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Hidi IJ, Jahn M, Weber K, Cialla-May D, Popp J. Droplet based microfluidics: spectroscopic characterization of levofloxacin and its SERS detection. Phys Chem Chem Phys 2015; 17:21236-42. [DOI: 10.1039/c4cp04970e] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The determination of the absorption behavior of levofloxacin (levaquin) on the surface of silver nanoparticles and its determination in aqueous solution by droplet based microfluidics combined with surface enhanced Raman spectroscopy.
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Geitner R, Kötteritzsch J, Siegmann M, Bocklitz TW, Hager MD, Schubert US, Gräfe S, Dietzek B, Schmitt M, Popp J. Two-dimensional Raman correlation spectroscopy reveals molecular structural changes during temperature-induced self-healing in polymers based on the Diels–Alder reaction. Phys Chem Chem Phys 2015; 17:22587-95. [DOI: 10.1039/c5cp02151k] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
For the first time two-dimensional Raman correlation analysis has been used to study self-healing polymers based on the Diels–Alder reaction.
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Bocklitz TW, Dörfer T, Heinke R, Schmitt M, Popp J. Spectrometer calibration protocol for Raman spectra recorded with different excitation wavelengths. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 149:544-9. [PMID: 25978023 DOI: 10.1016/j.saa.2015.04.079] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Revised: 04/22/2015] [Accepted: 04/25/2015] [Indexed: 05/21/2023]
Abstract
The combination of Raman spectroscopy with chemometrics has gained significant importance within the last years to address a broad variety of biomedical and life science questions. However, the routine application of chemometric models to analyze Raman spectra recorded with Raman devices different from the device used to establish the model is extremely challenging due to Raman device specific influences on the recorded Raman spectra. Here we report on the influence of different non-resonant excitation wavelengths on Raman spectra and propose a calibration routine, which corrects for the main part of the spectral differences between Raman spectra recorded with different (non-resonant) excitation wavelengths. The calibration routine introduced within this contribution is an improvement to the known 'standard' calibration routines and is a starting point for the development of a calibration protocol to generate spectrometer independent Raman spectra. The presented routine ensures that a chemometric model utilizes only Raman information of the sample and not artifacts from small shifts in the excitation wavelength. This is crucial for the application of Raman-spectroscopy in real-world-settings, such as diagnostics of diseases or identification of bacteria.
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Schneidewind H, Weber K, Zeisberger M, Hübner U, Dellith A, Cialla-May D, Mattheis R, Popp J. The effect of silver thickness on the enhancement of polymer based SERS substrates. NANOTECHNOLOGY 2014; 25:445203. [PMID: 25319270 DOI: 10.1088/0957-4484/25/44/445203] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We investigated silver-covered polymer based nanogratings as substrates for surface-enhanced Raman spectroscopy (SERS), in particular with respect to the thickness of the plasmonically active silver film. In order to obtain accurate geometrical input data for the simulation process, we inspected cross sections of the gratings prepared by breaking at cryogenic temperature. We noticed a strong dependence of the simulation results on geometrical variations of the structures. Measurements revealed that an increasing silver film thickness on top of the nanogratings leads to a blue shift of the plasmonic resonance, as predicted by numerical simulations, as well as to an increased field enhancement for an excitation at 488 nm. We found a clear deviation of the experimental data compared to the simulated results for very thin silver films due to an island-like growth at a silver thickness below 20 nm. In order to investigate the SERS activity. we carried out measurements with crystal violet as a model analyte at an excitation wavelength of 488 nm. The SERS enhancement increases up to a silver thickness of about 30 nm, whereas it remains nearly constant for thicker silver films.
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Lakner Z, Popp J. Place and role of food industry in modern economies. ACTA ALIMENTARIA 2014. [DOI: 10.1556/aalim.43.2014.suppl.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Meheretu GM, Cialla D, Popp J. Surface Enhanced Raman Spectroscopy on Silver Nanoparticles. ACTA ACUST UNITED AC 2014. [DOI: 10.13189/ijbb.2014.020403] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Pfeffer MG, Zedler L, Kupfer S, Paul M, Schwalbe M, Peuntinger K, Guldi DM, Guthmuller J, Popp J, Gräfe S, Dietzek B, Rau S. Tuning of photocatalytic activity by creating a tridentate coordination sphere for palladium. Dalton Trans 2014; 43:11676-86. [DOI: 10.1039/c4dt01034e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Donati A, Studer J, Petrillo S, Pocnet C, Popp J, Rossier J, von Gunten A. The evolution of personality in patients with mild cognitive impairment. Dement Geriatr Cogn Disord 2014; 36:329-39. [PMID: 24022337 DOI: 10.1159/000353895] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/16/2013] [Indexed: 11/19/2022] Open
Abstract
AIMS To describe personality traits and their changes in mild cognitive impairment (MCI) and control subjects. METHODS Sixty-three MCI and 90 control subjects were asked to describe their current personality traits by the Structured Interview for the Five-Factor Model (SIFFM). For each subject, a close relative retrospectively assessed these descriptions both as to the previous and current personality traits, using the Revised NEO Personality Inventory, Form R (NEO-PI-R). RESULTS Self-assessed MCI subjects reported significantly lower scores in the openness dimension than control subjects [F(1, 150) = 9.84, p = 0.002, ηp(2) = 0.06]. In current observer ratings, MCI subjects had higher scores on neuroticism [F(1, 137) = 7.55, p = 0.007, ηp(2) = 0.05] and lower ones on extraversion [F(1, 137) = 6.40, p = 0.013, ηp(2) = 0.04], openness [F(1, 137) = 9.93, p = 0.002, ηp(2) = 0.07], agreeableness [F(1, 137) = 10.18, p = 0.002, ηp(2) = 0.07] and conscientiousness [F(1, 137) = 25.96, p < 0.001, ηp(2) = 0.16]. Previous personality traits discriminated the groups as previous openness [odds ratio (OR) = 0.97, 95% confidence interval (CI) = 0.95-0.99, p = 0.014] and conscientiousness (OR = 0.96, 95% CI 0.94-0.98, p = 0.001) were negatively related to MCI group membership. In MCI subjects, conscientiousness [F(1, 137) = 19.20, p < 0.001, ηp(2) = 0.12] and extraversion [F(1, 137) = 22.27, p < 0.001, ηp(2) = 0.14] decreased between previous and current evaluations and neuroticism increased [F(1, 137) = 22.23, p < 0.001, ηp(2) = 0.14], whereas no significant change was found in control subjects. CONCLUSIONS MCI subjects undergo significant personality changes. Thus, personality assessment may aid the early detection of dementia.
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Elhawat N, Alshaal T, Domokos-Szabolcsy É, El-Ramady H, Márton L, Czakó M, Kátai J, Balogh P, Sztrik A, Molnár M, Popp J, Fári MG. Phytoaccumulation potentials of two biotechnologically propagated ecotypes of Arundo donax in copper-contaminated synthetic wastewater. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2014; 21:7773-7780. [PMID: 24638838 DOI: 10.1007/s11356-014-2736-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Accepted: 03/03/2014] [Indexed: 06/03/2023]
Abstract
An in vitro experiment was carried out to evaluate the phytoremediation potentials of two somatic embryo-derived ecotypes of Arundo donax-BL (American ecotype) and 20SZ (Hungarian ecotype)-of copper from synthetic wastewater. The two ecotypes were grown under sterile conditions in tubes containing a nutrient solution supplied with increasing doses of Cu (0, 1, 2, 3, 5, 10, and 26.8 mg L(-1)) for 6 weeks. The translocation and bioaccumulation factors and removal rate were estimated. In general, increasing Cu concentration in nutrient solution slightly decreased root, stem and leaf biomass without toxicity symptoms up to 26.8 mg L(-1). Moreover, both ecotypes showed high Cu removal efficiency from aqueous solution. However, Cu removal rate ranged between 96.6 to 98.8% for BL ecotype and 97 to 100% for 20SZ ecotype. Data illustrated that both BL and 20SZ ecotypes may be employed to treat Cu-contaminated water bodies up to 26.8 mg L(-1).
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Elhawat N, Alshaal T, Domokos-Szabolcsy É, El-Ramady H, Márton L, Czakó M, Kátai J, Balogh P, Sztrik A, Molnár M, Popp J, Fári MG. Phytoaccumulation potentials of two biotechnologically propagated ecotypes of Arundo donax in copper-contaminated synthetic wastewater. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2014. [PMID: 24638838 DOI: 10.1007/s11356-014-2736-8.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 09/29/2022]
Abstract
An in vitro experiment was carried out to evaluate the phytoremediation potentials of two somatic embryo-derived ecotypes of Arundo donax-BL (American ecotype) and 20SZ (Hungarian ecotype)-of copper from synthetic wastewater. The two ecotypes were grown under sterile conditions in tubes containing a nutrient solution supplied with increasing doses of Cu (0, 1, 2, 3, 5, 10, and 26.8 mg L(-1)) for 6 weeks. The translocation and bioaccumulation factors and removal rate were estimated. In general, increasing Cu concentration in nutrient solution slightly decreased root, stem and leaf biomass without toxicity symptoms up to 26.8 mg L(-1). Moreover, both ecotypes showed high Cu removal efficiency from aqueous solution. However, Cu removal rate ranged between 96.6 to 98.8% for BL ecotype and 97 to 100% for 20SZ ecotype. Data illustrated that both BL and 20SZ ecotypes may be employed to treat Cu-contaminated water bodies up to 26.8 mg L(-1).
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Bocklitz TW, Crecelius AC, Matthäus C, Tarcea N, von Eggeling F, Schmitt M, Schubert US, Popp J. Deeper understanding of biological tissue: quantitative correlation of MALDI-TOF and Raman imaging. Anal Chem 2013; 85:10829-34. [PMID: 24127731 DOI: 10.1021/ac402175c] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
In order to achieve a comprehensive description of biological tissue, spectral information about proteins, lipids, nucleic acids, and other biochemical components need to be obtained concurrently. Different analytical techniques may be combined to record complementary information of the same sample. Established techniques, which can be utilized to elucidate the biochemistry of tissue samples are, for instance, MALDI-TOF-MS and Raman microscopic imaging. With this contribution, we combine these two techniques for the first time. The combination of both techniques allows the utilization and interpretation of complementary information (i.e., the information about the protein composition derived from the Raman spectra with data of the lipids analyzed by the MALDI-TOF measurements). Furthermore, we demonstrate how spectral information from MALDI-TOF experiments can be utilized to interpret Raman spectra.
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Heuke S, Vogler N, Meyer T, Akimov D, Kluschke F, Röwert-Huber HJ, Lademann J, Dietzek B, Popp J. Multimodal mapping of human skin. Br J Dermatol 2013; 169:794-803. [DOI: 10.1111/bjd.12427] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/05/2013] [Indexed: 01/20/2023]
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Jansen G, Popp J, Dietrich U, Mertzlufft F, Bach F. [Traumatic dissection of the carotid artery: challenges for diagnostics and therapy illustrated by a case example]. Anaesthesist 2013; 62:817-23. [PMID: 24057761 DOI: 10.1007/s00101-013-2243-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Revised: 08/28/2013] [Accepted: 08/28/2013] [Indexed: 11/24/2022]
Abstract
Traumatic dissection of the carotid artery is an easily overlooked consequence of trauma with notable morbidity and mortality which can be observed in up to 4% of cases involving multiple trauma. Certain mechanisms and patterns of injury as well as specific symptoms should serve as indicators of a dissection and should therefore result in further diagnostic measures. An early diagnosis is of major relevance. This report describes the case of a 45-year-old victim of a traffic accident who showed symptoms of a dissection which had initially not been diagnosed.
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Popp J, Krischek C, Janisch S, Wicke M, Klein G. Physico-chemical and microbiological properties of raw fermented sausages are not influenced by color differences of turkey breast meat. Poult Sci 2013; 92:1366-75. [DOI: 10.3382/ps.2012-02724] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Schmitt M, Dietzek B, Neugebauer U, Krafft C, Rösch P, Popp J. Raman-Spektroskopie – der Weg zu einer labelfreien biomedizinischen Diagnostik. ACTA ACUST UNITED AC 2012. [DOI: 10.1055/s-0032-1325591] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Neugebauer U, Assmann C, Schröder U, Ramoji A, Glaser U, Beleites C, Pfister W, Popp J, Bauer M. Raman spectroscopic investigation of the interaction of Enterococcus faecalis and vancomycin: towards a culture-independent antibiotic susceptibility test. Crit Care 2012. [PMCID: PMC3504886 DOI: 10.1186/cc11772] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Stöckel S, Meisel S, Elschner M, Rösch P, Popp J. Identification of Bacillus anthracis via Raman Spectroscopy and Chemometric Approaches. Anal Chem 2012; 84:9873-80. [DOI: 10.1021/ac302250t] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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43
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Neugebauer U, Große C, Bauer M, Kemper B, Barroso-Pena A, Bauwens A, Glueder M, Woerdemann M, Dewenter L, Denz C, Kloß S, Rösch P, Sabat A, Schütze K, Friedrich A, Bally GV, Popp J, Mellmann A. From Infection to Detection: Imaging S. aureus – host interactions. ACTA ACUST UNITED AC 2012. [DOI: 10.1515/bmt-2012-4284] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Neugebauer U, März A, Henkel T, Schmitt M, Popp J. Spectroscopic detection and quantification of heme and heme degradation products. Anal Bioanal Chem 2012; 404:2819-29. [PMID: 22903430 DOI: 10.1007/s00216-012-6288-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Revised: 07/17/2012] [Accepted: 07/19/2012] [Indexed: 10/28/2022]
Abstract
Heme and heme degradation products play critical roles in numerous biological phenomena which until now have only been partially understood. One reason for this is the very low concentrations at which free heme, its complexes and the partly unstable degradation products occur in living cells. Therefore, powerful and specific detection methods are needed. In this contribution, the potential of nondestructive Raman spectroscopy for the detection, quantification and discrimination of heme and heme degradation products is investigated. Resonance Raman spectroscopy using different excitation wavelengths (413, 476, 532, and 752 nm) is employed to estimate the limit of detection for hemin, myoglobin, biliverdin, and bilirubin. Concentrations in the low micromolar range (down to 3 μmol/L) could be reliably detected when utilizing the resonance enhancement effect. Furthermore, a systematic study on the surface-enhanced Raman spectroscopy (SERS) detection of hemin in the presence of other cellular components, such as the highly similar cytochrome c, DNA, and the important antioxidant glutathione, is presented. A microfluidic device was used to reproducibly create a segmented flow of aqueous droplets and oil compartments. Those aqueous droplets acted as model chambers where the analytes have to compete for the colloid. With the help of statistical analysis, it was possible to detect and differentiate the pure substances as well as the binary mixtures and gain insights into their interaction.
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Stöckel S, Meisel S, Elschner M, Rösch P, Popp J. Raman spectroscopic detection of anthrax endospores in powder samples. Angew Chem Int Ed Engl 2012; 51:5339-42. [PMID: 22505355 PMCID: PMC3470700 DOI: 10.1002/anie.201201266] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Indexed: 11/08/2022]
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Stöckel S, Meisel S, Elschner M, Rösch P, Popp J. Raman-spektroskopische Detektion von Anthrax-Endosporen in Pulverproben. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201201266] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Zierbock S, Plettenberg H, Schmitt M, Liebold S, Hoffmann M, Popp J. NIR spectroscopic analyses of chemical osteoarthritic cartilage models. BIOMED ENG-BIOMED TE 2012. [DOI: 10.1515/bmt-2012-4089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Jahn M, Zierbock S, Cialla D, Weber K, Popp J. Bottom-up nanostructured metallic surfaces for SERS detection of low-molecular weight substances. BIOMED ENG-BIOMED TE 2012. [DOI: 10.1515/bmt-2012-4094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Seise B, Csaki A, Schwuchow A, Fritzsche W, Weber K, Cialla D, Popp J. Microstructured optical fibre as biosensor for pathogen detection on DNA-level. ACTA ACUST UNITED AC 2012. [DOI: 10.1515/bmt-2012-4136] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Cialla D, Weber K, Popp J, Hübner U, Schneidewind H, Zeisberger M, Mattheis R. Innovative plasmonic nanostructures as biosensor for DNA detection. BIOMED ENG-BIOMED TE 2012. [DOI: 10.1515/bmt-2012-4117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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