Analytische Chemie
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Eingeladener Vortrag
- nein (369)
Ausgehend von dem in der Literatur beschriebenen Verfahren zur Bestimmung aromatischer Aminosäuren konnte eine Analysemethode zur Proteinbestimmung über die optische Detektion von Tyrosin und Phenylalanin nach chromatographischer Trennung der Protein-Hydrolysate entwickelt werden, die gegenüber dem Verfahren aus der Literatur erhebliche Vorteile besitzt. Der Einsatz von Rundbodenvials stellt eine Neuerung und kostengünstige Alternative zu der konventionellen Hydrolyse in Vakuumhydrolyseröhrchen wie auch zu den Mikrowellenvials der Mikrowellenhydrolyse dar, die das Potential für Miniaturisierungen der Proben hat und sich zudem für große Probendurchsätze eignet. Anstelle der Mikrowellenheizungen wurde ein konventionelles Ölbad als Heizquelle verwendet. Somit ergibt sich eine Verbesserung auch darin, dass diese Methode geringere Geräteinvestitionen erfordert. Wie die Ergebnisse nahelegen, sind sowohl Salzsäure als auch Bromwasserstoffsäure geeignete Reagenzien, die bei der sauren Hydrolyse von Proteinen verwendet werden können. Mit Hilfe antioxidativer Zusätze können Nebenreaktionen erfolgreich vermieden werden. Hier haben sich L-Cystein und Oxalsäure als wirkungsvolle Additive herausgestellt. Wichtige Verbesserungen betreffen vor allem die Zeitersparnis bei der Hydrolyse, die Aufarbeitung der Hydrolysate und die chromatographischen Separationen. Erstere konnte gegenüber der konventionellen Methode von 22 Stunden auf 45 Minuten reduziert werden. Die chromatographische Trennung wurde so weit optimiert, dass die Laufzeit von 64 auf 35 Minuten verkürzt werden konnte. Zudem konnte auf das zeitraubende und kontaminationsanfällige Eindampfen der Hydrolysate verzichtet werden. Während der Aufarbeitung der Hydrolysate konnten die Menge eingesetzter Chemikalien reduziert und damit mögliche Störungen während der optischen Detektion verringert werden. Letztere wurde zum einen durch das Einbeziehen der UV-Absorption bei 260 nm erweitert, sodass eine Alternative zur Absorption bei 215 nm vorliegt, die ebenere Basislinien im Chromatogramm ermöglicht. Zum anderen wurde gezeigt, dass mit Hilfe der Fluoreszenz die Empfindlichkeit der Methode gegenüber der UV-Absorption erheblich verbessert werden kann. Anhand der Probe eines Birkenpollenextraktes ließ sich die Anwendbarkeit der optimierten Methode auf Realproben demonstrieren.
In this thesis a protocol based on a direct competitive and non-competitive immunoassay using the microarray format was developed to screen emulated hybridoma supernatants against the drug carbamazepine (CBZ). As support, epoxy slides were manufactured by coating microscope glass slides with epoxy silanes. The manufactured epoxy slides showed similar capacity for protein immobilization as commercially available NEXTERION slides, but showed a higher autofluorescence background. On the epoxy slides, protein A, Cys-A, G and Cys-G were immobilized as antibody capturing coating. It could be shown that the Cys-tag considerably increased the immobilization of all compared proteins, especially of protein G. Protein Cys-G immobilized at pH 8-9 was considered the most suitable protein for antibody immobilization due to good spot uniformity and a high binding capacity for IgG. Additionally, in immobilization experiments it could be shown, that 10-500 fold excess of bovine IgG, introduced by two different fetal bovine serum (FBS) products, showed no significant competition on the immobilization of mice or goat IgG on protein Cys-G. To examine the captured antibodies for affinity to CBZ, the CBZ-TOTA-DY654 tracer was custom synthesized. It could be demonstrated, that the tracer antibody interaction was competitive with the tracer precursor, CBZ-TOTA-NH2 and CBZ. Furthermore, the synthesized tracer was also successfully used by externals to evaluate CBZ affine hybriodoma cells in flow cytometry. In the simulated screening, five antibodies with known affinity to CBZ were diluted in a cell culture medium. The screening method allowed to differentiate between affine antibodies (IC50 < 20 µg/ml) and unaffine antibodies (IC50 > 20 µg/ml), when concentrations of 0.1 µg/ml IgG or greater have been used. Of five applied antibodies, all highly affine clones (CE2 and B3212M) were reported as positives while no false-positive samples were observed. The screening included competitive, with around 89500 fold excess of CBZ, and non-competitive tracer incubation on different segments of the same chip, which resulted in total signal suppression on the competitive segment. The screening was performed in 20 hours, only a few nanoliters, of each simulated supernatant, were consumed in the screening process, furthermore in the method standard 96 well MTPs were used and no cleanroom facilities were required.
Im Rahmen eines BMWi Projekts der Fa. Innovent Jena, bei dem ein neuartiger optischer Sensor zur Bewertung der Oberflächenqualität und Reinheit von optischen Gläsern im Fokus stand, wurden die abbildende Ellipsometrie, die IR-Mikroskopie und die Weißlichtinterferenzmikroskopie als Referenzverfahren herangezogen. Mittels Brewster-Winkelmessungen konnten „Wolkenstrukturen“ identifiziert werden, die bei nachfolgenden Beschichtungsprozessen zu Schichtdefekten führen können. Außerdem wurden mittels Ellipsometrie Änderungen im Brechungsindex der Floatgläser (Luft- bzw. Zinnseite) nachgewiesen. Topographie Oberflächenmerkmale wie Welligkeit, Rauheit und Kreuzrillen konnten mittels Weißlichtinterferenzmikroskopie bzw. abbildender Ellipsometrie identifiziert werden.
Das Projekt KONTRAST adressiert die Qualitätskontrolle (QC) zur Erfassung nano- und mikroskaliger Belegung/Degradation mittels abbildender Ellipsometrie (IE). Das BAM-Teilvorhaben beinhaltet das Screening von Benchmark-Materialsystemen und die Validierung von Messstrategien. Im Ergebnis erfolgte eine Fokussierung auf das im Vergleich zur off Null Ellipsometrie (ONE) aussichtereichere Verfahren der referenzkompensierten Ellipsometrie(RKE), das marktstrategisch in RSE (referenced spectral ellipsometry) umbenannt wurde. Alle Materialsysteme der BAM-Unterauftragnehmer konnten mit IE visualisiert werden, mit dem RSE-System in wesentlich kürzeren Zeiten, auf größeren Flächen, bei vergleichbarer Empfindlichkeit und Auflösung, Komplementärverfahren waren für den schnellen Nachweis nano- und mikroskaliger Belegung nicht konkurrenzfähig, wobei zusätzliche Materialsysteme mit niedrigem Kontrast (SnO:Ni auf Glas bzw. Cr auf Chromstahl) in der BAM hergestellt wurden. Die öffentliche Präsentation des RSE-Prototyps erfolgte auf der ICSE-7 2016 mit der Publikation 2017 in Applied Surface Science.
Aufzählung der wichtigsten wissenschaftlich-technischen und anderer wesentlicher Ergebnisse
• ALD Abscheidungen auf Polymeren (PE, PP, PTFE) unter Atmosphärendruck und im Vakuum mit Ozon als Oxidationsmittel wurden durchgeführt:
- Mit Variation der Schichtdicke
- Mit Variation der Zykluszeit
- Mit und ohne Ozon Vorbehandlung der Oberfläche
• ALD Abscheidungen auf (PE, PP, PTFE) in Vakuum mit O2- und H2-Plasma Vorbehandlung wurden durchgeführt.
- Mit Variation der Schichtdicke
- Mit Variation der Zykluszeit
- Mit und ohne Plasma Vorbehandlung der Oberfläche
• Die ALD Prozesse wurden mit in situ Laserellipsometrie untersucht.
• Die ALD Schichten wurden für die Haftfestigkeit bei der BAM ausgewerte
Additive Manufacturing provides an important enabling technology for the digital transformation of the economy. As an emerging technology it has seen a remarkable development over the last three decades. Nevertheless, it is far from a broad adoption with several barriers to overcome yet. One of the major challenges is the lack of standards. The critical role of standardization for innovation is generally recognized, still the topic too often has been neglected in strategic roadmapping exercises for emerging technologies. Too little is known about the complex dynamics and interrelations of standardization and innovation. The anticipation of standardization needs and the timely and efficient implementation of standards is challenging. This paper aims at contributing to a better understanding of the role that standards play in the multi-dimensional system of innovation. It analyzes the trajectories of innovation in Additive Manufacturing in a systematic and holistic way, focusing on standardization activities with regard to coordination, stakeholders involved, the timing and types of standards developed. Putting standardization in context of the multi-dimensional innovation system of Additive Manufacturing the research shows where standards can support the diffusion of an emerging technology.
Leaking methane (CH4) from infrastructures, such as pipelines and landfills, is critical for the environment but can also pose a safety risk. To enable a fast detection and localization of these kind of leaks, we developed a novel robotic platform for aerial remote gas sensing. Spectroscopic measurement methods for remote sensing of selected gases lend themselves for use on mini-copters, which offer a number of advantages for inspection and surveillance over traditional methods. No direct contact with the target gas is needed and thus the influence of the aerial platform on the measured gas plume can be kept to a minimum. This allows to overcome one of the major issues with gas-sensitive mini-copters. On the other hand, remote gas sensors, most prominently Tunable Diode Laser Absorption Spectroscopy (TDLAS) sensors have been too bulky given the payload and energy restrictions of mini-copters. Here, we present the Unmanned Aerial Vehicle for Remote Gas Sensing (UAV-REGAS), which combines a novel lightweight TDLAS sensor with a 3-axis aerial stabilization gimbal for aiming on a versatile hexacopter. The proposed system can be deployed in scenarios that cannot be addressed by currently available robots and thus constitutes a significant step forward for the field of Mobile Robot Olfaction (MRO). It enables tomographic reconstruction of gas plumes and a localization of gas sources. We also present first results showing its performance under realistic conditions.
Im deutschen Eisenbahnnetz sind ca. 80 Millionen Spannbetonschwellen verbaut. Analog zu anderen Bauwerken werden Wpannbetonschwellen regelmäßig visuell inspiziert. Die Rissbildung ist bei diesen Inspektionen ein Kriterium für die Schädigung einer Spannbetonschwelle. Durch Rissbildung kann es passieren, dass Betonschwellen ihre Nutzungsdauer nicht erreichen.
Isotope amount ratios (hereafter referred to as simply isotope ratios) are proving useful in an ever increasing array of applications that range from studies unravelling transport processes, to pinpointing the provenance of specific samples as well as trace element quantification by using isotope dilution mass spectrometry (IDMS). These expanding applications encompass fields as diverse as archaeology, food chemistry, forensic science, geochemistry, medicine and metrology. However, to be effective tools, the isotope ratio data must be reliable and traceable to enable the comparability of measurement.
The importance of traceability and comparability in isotope ratio analysis has already been recognized by the Inorganic Analysis Working Group (IAWG) within the CCQM. Three pilot studies have focused on the quality of isotope ratio determinations (P48 “U isotope ratios in urine”, P75 “stable isotopes in Methionine”, P105 “87Sr/86Sr in wine”). Moreover, isotope ratio measurements are fundamental to IDMS amount of substance determinations. For example, when Pb quantification using IDMS is undertaken, this requires the measurements of Pb isotope ratios. While the requirements for isotope ratio accuracy and precision in the case of of IDMS are generally quite modest, “absolute” Pb isotope ratio measurements for geochemical age dating and source rock characterization as well as forensic provenance and fingerprinting studies require Pb isotope ratio measurements of the highest quality. To support present and future CMCs on isotope ratio determinations, a Key Comparison was urgently needed. Therefore, it was decided at the IAWG meeting in Paris in April 2011 that a Key Comparison on the determination of Pb isotope ratios in a pure Pb solution and in a bronze sample should be organized and accompanied by a pilot study.
Measuring Pb isotope amount ratios in a pure Pb solution, while seemingly straight forward, rigorously tests the ability of analyst to correct for any instrumental effects (such as mass discrimination and blank correction) on the measured ratios. Pb, present in trace amounts in a metal matrix sample (e.g. Pb in bronze), provides a real world test of the whole chemical and instrumental procedure, from chemical separation and sample purification to analysis and subsequent correction of appropriate instrumental effects on the separated samples.
A suitable bronze material with a Pb mass fraction between 10 and 100 mg·kg-1 was available at BAM. A high purity solution of Pb with a mass fraction of approximately 100 mg·kg-1 was also available. By comparing the Pb isotope ratio results obtained for the bronze sample with the Pb isotope ratio results from the Pb solution, potential biases arising from the processing of the bronze sample could be effectively identified and separated from the instrumental effects arising from the measurement and data processing protocol.
The efficiency of gas sensor application for facilitating the safe use of hydrogen depends considerably on the sensor response to a change in hydrogen concentration. Therefore, the response time has been measured for five different-type commercially available hydrogen sensors. Experiments showed that all these sensors surpass the ISO 26142 standard; for the response times t90 values of 2 s to 16 s were estimated. Results can be fitted with an exponential or sigmoidal function. It can be demonstrated that the results on transient behaviour depend on both the operating parameters of sensors and Investigation methods, as well as on the experimental conditions: gas change rate and concentration jump.