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https://www.readbyqxmd.com/read/28636756/chemical-composition-and-allelopathic-antibacterial-antifungal-and-antiacetylcholinesterase-activity-of-fish-mint-houttuynia-cordata-thunb-from-india
#1
Ram S Verma, Neeta Joshi, Rajendra C Padalia, Ved R Singh, Prakash Goswami, Ajay Kumar, Hina Iqbal, Rajesh K Verma, Debabrata Chanda, Amit Chauhan, Dharmendra Saikia
Fish-mint (Houttuynia cordata Thunb.), belongs to family Saururaceae has long been used as food and traditional herbal medicine. The present study was framed to assess the changes occurring in the essential-oil composition of Houttuynia cordata during annual growth and to evaluate allelopathic, antibacterial, antifungal and antiacetylcholinesterase activities. The essential-oil content ranged from 0.06-0.14% and 0.08-0.16% in aerial-parts and underground-stem, respectively. The essential oils were analysed by GC-FID, GC-MS and NMR ((1) H & (13) C)...
June 21, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28635997/a-spin-column-free-approach-to-sodium-hydroxide-based-glycan-permethylation
#2
Yueming Hu, Chad R Borges
Glycan permethylation was introduced as a tool to facilitate the study of glycans in 1903. Since that time, permethylation procedures have been continually modified to improve permethylation efficiency and qualitative applicability. Typically, however, either laborious preparation steps or cumbersome and uneconomical spin columns have been needed to obtain decent permethylation yields on small glycan samples. Here we describe a spin column-free (SCF) glycan permethylation procedure that is applicable to both O- and N-linked glycans and can be employed upstream to intact glycan analysis by MALDI-MS, ESI-MS, or glycan linkage analysis by GC-MS...
June 21, 2017: Analyst
https://www.readbyqxmd.com/read/28635619/on-the-importance-of-accurate-quantification-of-individual-volatile-metabolites-in-exhaled-breath
#3
David Smith, Patrik Spanel
It is argued that shortcomings of certain approaches to breath analysis research based on superficial interpretation of non-quantitative data are inadvertently inhibiting the progression of non-invasive breath analysis into clinical practice. The objective of this perspective is to suggest more clinically profitable approaches to breath research. Thus, following a discourse on the challenges and expectations in breath research, a brief indication is given of the analytical techniques currently used for the analysis of very humid exhaled breath...
June 21, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28635610/chemical-components-antioxidant-potential-and-hepatoprotective-effects-of-artemisia-campestris-essential-oil-against-deltamethrin-induced-genotoxicity-and-oxidative-damage-in-rats
#4
Mongi Saoudi, Marwa Ncir, Manel Ben Ali, Malek Grati, Kamel Jamoussi, Noureddine Allouche, Abdelfattah El Feki
In the present study, we evaluated the antioxidant potential of Artemisia campestris essential oil (ACEO) and the possible protective effects against deltamethrin induced hepatic toxic effects. The ACEO showed radical scavenging activity with IC50 = 47.66 ± 2.51 µg/ml, ferric reducing antioxidant power (FRAP) potential (EC50 = 5.36 ± 0.77 µg/ml), superoxide scavenging activity (IC50 = 0.175 ± 0.007 µg/ml) and ˙OH scavenging activity (IC50 = 0.034 ± 0.007 µg/ml). The obtained results of phenolic profile demonstrated that phenolic compounds are the major contributor to the antioxidant activity of ACEO...
July 2017: General Physiology and Biophysics
https://www.readbyqxmd.com/read/28634228/spatial-mapping-and-profiling-of-metabolite-distributions-during-germination
#5
Adam D Feenstra, Liza E Alexander, Zhihong Song, Andrew R Korte, Marna Yandeau-Nelson, Basil J Nikolau, Young-Jin Lee
Germination is a highly complex process by which seeds begin to develop and establish themselves as viable organisms. In this paper, we utilize a combination of GC-MS, LC-fluorescence, and mass spectrometry imaging (MSI) approaches to profile and visualize the metabolic distributions of germinating seeds from two different inbreds of maize seeds, B73 and Mo17. GC and LC analyses demonstrate that the two inbreds are highly differentiated in their metabolite profiles throughout the course of germination, especially with regard to amino acids, sugar alcohols, and small organic acids...
June 20, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28633145/urinary-volatile-organic-compounds-as-potential-biomarkers-in-idiopathic-membranous-nephropathy
#6
Mingao Wang, Rujuan Xie, Xibei Jia, Ruichan Liu
OBJECTIVE: To detect urinary volatile organic compounds (VOCs) in patients with idiopathic membranous nephropathy (iMN) and normal controls, and whether or not the urinary VOCs can act as biomarkers for diagnosis of iMN independent of renal biopsy. MATERIALS AND METHODS: Gas chromatography/mass spectrometry (GC/MS) was used to assess the urine collected from 63 iMN patients and 15 normal controls. The statistical methods of principal component analysis (PCA) and partial least squares discriminant analysis (PLSDA) were performed to process the final data in CDF format which were converted from GC/MS data...
June 19, 2017: Medical Principles and Practice: International Journal of the Kuwait University, Health Science Centre
https://www.readbyqxmd.com/read/28633071/structural-characterization-of-the-immunostimulatory-exopolysaccharide-produced-by-leuconostoc-mesenteroides-strain-ntm048
#7
Chiaki Matsuzaki, Chikahiro Takagaki, Yusuke Tomabechi, Lennart S Forsberg, Christian Heiss, Parastoo Azadi, Kenji Matsumoto, Toshihiko Katoh, Koji Hosomi, Jun Kunisawa, Kenji Yamamoto, Keiko Hisa
The exopolysaccharide (EPS) produced by probiotic Leuconostoc mesenteroides subsp. mesenteroides strain NTM048 has been reported to be an immunostimulant that enhances mucosal IgA production. In this study, we found that intranasal administration of mice with the EPS and an antigen (ovalbumin) resulted in secretion of antigen-specific IgA and IgG in the airway mucosa and the serum, suggesting that the EPS has the adjuvant activity for use with mucosal vaccination. Methylation analysis coupled to GC-MS, and 1D and 2D NMR spectroscopy revealed that 94% of the EPS consists of an α-(1 → 6) glucan containing 4% of 1→3-linked α-glucose branches...
June 15, 2017: Carbohydrate Research
https://www.readbyqxmd.com/read/28631877/identification-of-chemical-components-in-baidianling-capsule-based-on-gc-ms-and-hplc-combined-with-fourier-transform-ion-cyclotron-resonance-mass-spectrometry
#8
Wenying Wu, Yu Chen, Binjie Wang, Xiaoyang Sun, Ping Guo, Xiaohui Chen
Baidianling Capsule, which is made from 16 Chinese herbs, has been widely used for treating vitiligo clinically. In this study, the sensitive and rapid method has been developed for the analysis of chemical components in Baidianling Capsule by gas chromatography with mass spectrometry in combination with retention indices and high-performance liquid chromatography combined with Fourier transform-ion cyclotron resonance mass spectrometry. Firstly, a total of 110 potential volatile compounds obtained from different extraction procedures including alkanes, alkenes, alkyne, ketones, ethers, aldehydes, alcohols, phenols, organic acids, esters, furan, pyrrole, acid amide, heterocycle and oxide were detected from Baidianling Capsule by gas chromatography with mass spectrometry, of which 75 were identified by mass spectrometry in combination with the retention index...
June 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28629236/advances-in-new-psychoactive-substances-identification-the-u-r-i-to-n-consortium
#9
Elisabetta Bertol, Fabio Vaiano, Francesco Mari, Maria Grazia Di Milia, Silvia Bua, Claudiu T Supuran, Fabrizio Carta
Identification of new psychoactive substances (NPS) in biological and non-biological samples represents a hard challenge for forensic toxicologists. Their great chemical variety and the speed with which new NPS are synthesised and spread make stringent the need of advanced tools for their detection based on multidisciplinary approaches. For this reason, in August 2016, the "Unit of Research and Innovation in Forensic Toxicology and Neuroscience of Addiction" (U.R.I.To.N.) was founded by the Forensic Toxicology Division of the University of Florence...
December 2017: Journal of Enzyme Inhibition and Medicinal Chemistry
https://www.readbyqxmd.com/read/28629123/sensory-characteristics-and-volatile-components-of-dry-dog-foods-manufactured-with-sorghum-fractions
#10
Brizio Di Donfrancesco, Kadri Koppel
Descriptive sensory analysis and gas chromatography-mass spectrometry (GC-MS) with a modified headspace solid-phase microextraction (SPME) method was performed on three extruded dry dog food diets manufactured with different fractions of red sorghum and a control diet containing corn, brewer's rice, and wheat as a grain source in order to determine the effect of sorghum fractions on dry dog food sensory properties. The aroma compounds and flavor profiles of samples were similar with small differences, such as higher toasted aroma notes, and musty and dusty flavor in the mill-feed sample...
June 17, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28629120/metabolomics-characterization-of-two-apocynaceae-plants-catharanthus-roseus-and-vinca-minor-using-gc-ms-and-lc-ms-methods-in-combination
#11
Qi Chen, Xueyan Lu, Xiaorui Guo, Qingxi Guo, Dewen Li
Catharanthus roseus (C. roseus) and Vinca minor (V. minor) are two common important medical plants belonging to the family Apocynaceae. In this study, we used non-targeted GC-MS and targeted LC-MS metabolomics to dissect the metabolic profile of two plants with comparable phenotypic and metabolic differences. A total of 58 significantly different metabolites were present in different quantities according to PCA and PLS-DA score plots of the GC-MS analysis. The 58 identified compounds comprised 16 sugars, eight amino acids, nine alcohols and 18 organic acids...
June 17, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28629048/fabrication-and-investigation-of-a-biocompatible-microfilament-with-high-mechanical-performance-based-on-regenerated-bacterial-cellulose-and-bacterial-cellulose
#12
Huan-Ling Wu, David H Bremner, Hai-Jun Wang, Jun-Zi Wu, He-Yu Li, Jian-Rong Wu, Shi-Wei Niu, Li-Min Zhu
A high-strength regenerated bacterial cellulose (RBC)/bacterial cellulose (BC) microfilament of potential use as a biomaterial was successfully prepared via a wet spinning process. The BC not only consists of a 3-D network composed of nanofibers with a diameter of several hundred nanometers but also has a secondary structure consisting of highly oriented nanofibrils with a diameter ranging from a few nanometers to tens of nanometers which explains the reason for the high mechanical strength of BC. Furthermore, a strategy of partially dissolving BC was used and this greatly enhanced the mechanical performance of spun filament and a method called post-treatment was utilized to remove residual solvents from the RBC/BC filaments...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628882/effective-biotransformation-and-detoxification-of-anthraquinone-dye-reactive-blue-4-by-using-aerobic-bacterial-granules
#13
Ashvini U Chaudhari, Dhiraj Paul, Dhiraj Dhotre, Kisan M Kodam
Treatment of textile wastewater containing anthraquinone dye is quite a huge challenge due to its complex aromatic structure and toxicity. Present study deals with the degradation and detoxification of anthraquinone dye reactive blue 4 using aerobic bacterial granules. Bacterial granules effectively decolorized reactive blue 4 at wide range of pH (4.0-11.0) and temperature (20-55 °C) as well as decolorized and tolerated high concentration of reactive blue 4 dye upto 1000 mg l(-1) with Vmax 6.16 ± 0...
June 3, 2017: Water Research
https://www.readbyqxmd.com/read/28626996/vortex-ultrasound-assisted-dispersive-liquid-liquid-microextraction-coupled-with-gc-ms-for-the-analysis-of-volatile-bioactive-components-and-comparative-pharmacokinetic-study-of-the-herb-herb-interactions-in-guanxin-shutong-capsule
#14
Jingqing Mu, Xun Gao, Qing Li, Xiaomei Yang, Wenling Yang, Xu Sun, Kaishun Bi, Huifen Zhang
Guanxin Shutong Capsule, an effective traditional Chinese medicine, is widely used for coronary heart disease clinically. Volatile components are one of its important bioactive constituents. To better understand the material basis for the therapeutic effects, the components of Guanxin Shutong Capsule absorbed into the blood and their metabolites were identified based on gas chromatography with mass spectrometry coupled with vortex-ultrasound-assisted dispersive liquid-liquid microextraction. As a result, three prototypes and 15 metabolites were identified or tentatively characterized in rat plasma...
June 19, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28626990/exhaled-breath-profiles-in-the-monitoring-of-loss-of-control-and-clinical-recovery-in-asthma
#15
Paul Brinkman, Marianne A van de Pol, Marije G Gerritsen, Lieuwe D Bos, Tamara Dekker, Barbara S Smids, Anirban Sinha, Christof J Majoor, Marlous M Sneeboer, Hugo H Knobel, Teunis J Vink, Frans H de Jongh, René Lutter, Peter J Sterk, Niki Fens
BACKGROUND: Asthma is a chronic inflammatory airway disease, associated with episodes of exacerbations. Therapy with inhaled corticosteroids (ICS) targets airway inflammation, which aims to maintain and restore asthma control. Clinical features are only modestly associated with airways inflammation. Therefore, we hypothesized that exhaled volatile metabolites identify longitudinal changes between clinically stable episodes and loss of asthma control. OBJECTIVES: To determine whether exhaled volatile organic compounds (VOCs) as measured by gas-chromatography / mass-spectrometry (GC/MS) and electronic nose (eNose) technology discriminate between clinically stable and unstable episodes of asthma...
June 19, 2017: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28624318/differential-urinary-metabolites-related-with-the-severity-of-major-depressive-disorder
#16
Jian-Jun Chen, Chan-Juan Zhou, Peng Zheng, Ke Cheng, Hai-Yang Wang, Juan Li, Li Zeng, Peng Xie
Major depressive disorder (MDD) is a common mental disorder that affects a person's general health. However, there is still no objective laboratory test for diagnosing MDD. Here, an integrated analysis of data from our previous studies was performed to identify the differential metabolites in the urine of moderate and severe MDD patients. A dual platform approach (NMR spectroscopy and GC-MS) was used. Consequently, 14 and 22 differential metabolites responsible for separating moderate and severe MDD patients, respectively, from their respective healthy controls (HCs) were identified...
June 14, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28623787/simultaneous-determination-of-btex-and-their-metabolites-using-solid-phase-microextraction-followed-by-hplc-or-gc-ms-an-application-in-teeth-as-environmental-biomarkers
#17
Johannes L González, Albert Pell, Montserrat López-Mesas, Manuel Valiente
Applications of benzene, toluene, ethylbenzene, and o-, m-, and p-xylenes (BTEX) release them into the environment exposing living organism. These endocrine disruptors are toxic, highly volatile and easily absorbed by the lungs and can cause adverse consequences for the human health as neurological diseases and cancer. A method for the analysis of BTEX and its metabolites (phenols and aromatic acids) in teeth is presented. The method consists in a one-step simple extraction procedure from spiked tooth using NaOH solution followed by SPME-HPLC or HS-SPME-GC/MS determination...
June 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28623565/the-novel-oleaginous-bacterium-sphingomonas-sp-egy1-dsm-29616-a-value-added-platform-for-renewable-biodiesel
#18
Nehad N Amer, Yasser Elbahloul, Amira M Embaby, Ahmed Hussein
Oleaginous microorganisms are regarded as efficient, renewable cell factories for lipid biosynthesis, a biodiesel precursor, to overwhelm the cosmopolitan energy crisis with affordable investment capital costs. Present research highlights production and characterization of lipids by a newly isolated oleaginous bacterium, Sphingomonas sp. EGY1 DSM 29616 through an eco-friendly approach. Only sweet whey [42.1% (v/v)] in tap water was efficiently used as a growth medium and lipid production medium to encourage cell growth and trigger lipid accumulation simultaneously...
July 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28622970/congener-specific-determination-of-ultratrace-levels-of-chlorinated-and-brominated-polycyclic-aromatic-hydrocarbons-in-atmosphere-and-industrial-stack-gas-by-isotopic-dilution-gas-chromatography-high-resolution-mass-spectrometry-method
#19
Rong Jin, Guorui Liu, Minghui Zheng, Heidelore Fiedler, Xiaoxu Jiang, Lili Yang, Xiaolin Wu, Yang Xu
Isotopic dilution gas chromatography combined with high resolution mass spectrometry (GC/HRMS) has overwhelming advantages with respect to the accuracy of congener-specific ultratrace analysis of complex persistent organic pollutants (POPs) in environmental matrices. However, an isotopic dilution GC/HRMS method for analysis of chlorinated and brominated polycyclic aromatic hydrocarbons (Cl-PAHs and Br-PAHs) using (13)C-labelled congeners as internal standards has not been established. In this study, a method for identification and quantification of 38 congeners of Cl-PAHs and Br-PAHs in atmosphere and stack gas samples from waste incinerators was developed using the isotopic dilution GC/HRMS technique...
June 10, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28622801/rapid-determination-of-nitrate-in-vegetables-by-gas-chromatography-mass-spectrometry
#20
Beatrice Campanella, Massimo Onor, Enea Pagliano
In this study we present a novel isotope dilution gas chromatography method for the determination of nitrate in vegetables. The analyte was extracted in water at 70(∘)C and mixed with (15)N isotopically enriched nitrate internal standard. The sample was centrifuged and the supernatant reacted with sulfamic acid for removal of nitrite, and with triethyloxonium tetrafluoroborate for converting nitrate into volatile EtONO2. This simple aqueous chemistry allowed for separation of analyte from sample matrix in the form of a gaseous derivative which could be sampled in the headspace before GC-MS analysis...
August 8, 2017: Analytica Chimica Acta
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