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https://www.readbyqxmd.com/read/28429938/high-resolution-accurate-mass-mass-spectrometry-enables-in-depth-characterization-of-in-vivo-biotransformations-for-intact-antibody-drug-conjugates
#1
Jintang He, Dian Su, Carl K Ng, Luna Liu, Shang-Fan Yu, Thomas H Pillow, Geoffrey Del Rosario, Martine Darwish, Byoung-Chul Lee, Rachana Ohri, Hongxiang Zhou, Xueji Wang, Jiawei Lu, Surinder Kaur, Keyang Xu
Antibody-drug conjugates (ADCs) represent a promising class of therapeutics for the targeted delivery of highly potent cytotoxic drugs to tumor cells to improve bioactivity while minimizing side effects. ADCs are composed of both small and large molecules, and therefore have complex molecular structures. In vivo biotransformations may further increase the complexity of ADCs, representing a unique challenge for bioanalytical assays. Quadrupole time-of-flight mass spectrometry (Q-TOF MS) with electrospray ionization has been widely used for characterization of intact ADCs...
April 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28415842/spectrophotometric-quantification-of-peroxidase-with-p-phenylene-diamine-for-analyzing-peroxidase-encapsulating-lipid-vesicles
#2
Ya Zhang, Yannick R F Schmid, Sandra Luginbühl, Qiang Wang, Petra S Dittrich, Peter Walde
A spectrophotometric assay for the determination of horseradish peroxidase (HRP) in aqueous solution with p-phenylenediamine (PPD, benzene-1,4-diamine) as electron donor substrate and hydrogen peroxide (H2O2) as oxidant was developed. The oxidation of PPD by HRP/H2O2 leads to the formation of Bandrowski's base ((3E,6E)-3,6-bis[(4-aminophenyl)imino]cyclohexa-1,4-diene-1,4-diamine), which can be quantified by following the increase in absorbance at 500 nm. The assay was applied for monitoring the activity of HRP inside ≈180 nm-sized lipid vesicles (liposomes), prepared from POPC (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine) and purified by size exclusion chromatography...
April 17, 2017: Analytical Chemistry
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
#3
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/28395270/co-zn-and-ag-mofs-evaluation-as-biocidal-materials-towards-photosynthetic-organisms
#4
Keila Martín-Betancor, Sonia Aguado, Ismael Rodea-Palomares, Miguel Tamayo-Belda, Francisco Leganés, Roberto Rosal, Francisca Fernández-Piñas
In the present study, the biocidal activity of three different metal organic frameworks (MOFs) based on Co (Co-SIM1), Zn (Zn-SIM1) and Ag (Ag-TAZ) has been evaluated towards one green alga and two cyanobacteria. These organisms are present in fresh- and seawater and take part in the early stages of the biofouling process. The biocidal activity of these materials was evaluated by measuring chlorophyll a concentration and by inhibition zone testing. After 24h of exposure the three different MOFs caused >50% of chlorophyll a concentration inhibition towards both cyanobacteria, however, although the green alga presented a great sensitivity for Ag-TAZ (reaching 90% of chlorophyll a concentration inhibition), it was much more resistant to the rest of MOFs...
April 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28389914/ms-ms-analysis-and-imaging-of-lipids-across-drosophila-brain-using-secondary-ion-mass-spectrometry
#5
Nhu T N Phan, Marwa Munem, Andrew G Ewing, John S Fletcher
Lipids are abundant biomolecules performing central roles to maintain proper functioning of cells and biological bodies. Due to their highly complex composition, it is critical to obtain information of lipid structures in order to identify particular lipids which are relevant for a biological process or metabolic pathway under study. Among currently available molecular identification techniques, MS/MS in secondary ion mass spectrometry (SIMS) imaging has been of high interest in the bioanalytical community as it allows visualization of intact molecules in biological samples as well as elucidation of their chemical structures...
April 7, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28384408/polymer-dots-for-photoelectrochemical-bioanalysis
#6
Yu Li, Nan Zhang, Wei-Wei Zhao, De-Chen Jiang, Jing-Juan Xu, Hong-Yuan Chen
Different from the most extensively used inorganic quantum dots (Qdots) for the current state-of-the-art photoelectrochemical (PEC) bioanalysis, this work reports the first demonstration of polymer dots (Pdots) for novel PEC bioanalysis. The semiconducting Pdots were prepared via the reprecipitation method and then immobilized onto the transparent indium tin oxide glass electrode for PEC biodetection of the model molecule l-cysteine. The experimental results revealed that the as-fabricated Pdots exhibited excellent and interesting PEC activity and good analytical performance of rapid response, high stability, wide linear range, and excellent selectivity...
April 11, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28379687/kinetic-requirements-for-spatiotemporal-chemical-imaging-with-fluorescent-nanosensors
#7
Daniel Meyer, Annika Hagemann, Sebastian Kruss
Fluorescent nanosensors are powerful tools for basic research and bioanalytical applications. Individual nanosensors are able to detect single molecules, while ensembles of nanosensors can be used to measure the bulk concentration of an analyte. Collective imaging of multiple nanosensors could provide both spatial and temporal chemical information from the nano- to the microscale. This type of chemical imaging with nanosensors would be very attractive to study processes such as chemical signaling between cells (e...
April 10, 2017: ACS Nano
https://www.readbyqxmd.com/read/28375702/beyond-antibodies-as-binding-partners-the-role-of-antibody-mimetics-in-bioanalysis
#8
Xiaowen Yu, Yu-Ping Yang, Emre Dikici, Sapna K Deo, Sylvia Daunert
The emergence of novel binding proteins or antibody mimetics capable of binding to ligand analytes in a manner analogous to that of the antigen-antibody interaction has spurred increased interest in the biotechnology and bioanalytical communities. The goal is to produce antibody mimetics designed to outperform antibodies with regard to binding affinities, cellular and tumor penetration, large-scale production, and temperature and pH stability. The generation of antibody mimetics with tailored characteristics involves the identification of a naturally occurring protein scaffold as a template that binds to a desired ligand...
March 24, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28374318/erratum-to-systematic-verification-of-bioanalytical-similarity-between-a-biosimilar-and-a-reference-biotherapeutic-committee-recommendations-for-the-development-and-validation-of-a-single-ligand-binding-assay-to-support-pharmacokinetic-assessments
#9
Joseph C Marini, Michael Anderson, Xiao-Yan Cai, John Chappell, Todd Coffey, Dominique Gouty, Aparna Kasinath, Vera Koppenburg, Philip Oldfield, Shannon Rebarchak, Ronald R Bowsher
No abstract text is available yet for this article.
April 3, 2017: AAPS Journal
https://www.readbyqxmd.com/read/28370076/analytical-challenges-in-quantifying-abiraterone-with-lc-ms-ms-in-human-plasma
#10
Guillemette E Benoist, Eric van der Meulen, Floor J E Lubberman, Winald R Gerritsen, Tineke J Smilde, Jack A Schalken, Jan H Beumer, David M Burger, Nielka P van Erp
A method was developed and validated to quantify abiraterone in human plasma. During assay development several analytical challenges were encountered: limited stability in patient samples, adsorption to glass, co-elution with metabolites, and carry-over issues. Limited stability (2 h) was found for abiraterone in fresh plasma as well as whole blood at ambient temperature. When kept at 2-8 °C, abiraterone in plasma was stable for 24 h and in whole blood for 8 h. Adsorption of abiraterone to glass materials was addressed by using polypropylene throughout the method...
April 3, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28362396/fabrication-of-three-dimensional-paper-based-microfluidic-devices-for-immunoassays
#11
Syrena C Fernandes, Daniel J Wilson, Charles R Mace
Paper wicks fluids autonomously due to capillary action. By patterning paper with hydrophobic barriers, the transport of fluids can be controlled and directed within a layer of paper. Moreover, stacking multiple layers of patterned paper creates sophisticated three-dimensional microfluidic networks that can support the development of analytical and bioanalytical assays. Paper-based microfluidic devices are inexpensive, portable, easy to use, and require no external equipment to operate. As a result, they hold great promise as a platform for point-of-care diagnostics...
March 9, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28362102/systems-toxicology-real-world-applications-and-opportunities
#12
Thomas Hartung, Rex E FitzGerald, Paul Jennings, Gary R Mirams, Manuel C Peitsch, Amin Rostami-Hodjegan, Imran Shah, Martin F Wilks, Shana J Sturla
Systems Toxicology aims to change the basis of how adverse biological effects of xenobiotics are characterized from empirical end points to describing modes of action as adverse outcome pathways and perturbed networks. Toward this aim, Systems Toxicology entails the integration of in vitro and in vivo toxicity data with computational modeling. This evolving approach depends critically on data reliability and relevance, which in turn depends on the quality of experimental models and bioanalysis techniques used to generate toxicological data...
April 17, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/28357863/functional-cryogel-microstructures-prepared-by-light-induced-cross-linking-of-a-photoreactive-copolymer
#13
Marc Zinggeler, Jan-Niklas Schönberg, Patrick L Fosso, Thomas Brandstetter, Jürgen Rühe
A novel, highly efficient method for the preparation of functional, microstructured and surface-attached cryogels is described. Photoinduced C,H-insertion reactions are used to generate cryogels in a single, rapid photo-cross-linking process. To this end, solutions containing both a photoreactive copolymer and the (bio)molecules to be immobilized are placed on a polymeric substrate followed by freezing and a short UV exposure. This strategy combines photolithography and cryogel formation allowing for a simultaneous generation and (bio)functionalization of cryogels in a single reaction step...
April 3, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28344828/lc-ms-ms-assay-for-quantitation-of-enalapril-and-enalaprilat-in-plasma-for-bioequivalence-study-in-indian-subjects
#14
Dhiman Halder, Shubhasis Dan, Murari Mohun Pal, Easha Biswas, Nilendra Chatterjee, Pradipta Sarkar, Umesh Chandra Halder, Tapan Kumar Pal
BACKGROUND: Enalapril (EPL) is an angiotensin-converting enzyme inhibitor for the treatment of hypertension and chronic heart failure. Enalaprilat (EPLT) is an active metabolite that contributes to the overall activity of EPL. AIM: To quantitate EPL along with its metabolite EPLT using LC-MS/MS, a bioanalytical method was developed and validated with tolbutamide in human plasma using a protein precipitation technique. RESULTS: The sensitive and selective method has an LLOQ of 1 ng/ml with a linearity range of 1-500 ng/ml for both EPL and EPLT using 300 µl of plasma without any matrix effect...
March 2017: Future Science OA
https://www.readbyqxmd.com/read/28344632/dynamic-and-temporal-assessment-of-human-dried-blood-spot-ms-ms-all-shotgun-lipidomics-analysis
#15
Fei Gao, Justice McDaniel, Emily Y Chen, Hannah E Rockwell, Jeremy Drolet, Vivek K Vishnudas, Vladimir Tolstikov, Rangaprasad Sarangarajan, Niven R Narain, Michael A Kiebish
BACKGROUND: Real-time and dynamic assessment of an individual's lipid homeostatic state in blood is complicated due to the need to collect samples in a clinical environment. In the context of precision medicine and population health, tools that facilitate sample collection and empower the individual to participate in the process are necessary to complement advanced bioanalytical analysis. The dried blood spot (DBS) methodology via finger prick or heel prick is a minimally invasive sample collection method that allows the relative ease and low cost of sample collection as well as transport...
2017: Nutrition & Metabolism
https://www.readbyqxmd.com/read/28344361/the-interaction-of-fluorescent-nanodiamond-probes-with-cellular-media
#16
Simon R Hemelaar, Andreas Nagl, François Bigot, Melissa M Rodríguez-García, Marcel P de Vries, Mayeul Chipaux, Romana Schirhagl
Fluorescent nanodiamonds (FNDs) are promising tools to image cells, bioanalytes and physical quantities such as temperature, pressure, and electric or magnetic fields with nanometer resolution. To exploit their potential for intracellular applications, the FNDs have to be brought into contact with cell culture media. The interactions between the medium and the diamonds crucially influence sensitivity as well as the ability to enter cells. The authors demonstrate that certain proteins and salts spontaneously adhere to the FNDs and may cause aggregation...
2017: Mikrochimica Acta
https://www.readbyqxmd.com/read/28343420/portable-devices-and-mobile-instruments-for-infectious-diseases-point-of-care-testing
#17
Luc Bissonnette, Michel G Bergeron
Rapidity, simplicity, and portability are highly desirable characteristics of tests and devices designed for performing diagnostics at the point of care (POC), either near patients managed in healthcare facilities or to offer bioanalytical alternatives in external settings. By reducing the turnaround time of the diagnostic cycle, POC diagnostics can reduce the dissemination, morbidity, and mortality of infectious diseases and provide tools to control the global threat of antimicrobial resistance. Areas covered: A literature search of PubMed and Google Scholar, and extensive mining of specialized publications, Internet resources, and manufacturers' websites have been used to organize and write this overview of the challenges and requirements associated with the development of portable sample-to-answer diagnostics, and showcase relevant examples of handheld devices, portable instruments, and less mobile systems which may or could be operated at POC...
April 11, 2017: Expert Review of Molecular Diagnostics
https://www.readbyqxmd.com/read/28343347/bioanalysis-of-farnesyl-pyrophosphate-in-human-plasma-by-high-performance-liquid-chromatography-coupled-to-triple-quadrupole-tandem-mass-spectrometry-and-hybrid-quadrupole-orbitrap-high-resolution-mass-spectrometry
#18
Hiroshi Sugimoto, Mie Iguchi, Fumihiro Jinno
The isoprenoids farnesyl pyrophosphate (FPP) and geranylgeranyl pyrophosphate (GGPP) are pivotal intermediates for cholesterol homeostasis and cell signaling in the mevalonate pathway. We developed a sensitive and selective high-performance liquid chromatography tandem triple quadrupole mass spectrometry (LC-QQQ-MS) method for FPP in human plasma without the need for a derivatization process. We optimized the sample preparation procedure to extract FPP and (13)C5-FPP (as internal standard) from sample fluids using methanol...
March 25, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28341989/a-fully-validated-bioanalytical-method-using-an-uhplc-ms-ms-system-for-quantification-of-dna-and-rna-oxidative-stress-biomarkers
#19
Barbora Cervinkova, Lenka Kujovska Krcmova, Veronika Sestakova, Dagmar Solichova, Petr Solich
A new, rapid and effective ultra-high-performance liquid chromatography method with mass spectrometry detection is described for the separation and quantification of 8-hydroxy-2-deoxyguanosine, 8-hydroxyguanosine and creatinine in human urine. The present study uses an isotope-labelled internal standard ([(15)N]5-8-hydroxy-2-deoxyguanosine), a BIO core-shell stationary phase and an isocratic elution of methanol and water. Sample preparation of human urine was performed by solid-phase extraction (SPE) on Oasis HLB cartridges with methanol/water 50:50 (v/v) elution...
March 24, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28341309/polymorphic-distribution-of-proteins-in-solution-by-mass-spectrometry-the-analysis-of-insulin-analogues
#20
Maely P Fávero-Retto, Luiz Henrique Guerreiro, Cássio M Pessanha, Leonardo C Palmieri, Luís Maurício T R Lima
The characterization of conformational and oligomeric distribution of proteins is of paramount importance for the understanding of the correlation between structure and function. Among the bioanalytical approaches currently available, the electrospray ionization-mass spectrometry (ESI-MS) coupled to ion mobility spectrometry (IMS) is the best suited for high resolution identification with high sensitivity, allowing the in situ separation of oligomeric and conformational species. We tested the performance of the ESI-MS technique along with the IMS separation approach on a broad variety of insulin and insulin analogues with distinct oligomeric distribution pattern...
January 2017: Biologicals: Journal of the International Association of Biological Standardization
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