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Organisationseinheit der BAM
- 1 Analytische Chemie; Referenzmaterialien (1471) (entfernen)
Paper des Monats
- ja (14)
Faecal contaminants in water are considered serious threats for human health, due to the presence of viruses, bacteria and other harmful microorganisms.1 Urobilin (UB) is a well-known faecal pigment and can be used as a marker for faecal matter in water.2 UB is commonly present in the urine of all mammals as the catabolic end product of bilirubin degradation.2 As the only simple chemical approach to its detection, Schlesinger’s test is usually used to enhance the weak fluorescence of UB in alcoholic media by complexation with Zinc.2, 3 The major limitation of this method is the only weak enhancement of the intrinsically weak UB fluorescence in aqueous media.3 This work presents an approach to introduce different Zn salts for improved fluorescence response, where we found a clear dependence of the fluorescence yield of UB-Zn(II) complexes on the counterion of the salt in water. By employing a combination of fluorescence parameters like transition energy, fluorescence intensity, and fluorescence lifetime, a photophysical understanding of the structure and conformation of the UB-Zn(II) complexes responsible for the fluorescence enhancement in water could be gained. The possibilities of developing a sensitive analytical method based on the acquired understanding are also discussed.
Therapeutic monoclonal antibodies are the fastest-growing group of biological agents which generated a yearly turnover of USD 210 billion in 2022 and whose sales are expected to grow by 10% annually over the next 10 years. With steadily increasing market importance, analytical methods for reliable quantification of therapeutic antibodies also become more and more relevant. Liquid chromatography coupled with tandem mass spectrometry (LC–MS/MS) has become the main technology for antibody quantification. This approach, however, requires enzymatic digestion of the intact protein into peptides, for which a wide range of different protocols exists that often lead to different results depending on the digestion procedure or trypsin variants used. In particular, the amount and type of detergents added for protein unfolding prior to digestion is known to create significant bias in measurement results. The overall goal of the presented project is the application of novel thermostable and surface-functionalized trypsin particles for improved antibody digestion. Specifically, a trypsin-variant described in the literature exhibiting increased activity and thermal stability above 80°C, will be examined. The application of this enzyme should allow to perform digestion at elevated temperatures where the protein is naturally unfolding thereby increasing enzyme accessibility without the need for detergents. Furthermore, we will immobilize the thermostable trypsin onto the surface to further enhance enzyme stability, prevent self-digestion, and enable separation of trypsin from target peptides before LC–MS/MS analysis. As an immobilization platform, cheap and non-porous corundum particles will be used as these show high chemical stability and low levels of interaction of matrix proteins with the functionalized surface. adsorption. In a multidisciplinary collaboration with the SALSA Photonics Lab, we will investigate the characteristics of covalent enzyme binding and unspecific peptide binding using an interface-sensitive analytical tool, vibrational sum-frequency generation (VSFG) spectroscopy. The insights gained will not only lead to new competencies in peptide and enzyme surface analysis using VSFG spectroscopy in SALSA but will also significantly contribute to optimizing antibody quantification.
In this study, we demonstrate the applicability of nitrogen microwave inductively coupled atmospheric pressure mass spectrometry (MICAP-MS) for Ca, Fe, and Se quantification in human serum using isotope dilution (ID) analysis. The matrix tolerance of MICAP-MS in Na matrix was investigated, uncovering that high Na levels can suppress the signal intensity. This suppression is likely due to the plasma loading and the space charge effect. Moreover, 40Ca and 44Ca isotopic fractionation was noted at elevated Na concentration. Nine certified serum samples were analyzed using both external calibration and ID analysis. Overestimation of Cr, Zn, As, and Se was found in the results of external calibration, which might be resulted from C-induced polyatomic interference and signal enhancement, respectively. Further investigations performed with methanol showed a similar enhancement effect for Zn, As, and Se, potentially supporting this assumption. The mass concentrations determined with ID analysis show metrological compatibility with the reference values, indicating that MICAP-MS combined with ID analysis can be a promising method for precise Ca, Fe, and Se determination. Moreover, this combination reduces the influences of matrix effects, broadening the applicability of MICAP-MS for samples with complex matrix.
Antikörper sind in der medizinischen Welt nicht mehr wegzudenken. Ihr Einsatz-Repertoire als Therapeutika für die Behandlung diverser Krankheiten und Infektionen weitet sich von Jahr zu Jahr mehr aus. Dabei basiert ein Großteil der verwendeten Antikörper zu diesem Zeitpunkt auf monoklonalen Antikörpern auf Basis von Hybridomazellen. Doch hier könnten rekombinante Antikörper aufgrund ihrer Vektor-basierten Expression eine vielversprechende und womöglich sogar revolutionierende Alternative bieten. So ergeben sich neue Optimierungsoptionen für Merkmale wie Affinität, Stabilität und Kompatibilität über Anpassungen auf genetischer oder posttranslationaler Ebene. Allerdings ergibt sich kein Anwendungszweck ohne die vorhergehende detaillierte Charakterisierung der Antikörper. Denn nur mit spezifischem Wissen über die diversen Eigenschaften und Wechselwirkungen kann eine effektive und präzise Verwendung in der Diagnostik und Therapeutik gewährleistet werden und auf diese Weise Leben retten.
Aus diesem Grund beschäftigt sich diese Masterarbeit mit der Vertiefung der rekombinanten Antikörper-Thematik. Dazu soll ein Anti-Tetanus-Antikörper erstmals rekombinant in verschiedenen Zelllinien hergestellt und anschließend über umfangreiche analytische Verfahren mit einem Fokus auf die Einflussanalyse der unterschiedlichen posttranslationalen Glykosylierungen charakterisiert werden. Zu diesem Zweck wurden als Grundlage einerseits zwei P1316-Dual-Expressions-Vektoren mit variierenden Insert-Positionen der schweren und leichten Kette durch Gibson-Assembly sowie individuellen pRK5-Plasmide für eine separiert Expression der Antikkörperketten mithilfe Restriktionsfragment-Ligation generiert. In einer Gegenüberstellung der der Expressionsausbeuten stellte sich die Überlegenheit der P1316-Plasmid-Konfiguration heraus, in der das Leichtketten-Insert an der ersten Expressionsstelle positioniert ist. Deshalb wurde dieser Vektor als Ausgangspunkt für die anschließende hochskalierten Herstellung des Anti-Tetanus-Antikörpers in Expi293F-GnTI- und ExpiCHO-S-Zellen verwendet. Ein ELISA bestätigte die Bindungsaktivität der rekombinanten Antikörper am Tetanus-Toxoid unabhängig vom Expressionssystem. Nach einer folgenden Optimierung der für die Aufreinigung verwendeten Protein-A-Affinitätschromatographie, wurde über weitere Charakterisierungsmethoden wie Größenausschlusschromatographie und dynamische Lichtstreuung eine vergleichbare Aggregation aufgrund der sauren Elution aufgezeigt. In diesem Kontext wurde die Notwendigkeit einer Zweistufen-Präparation mit Affinitäts- und Größenausschlusschromatografie für den Erhalt monodisperser Proben verdeutlicht. Zudem wurden die verschiedenen intakten Massen mitsamt ihrer spezifischen Glykan-abhängigen Streumaßen in Relation zum monoklonalen NISTmAB-Referenzantikörper bestimmt. Dabei konnte den Erwartungen nach sowohl die geringere Masse als auch die uniformere Glykosylierung der in Expi293 GnTI- exprimierten Immunoglobuline in Relation zum ExpiCHO-S-Antikörper nachgewiesen werden. Anschließend wurde das Stabilitätsverhalten mittels thermischer Entfaltung und dynamischer Lichtstreuung über einen ausgeweiteten Zeitraum sowie verschiedenen Temperaturen dokumentiert. Grundlegend wurde eine höhere thermische Stabilität der zweiten konstanten Schwerketten-Domäne des aus ExpiCHO-S-Zellen stammenden Antikörpers nachgewiesen. Außerdem konnte eine problemlose Lagerungsfähigkeit beider unterschiedlich glykosylierter Antikörper bei Raumtemperatur für mindestens 4 Wochen festgestellt werden. Des Weiteren wurde die Langzeitlagerung im Rahmen der Auswirkung von Gefrier-Auftau-Zyklen mit gleichbleibenden Methoden sowie zusätzlicher Größenausschlusschromatographie erprobt. Hierbei stellte sich der Erhalt der strukturellen Integrität nach bis zu 15 Zyklen heraus. Allerdings geht die Monodispersität bereits nach wenigen Zyklen verloren, wobei die geringfügiger glykosylierten Expi293F-GnTI-Anti-Tetanus-Antikörper eine stärkere Beeinträchtigung durch multiple Gefrier-Auftau-Zyklen aufwiesen.
qNMR - The handbook
(2023)
Quantitative NMR (qNMR) has been around for a long time, but also has great potential to solve future problems in any quantitative analysis. As a primary method, it differs fundamentally from chromatographic methods: it is better described as a quantum mechanical balance. Succesful implementation of qNMR requires certain attention to detail. "qNMR - the handbook" is intended to be a guide for analysts to help understand the fundamental principles of NMR and the significant points relating to its implementation for quantitation. Regulatory considerations of qNMR adoption are explained. NMR fundamentals are explained to provide understanding. Together with many useful examples, the book is a compelling addition to the laboratory's reference library, providing all the tools that any practitioner should know to successfully implement qNMR.
The authors are qNMR pioneers and come from a variety of backgrounds including business, government and academia.
In situ chemical analysis of duplex stainless steel weld by laser induced breakdown spectroscopy
(2024)
The high corrosion resistance and good mechanical properties of duplex stainless steel (DSS) are due to its special chemical composition, which is a balanced phase ratio of ferrite (α) and austenite (γ). Many industrial applications require the integration of DSS components. For this, Gas tungsten arc welding (GTAW) is an excellent choice, as it allows an automated operation with high reproducibility. However, when the weld pool solidifies, critical ratios of α- and γ- phases can occur, which lead to solidification cracking, increased susceptibility to corrosion, and a decrease in ductility and critical strength. Previous studies have shown that these defects can be caused by the accumulation of manganese and chromium in the heat affected zone (HAZ), requiring ongoing monitoring of this accumulation. A suitable method for such monitoring is laser-induced breakdown spectroscopy (LIBS), which can be used in two operating modes: calibration using standard reference samples and calibration-free. Unlike conventional quantitative LIBS measurements, which require reference samples to generate a calibration curve, calibration-free LIBS (CF-LIBS) allows chemical compositions to be determined solely from the emission spectrum of the plasma. Numerous publications show that CF-LIBS is a fast and efficient analytical method for the quantitative analysis of metal samples. In this work, CF-LIBS is applied to spectra obtained during GTAW DSS welding and the result is compared with those obtained by PLS analysis. A good correlation was found between both types of analysis, demonstrating the suitability of the CF-LIBS method for this application. The CF-LIBS method has a significant advantage over conventional LIBS due to the rapid in situ measurement of concentrations of major alloying elements without calibration procedure. This, combined with fast feedback and appropriate adjustment of welding parameters, helps prevent welding defects.
Heterogeneous sandwich immunoassays are widely used for biomarker detection in bioanalysis and medical diagnostics. The high analyte sensitivity of the current “gold standard” enzyme-linked immunosorbent assay (ELISA) originates from the signal-generating enzymatic amplification step, yielding a high number of optically detectable reporter molecules. For future point-of-care testing (POCT) and point-of-need applications, there is an increasing interest in more simple detection strategies that circumvent time-consuming and temperature-dependent enzymatic reactions. A common concept to aim for detection limits comparable to those of enzymatic amplification reactions is the usage of polymer nanoparticles (NP) stained with a large number of chromophores. We explored different simple NP-based signal amplification strategies for heterogeneous sandwich immunoassays
that rely on an extraction-triggered release step of different types of optically detectable reporters. Therefore, streptavidinfunctionalized polystyrene particles (PSP) are utilized as carriers for (i) the fluorescent dye coumarin 153 (C153) and (ii) hemin (hem) molecules catalyzing the luminol reaction enabling chemiluminescence (CL) detection. Additionally, (iii) NP labeling with hemin-based microperoxidase MP11 was assessed. For each amplification approach, the PSP was first systematically optimized regarding size, loading concentration, and surface chemistry. Then, for an immunoassay for the inflammation marker C- eactive protein (CRP), the analyte sensitivity achievable with optimized PSP
ystems was compared with the established ELISA concept for photometric and CL detection. Careful optimization led to a limit of detection (LOD) of 0.1 ng/mL for MP11-labeled PSP and CL detection, performing similarly well to a photometric ELISA (0.13 ng/mL), which demonstrates the huge potential of our novel assay concept.
SWIR luminescent nanomaterials – key chemical parameters for bright probes for in vivo bioimaging
(2024)
A current challenge for studying physio-pathological phenomena and diseaserelated processes in living organisms with non-invasive optical bioimaging is the development of bright optical reporters that enable deep tissue penetration, a high detection sensitivity, and a high spatial and temporal resolution. The focus of this project are nanomaterials, which absorb and emit in the shortwave infrared (SWIR) between ~900–2500 nm where scattering, absorption, and autofluorescence of the tissue are strongly reduced compared to the visible and NIR.
The frequency-domain (FD) method provides an alternative to the commonly used time-domain (TD) approach in characterizing the luminescence kinetics of luminophores, with its own strengths, e.g., the capability to decouple multiple lifetime components with higher reliability and accuracy. While extensively explored for characterizing luminophores with down-shifted emission, this method has not been investigated for studying nonlinear luminescent materials such as lanthanide-doped upconversion nanoparticles (UCNPs), featuring more complicated kinetics. In this work, employing a simplified rate-equation model representing a standard two-photon energy-transfer upconversion process, we thoroughly analyzed the response of the luminescence of UCNPs in the FD method. We found that the FD method can potentially obtain from a single experiment the effective decay rates of three critical energy states of the sensitizer/activator ions involved in the upconversion process. The validity of the FD method is demonstrated by experimental data, agreeing reasonably well with the results obtained by TD methods.
Four donor-acceptor boron difluoride complexes based on the carbazole electron donor and the [1,3,5,2]oxadiazaborinino[3,4-a][1,8]naphthyridine acceptor were designed, synthesized, and systematically spectroscopically investigated in solutions, in the solid states, and dye-doped polymer films. The dyes exhibit an intense blue to red solid-state emission with photoluminescence quantum yields of up to 56% in pure dye samples and 86% in poly(methyl methacrylate) films. All boron complexes show aggregation-induced emission and reversible mechanofluorochromism. The optical properties of these dyes and their solid state luminescence can be tuned by substitution pattern, i.e., the substituents at the naphthyridine unit. Exchange of CH3- for CF3-groups does not only increase the intramolecular charge transfer character, but also provides a crystallization-induced emission enhancement.