiana Schult. and Schult. f. (Asparagaceae) grows in India, Indonesia, Sri Lanka, and tropical Africa. Even though the plant has been traditionally used for the treatment of many ailments, the antioxidant and antiproliferative activities of S. roxburghiana methanol extract and its fractions have not yet been explored. Materials and Methods: Quantitative estimation of phenols and different antioxidant assays were performed using standard methods...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142430/topical-delivery-of-withania-somnifera-crude-extracts-in-niosomes-and-solid-lipid-nanoparticles
#13
Tawona N Chinembiri, Minja Gerber, Lissinda H du Plessis, Jan L du Preez, Josias H Hamman, Jeanetta du Plessis
Background: Withania somnifera is a medicinal plant native to India and is known to have anticancer properties. It has been investigated for its anti-melanoma properties, and since melanoma presents on the skin, it is prudent to probe the use of W. somnifera in topical formulations. To enhance topical drug delivery and to allow for controlled release, the use of niosomes and solid lipid nanoparticles (SLNs) as delivery vesicles were explored. Objective: The objective of this study is to determine the stability and topical delivery of W...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142426/in-silico-and-in-vitro-anticancer-activity-of-isolated-novel-marker-compound-from-chemically-modified-bioactive-fraction-from-curcuma-longa-nccl
#14
Arshi Naqvi, Richa Malasoni, Swati Gupta, Akansha Srivastava, Rishi R Pandey, Anil Kumar Dwivedi
Background: Turmeric (Curcuma longa) is reported to possess wide array of biological activities. Herbal Medicament (HM) is a standardized hexane-soluble fraction of C. longa and is well known for its neuroprotective effect. Objective: In this study, we attempted to synthesize a novel chemically modified bioactive fraction from HM (NCCL) along with isolation and characterization of a novel marker compound (I). Materials and Methods: NCCL was prepared from HM...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142422/chemotaxonomic-diversity-of-three-ficus-species-their-discrimination-using-chemometric-analysis-and-their-role-in-combating-oxidative-stress
#15
Nawal Al-Musayeib, Sherif S Ebada, Haidy A Gad, Fadia S Youssef, Mohamed Lotfy Ashour
Background: Genus Ficus (Moraceae) constitutes more than 850 species and about 2000 varieties and it acts as a golden mine that could afford effective and safe remedies combating many health disorders. Objectives: Discrimination of Ficus cordata, Ficus ingens, and Ficus palmata using chemometric analysis and assessment of their role in combating oxidative stress. Materials and Methods: Phytochemical profiling of the methanol extracts of the three Ficus species and their successive fractions was performed using high-performance liquid chromatography/electrospray ionization mass spectrometry...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142418/marantodes-pumilum-blume-kuntze-inhibited-secretion-of-lipopolysaccharide-and-monosodium-urate-crystal-stimulated-cytokines-and-plasma-prostaglandin-e2
#16
Eldiza Puji Rahmi, Jamia Azdina Jamal, Endang Kumolosasi, Juriyati Jalil, Nor-Ashila Aladdin
Background: Marantodes pumilum is traditionally used for dysentery, gonorrhea, and sickness in the bones. Previous studies revealed its antibacterial and xanthine oxidase inhibitory activities. Objective: To evaluate the inhibitory effects of three M. pumilum varieties on the secretion of lipopolysaccharide (LPS)- and monosodium urate crystal (MSU)-induced cytokines and plasma prostaglandin E2 (PGE2) in vitro. Materials and Methods: The leaves and roots of M...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142404/chalepin-a-compound-from-ruta-angustifolia-l-pers-exhibits-cell-cycle-arrest-at-s-phase-suppresses-nuclear-factor-kappa-b-nf-%C3%AE%C2%BAb-pathway-signal-transducer-and-activation-of-transcription-3-stat3-phosphorylation-and-extrinsic-apoptotic-pathway-in-non-small-cell
#17
Jaime Stella Moses Richardson, Norhaniza Aminudin, Sri Nurestri Abd Malek
Background: Plants have been a major source of inspiration in developing novel drug compounds in the treatment of various diseases that afflict human beings worldwide. Ruta angustifolia L. Pers known locally as Garuda has been conventionally used for various medicinal purposes such as in the treatment of cancer. Objective: A dihydrofuranocoumarin named chalepin, which was isolated from the chloroform extract of the plant, was tested on its ability to inhibit molecular pathways of human lung carcinoma (A549) cells...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142394/antioxidant-phytochemicals-of-opuntia-ficus-indica-l-mill-cladodes-with-potential-anti-spasmodic-activity
#18
Francesco Lanuzza, Francesco Occhiuto, Maria Teresa Monforte, Maria Marcella Tripodo, Valeria D'Angelo, Enza Maria Galati
Background: Opuntia ficus-indica (OFI) (L.) Mill. (Cactaceae), a plant widespread in dry regions of the world, shows interesting biological activities (cicatrizant, antiulcer, anti-inflammatory, and hypolipidemic) and is widely used in traditional medicine. Objectives: Phytochemical analysis and antispasmodic effect of wild OFI cladodes were carried out. Material and Methods: Polyphenols and Vitamin E occurrence, in antioxidant pool of OFI cladodes, were quantified by high-performance liquid chromatography...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142392/quantitative-analysis-of-benzyl-isothiocyanate-in-salvadora-persica-extract-and-dental-care-herbal-formulations-using-reversed-phase-c18-high-performance-liquid-chromatography-method
#19
Maged Saad Abdel-Kader, Y T Kamal, Prawez Alam, Mohammed Hamed Alqarni, Ahmed Ibrahim Foudah
Context: Benzyl isothiocyanate is the active antimicrobial agent in Salvadora persica (siwak) widely used in Islamic countries for oral hygiene. Aims: Quantification of benzyl isothiocyanate in the ethanol extract of S. persica and some dental care herbal formulations labeled to contain siwak. Settings and Design: Simple and sensitive high-performance liquid chromatography method was designed. Subjects and Methods: Separation was achieved on reverse phase C18 (250 mm × 4...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142388/analysis-of-free-amino-acids-in-different-extracts-of-orthosiphon-stamineus-leaves-by-high-performance-liquid-chromatography-combined-with-solid-phase-extraction
#20
Armaghan Shafaei, Nor Hidayah Ab Halim, Norhidayah Zakaria, Zhari Ismail
Background: Orthosiphon stamineus (OS) Benth is a medicinal plant and native in Southeast Asia. Previous studies have shown that OS leaves possess antioxidant, cytotoxic, diuretic, antihypertensive, and uricosuric effects. These beneficial effects have been attributed to the presence of primary and secondary metabolites such as polyphenols, amino acids, and flavonoids. Objective: To develop and validate an high-performance liquid chromatography (HPLC)-diode array detector (DAD) method combined with solid-phase extraction that involves precolumn derivatization with O-phthaladehyde for simultaneous analysis of free amino acids in OS leaves extracts...
October 2017: Pharmacognosy Magazine
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