Diese Arbeit wurde von der Health Canada Genomics Research and Development Initiative (GRDI) und der kanadischen Regulierungsstrategie für die Biotechnologie (CRSB) gefördert. Die Autoren haben keinen Interessenkonflikt.

<ol>
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L., Douki, T., Duez, P., Gremaud, E., Herbert, K., Hofer, T., Lasserre, L., Saint-Pierre, C., Favier, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cellular+background+level+of+8-oxo-7,8-dihydro-2'-deoxyguanosine:+an+isotope+based+method+to+evaluate+artefactual+oxidation+of+DNA+during+its+extraction+and+subsequent+work-up.">Cellular background level of 8-oxo-7,8-dihydro-2'-deoxyguanosine: an isotope based method to evaluate artefactual oxidation of DNA during its extraction and subsequent work-up.</a> Carcinogenesis. 23 (11), 1911-1918 (2002).</li><li>Gossen, J. A., De Leeuw, W. J. F., Tan, C. H. T., Zwarthoff, E. C., Berends, F., Lohman, P. H. M., Knook, D. 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No conflict of interest or competing financial interests declared.

Obwohl 8-oxo-dGuo wurde als nützlicher Biomarker von DNA-Oxidation berichtet, kann seine zuverlässige Quantifizierung eine Herausforderung darstellen. Obwohl mehrere veröffentlichte Verfahren existieren, gibt es einen Bedarf für eine umfassende, beschreibende Übersicht der Protokoll den Forschern ermöglichen, das Verfahren in ihren Laboratorien bereitstellen. Hier präsentieren wir Ihnen einen detaillierten Überblick über eine HPLC-basiertes Protokoll, das neue Benutzer erlauben, ein wirksames Verfahren für 8-o...

Reaktive Sauerstoffspezies (ROS), dessen stationäre Ebenen können während viele pathologische Zustände und xenotoxic Stoffwechsel zu erhöhen, tragen zu einer erhöhten Häufigkeit der oxidative DNA-Schäden. Unter mehreren möglichen Nukleobasen Oxidationsprodukte können oxidative DNA-Schädigung leicht unter Verwendung der stabilen Marker gemessen werden 8-oxo-7,8-dihydro-2&#39;-Desoxyguanosin (8-oxo-dGuo), die eine der oxidierten Formen 2 &#39; -deoxyguanosine (dGuo) 1. 8-oxo-dGuo ist das am häufigsten vorkommende DNA-Läsion 2, und deshalb wurde auf größerem Detail als DNA Oxidations Biomarker trotz der Existenz von mehreren DNA-Oxidationsprodukte 3 untersucht. Beim Menschen kann dieser Schaden über Basenexzisionsreparatur von 8-Oxoguanin Glycosylase 1 (hOGG1) 4 repariert werden. Wenn unbe unrepaired können 8-oxo-dGuo zur Bildung von Basenpaar-Substitutionsmutationen (dh G-Trans V) beitragen 4. Wichtig ist, dass 8-oxo-dGuo ein etablierter Marker for DNA-Schaden in Bezug auf die Initiierung und Förderung der Karzinogenese 2. Daher genaue Quantifizierung von 8-oxo-dGuo ist eine nützliche und wünschenswerte Biomarker für oxidativen DNA-Schädigung 5. Es gibt weit verbreitete Verwirrung in der Literatur über den richtigen Namen für oxidativ beschädigte Formen der 2-Desoxyguanosin und darüber hinaus der richtige Name der Verbindung (en) routinemäßig als Biomarker für oxidative DNA-Schäden 6 gemessen. Die 6,8-Diketo-und 6-Enol, 8-keto tautomeren Formen der 8-oxo-dGuo (in 1 gezeigt), sind die beiden wichtigsten Tautomere in der Literatur diskutiert 5,7. Der 6,8-Diketo-Form ist das Hauptproblem bei einem physiologischen pH-Wert von 7,4 und ist das bekannteste DNA Oxidationsprodukt 7. Deshalb 8-oxo-dGuo ist nicht 8-Hydroxy-dGuo die am besten geeignete Namen für diese Oxidationsprodukt 6. Es ist auch wichtig zu beachten, dass 2-Desoxyguanosin (dGuo) anstatt nucleobase Guanin (Gua) oder Ribonukleosid Guanosin (Guo) verbunden sind, wird von den meisten Verfahren 6 erfaßt. Genaue Detektion und Quantifizierung von 8-oxo-dGuo ist schwierig aufgrund: i) Schwankungen bei der Verdauung der DNA-Probe, ii) Eine zufällige Oxidation dGuo bis 8-oxo-dGuo, die während der Probenvorbereitung erfolgen kann, und iii) die Notwendigkeit für eine effektive Überprüfung der analytischen HPLC-ED Methode 8. In diesem Protokoll zur Erreichung i) durch das Bereitstellen von Bedingungen, günstig für vollständige DNA-Verdauung und ii) durch die Aufnahme Metallchelatbildner und Chelator-behandelten Lösungen und einer speziellen DNA-Isolierung Reagenz, während iii) nur teilweise durch die Aufnahme von adressierten gerichtet wir positive Kontrollen und somit vorausgesetzt, daß die Methode zum Aufspüren von 8-oxo-dGuo in biologischen Proben ist. Weitere Bestätigung über den Rahmen dieses Dokuments. Wir sind jedoch zuversichtlich, dass dieses Protokoll wird den Interessenten helfenBenutzer bestimmen, in welchem ​​Ausmaß die sie benötigen, um das Protokoll formal validieren, abhängig von ihren Zwecken. Eine Liste der Schritte für die formale Validierung des Verfahrens erforderlich ist ferner vorgesehen. Während der Entwicklung und Bereitstellung eines Verfahrens zur 8-oxo-dGuo Erkennung, veröffentlicht wurden Methoden überprüft und konsolidiert. Somit beseitigt dieses Verfahren die Notwendigkeit, Informationen aus verschiedenen veröffentlichten Quellen, die oft fehlen wichtige experimentelle Details während sie auch eine schnelle und einfache Methode zur Messung, wenn das Verfahren zum Nachweis und zur Quantifizierung von 8-oxo-dGuo wurde erfolgreich angenommen sammeln. Diese angepasste Verfahren wurde eingesetzt, um DNA-Proben erfolgreich analysieren aus kultivierten Zellen und murinen Gewebe. Dieses Video Artikel werden andere Gruppen die Schaffung eines wirksamen Verfahrens zur sicheren Erkennung und Quantifizierung von 8-oxo-dGuo durch HPLC-ED unterstützen.

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>8-oxo-dGuo standard</td>
			<td>Cayman Chemical Company</td>
			<td>89320</td>
			<td>Inappropriately referred to as &#34;8-hydroxy-2&#39;-deoxy Guanosine&#34; - see Fig. 1 and text for details</td>
		</tr>
		<tr>
			<td>Alkaline phosphatase&#160;</td>
			<td>Sigma-Aldrich</td>
			<td>P5931</td>
			<td>From E.coli</td>
		</tr>
		<tr>
			<td>Chelex 100</td>
			<td>Sigma-Aldrich</td>
			<td>C7901</td>
			<td>Chelates heavy metals</td>
		</tr>
		<tr>
			<td>Desferoxamine mesylate</td>
			<td>Sigma-Aldrich</td>
			<td>D9533</td>
			<td></td>
		</tr>
		<tr>
			<td>dGuo standard</td>
			<td>Sigma-Aldrich</td>
			<td>D7145</td>
			<td></td>
		</tr>
		<tr>
			<td>Dibasic sodium phosphate</td>
			<td>Sigma-Aldrich</td>
			<td>S9390</td>
			<td></td>
		</tr>
		<tr>
			<td>DNA from salmon sperm</td>
			<td>Sigma-Aldrich</td>
			<td>D1626</td>
			<td>Sodium salt</td>
		</tr>
		<tr>
			<td>DNase I</td>
			<td>Sigma-Aldrich</td>
			<td>D4527</td>
			<td>TypeII, from bovine pancreas</td>
		</tr>
		<tr>
			<td>DNAzol</td>
			<td>Invitrogen</td>
			<td>10503-27</td>
			<td></td>
		</tr>
		<tr>
			<td>Ethylenediaminetetraacetic acid disodium salt dihydrate (EDTA)</td>
			<td>Sigma-Aldrich</td>
			<td>E4884</td>
			<td>The compound would not completely dissolve until solution pH is adjusted to 8.0 with e.g. NaOH</td>
		</tr>
		<tr>
			<td>F12-K media</td>
			<td>ATCC</td>
			<td>30-2004</td>
			<td></td>
		</tr>
		<tr>
			<td>Foetal bovine serum</td>
			<td>ATCC</td>
			<td>30-2020</td>
			<td></td>
		</tr>
		<tr>
			<td>Guard column</td>
			<td>Chromatographic Specialties</td>
			<td>YBA 99S03 0204GC</td>
			<td>Protects colum from contamination; may also lead to pressure build-up</td>
		</tr>
		<tr>
			<td>Magnesium chloride</td>
			<td>Sigma-Aldrich</td>
			<td>M8266</td>
			<td></td>
		</tr>
		<tr>
			<td>Monobasic sodium phosphate</td>
			<td>Sigma-Aldrich</td>
			<td>S9638</td>
			<td></td>
		</tr>
		<tr>
			<td>Penicillin-Streptomycin</td>
			<td>Invitrogen</td>
			<td>15140-122</td>
			<td></td>
		</tr>
		<tr>
			<td>Phosphate buffered saline</td>
			<td>Invitrogen</td>
			<td>15190-250</td>
			<td></td>
		</tr>
		<tr>
			<td>Phosphodiesterase I enzyme&#160;</td>
			<td>Sigma-Aldrich</td>
			<td>P3243</td>
			<td>Type II from Crotalus adamaneus venom</td>
		</tr>
		<tr>
			<td>Teflon homogenizer</td>
			<td>Thomas Scientific</td>
			<td>7724T-1 or 7724T-5 for 1 or 5 mL, respectively</td>
			<td>Volume (holding capacity) depends on the amount of sample to be processed.</td>
		</tr>
		<tr>
			<td>Trypsin</td>
			<td>Invitrogen</td>
			<td>15050-065</td>
			<td></td>
		</tr>
		<tr>
			<td>YMC-BASIC column with bonded spherical silica</td>
			<td>Chromatographic Specialties</td>
			<td>YBA 99S03 1546WT</td>
			<td></td>
		</tr>
	</tbody>
</table>

hplc measurement of the dna oxidation biomarker, 8-oxo-7,8-dihydro-2&#8217;-deoxyguanosine, in cultured cells and animal tissues

Oxidativer Stress ist mit vielen physiologischen und pathologischen Prozessen, wie auch Fremdstoffmetabolismus assoziiert, was zur Oxidation von Biomakromolekülen, einschließlich DNA. Daher ist eine effiziente Detektion von DNA-Oxidation wichtig für eine Vielzahl von Forschungsbereichen, einschließlich der Medizin und Toxikologie. Eine gemeinsame Biomarker oxidativ geschädigten DNA 8-oxo-7,8-dihydro-2&#39;-Desoxyguanosin (8-oxo-dGuo; oft fälschlicherweise bezeichnet als 8-Hydroxy-2&#39;-Deoxyguanosin (8-OH-dGuo oder 8 oxo-dG)). Mehrere Protokolle für 8-oxo-dGuo Messung durch Hochdruckflüssigkeitschromatographie mit elektrochemischer Detektion (HPLC-ED) sind beschrieben worden. Diese wurden jedoch in erster Linie um gereinigte DNA mit Prooxidantien behandelt angewendet. Darüber hinaus aufgrund methodischer Unterschiede zwischen Labors, vor allem aufgrund der Unterschiede in Analysegeräten, die Annahme von veröffentlichten Verfahren zum Nachweis von 8-oxo-dGuo durch HPLC-ED erfordert eine sorgfältige Optimierung von jedem Labor. EINumfassendes Protokoll, wie einen Optimierungsprozess beschreiben, fehlt. Hier wird ein detailliertes Protokoll für die Erfassung von 8-oxo-dGuo durch HPLC-ED aus kultivierten Zellen oder tierische Gewebe beschrieben, in DNA. Sie veranschaulicht, wie die DNA-Aufreinigung kann leicht und schnell optimiert, um unerwünschte DNA-Oxidation, die während der Probenvorbereitung erfolgen kann minimiert werden. Dieses Protokoll zeigt, wie zu erkennen 8-oxo-dGuo in kultivierten menschlichen alveolaren Adenokarzinomzellen (dh, A549-Zellen) mit dem Oxidationsmittel KBrO 3 behandelt und aus der Milz von Mäusen, die polycyclische aromatische Kohlenwasserstoff Dibenzo (DEF, p) ausgesetzt Chrysen (DBC, früher bekannt als Dibenzo (a, l) pyren bekannt, DALP). Insgesamt zeigt diese Arbeit, wie ein HPLC-ED-Methodik kann leicht für die Erfassung von 8-oxo-dGuo in biologischen Proben zu optimieren.

dGuo wurde beobachtet, dass eine Retentionszeit von 4,7 min wohin 8-oxo-dGuo hatte eine Retentionszeit von etwa 6,4 min (2A und B). Es gibt etwa 1000-facher Unterschied in den Peakhöhen der beiden Analyten, wie in 2C zu sehen. Voltammogramme für 8-oxo-dGuo und dGuo wurden durch Ausführen von Standards bei einer Arbeitsspannung im Bereich von 0,2 bis 1,1 V. erhaltene optimale Arbeitspotential für 8-oxo-dGuo bestimmt wurde auf +0,5 V und +0,9 betragen V für dGuo <str...

Watch this Scientific Journal Video about HPLC Measurement of the DNA Oxidation Biomarker, 8-oxo-7,8-dihydro-2â€™-deoxyguanosine, in Cultured Cells and Animal Tissues at JoVE.com

HPLC Measurement of the DNA Oxidation Biomarker, 8-oxo-7,8-dihydro-2&#8217;-deoxyguanosine, in Cultured Cells and Animal Tissues

Das Ziel des Protokolls ist die Detektion der DNA-Oxidation Marker, 8-oxo-7,8-dihydro-2&#39;-Desoxyguanosin (8-oxo-dGuo) durch HPLC-ED, in DNA aus kultivierten Zellen oder tierische Gewebe.

HPLC-Messung der DNA-Oxidation Biomarker, 8-oxo-7,8-dihydro-2&#39;-Desoxyguanosin, in kultivierten Zellen und tierischen Geweben

Oxidative stress is associated with many physiological and pathological processes, as well as xenobiotic metabolism, leading to the oxidation of ...

hplc-measurement-dna-oxidation-biomarker-8-oxo-78-dihydro-2

Research

JoVE Journal

Chemistry

26.2K Aufrufe.  Health Canada.  Das Ziel des Protokolls ist die Detektion der DNA-Oxidation Marker, 8-oxo-7,8-dihydro-2'-Desoxyguanosin (8-oxo-dGuo) durch HPLC-ED, in DNA aus kultivierten Zellen oder tierische Gewebe. 

Serie: HPLC Measurement of the DNA Oxidation Biomarker, 8-oxo-7,8-dihydro-2’-deoxyguanosine, in Cultured Cells and Animal Tissues

Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity

Human 8-oxoguanine DNA glycosylase (OGG1) excises the mutagenic oxidative DNA lesion 8-oxo-7,8-dihydroguanine (8-oxoG) from DNA. Kinetic characterization of OGG1 is undertaken to measure the rates of 8-oxoG excision and product release. When the OGG1 concentration is lower than substrate DNA, time courses of product formation are biphasic; a rapid exponential phase (i.e. burst) of product formation is followed by a linear steady-state phase. The initial burst of product formation corresponds to the concentration of enzyme properly engaged on the substrate, and the burst amplitude depends on the concentration of enzyme. The first-order rate constant of the burst corresponds to the intrinsic rate of 8-oxoG excision and the slower steady-state rate measures the rate of product release (product DNA dissociation rate constant, koff). Here, we describe steady-state, pre-steady-state, and single-turnover approaches to isolate and measure specific steps during OGG1 catalytic cycling. A fluorescent labeled lesion-containing oligonucleotide and purified OGG1 are used to facilitate precise kinetic measurements. Since low enzyme concentrations are used to make steady-state measurements, manual mixing of reagents and quenching of the reaction can be performed to ascertain the steady-state rate (koff). Additionally, extrapolation of the steady-state rate to a point on the ordinate at zero time indicates that a burst of product formation occurred during the first turnover (i.e. y-intercept is positive). The first-order rate constant of the exponential burst phase can be measured using a rapid mixing and quenching technique that examines the amount of product formed at short time intervals (&lt;1 sec) before the steady-state phase and corresponds to the rate of 8-oxoG excision (i.e. chemistry). The chemical step can also be measured using a single-turnover approach where catalytic cycling is prevented by saturating substrate DNA with enzyme (E&gt;S). These approaches can measure elementary rate constants that influence the efficiency of removal of a DNA lesion.

Time courses for the glycosylase activity of 8-oxoguanine DNA glycosylase are biphasic exhibiting a burst of product formation and a linear steady-state phase. Utilizing quench-flow techniques, the burst and the steady-state rates can be measured, which correspond to excision of 8-oxoguanine and release of the glycosylase from the product DNA, respectively.

Steady-State-, Pre-Steady-State-und Einzel-Umsatz Kinetic Measurement für DNA Glycosylase Aktivität

Human 8-oxoguanine DNA glycosylase (OGG1) excises the mutagenic oxidative DNA lesion 8-oxo-7,8-dihydroguanine (8-oxoG) from DNA. Kinetic characterization ...

Forschung

Chemie

Folding and Characterization of a Bio-responsive Robot from DNA Origami

The DNA nanorobot is a hollow hexagonal nanometric device, designed to open in response to specific stimuli and present cargo sequestered inside. Both stimuli and cargo can be tailored according to specific needs. Here we describe the DNA nanorobot fabrication protocol, with the use of the DNA origami technique. The procedure initiates by mixing short single-strand DNA staples into a stock mixture which is then added to a long, circular, single-strand DNA scaffold in presence of a folding buffer. A standard thermo cycler is programmed to gradually lower the mixing reaction temperature to facilitate the staples-to-scaffold annealing, which is the guiding force behind the folding of the nanorobot. Once the 60 hr folding reaction is complete, excess staples are discarded using a centrifugal filter, followed by visualization via agarose-gel electrophoresis (AGE). Finally, successful fabrication of the nanorobot is verified by transmission electron microscopy (TEM), with the use of uranyl-formate as negative stain.

DNA origami is a powerful method for fabricating precise nanoscale objects by programming the self-assembly of DNA molecules. Here we describe a protocol for the folding of a bio-responsive robot from DNA origami, its purification and negative staining for transmission electron microscopic imaging (TEM).

Falten und Charakterisierung eines Bio-responsive Robot von DNA-Origami

The DNA nanorobot is a hollow hexagonal nanometric device, designed to open in response to specific stimuli and present cargo sequestered inside. Both ...

Construction of Models for Nondestructive Prediction of Ingredient Contents in Blueberries by Near-infrared Spectroscopy Based on HPLC Measurements

Nondestructive prediction of ingredient contents of farm products is useful to ship and sell the products with guaranteed qualities. Here, near-infrared spectroscopy is used to predict nondestructively total sugar, total organic acid, and total anthocyanin content in each blueberry. The technique is expected to enable the selection of only delicious blueberries from all harvested ones. The near-infrared absorption spectra of blueberries are measured with the diffuse reflectance mode at the positions not on the calyx. The ingredient contents of a blueberry determined by high-performance liquid chromatography are used to construct models to predict the ingredient contents from observed spectra. Partial least squares regression is used for the construction of the models. It is necessary to properly select the pretreatments for the observed spectra and the wavelength regions of the spectra used for analyses. Validations are necessary for the constructed models to confirm that the ingredient contents are predicted with practical accuracies. Here we present a protocol to construct and validate the models for nondestructive prediction of ingredient contents in blueberries by near-infrared spectroscopy.

We present here a protocol to construct and validate models for nondestructive prediction of total sugar, total organic acid, and total anthocyanin content in individual blueberries by near-infrared spectroscopy.

Der Bau der Modelle für die zerstörungsfreie Vorhersage von Ingredient Inhalt in Heidelbeeren durch Nahinfrarotspektroskopie Basierend auf HPLC-Messungen

Nondestructive prediction of ingredient contents of farm products is useful to ship and sell the products with guaranteed qualities. Here, near-infrared ...

HPLC-based Assay to Monitor Extracellular Nucleotide/Nucleoside Metabolism in Human Chronic Lymphocytic Leukemia Cells

This method describes a sensitive, specific, reliable and reproducible reverse phase high-performance liquid chromatography (RP-HPLC) assay developed and validated for the quantification of extracellular purine nucleotides and nucleosides produced by purified chronic lymphocytic leukemia (CLL) cells under different culture conditions. The chromatographic separation of adenosine 5&#39;-monophosphate (AMP), adenosine (ADO) and inosine (INO) is performed at RT on a silica-based, reversed-phase column that is used for polar compound retention. The method includes a binary mobile phase, which consists of 7 mM ammonium acetate and acetonitrile with a flow rate of 1.00 ml/min. The eluates are monitored using a Photodiode Array UV detector set at 260 nm. A standard calibration curve is generated to calculate the equation for the analytical quantification of each purine compound. System control, data acquisition and analysis are then performed. Applying this protocol, AMP, INO and ADO elute at 7, 11 and 11.9 min, respectively, and the total run time for each sample is 20 min. This protocol may be applied to different cell types and cell lines (both suspension and adherent), using culture media as matrix. The advantages are easy and fast sample preparation and the requirement of a small amount of supernatant for analysis. Furthermore, the use of a serum-free medium allows skipping the protein precipitation step with acetonitrile that impacts the final concentration of purine compounds. One of the limitations of the method is the requirement of the equilibration column run before each single sample run, making the total run time of the experiment longer and preventing high throughput screening applications.

The protocol described here represents an easy and reproducible method that employs reverse phase high-performance liquid chromatography (RP-HPLC) to measure purine metabolism on chronic lymphocytic leukemia (CLL) cells cultured under different conditions.

HPLC-basierten Assay extrazelluläre Nucleotid / Nukleosid Metabolismus in menschlichen chronischer lymphatischer Leukämie-Zellen zu überwachen

This method describes a sensitive, specific, reliable and reproducible reverse phase high-performance liquid chromatography (RP-HPLC) assay developed and ...

Synthesis of Protein Bioconjugates via Cysteine-maleimide Chemistry

The chemical linking or bioconjugation of proteins to fluorescent dyes, drugs, polymers and other proteins has a broad range of applications, such as the development of antibody drug conjugates (ADCs) and nanomedicine, fluorescent microscopy and systems chemistry. For many of these applications, specificity of the bioconjugation method used is of prime concern. The Michael addition of maleimides with cysteine(s) on the target proteins is highly selective and proceeds rapidly under mild conditions, making it one of the most popular methods for protein bioconjugation.
We demonstrate here the modification of the only surface-accessible cysteine residue on yeast cytochrome c with a ruthenium(II) bisterpyridine maleimide. The protein bioconjugation is verified by gel electrophoresis and purified by aqueous-based fast protein liquid chromatography in 27% yield of isolated protein material. Structural characterization with MALDI-TOF MS and UV-Vis is then used to verify that the bioconjugation is successful. The protocol shown here is easily applicable to other cysteine - maleimide coupling of proteins to other proteins, dyes, drugs or polymers.

Synthesis of Protein Bioconjugates via Cysteine-maleimide Chemistry

This protocol details the important steps required for the bioconjugation of a cysteine containing protein to a maleimide, including reagent purification, reaction conditions, bioconjugate purification and bioconjugate characterization.

Synthese von Protein Biokonjugate<em&gt; über</em&gt; Cystein-maleimid Chemie

The chemical linking or bioconjugation of proteins to fluorescent dyes, drugs, polymers and other proteins has a broad range of applications, such as the ...

Determining the Chemical Composition of Corrosion Inhibitor/Metal Interfaces with XPS: Minimizing Post Immersion Oxidation

An approach for acquiring more reliable X-ray photoelectron spectroscopy data from corrosion inhibitor/metal interfaces is described. More specifically, the focus is on metallic substrates immersed in acidic solutions containing organic corrosion inhibitors, as these systems can be particularly sensitive to oxidation following removal from solution. To minimize the likelihood of such degradation, samples are removed from solution within a glove box purged with inert gas, either N2 or Ar. The glove box is directly attached to the load-lock of the ultra-high vacuum X-ray photoelectron spectroscopy instrument, avoiding any exposure to the ambient laboratory atmosphere, and thus reducing the possibility of post immersion substrate oxidation. On this basis, one can be more certain that the X-ray photoelectron spectroscopy features observed are likely to be representative of the in situ submerged scenario, e.g. the oxidation state of the metal is not modified.

A protocol to avoid the oxidation of metallic substrates during sample transfer from an inhibited acidic solution to an X-ray photoelectron spectrometer is presented.

Die Bestimmung der chemischen Zusammensetzung von Corrosion Inhibitor / Metal-Schnittstellen mit XPS: Minimierung Beitrag Tauch Oxidation

An approach for acquiring more reliable X-ray photoelectron spectroscopy data from corrosion inhibitor/metal interfaces is described. More specifically, ...

Fabrication and Testing of Photonic Thermometers

In recent years, a push for developing novel silicon photonic devices for telecommunications has generated a vast knowledge base that is now being leveraged for developing sophisticated photonic sensors. Silicon photonic sensors seek to exploit the strong confinement of light in nano-waveguides to transduce changes in physical state to changes in resonance frequency. In the case of thermometry, the thermo-optic coefficient, i.e., changes in refractive index due to temperature, causes the resonant frequency of the photonic device such as a Bragg grating to drift with temperature. We are developing a suite of photonic devices that leverage recent advances in telecom compatible light sources to fabricate cost-effective photonic temperature sensors, which can be deployed in a wide variety of settings ranging from controlled laboratory conditions, to the noisy environment of a factory floor or a residence. In this manuscript, we detail our protocol for the fabrication and testing of photonic thermometers.

We describe the process of fabrication and testing of photonic thermometers.

Herstellung und Prüfung von photonischen Thermometer

In recent years, a push for developing novel silicon photonic devices for telecommunications has generated a vast knowledge base that is now being ...

Simultaneous Measurement of HDAC1 and HDAC6 Activity in HeLa Cells Using UHPLC-MS

The search for new histone deacetylase (HDAC) inhibitors is of increasing interest in drug discovery. Isoform selectivity has been in the spotlight since the approval of romidepsin, a class I HDAC inhibitor for cancer therapy, and the clinical investigation of HDAC6-specific inhibitors for multiple myeloma. The present method is used to determine the inhibitory activity of test compounds on HDAC1 and HDAC6 in cells. The isoform activity is measured using the ultra-high-performance liquid chromatography &#8211; mass spectrometry (UHPLC-MS) analysis of specific substrates incubated with treated and untreated HeLa cells. The method has the advantage of reflecting the endogenous HDAC activity within the cell environment, in contrast to cell-free biochemical assays conducted on isolated isoforms. Moreover, because it is based on the quantification of synthetic substrates, the method does not require the antibody recognition of endogenous acetylated proteins. It is easily adaptable to several cell lines and an automated process. The method has already proved useful in finding HDAC6-selective compounds in neuroblasts. Representative results are shown here with the standard HDAC inhibitors trichostatin A (non-specific), MS275 (HDAC1-specific), and tubastatin A (HDAC6-specific) using HeLa cells.

The present method serves to identify isoform-specific inhibitors of histone deacetylases (HDAC) in HeLa cells by the UHPLC-MS analysis of multiple substrates. This is an antibody-free method developed to reflect HDAC1 and HDAC6 activity in the living cell environment, in contrast to single-isoform cell-free assays.

Gleichzeitige Messung von HDAC1 und HDAC6 Tätigkeit in HeLa-Zellen mit UHPLC-MS

The search for new histone deacetylase (HDAC) inhibitors is of increasing interest in drug discovery. Isoform selectivity has been in the spotlight since ...

DNA-magnetic Particle Binding Analysis by Dynamic and Electrophoretic Light Scattering

Isolation of DNA using magnetic particles is a field of high importance in biotechnology and molecular biology research. This protocol describes the evaluation of DNA-magnetic particles binding via dynamic light scattering (DLS) and electrophoretic light scattering (ELS). Analysis by DLS provides valuable information on the physicochemical properties of particles including particle size, polydispersity, and zeta potential. The latter describes the surface charge of the particle which plays major role in electrostatic binding of materials such as DNA. Here, a comparative analysis exploits three chemical modifications of nanoparticles and microparticles and their effects on DNA binding and elution. Chemical modifications by branched polyethylenimine, tetraethyl orthosilicate and (3-aminopropyl)triethoxysilane are investigated. Since DNA exhibits a negative charge, it is expected that zeta potential of particle surface will decrease upon binding of DNA. Forming of clusters should also affect particle size. In order to investigate the efficiency of these particles in isolation and elution of DNA, the particles are mixed with DNA in low pH (~6), high ionic strength and dehydration environment. Particles are washed on magnet and then DNA is eluted by Tris-HCl buffer (pH = 8). DNA copy number is estimated using quantitative polymerase chain reaction (PCR). Zeta potential, particle size, polydispersity and quantitative PCR data are evaluated and compared. DLS is an insightful and supporting method of analysis that adds a new perspective to the process of screening of particles for DNA isolation.

This protocol describes the synthesis of magnetic particles and evaluation of their DNA-binding properties via dynamic and electrophoretic light scattering. This method focuses on monitoring changes in particle size, their polydispersity and zeta potential of particle surface which play major role in binding of materials such as DNA.

DNA-Magnetpartikel verbindlich Analyse durch dynamische und elektrophoretische Lichtstreuung

Isolation of DNA using magnetic particles is a field of high importance in biotechnology and molecular biology research. This protocol describes the ...

Disentangling High Strength Copolymer Aramid Fibers to Enable the Determination of Their Mechanical Properties

Traditionally, soft body armor has been made from poly(p-phenylene terephthalamide) (PPTA) and ultra-high molecular weight polyethylene. However, to diversify the fiber choices in the United States body armor market, copolymer fibers based on the combination of 5-amino-2-(p-aminophenyl) benzimidazole (PBIA) and the more conventional PPTA were introduced. Little is known regarding the long-term stability of these fibers, but as condensation polymers, they are expected to have potential sensitivity to moisture and humidity. Therefore, characterizing the strength of the materials and understanding their vulnerability to environmental conditions is important for evaluating their use lifetime in safety applications. Ballistic resistance and other critical structural properties of these fibers are predicated on their strength. To accurately determine the strength of the individual fibers, it is necessary to disentangle them from the yarn without introducing any damage. Three aramid-based copolymer fibers were selected for the study. The fibers were washed with acetone followed by methanol to remove an organic coating that held the individual fibers in each yarn bundle together. This coating makes it difficult to separate single fibers from the yarn bundle for mechanical testing without damaging the fibers and affecting their strength. After washing, fourier transform infrared (FTIR) spectroscopy was performed on both washed and unwashed samples and the results were compared. This experiment has shown that there are no significant variations in the spectra of poly(p-phenylene-benzimidazole-terephthalamide-co-p-phenylene terephthalamide) (PBIA-co-PPTA1) and PBIA-co-PPTA3 after washing, and only a small variation in intensity for PBIA. This indicates that the acetone and methanol rinses are not adversely affecting the fibers and causing chemical degradation. Additionally, single fiber tensile testing was performed on the washed fibers to characterize their initial tensile strength and strain to failure, and compare those to other reported values. Iterative procedural development was necessary to find a successful method for performing tensile testing on these fibers.

The primary goal of the study is to develop a protocol to prepare consistent specimens for accurate mechanical testing of high strength copolymer aramid fibers, by removing a coating and disentangling the individual fiber strands without introducing significant chemical or physical degradation.

Entwirren hohe Festigkeit-Copolymer-Aramid-Fasern um die Bestimmung der mechanischen Eigenschaften ermöglichen

Traditionally, soft body armor has been made from poly(p-phenylene terephthalamide) (PPTA) and ultra-high molecular weight polyethylene. However, to ...

HPLC-Messung der DNA-Oxidation Biomarker, 8-oxo-7,8-dihydro-2'-Desoxyguanosin, in kultivierten Zellen und tierischen Geweben

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