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antibiotic residues

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https://www.readbyqxmd.com/read/29352089/cryptic-production-of-trans-3-hydroxyproline-in-echinocandin-b-biosynthesis
#1
Johanna Mattay, Stefanie Houwaart, Wolfgang Hüttel
Echinocandins are antifungal nonribosomal hexapeptides produced by fungi. Two of the amino acids are hydroxy-l-prolines: trans-4-hydroxy-l-proline and, in most echinocandin structures, (trans-2,3)-3-hydroxy-(trans-2,4)-4-methyl-l-proline. In the case of echinocandin biosynthesis by Glarea lozoyensis, both amino acids are found in pneumocandin A0, while in pneumocandin B0 the latter residue is substituted by trans-3- hydroxy-l-proline (3-Hyp). We have recently reported that all three amino acids are generated by the 2-oxoglutarate-dependent proline hydroxylase GloF...
January 19, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29348804/lysine-analogue-of-polymyxin-b-as-a-significant-opportunity-for-photodynamic-antimicrobial-chemotherapy
#2
Florent Le Guern, Tan-Sothea Ouk, Catherine Ouk, Regis Vanderesse, Yves Champavier, Emilie Pinault, Vincent Sol
In order to highlight the potential of photodynamic antimicrobial chemotherapy in case of infections by antibiotic resistant-strains, a new antimicrobial peptide conjugate has been synthesized, consisting of a derivative of polymyxin B and a cationic porphyrin covalently attached together to a spacer. A polymyxin-derived moiety was subjected to a primary structural modification in the replacement of four diaminobutyrate residues with lysine ones. This modification was done in order to strongly reduce bactericidal activity, with the aim to eliminate the potential rise of polymyxin-resistant strains...
January 11, 2018: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/29346035/determination-of-105-antibiotic-anti-inflammatory-antiparasitic-agents-and-tranquilizers-by-lc-ms-ms-based-on-an-acidic-quechers-like-extraction
#3
Aurélien Desmarchelier, Kaïli Fan, Mai Minh Tien, Marie-Claude Savoy, Adrienne Tarres, Denis Fuger, Alexandre Goyon, Thomas Bessaire, Pascal Mottier
A procedure for screening 105 veterinary drugs in foods by liquid chromatography tandem mass-spectrometry (LC-MS/MS) is presented. Its scope encompasses raw materials of animal origin (milk, meat, fish, egg and fat) but also related processed ingredients and finished products commonly used and manufactured by food business operators. Due to the complexity of the matrices considered and to efficiently deal with losses during extraction and matrix effects during MS source ionisation, each sample was analyzed twice, that is "unspiked" and "spiked at the screening target concentration" using a QuEChERS-like extraction...
January 18, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/29344432/wt1-peptide-vaccine-in-montanide-in-contrast-to-poly-iclc-is-able-to-induce-wt1-specific-immune-response-with-tcr-clonal-enrichment-in-myeloid-leukemia
#4
Hongtao Liu, Yuanyuan Zha, Noura Choudhury, Gregory Malnassy, Noreen Fulton, Margaret Green, Jae-Hyun Park, Yusuke Nakamura, Richard A Larson, Andres M Salazar, Olatoyosi Odenike, Thomas F Gajewski, Wendy Stock
Background: The optimal strategy for vaccination to induce CD8+ T cell responses against WT1 is not known. Methods: A pilot randomized study in HLA-A02+ patients to receive vaccination with WT1 in Montanide or in poly ICLC, a TLR3 agonist, to explore the novel immune adjuvant was conducted. Seven patients were randomized. Four patients received WT1 in Montanide, and three with WT1 in poly ICLC. Five patients were in morphologic remission and two had residual morphologic disease at the study entry...
2018: Experimental Hematology & Oncology
https://www.readbyqxmd.com/read/29336808/miniaturized-solid-phase-extraction-of-macrolide-antibiotics-in-honey-and-bovine-milk-using-mesoporous-mcm-41-silica-as-sorbent
#5
Li-Jing Du, Ling Yi, Li-Hong Ye, Yu-Bo Chen, Jun Cao, Li-Qing Peng, Yu-Ting Shi, Qiu-Yan Wang, Yu-Han Hu
A simple and effective method of miniaturized solid-phase extraction (mini-SPE) was developed for the simultaneous purification and enrichment of macrolide antibiotics (MACs) (i.e. azithromycin, clarithromycin, erythromycin, lincomycin and roxithromycin) from honey and skim milk. Mesoporous MCM-41 silica was synthesized and used as sorbent in mini-SPE. Several key parameters affecting the performance of mini-SPE procedure were thoroughly investigated, including sorbent materials, amount of sorbent and elution solvents...
January 3, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29333612/fosfomycin-residues-in-colostrum-impact-on-morpho-physiology-and-microbiology-of-suckling-piglets
#6
M B Fernández Paggi, G Martínez, S N Diéguez, D S Pérez Gaudio, J M Decundo, M B Riccio, F A Amanto, M O Tapia, A L Soraci
Fosfomycin is a broad-spectrum bactericidal antibiotic widely used in pig farms for the treatment of a wide variety of bacterial infections. In this study, the elimination of disodium fosfomycin in colostrum/milk of the sow and the impact of this antibiotic on the microbiota and intestinal morpho-physiology of suckling piglets were analyzed. The average amount of fosfomycin eliminated in colostrum (after administration of 15 mg/kg IM) during the first 10 hr postpartum was 0.85 μg/ml, and the mean residual amount ingested by the piglets was 0...
January 14, 2018: Journal of Veterinary Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/29324077/screening-of-23-%C3%AE-lactams-in-foodstuffs-by-lc-ms-ms-using-an-alkaline-quechers-like-extraction
#7
Thomas Bessaire, Claudia Mujahid, Andrea Beck, Adrienne Tarres, Marie-Claude Savoy, Pei-Mun Woo, Pascal Mottier, Aurélien Desmarchelier
A fast and robust high performance liquid chromatography tandem mass spectrometry (LC-MS/MS) screening method was developed for the analysis of β-lactam antibiotics in foods of animal origin: eggs, raw milk, processed dairy ingredients, infant formula, and meat- and fish-based products including baby-foods. QuEChERS extraction with some adaptations enabled twenty-three drugs to be simultaneously monitored. Screening Target Concentrations were set at levels adequate to ensure compliance with current European, Chinese, US and Canadian regulations...
January 11, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/29324075/screening-of-veterinary-drug-residues-in-food-by-lc-ms-ms-background-and-challenges
#8
Thierry Delatour, Lucie Racault, Thomas Bessaire, Aurélien Desmarchelier
Regulatory agencies and government authorities have established maximum residue limits (MRL) in various food matrices of animal origin for supporting governments and food operators in the monitoring of veterinary drug residues in the food chain, and ultimately in the consumer's plate. Today, about 200 veterinary drug residues from several families, mainly with antibiotic, antiparasitic or anti-inflammatory activities, are regulated in a variety of food matrices such as milk, meat or egg. The current article provides a review of the regulatory framework in milk and muscle including data from Codex Alimentarius, Europe, USA, Canada and China for about 220 veterinary drugs...
January 11, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/29323259/impacts-of-feeding-preweaned-calves-milk-containing-drug-residues-on-the-functional-profile-of-the-fecal-microbiota
#9
Richard Van Vleck Pereira, Laura M Carroll, Svetlana Lima, Carla Foditsch, Julie D Siler, Rodrigo Carvalho Bicalho, Lorin D Warnick
Feeding drug residue-containing milk to calves is common worldwide and no information is currently available on the impact on the functional profile of the fecal microbiota. Our objective was to characterize the functional profile of the fecal microbiota of preweaned dairy calves fed raw milk with residual concentrations of antimicrobials commonly found in waste milk from birth to weaning. Calves were assigned to a controlled feeding trial being fed milk with no drug residues or milk with antibiotic residues...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29321962/mutual-influence-of-secondary-and-key-drug-resistance-mutations-on-catalytic-properties-and-thermal-stability-of-tem-type-%C3%AE-lactamases
#10
Vitaly Grigorenko, Igor Uporov, Maya Rubtsova, Irina Andreeva, Dmitrii Shcherbinin, Alexander Veselovsky, Oksana Serova, Maria Ulyashova, Igor Ishtubaev, Alexey Egorov
Highly mutable β-lactamases are responsible for the ability of Gram-negative bacteria to resist β-lactam antibiotics. Using site-directed mutagenesis technique, we have produced in vitro a number of recombinant analogs of naturally occurring TEM-type β-lactamases, bearing the secondary substitution Q39K and key mutations related to the extended-spectrum (E104K, R164S) and inhibitor-resistant (M69V) β-lactamases. The mutation Q39K alone was found to be neutral and hardly affected the catalytic properties of β-lactamases...
January 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29315771/pityriasis-lichenoides-long-term-follow-up-study
#11
Julie B Zang, Sarah J Coates, Jing Huang, Eric C Vonderheid, Bernard A Cohen
BACKGROUND/OBJECTIVES: Pityriasis lichenoides is an uncommon papulosquamous disorder of unknown etiology. The objective of this study was to review the clinical features and treatment responses of individuals with pityriasis lichenoides seen at a tertiary referral center. METHODS: Seventy-five patients diagnosed with pityriasis lichenoides between 1997 and 2013 were reviewed, and 46 had long-term follow-up via telephone interviews. RESULTS: Fifty (67%) patients were diagnosed with pityriasis lichenoides chronica, 22 (29%) with pityriasis lichenoides et varioliformis acuta, and 3 (4%) with mixed pityriasis lichenoides chronica and pityriasis lichenoides et varioliformis acuta features...
January 9, 2018: Pediatric Dermatology
https://www.readbyqxmd.com/read/29310232/electrochemical-aptasensor-for-multi-antibiotics-detection-based-on-endonuclease-and-exonuclease-assisted-dual-recycling-amplification-strategy
#12
Shengfeng Huang, Ning Gan, Tianhua Li, You Zhou, Yuting Cao, Youren Dong
An ultrasensitive electrochemical aptasensor for multiplex antibiotics detection based on endonuclease and exonuclease assisted dual recycling amplification strategy was proposed. Kanamycin and chloramphenicol were selected as candidates. Firstly, aptamers of the antibiotics were immobilized on bar A and then binding with their endonuclease labeled complementary DNA strands to construct enzyme-cleavage probes. Secondly, The nano zirconium-metal organic framework (NMOF) particles with 1,4-benzene-dicarboxylate (BDC) as linker was defined as UiO-66...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29304128/identification-of-a-protective-b-cell-epitope-of-the-staphylococcus-aureus-gapc-protein-by-screening-a-phage-displayed-random-peptide-library
#13
Mengyao Wang, Lu Zhai, Wei Yu, Yuhua Wei, Lizi Wang, Shuo Liu, Wanyu Li, Xiaoting Li, Simiao Yu, Xiaoting Chen, Hua Zhang, Jing Chen, Zhenyue Feng, Liquan Yu, Yudong Cui
The impact of epidemic Staphylococcus aureus (S. aureus) on public health is increasing. Because of the abuse of antibiotics, the antibiotic resistance of S. aureus is increasing. Thus, there is an urgent need to develop new immunotherapies and immunoprophylaxes. Previous studies showed that the GapC protein of S. aureus, which is a surface protein with high glyceraldehyde 3-phosphate dehydrogenase activity, transferrin binding activity, and other biological activities, is highly conserved. GapC induces an effective humoral immune response in vivo...
2018: PloS One
https://www.readbyqxmd.com/read/29303545/investigation-of-amide-bond-formation-during-dehydrophos-biosynthesis
#14
Emily C Ulrich, Despina J Bougioukou, Wilfred A van der Donk
Dehydrophos is a tripeptide phosphonate antibiotic produced by Streptomyces luridus. Its biosynthetic pathway involves the use of aminoacyl-tRNA (aa-tRNA) for amide bond formation. The first amide bond during biosynthesis is formed by DhpH-C, a peptidyltransferase that utilizes Leu-tRNALeu. DhpH-C is a member of a burgeoning family of natural product biosynthetic enzymes that make use of aa-tRNA outside of canonical translation activities in the cell. Here we used site-directed mutagenesis of both DhpH-C and tRNALeu to investigate the enzyme mechanism and substrate specificity, respectively, and analyzed the substrate scope for the production of a series of dipeptides...
January 5, 2018: ACS Chemical Biology
https://www.readbyqxmd.com/read/29302134/safety-and-effectiveness-of-percutaneous-needle-fasciotomy-for-dupuytren-s-disease-in-the-palm
#15
Muhammad Mansha, Darren Flynn, John Stothard
Purpose  Percutaneous needle fasciotomy is performed in the authors' department to treat Dupuytren's contracture at metacarpophalangeal joints. This study aimed to establish its safety and efficacy, compared with standard fasciectomy. Materials and Methods  All patients who had this procedure performed over the study period were sent the validated British Society for Surgery of the Hand (BSSH) postal questionnaire assessing surgical outcome. Hand function and disability were assessed using the Patient Evaluation Measure (PEM)...
December 2017: Journal of Hand and Microsurgery
https://www.readbyqxmd.com/read/29301982/search-of-multiple-hot-spots-on-the-surface-of-peptidyl-trna-hydrolase-structural-binding-and-antibacterial-studies
#16
Sanket Kaushik, Naseer Iqbal, Nagendra Singh, Juhi Sikarwar, Prashant K Singh, Pradeep Sharma, Punit Kaur, Sujata Sharma, Mohammad Owais, Tej P Singh
Peptidyl-tRNA hydrolase (Pth) catalyzes the breakdown of peptidyl-tRNA into peptide and tRNA components. Pth from Acinetobacter baumannii ( Ab Pth) was cloned, expressed, purified and crystallized in native unbound ( Ab Pth-N) state and in bound state with phosphate ion and cytosine arabinoside (cytarabine) ( Ab Pth-C). Structures of Ab Pth-N and Ab Pth-C were determined at 1.36Å and 1.10Å resolutions respectively.  Structure of Ab Pth-N showed that the active site is filled with water molecules. In the structure of Ab Pth-C, a phosphate ion is present in the active site while cytarabine is bound in a cleft which is located away from the catalytic site...
January 4, 2018: Biochemical Journal
https://www.readbyqxmd.com/read/29300841/determination-of-dicyclohexylamine-in-beeswax-by-aqueous-normal-phase-liquid-chromatography-coupled-with-tandem-mass-spectrometry
#17
Thomas S Thompson, Johan P van den Heever, Stephen F Pernal
Dicyclohexylamine (DCH) is an excipient present in commercial formulations of fumagillin (Fumagilin-B® and Fumidil-B®), an antibiotic which is employed in apiculture for the control of nosema disease. DCH has been demonstrated to be stable in harvested honey; however, its fate in the beehive has not been investigated. In this study, DCH residues were determined in beeswax samples collected from brood chambers and honey supers from various apiaries throughout Alberta. The determination of DCH was performed using a simple extraction procedure followed by low-temperature cleanup and finally analysis with aqueous normal phase liquid chromatography-electrospray ionization tandem mass spectrometry...
December 29, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29300254/postoperative-catheter-management-after-pelvic-reconstructive-surgery-a-survey-of-practice-strategies
#18
Sarah S Boyd, Elena Tunitsky-Bitton, David M OʼSullivan, Adam C Steinberg
OBJECTIVE: The aim of this study was to evaluate practice preferences in catheter management after a failed inpatient voiding trial after pelvic reconstructive surgery. METHODS: This is a cross-sectional study of postoperative catheter management after pelvic reconstructive surgery after failed voiding trial. Physicians practicing at ACGME-accredited residencies and fellowships in Obstetrics and Gynecology (Ob/Gyn), Urology, and Female Pelvic Medicine and Reconstructive Surgery (FPMRS) within the United States completed a Web-based questionnaire in March 2017...
January 3, 2018: Female Pelvic Medicine & Reconstructive Surgery
https://www.readbyqxmd.com/read/29299582/facile-synthesis-of-carbon-quantum-dots-loaded-with-mesoporous-g-c3n4-for-synergistic-absorption-and-visible-light-photodegradation-of-fluoroquinolone-antibiotics
#19
Yingfei Wang, Fengliang Wang, Yiping Feng, Zhijie Xie, Qianxin Zhang, Xiaoyu Jin, Haijin Liu, Yang Liu, Wenying Lv, Guoguang Liu
The development of facile and efficient synthetic approaches of carbon quantum dots loaded with mesoporous g-C3N4 (mpg-C3N4/CQDs) is of critical urgency. Here, a facile strategy was developed to synthesize the mpg-C3N4/CQDs by using calcinations of the mixture of CQDs, cyanamide, and silica colloid. The obtained composite still retained a considerable total surface area, which could offer a larger population of adsorption sites; therefore enhance the capacity for the adsorption of fluoroquinolones antibiotics (FQs)...
January 4, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29298792/lemierre-s-syndrome-a-pain-in-the-neck-with-far-reaching-consequences
#20
Thomas James Stubington, Paul James
Lemierre's syndrome is a potentially life-threatening consequence of oropharyngeal and ear infections and often results in critical care admission and even intubation. Due to the multisystem manifestation, multiple teams may initially be involved in the care, some of which may be unfamiliar with the features and usual clinical course. This report describes a case in a 36-year-old woman with the classic features of internal jugular vein thrombosis and septic emboli to the lungs secondary to an oropharyngeal infection...
January 3, 2018: BMJ Case Reports
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