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MALDI and matrix

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https://www.readbyqxmd.com/read/29776363/rapid-detection-of-carbapenemase-activity-of-enterobacteriaceae-isolated-from-positive-blood-cultures-by-maldi-tof-ms
#1
Jiajia Yu, Jingxian Liu, Yuanrui Li, Jing Yu, Weinan Zhu, Ying Liu, Lisong Shen
BACKGROUND: Matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) has been proved to be a useful tool for identification of pathogens directly isolated from blood cultures in clinical microbiology laboratories. β-Lactam antibiotics are commonly used for treatment of bloodstream infections caused by Enterobacteriaceae strains, and carbapenem is the superlative class of β-lactam antibiotics. Since the carbapenem resistance rate of Enterobacteriaceae strains raised year by year, efficient detection of carbapenemase activity and timely delivery of carbapenem susceptibility reports of Enterobacteriaceae strains isolated from blood cultures is important for clinicians...
May 18, 2018: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/29775706/purification-and-characterization-of-an-organic-solvent-tolerant-and-detergent-stable-lipase-from-haloferax-mediterranei-cncmm-50101
#2
Siham Akmoussi-Toumi, Souad Khemili-Talbi, Imen Ferioune, Salima Kebbouche-Gana
The present study investigates the purification and biochemical characterization of an extracellular lipase (HML) from Haloarchaea Haloferax mediterranei strain ATS1, isolated from the Sebkha (Medea, Algeria). The pure protein was obtained with ammonium sulfate precipitation (40-70%)-dialysis and UNO Q-6 FPLC, and characterized biochemically. Matrix assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF/MS) analysis revealed that the purified enzyme was a monomer, with a molecular mass of 45,011...
May 15, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29774958/effect-of-trapping-method-on-species-identification-of-phlebotomine-sandflies-by-maldi-tof-ms-protein-profiling
#3
P Halada, K Hlavackova, J Risueño, E Berriatua, P Volf, V Dvorak
Sandflies (Diptera: Psychodidae) (Newstead, 1911) are blood-feeding insects that transmit human pathogens including Leishmania (Trypanosomatida: Trypanosomatidae) parasites, causative agents of the leishmaniases. To elucidate Leishmania transmission cycles, conclusive identification of vector species is essential. Molecular approaches including matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) protein profiling have recently emerged to complement morphological identification...
May 18, 2018: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/29773805/new-insights-into-mechanisms-of-material-ejection-in-maldi-mass-spectrometry-for-a-wide-range-of-spot-sizes
#4
Marcel Niehaus, Jens Soltwisch
Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is widely used for the analysis of large biomolecules in numerous applications. The technique utilizes nanosecond-long laser pulses at various spot sizes to eject and ionize large molecules embedded in a highly absorptive chemical matrix. Despite the methods name, 'molecular desorption' from the matrix crystal surface is not the sole mechanism discussed for material ejection in MALDI, but additional ablation of larger clusters has been reported...
May 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29764754/detection-of-methicillin-resistant-coagulase-negative-staphylococci-harboring-the-class-a-mec-complex-by-maldi-tof-mass-spectrometry
#5
Dominik Schuster, Michaele Josten, Kathrin Janssen, Isabel Bodenstein, Cathrin Albert, Anna Schallenberg, Mike Gajdiss, Esther Sib, Christiane Szekat, Katja Kehl, Marijo Parčina, Gunnar T R Hischebeth, Gabriele Bierbaum
The aim of this study was to test the identification of methicillin resistance in coagulase-negative staphylococci by routine matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF MS). SCCmec cassettes of type II, III and VIII encode a small peptide called PSM-mec in the vicinity of mecA. It is visible at m/z 2415 during MALDI-TOF MS of whole cells of Staphylococcus aureus. In view of the fact that psm-mec has been identified in methicillin-resistant coagulase-negative staphylococci, we evaluated a collection of clinical coagulase-negative staphylococci, that contained 77...
May 8, 2018: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/29762695/development-and-validation-of-an-extended-database-for-yeast-identification-by-maldi-tof-ms-in-argentina
#6
Constanza Giselle Taverna, Mariana Mazza, Nadia Soledad Bueno, Christian Alvarez, Susana Amigot, Mariana Andreani, Natalia Azula, Rubén Barrios, Norma Fernández, Barbara Fox, Liliana Guelfand, Ivana Maldonado, Omar Alejandro Murisengo, Silvia Relloso, Matias Vivot, Graciela Davel
Matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS) has revolutionized the identification of microorganisms in clinical laboratories because it is rapid, relatively simple to use, accurate, and can be used for a wide number of microorganisms. Several studies have demonstrated the utility of this technique in the identification of yeasts; however, its performance is usually improved by the extension of the database. Here we developed an in-house database of 143 strains belonging to 42 yeast species in the MALDI Biotyper platform, and we validated the extended database with 388 regional strains and 15 reference strains belonging to 55 yeast species...
May 11, 2018: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
https://www.readbyqxmd.com/read/29761443/mass-spectrometry-imaging-msi-for-plant-metabolomics
#7
Berin A Boughton, Dinaiz Thinagaran
Mass spectrometry imaging (MSI) is a developing technique to measure the spatiotemporal distribution of many biomolecules in tissues. Over the preceding decade MSI has been adopted by plant biologists and applied in a broad range of areas including: primary metabolism, natural products, plant defense, plant responses to abiotic and biotic stress, plant lipids, and the developing field of spatial metabolomics. This methods chapter covers preparation of plant tissues for matrix-assisted laser desorption ionization (MALDI)-MSI, including sample embedding and freezing, sectioning, mounting, and matrix deposition using both sublimation and spray deposition prior to MSI analysis...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29759594/liquid-chromatography-mass-spectrometry-based-metabolomics-and-lipidomics-reveal-toxicological-mechanisms-of-bisphenol-f-in-breast-cancer-xenografts
#8
Chao Zhao, Peisi Xie, Hailin Wang, Zongwei Cai
Bisphenol F (BPF) is a major alternative to bisphenol (BPA) and has been widely used. Although BPA exposure is known to generate various toxic effects, toxicity of BPF remains under-explored. A comprehensive method involving mass spectrometry (MS)-based global lipidomics and metabolomics, and matrix-assisted laser desorption/ionization-mass spectrometry (MALDI)- MS imaging (MSI) was used to study toxic effects of BPF and the underlying mechanisms on tumor metastasis-related tissues (liver and kidney) in breast cancer xenografts...
May 5, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29759225/ceo-2-cb-nanocomposite-as-a-novel-saldi-substrate-for-enhancing-the-detection-sensitivity-of-pharmaceutical-drug-molecules-in-beverage-samples
#9
Entesar Al-Hetlani, Mohamed O Amin, Metwally Madkour, Ahmed Abdel Nazeer
SALDI-MS analysis of pharmaceutical drug molecules (amitriptyline, imipramine and promazine) using carbon-based substrates, namely, activated charcoal (AC), carbon nanotubes (CNTs), carbon black (CB), graphene (rGO), graphene oxide (GO) and graphite, was explored and compared with the conventional organic matrix of MALDI. CB exhibited superior performance with respect to the other substrates in terms of detection sensitivity. Despite the effectiveness of CB to detect all drug molecules, it demonstrated a number of background signals, which may be an issue for the analysis of other molecules in the future...
August 1, 2018: Talanta
https://www.readbyqxmd.com/read/29758474/purification-and-characterization-of-two-pathogenesis-related-class-10-protein-isoforms-with-ribonuclease-activity-from-the-fresh-angelica-sinensis-roots
#10
Jianru Pan, Xiangling Wang, Lingling Li, Xian Li, Xiaoqiang Ye, Di Lv, Cuihuang Chen, Shutao Liu, Huocong He
In this study, two pathogenesis-related (PR) class 10 protein isoforms, ASPR-1 and ASPR-2, were purified from fresh roots of the Chinese medicinal plant Angelica sinensis (A. sinensis) using 80% ammonium sulfate precipitation, Sephadex G50 gel filtration chromatography, and DEAE-Sepharose ion-exchange chromatography. The molecular masses of ASPR-1 and ASPR-2 were estimated to be 16.66 kDa and 16.46 kDa, respectively, using sodium dodecylsulfate-polyacrylamide gel electrophoresis (SDS-PAGE). The isoforms are both glycoproteins containing glycosyl contents of 1...
April 30, 2018: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29758349/habitual-aerobic-exercise-gene-apoa5-named-rs662799-snp-and-response-of-blood-lipid-and-lipoprotein-phenotypes-among-older-chinese-adult
#11
Xiangyun Liu, Guoyuan Huang, Zhanbin Niu, Yuqin Wei, Ru Wang
BACKGROUND: The genetic component of dyslipidemia has been studied in adults but little in older population. It is remains unknown regarding influence and interaction of APOA5 gene single nucleotide polymorphism (SNP) and habitual aerobic exercise (HAE) on changes of blood lipids and lipoprotein phenotypes in older Chinese adults. METHODS: Four-hundred-twenty-three old Chinese individuals with HAE were divided into hyperlipidemia and normal groups. We genotyped polymorphic loci using matrix assisted laser desorption ionization time of flight mass spectrometry detection technology (MALDI-TOF)...
May 11, 2018: Experimental Gerontology
https://www.readbyqxmd.com/read/29757129/qingshengfania-soli-zhang-et-al-2015-is-a-later-heterotypic-synonym-of-pseudochelatococcus-lubricantis-k%C3%A3-mpfer-et-al-2015
#12
Peter Kämpfer, Stefanie P Glaeser, Marco Gräber, Andreas Rabenstein, Jan Kuever
Qingshengfania soli DSM 103870T was compared with Pseudochelatococcus lubricantis MPA 1113T to clarify the taxonomic relationship of both species because of their high phylogenetic relationship. 16S rRNA gene sequence comparisons demonstrated that these species share 100  % sequence similarity. Investigation of fatty acid patterns, substrate utilization, and matrix-assisted laser desorption/ionization-time-of-flight (MALDI-TOF) profiles displayed no striking differences between the type strains of both species...
May 14, 2018: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/29756170/further-characteristics-of-arcanobacterium-pinnipediorum-dsm-28752-t-and-arcanobacterium-wilhelmae-dsm-102162-t-two-novel-species-of-genus-arcanobacterium
#13
Osama Sammra, Jörg Rau, Jörn Wickhorst, Mazen Alssahen, Abdulwahed Ahmed Hassan, Christoph Lämmler, Ellen Prenger-Berninghoff, Amir Abdulmawjood
The newly described type strains Arcanobacterium pinnipediorum DSM 28752T and Arcanobacterium wilhelmae DSM 102162T , initially isolated from an anal swab of a harbor seal (Sammra et al. Int J Syst Evol Microbiol 65:4539-4543, 2015) and the genital tract of a rhinoceros (Sammra et al. Int J Syst Evol Microbiol 67:2093-2097, 2017), could be further characterized by matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) and Fourier transform infrared (FT-IR) spectroscopy and by sequencing the genomic targets 16S-23S rDNA intergenic spacer region (ISR) and the genes rpoB, gap, and tuf...
May 13, 2018: Folia Microbiologica
https://www.readbyqxmd.com/read/29755575/waist-hip-ratio-related-genetic-loci-are-associated-with-risk-of-impaired-fasting-glucose-in-chinese-children-a-case-control-study
#14
Qi-Ying Song, Xiang-Rui Meng, Anke Hinney, Jie-Yun Song, Tao Huang, Jun Ma, Hai-Jun Wang
Background: The meta-analyses of genome-wide association studies identified several waist-hip ratio (WHR) related loci in individuals of European ancestry. Since the pattern of fat distribution and the relationship between fat distribution and glucose metabolism disturbance in Chinese are different from those in Europeans, the present study aimed to explore the individual and cumulative effects of WHR-related loci on glycemic phenotypes in Chinese children. Methods: A total of 2030 children were recruited from two independent studies...
2018: Nutrition & Metabolism
https://www.readbyqxmd.com/read/29752875/characterisation-of-antagonistic-yeasts-for-biocontrol-applications-on-apples-or-in-soil-by-quantitative-analyses-of-synthetic-yeast-communities
#15
Simon Gross, Liesa Kunz, Denise C Müller, Amanda Santos Kron, Florian M Freimoser
Antagonistic yeasts suppress plant pathogenic fungi by various mechanisms, but their biocontrol efficacy also depends on the ability to compete and persist in the environment. The goal of the work presented here was to quantify the composition of synthetic yeast communities in order to determine the competitiveness of different species and identify promising candidates for plant protection. For this purpose, colony counting of distinct species and matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS; MALDI biotyping) were used to distinguish different yeast species and to quantify the composition of a synthetic community of six yeasts (Aureobasidium pullulans, Candida subhashii, Cyberlindnera sargentensis, Hanseniaspora sp...
May 12, 2018: Yeast
https://www.readbyqxmd.com/read/29752761/spatial-analysis-of-lipid-metabolites-and-expressed-genes-reveals-tissue-specific-heterogeneity-of-lipid-metabolism-in-high-and-low-oil-brassica-napus-l-seeds
#16
Shaoping Lu, Drew Sturtevant, Mina Aziz, Cheng Jin, Qing Li, Kent D Chapman, Liang Guo
Despite the importance of oilseeds to worldwide human nutrition, and more recently to the production of bio-based diesel fuels, the detailed mechanisms regulating seed oil biosynthesis remain partly understood, especially from a tissue-specific perspective. Here, we investigated the spatial distributions of lipid metabolites and transcripts involved in oil biosynthesis from seeds of two low-erucic acid genotypes of Brassica napus with high and low seed oil content. Integrated results from matrix-assisted laser desorption/ionization-mass spectrometry imaging (MALDI-MSI) of lipids in situ, lipidome profiling of extracts from seed tissues, and tissue-specific transcriptome analysis revealed complex spatial distribution patterns of lipids and transcripts...
May 11, 2018: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/29752627/maldi-tof-ms-supplementary-database-for-species-identification-employing-the-yeast-diversity-encountered-on-southern-brazil-grapes
#17
Bruna Carla Agustini, Gildo Almeida da Silva, Tania Maria Bordin Bonfim
The study of grape microflora is of interest when autochthonous yeasts, which are related to typical wine characteristics, are intended to be used in winemaking. The election of matrix-assisted laser desorption-ionization time-of-flight mass spectrometry (MALDI-TOF MS) as the first method for yeast identification was based on its accuracy and rapidity compared to alternative laboratory protocols for identification. The aims of this study are to consolidate the MALDI-TOF MS Supplementary database for environmental yeasts already constructed, to expand it through the addition of standard spectra of not included yeast species, and to discuss the grape microflora encountered in Southern Brazil...
May 11, 2018: Folia Microbiologica
https://www.readbyqxmd.com/read/29750765/ideal-and-actual-impact-of-rapid-diagnostic-testing-and-antibiotic-stewardship-on-antibiotic-prescribing-and-clinical-outcomes-in-children-with-positive-blood-cultures
#18
Caroline H Reuter, Hannah L Palac, Larry K Kociolek, Xiaotian T Zheng, Yusuf Y Chao, Rupal Patel, Sameer J Patel
BACKGROUND: Implementing matrix assisted laser desorption ionization time of flight (MALDI-TOF) and multiplex PCR (mPCR) has been associated with decreased mortality and hospital length of stay in adults, but the impact in pediatrics is less understood. METHODS: This pre-post quasi-experimental study compared antibiotic prescribing for positive blood cultures in patients ≤21 years collected in 2012 (pre-intervention) and in 2015 (after MALDI-TOF/mPCR). Time to effective and optimal antimicrobial therapy were evaluated using Cox proportional hazards regression...
May 10, 2018: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/29749232/towards-spectral-library-free-maldi-tof-ms-bacterial-identification
#19
Ding Cheng, Liang Qiao, Péter Horvatovich
Bacterial identification is of great importance in clinical diagnosis, environmental monitoring and food safety control. Among various strategies, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) has drawn significant interests, and has been clinically used. Nevertheless, current bioinformatics solutions use spectral libraries for the identification of bacterial strains. Spectral library generation requires acquisition of MALDI-TOF spectra from monoculture bacterial colonies, which is time-consuming and not possible for many species and strains...
May 11, 2018: Journal of Proteome Research
https://www.readbyqxmd.com/read/29748547/region-of-interest-analysis-using-mass-spectrometry-imaging-of-mitochondrial-and-sarcomeric-proteins-in-acute-cardiac-infarction-tissue
#20
Yuka Yajima, Takuya Hiratsuka, Yu Kakimoto, Shuichiro Ogawa, Keisuke Shima, Yuzo Yamazaki, Kenichi Yoshikawa, Keiji Tamaki, Tatsuaki Tsuruyama
Matrix-assisted laser desorption ionization image mass spectrometry (MALDI-IMS) has been developed for the identification of peptides in various tissues. The MALDI-IMS signal distribution patterns and quantification of the signal intensities of the regions of interest (ROI) with healthy regions were compared for identification of the disease specific biomarkers. We performed a new ROI analysis using the conventional t-test and data number independent Cohen's d-value analysis. Using these techniques, we analysed heart tissues after acute myocardial infarction (AMI)...
May 10, 2018: Scientific Reports
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