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Frontiers in Chemistry

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https://www.readbyqxmd.com/read/28894734/rugged-large-volume-injection-for-sensitive-capillary-lc-ms-environmental-monitoring
#1
Hanne Roberg-Larsen, Silvija Abele, Deniz Demir, Diana Dzabijeva, Sunniva F Amundsen, Steven R Wilson, Vadims Bartkevics, Elsa Lundanes
A rugged and high throughput capillary column (cLC) LC-MS switching platform using large volume injection and on-line automatic filtration and filter back-flush (AFFL) solid phase extraction (SPE) for analysis of environmental water samples with minimal sample preparation is presented. Although narrow columns and on-line sample preparation are used in the platform, high ruggedness is achieved e.g., injection of 100 non-filtrated water samples did not result in a pressure rise/clogging of the SPE/capillary columns (inner diameter 300 μm)...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28861411/reduction-and-alkylation-of-proteins-in-2d-gel-electrophoresis-before-or-after-isoelectric-focusing
#2
Xiaolin Wu, Chenhui Xu, Wei Wang
No abstract text is available yet for this article.
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28824906/gc-ms-analysis-and-gastroprotective-evaluations-of-crude-extracts-isolated-saponins-and-essential-oil-from-polygonum-hydropiper-l
#3
Muhammad Ayaz, Muhammad Junaid, Farhat Ullah, Abdul Sadiq, Muhammad Shahid, Waqar Ahmad, Ihsan Ullah, Ashfaq Ahmad, Nawazish-I-Husain Syed
Peptic ulceration is among the most prevalent gastrointestinal disorders characterized by pepsin and gastric acid mediated mucosal damage, as result of imbalance between defensive and offensive processes. The main objective of the current study was to investigate the antiulcer potentials of Polygonum hydropiper crude methanolic ectract (Ph.Cr) in aspirin induced ulcerogenesis using pylorus ligated rat model. In-vitro urease and Proteus mirabilis inhibitory potentials were evaluated using standard protocols...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28824905/quantification-of-the-changes-in-potent-wine-odorants-as-induced-by-bunch-rot-botrytis-cinerea-and-powdery-mildew-erysiphe-necator
#4
Angela Lopez Pinar, Doris Rauhut, Ernst Ruehl, Andrea Buettner
Fungal infections are detrimental for viticulture since they may reduce harvest yield and wine quality. This study aimed to characterize the effects of bunch rot and powdery mildew on wine aroma by quantification of representative aroma compounds using Stable Isotope Dilution Analysis (SIDA). For this purpose, samples affected to a high degree by each fungus were compared with a healthy sample in each case; to this aim, the respective samples were collected and processed applying identical conditions. Thereby, the effects of bunch rot were studied in three different grape varieties: White Riesling, Red Riesling and Gewürztraminer whereas the influence of powdery mildew was studied on the hybrid Gm 8622-3...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28824904/vine-water-deficit-impacts-aging-bouquet-in-fine-red-bordeaux-wine
#5
Magali Picard, Cornelis van Leeuwen, François Guyon, Laetitia Gaillard, Gilles de Revel, Stéphanie Marchand
The aim of this study was to investigate the influence of vine water status on bouquet typicality, revealed after aging, and the perception of three aromatic notes (mint, truffle, and undergrowth) in bottled fine red Bordeaux wines. To address the issue of the role of vine water deficit in the overall quality of fine aged wines, a large set of wines from four Bordeaux appellations were subjected to sensory analysis. As vine water status can be characterized by carbon isotope discrimination (δ(13)C), this ratio was quantified for each wine studied...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28798910/changes-in-acylglycerols-composition-quality-characteristics-and-in-vivo-effects-of-dietary-pumpkin-seed-oil-upon-thermal-oxidation
#6
Alam Zeb, Sultan Ahmad
This study was aimed to determine the acylglycerols composition, quality characteristics, and protective role of dietary pumpkin seed oil (PSO) in rabbits. PSO was thermally oxidized and analyzed for quality characteristics and acylglycerols composition using reversed phase high performance liquid chromatography with diode array detection (HPLC-DAD). Oxidized and un-oxidized oil samples were fed to the rabbits in different doses for 2 weeks. The changes in the serum biochemistry, hematology, and liver histology were studied...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28798909/analysis-of-urine-composition-in-type-ii-diabetic-mice-after-intervention-therapy-using-holothurian-polypeptides
#7
Yanyan Li, Jiajie Xu, Xiurong Su
Hydrolysates and peptide fractions (PF) obtained from sea cucumber with commercial enzyme were studied on the hyperglycemic and renal protective effects on db/db rats using urine metabolomics. Compared with the control group the polypeptides from the two species could significantly reduce the urine glucose and urea. We also tried to address the compositions of highly expressed urinary proteins using a proteomics approach. They were serum albumins, AMBP proteins, negative trypsin, elastase, and urinary protein, GAPDH, a receptor of urokinase-type plasminogen activator (uPAR), and Ig kappa chain C region...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28791285/a-qstr-based-expert-system-to-predict-sweetness-of-molecules
#8
Cristian Rojas, Roberto Todeschini, Davide Ballabio, Andrea Mauri, Viviana Consonni, Piercosimo Tripaldi, Francesca Grisoni
This work describes a novel approach based on advanced molecular similarity to predict the sweetness of chemicals. The proposed Quantitative Structure-Taste Relationship (QSTR) model is an expert system developed keeping in mind the five principles defined by the Organization for Economic Co-operation and Development (OECD) for the validation of (Q)SARs. The 649 sweet and non-sweet molecules were described by both conformation-independent extended-connectivity fingerprints (ECFPs) and molecular descriptors...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28752088/electron-transfer-between-electrically-conductive-minerals-and-quinones
#9
Olga Taran
Long-distance electron transfer in marine environments couples physically separated redox half-reactions, impacting biogeochemical cycles of iron, sulfur and carbon. Bacterial bio-electrochemical systems that facilitate electron transfer via conductive filaments or across man-made electrodes are well-known, but the impact of abiotic currents across naturally occurring conductive and semiconductive minerals is poorly understood. In this paper I use cyclic voltammetry to explore electron transfer between electrodes made of common iron minerals (magnetite, hematite, pyrite, pyrrhotite, mackinawite, and greigite), and hydroquinones-a class of organic molecules found in carbon-rich sediments...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28748181/great-challenges-in-organic-chemistry
#10
EDITORIAL
Iwao Ojima
No abstract text is available yet for this article.
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28748180/buwchitin-a-ruminal-peptide-with-antimicrobial-potential-against-enterococcus-faecalis
#11
Linda B Oyama, Jean-Adrien Crochet, Joan E Edwards, Susan E Girdwood, Alan R Cookson, Narcis Fernandez-Fuentes, Kai Hilpert, Peter N Golyshin, Olga V Golyshina, Florence Privé, Matthias Hess, Hilario C Mantovani, Christopher J Creevey, Sharon A Huws
Antimicrobial peptides (AMPs) are gaining popularity as alternatives for treatment of bacterial infections and recent advances in omics technologies provide new platforms for AMP discovery. We sought to determine the antibacterial activity of a novel antimicrobial peptide, buwchitin, against Enterococcus faecalis. Buwchitin was identified from a rumen bacterial metagenome library, cloned, expressed and purified. The antimicrobial activity of the recombinant peptide was assessed using a broth microdilution susceptibility assay to determine the peptide's killing kinetics against selected bacterial strains...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28748179/structure-activity-relationships-of-insect-defensins
#12
REVIEW
Johannes Koehbach
Insects make up the largest and most diverse group of organisms on earth with several million species to exist in total. Considering the sheer number of insect species and the vast variety of ways they interact with their environment through chemistry, it is clear that they have significant potential as a source of new lead molecules. They have adapted to a range of ecological habitats and exhibit a symbiotic lifestyle with various microbes such as bacteria and fungi. Accordingly, numerous antimicrobial compounds have been identified including for example defensin peptides...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28736728/the-influence-of-apical-and-basal-defoliation-on-the-canopy-structure-and-biochemical-composition-of-vitis-vinifera-cv-shiraz-grapes-and-wine
#13
Pangzhen Zhang, Xiwen Wu, Sonja Needs, Di Liu, Sigfredo Fuentes, Kate Howell
Defoliation is a commonly used viticultural technique to balance the ratio between grapevine vegetation and fruit. Defoliation is conducted around the fruit zone to reduce the leaf photosynthetic area, and to increase sunlight exposure of grape bunches. Apical leaf removal is not commonly practiced, and therefore its influence on canopy structure and resultant wine aroma is not well-studied. This study quantified the influences of apical and basal defoliation on canopy structure parameters using canopy cover photography and computer vision algorithms...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28730150/from-electrochemical-biosensors-to-biomimetic-sensors-based-on-molecularly-imprinted-polymers-in-environmental-determination-of-heavy-metals
#14
REVIEW
Cosimino Malitesta, Sabrina Di Masi, Elisabetta Mazzotta
Recent work relevant to heavy metal determination by inhibition-enzyme electrochemical biosensors and by selected biomimetic sensors based on molecularly imprinted polymers has been reviewed. General features and peculiar aspects have been evidenced. The replace of biological component by artificial receptors promises higher selectivity and stability, while biosensors keep their capability of producing an integrated response directly related to biological toxicity of the samples.
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28725644/pesticides-curbing-soil-fertility-effect-of-complexation-of-free-metal-ions
#15
Sukhmanpreet Kaur, Vijay Kumar, Mohit Chawla, Luigi Cavallo, Albert Poater, Niraj Upadhyay
Researchers have suggested that the reason behind infertility is pernicious effect of broad spectrum pesticides on non target, beneficial microorganism of soil. Here, studying the chelating effect of selective organophosphate and carbamate pesticides with essential metal ions, at all possible combinations of three different pH (4 ± 0.05, 7 ± 0.05 and 9 ± 0.05) and three different temperatures (15 ± 0.5°C, 30 ± 0.5°C and 45 ± 0.5°C), shows very fast rate of reaction which further increases with increase of pH and temperature...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28713809/a-perspective-on-reagent-diversity-and-non-covalent-binding-of-reactive-carbonyl-species-rcs-and-effector-reagents-in-non-enzymatic-glycation-neg-mechanistic-considerations-and-implications-for-future-research
#16
Kenneth J Rodnick, R W Holman, Pamela S Ropski, Mingdong Huang, Arthur L M Swislocki
This perspective focuses on illustrating the underappreciated connections between reactive carbonyl species (RCS), initial binding in the nonenzymatic glycation (NEG) process, and nonenzymatic covalent protein modification (here termed NECPM). While glucose is the central species involved in NEG, recent studies indicate that the initially-bound glucose species in the NEG of human hemoglobin (HbA) and human serum albumin (HSA) are non-RCS ring-closed isomers. The ring-opened glucose, an RCS structure that reacts in the NEG process, is most likely generated from previously-bound ring-closed isomers undergoing concerted acid/base reactions while bound to protein...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28680877/metabolic-products-of-linalool-and-modulation-of-gabaa-receptors
#17
Sinem Milanos, Shaimaa A Elsharif, Dieter Janzen, Andrea Buettner, Carmen Villmann
Terpenoids are major subcomponents in aroma substances which harbor sedative physiological potential. We have demonstrated that various monoterpenoids such as the acyclic linalool enhance GABAergic currents in an allosteric manner in vitro upon overexpression of inhibitory α1β2 GABAA receptors in various expression systems. However, in plants or humans, i.e., following intake via inhalation or ingestion, linalool undergoes metabolic modifications including oxygenation and acetylation, which may affect the modulatory efficacy of the generated linalool derivatives...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28680876/anti-cancer-activity-of-maize-bioactive-peptides
#18
REVIEW
Jorge L Díaz-Gómez, Fabiola Castorena-Torres, Ricardo E Preciado-Ortiz, Silverio García-Lara
Cancer is one of the main chronic degenerative diseases worldwide. In recent years, consumption of whole-grain cereals and their derivative food products has been associated with a reduced risk of various types of cancer. The main biomolecules in cereals include proteins, peptides, and amino acids, all of which are present in different quantities within the grain. Some of these peptides possess nutraceutical properties and exert biological effects that promote health and prevent cancer. In this review, we report the current status and advances in knowledge regarding the bioactive properties of maize peptides, such as antioxidant, antihypertensive, hepatoprotective, and anti-tumor activities...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28674690/racing-on-the-wrong-track
#19
Laszlo Otvos
The preclinical in vitro and in vivo benchmark figures of cationic antimicrobial peptides have to be revisited based on the newly discovered alternative modes of action.
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28674689/allosteric-control-of-substrate-specificity-of-the-escherichia-coli-adp-glucose-pyrophosphorylase
#20
Ana C Ebrecht, Ligin Solamen, Benjamin L Hill, Alberto A Iglesias, Kenneth W Olsen, Miguel A Ballicora
The substrate specificity of enzymes is crucial to control the fate of metabolites to different pathways. However, there is growing evidence that many enzymes can catalyze alternative reactions. This promiscuous behavior has important implications in protein evolution and the acquisition of new functions. The question is how the undesirable outcomes of in vivo promiscuity can be prevented. ADP-glucose pyrophosphorylase from Escherichia coli is an example of an enzyme that needs to select the correct substrate from a broad spectrum of alternatives...
2017: Frontiers in Chemistry
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