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Maldi-tof identification

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https://www.readbyqxmd.com/read/28108794/maldi-tof-short-incubation-identification-from-blood-cultures-is-associated-with-reduced-length-of-hospitalization-and-a-decrease-in-bacteremia-associated-mortality
#1
J A Delport, A Strikwerda, A Armstrong, D Schaus, M John
The purpose of this study was to assess the impact of MALDI-ToF identification and rapid short incubation MALDI-Tof identification protocol on patient care compared to conventional identification. By using a retrospective review we assessed the impact of a rapid Bruker MALDI-Tof identification protocol. Overall there was a 16.76-hour reduction in time to identification of the pathogen after the introduction of MALDI-TOF identification in 2013 (P<0.0001) and a further 15-hour reduction (P<9.37 E-05) after implementation of the short incubation MALDI-TOF identification protocol in 2014...
January 20, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28108323/custom-database-development-and-biomarker-discovery-methods-for-maldi-tof-mass-spectrometry-based-identification-of-high-consequence-bacterial-pathogens
#2
Dobryan M Tracz, Andrea D Tyler, Ian Cunningham, Kym S Antonation, Cindi R Corbett
A high-quality custom database of MALDI-TOF mass spectral profiles was developed with the goal of improving clinical diagnostic identification of high-consequence bacterial pathogens. A biomarker discovery method is presented for identifying and evaluating MALDI-TOF MS spectra to potentially differentiate biothreat bacteria from less-pathogenic near-neighbour species.
January 17, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/28108122/-fast-methods-of-fungal-and-bacterial-identification-maldi-tof-mass-spectrometry-chromogenic-media
#3
María Siller-Ruiz, Sara Hernández-Egido, Fernando Sánchez-Juanes, José Manuel González-Buitrago, Juan Luis Muñoz-Bellido
MALDI-TOF mass spectrometry is now a routine resource in Clinical Microbiology, because of its speed and reliability in the identification of microorganisms. Its performance in the identification of bacteria and yeasts is perfectly contrasted. The identification of mycobacteria and moulds is more complex, due to the heterogeneity of spectra within each species. The methodology is somewhat more complex, and expanding the size of species libraries, and the number of spectra of each species, will be crucial to achieve greater efficiency...
January 17, 2017: Enfermedades Infecciosas y Microbiología Clínica
https://www.readbyqxmd.com/read/28107941/mil-101-cr-as-matrix-for-sensitive-detection-of-quercetin-by-matrix-assisted-laser-desorption-ionization-mass-spectrometry
#4
Guobin Han, Qiaoling Zeng, Zhongwei Jiang, Tiantian Xing, Chengzhi Huang, Yuanfang Li
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) has been proven as a useful and advanced technique in the identification of polymers and proteins. However, MALDI-TOF-MS still has the unavoidable drawback of self-signal interference with traditional organic matrices, which could suppress and overlap with the analyte signals in the low-mass region. In this work, MIL-101(Cr), a kind of metal-organic frameworks which possess high molecular weight, π-conjugated 3-D structure, coordinately unsaturated chromium sites (CUS) and strong absorption in the UV range, was employed to replace traditional organic matrices, and it was found that MIL-101(Cr) can dramatically eliminate the background peaks, showing high signal-to-noise level in the analysis of small molecules...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28101334/implementation-of-short-incubation-maldi-tof-ms-identification-from-positive-blood-cultures-in-routine-diagnostics-and-effects-on-empiric-antimicrobial-therapy
#5
Robin Köck, Jörg Wüllenweber, Dagmar Horn, Christian Lanckohr, Karsten Becker, Evgeny A Idelevich
BACKGROUND: Results of blood culture (BC) diagnostics should be swiftly available to guide treatment of critically ill patients. Conventional BC diagnostics usually performs species identification of microorganisms from mature solid medium colonies. Species identification might be speed up by using matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry (MS) of biomass from shortly incubated solid media. METHODS: This single-center analysis compared the applicability of MALDI-TOF-based species identification from shortly incubated cultures in laboratory routine vs...
2017: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/28101252/identification-of-proteins-from-wild-cardoon-flowers-cynara-cardunculus-l-by-a-proteomic-approach
#6
Amal Ben Amira, Julien Bauwens, Edwin De Pauw, Souhail Besbes, Hamadi Attia, Frédéric Francis, Christophe Blecker
Proteomic approach was applied to identify total proteins, particularly the enzymatic content, from wild cardoon flowers. As the selection of an appropriate sample preparation method is the key for getting reliable results, two different extraction/precipitation methods (trichloroacetic acid and phenol/ammonium acetate) were tested on fresh and lyophilized flowers. After two-dimensional electrophoresis (2D-E) separations, a better protein pattern was obtained after phenol extraction from lyophilized flowers...
January 2017: Journal of Chemical Biology
https://www.readbyqxmd.com/read/28100598/molecular-and-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-characterization-of-clinically-significant-melanized-fungi-in-india
#7
Ashutosh Singh, Pradeep Kumar Singh, Anil Kumar, Jagdish Chander, Geetika Khanna, Pradip Roy, Jacques F Meis, Anuradha Chowdhary
Melanized or black fungi are a heterogeneous group of fungi causing cutaneous to systemic diseases with high mortality. These fungi are rarely reported as agent of human infections primarily due to difficulties in their classical identification. In this study we examined using molecular methods and MALDI-TOF MS the diversity of melanized fungi (MF) isolated from patients in 19 medical centers in India. Overall, during a 4-year period, 718 (5.3%) clinical specimens yielded MF. Of these, 72 (10%) isolates had clinical significance and were identified primarily by sequencing the ITS and LSU regions...
January 18, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28100314/matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-for-rapid-identification-of-fungal-rhinosinusitis-pathogens
#8
Xinxin Lu, Yanfei Huang, Mingxin Zhang, Min Zhu, Mei Wang, Yufeng Sun, Haitong Gu, Jingjing Cao, Xue Li, Shaoya Zhang, Jinglin Wang
BACKGROUND: filamentous fungi are the most important pathogens causing fungal rhinosinusitis (FRS). Current laboratory diagnosis of FRS pathogens mainly relies on phenotypic identification by culture and microscopic examination, which is time-consuming and expertise-dependent. Although matrix -assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) has been employed to identify various fungi, its performance for the identification of FRS fungi is less clear...
January 17, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28100271/evaluation-of-three-sample-preparation-methods-for-the-direct-identification-of-bacteria-in-positive-blood-cultures-by-maldi-tof
#9
Hannah Tanner, Jason T Evans, Savita Gossain, Abid Hussain
BACKGROUND: Patient mortality is significantly reduced by rapid identification of bacteria from sterile sites. MALDI-TOF can identify bacteria directly from positive blood cultures and multiple sample preparation methods are available. We evaluated three sample preparation methods and two MALDI-TOF score cut-off values. Positive blood culture bottles with organisms present in Gram stains were prospectively analysed by MALDI-TOF. Three lysis reagents (Saponin, SDS, and SepsiTyper lysis bufer) were applied to each positive culture followed by centrifugation, washing and protein extraction steps...
January 18, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28099490/correction-rapid-classification-and-identification-of-microcystis-aeruginosa-strains-using-maldi-tof-ms-and-polygenetic-analysis
#10
(no author information available yet)
[This corrects the article DOI: 10.1371/journal.pone.0156275.].
2017: PloS One
https://www.readbyqxmd.com/read/28097087/identification-of-the-vascular-endothelial-growth-factor-signalling-pathway-by-quantitative-proteomic-analysis-of-rat-condylar-cartilage
#11
Liting Jiang, Yinyin Xie, Li Wei, Qi Zhou, Xing Shen, Xinquan Jiang, Yiming Gao
Angiogenesis mediated by vascular endothelial growth factor (VEGF) is known to play an important role in regulating cartilage remodelling and endochondral ossification. However, the details of how VEGF signalling mechanisms affect condyle remodelling in response to alterations in functional loading remains unclear. To explore this, eighty 16-day-old male SD rats were divided into two equal groups which were fed either a soft/powdery diet or a hard diet for 4 weeks; the stiffness of the diet results in alteration of mastication force and hence temporomandibular joint (TMJ) development...
January 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/28094091/can-maldi-tof-mass-spectrometry-reasonably-type-bacteria
#12
REVIEW
Marlène Sauget, Benoît Valot, Xavier Bertrand, Didier Hocquet
Bacterial typing is crucial to tackle the spread of bacterial pathogens but current methods are time-consuming and costly. Matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) has been recently integrated into the microbiology laboratory workflow for a quick and low-cost microbial species identification. Independent research groups have successfully redirected the original function of this technology from their primary purpose to discriminate subgroups within pathogen species...
January 13, 2017: Trends in Microbiology
https://www.readbyqxmd.com/read/28092721/use-of-maldi-tof-mass-spectrometry-in-the-battle-against-bacterial-infectious-diseases-recent-achievements-and-future-perspectives
#13
Vassilios Sandalakis, Ioannis Goniotakis, Iosif Vranakis, Dimosthenis Chochlakis, Anna Psaroulaki
Advancements in microbial identification occur increasingly faster as more laboratories explore, refine and extend the use of mass spectrometry in the field of microbiology. Areas covered: This review covers the latest knowledge found in the literature for quick identification of various classes of bacterial pathogens known to cause human infection by the use of MALDI-TOF MS technology. Except for identification of bacterial strains, more researchers try to "battle time" in favor of the patient. These novel approaches to identify bacteria directly from clinical samples and even determine antibiotic resistance are extensively revised and discussed...
January 16, 2017: Expert Review of Proteomics
https://www.readbyqxmd.com/read/28091797/mass-spectrometric-identification-of-phenol-soluble-modulins-in-the-atcc%C3%A2-43300-standard-strain-of-methicillin-resistant-staphylococcus-aureus-harboring-two-distinct-phenotypes
#14
K S Jang, M Park, J Y Lee, J S Kim
Staphylococcus aureus subsp. aureus Rosenbach (ATCC® 43300™) is a representative methicillin-resistant S. aureus (MRSA) strain that is used as a quality control strain for testing the methicillin susceptibility of clinical isolates. It has been consistently observed that colonies with two different colors (golden yellow and white) grow from the ATCC stock on blood agar plates. In this study, staphylococcal peptide and protein profiling was performed using matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry...
January 14, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28087424/clinical-applications-of-maldi-imaging-technologies-in-cancer-and-neurodegenerative-diseases
#15
REVIEW
Yasemin Ucal, Zeynep Aslıhan Durer, Hakan Atak, Elif Kadioglu, Betul Sahin, Abdurrahman Coskun, Ahmet Tarık Baykal, Aysel Ozpinar
Matrix-assisted laser desorption/ionization (MALDI) time-of-flight (TOF) imaging mass spectrometry (IMS) enables localization of analytes of interest along with histology. More specifically, MALDI-IMS identifies the distributions of proteins, peptides, small molecules, lipids, and drugs and their metabolites in tissues, with high spatial resolution. This unique capacity to directly analyze tissue samples without the need for lengthy sample preparation reduces technical variability and renders MALDI-IMS ideal for the identification of potential diagnostic and prognostic biomarkers and disease gradation...
January 10, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28073965/spread-of-mcr-1-carrying-enterobacteriaceae-in-sewage-water-from-spain
#16
C M Ovejero, J F Delgado-Blas, W Calero-Caceres, M Muniesa, B Gonzalez-Zorn
OBJECTIVES: The mobile colistin resistance gene mcr-1 has been identified worldwide in human and animal sources, while its occurrence in the environment is still largely unknown. The aim of this study was to investigate the presence of mcr-1-harbouring Enterobacteriaceae in water samples obtained from rivers and waste water treatment plants in the area of Barcelona, Spain. METHODS: The presence of mcr-1 was detected by PCR. Bacterial identification was performed via MALDI-TOF MS...
January 10, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28070313/decarboxylase-positive-enterococcus-faecium-strains-isolated-from-rabbit-meat-and-their-sensitivity-to-enterocins
#17
Andrea Lauková, Renata Szabóová, Pavel Pleva, Leona Buňková, Ľubica Chrastinová
BACKGROUND: The objective of the study was to determine sensitivity of Enterococcus faecium strains from rabbit meat to enterocins. RESULTS: Twenty-five decarboxylase-positive strains (from rabbit meat) allotted to the species E. faecium by genotypization and by MALDI TOF MS spectrometry identification (evaluation score value range 2.104-2.359; in the range for highly probable species identification-score value 2.300-3.000 and secure probable species identification/probable species identification-2...
January 2017: Food Science & Nutrition
https://www.readbyqxmd.com/read/28068884/evaluation-of-protein-spectra-cluster-analysis-for-streptococcus-spp-identification-from-various-swine-clinical-samples
#18
Carlos E C Matajira, Luisa Z Moreno, Vasco T M Gomes, Ana Paula S Silva, Renan E Mesquita, Daniela S Doto, Franco F Calderaro, Fernando N de Souza, Ana Paula G Christ, Maria Inês Z Sato, Andrea M Moreno
Traditional microbiological methods enable genus-level identification of Streptococcus spp. isolates. However, as the species of this genus show broad phenotypic variation, species-level identification or even differentiation within the genus is difficult. Herein we report the evaluation of protein spectra cluster analysis for the identification of Streptococcus species associated with disease in swine by means of matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). A total of 250 S...
January 1, 2017: Journal of Veterinary Diagnostic Investigation
https://www.readbyqxmd.com/read/28067053/global-profiling-of-metabolite-and-lipid-soluble-microbial-products-in-anaerobic-wastewater-reactor-supernatant-using-uplc-mse
#19
Phornpimon Tipthara, Chinagarn Kunacheva, Yan Ni Annie Soh, Stephen C C Wong, Ng Sean Pin, David C Stuckey, Bernhard O Boehm
Identification of soluble microbial products (SMPs) released during bacterial metabolism in mixed cultures in bioreactors is essential to understanding fundamental mechanisms of their biological production. SMPs constitute one of the main foulants (together with colloids and bacterial flocs) in membrane bioreactors widely used to treat, and ultimately recycle wastewater. More importantly, the composition and origin of potentially toxic, carcinogenic, or mutagenic SMPs in renewable/reused water supplies must be determined and controlled...
January 9, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28060824/chronological-profiling-of-plasma-native-peptides-after-hepatectomy-in-pigs-toward-the-discovery-of-human-biomarkers-for-liver-regeneration
#20
Kohta Iguchi, Etsuro Hatano, Takashi Nirasawa, Noriyuki Iwasaki, Motohiko Sato, Gen Yamamoto, Kenya Yamanaka, Tatsuya Okamoto, Yosuke Kasai, Naohiko Nakamura, Hiroaki Fuji, Tomohito Sakai, Nobuto Kakuda, Satoru Seo, Kojiro Taura, Kei Tashiro, Shinji Uemoto, Masaya Ikegawa
Liver regeneration after partial hepatectomy (PHx) is a time-dependent process, which is tightly regulated by multiple signaling cascades. Failure of this complex process leads to posthepatectomy liver failure (PHLF), which is associated with a high rate of mortality. Thus, it is extremely important to establish a useful biomarker of liver regeneration to help prevent PHLF. Here, we hypothesized that alterations in the plasma peptide profile may predict liver regeneration following PHx and hence we set up a diagnostic platform for monitoring posthepatectomy outcome...
2017: PloS One
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