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https://www.readbyqxmd.com/read/28213322/study-of-processes-influencing-bioavailability-of-pesticides-in-wood-soil-systems-effect-of-different-factors
#1
J M Marín-Benito, E Herrero-Hernández, M S Rodríguez-Cruz, M Arienzo, M J Sánchez-Martín
Lignocellulosic wastes and by-products containing lignin are now available in large amounts from forestry and industrial activities, and could be promising organic materials for the biosorption of pesticides by soils in order to reduce point-source pollution. Adding these materials to soil requires understanding the process of pesticide sorption-desorption by wood-soils, as sorption capacity could increase, with changes in pesticide bioavailability and final fate. The objective of this work was to study the effect that pine and oak wood added to soils had on the sorption/desorption of the pesticides linuron, alachlor, and metalaxyl...
February 14, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28213296/purification-of-quercetin-3-o-sophoroside-and-isoquercitrin-from-poacynum-hendersonii-leaves-using-macroporous-resins-followed-by-sephadex-lh-20-column-chromatography
#2
Hongjuan Li, Ying Liu, Yuetao Yi, Qin Miao, Sujing Liu, Feng Zhao, Wei Cong, Chunhua Wang, Chuanhai Xia
In China, Poacynum hendersonii is frequently used as a substitute for Apoacynum venetum L (Luobuma), which is a famous traditional Chinese medicine. Quercetin-3-O-sophoroside and isoquercitrin are two major flavonoids in Poacynum hendersonii leaves. In this work, a suitable method was established for the large-scale preparation of quercetin-3-O-sophoroside (QOS) and isoquercitrin (ISO) from Poacynum hendersonii leaves using macroporous resin combined with Sephadex LH-20 column chromatography. The adsorption/desorption capacities and desorption ratios of six macroporous resins were evaluated using static experiments...
February 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28213265/magnetic-mixed-hemimicelles-dispersive-solid-phase-extraction-based-on-ionic-liquid-coated-attapulgite-polyaniline-polypyrrole-fe3o4-nanocomposites-for-determination-of-acaricides-in-fruit-juice-prior-to-high-performance-liquid-chromatography-diode-array-detection
#3
Xiaoling Yang, Kexin Qiao, Fang Liu, Xiaoling Wu, Miyi Yang, Jing Li, Haixiang Gao, Sanbing Zhang, Wenfeng Zhou, Runhua Lu
In this research, a novel method using magnetic mixed hemimicelles dispersive solid-phase extraction (MMHDSPE) based on C16mimBr-coated attapulgite/polyaniline-polypyrrole/Fe3O4 (ATP/PANI-PPY/Fe3O4) nanocomposites were investigated for enrichment and separation of three acaricides in fruit juice. In this method, we combined the simplicity and speed of dispersive solid-phase extraction, the advantages of mixed hemimicelles and the facility of the phase separation of the magnetic nanoparticles to develop a simple, rapid, sensitive, and effective method for detecting target analytes from the juice samples...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213245/one-pot-synthesis-of-gold-carbon-dots-nanocomposite-and-its-application-for-cytosensing-of-metals-for-cancer-cells
#4
Hani Nasser Abdelhamid, Abuo Talib, Hui-Fen Wu
Cytosensing of biological transition metals is paramount important for cancer research. One-pot synthesis of the nanocomposite of carbon dots (CDs) and gold nanoparticles (AuNPs) is reported and has been applied for metal cytosensing. The nanocomposite (GCDs) is synthesized using citric acid (CA) and L-cysteine as precursors in the presence of chloroauric acid. The synthesis procedure exhibits many advantages including simple one step, green approach (solvent free method) and requires cheap chemical precursors...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213238/preparation-and-evaluation-of-magnetic-core-shell-mesoporous-molecularly-imprinted-polymers-for-selective-adsorption-of-tetrabromobisphenol-s
#5
Xuemei Wang, Pengfei Huang, Xiaomin Ma, Huan Wang, Xiaoquan Lu, Xinzhen Du
Novel magnetic mesoporous molecularly imprinted polymers (MMIPs) with core-shell structure were prepared by simple surface molecular imprinting polymerization using tetrabromobisphenol-S (TBBPS) as the template. The MMIPs-TBBPS were characterized by fourier-transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption transmission, and vibrating sample magnetometry. The resultant MMIPs-TBBPS were successfully applied magnetic solid-phase extraction (MSPE) coupled with HPLC determination of TBBPS in spiked real water samples with recoveries of 77...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213232/analysis-of-flavors-and-fragrances-by-hplc-with-fe3o4-go-magnetic-nanocomposite-as-the-adsorbent
#6
Rui Xiao, Xiaoting Zhang, Xiaona Zhang, Jiahua Niu, Minghua Lu, Xiuhua Liu, Zongwei Cai
In this article, a method for the analysis of flavors and fragrances including ethyl vanillin, trans-cinnamic acid, methyl cinnamate, ethyl cinnamate, and benzyl cinnamate in foods by HPLC with Fe3O4@GO nanocomposite as the adsorbent of magnetic solid-phase extraction was developed. The magnetic Fe3O4@GO nanocomposite was prepared and characterized by transmission electron microscope, infrared spectroscopy, X-ray diffraction and vibrating sample magnetometer. The as-prepared Fe3O4@GO nanocomposite was used as adsorbent for extraction and preconcentration of flavors and fragrances in foods...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213215/silica-boronate-affinity-material-for-quick-enrichment-of-intracellular-nucleosides
#7
Shuxia Wang, Huihui Li, Xiujuan Guan, Ting Cheng, Haixia Zhang
Boronic acid modified materials have been widely used to adsorb nucleosides, but their adsorption capacities require further improvement. Most cis-diol containing biomolecules are in very low abundance along with interfering components in real samples, and need to be enriched specially. In this study, we synthesize a kind of silica absorbent modified with boronic acid derivative, using amorphous silica as raw material and obtaining high adsorption capacity for adenosine. In addition, the adsorption equilibrium can be completed within 10s and 1min for the desorption...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28212296/purification-of-houttuynia-cordata-thunb-essential-oil-using-macroporous-resin-followed-by-microemulsion-encapsulation-to-improve-its-safety-and-antiviral-activity
#8
Jianmei Pang, Wujun Dong, Yuhuan Li, Xuejun Xia, Zhihua Liu, Huazhen Hao, Lingmin Jiang, Yuling Liu
Essential oil extracted from Houttuynia cordata Thunb. (H. cordata) is widely used in traditional Chinese medicine due to its excellent biological activities. However, impurities and deficient preparations of the essential oil limit its safety and effectiveness. Herein, we proposed a strategy to prepare H. cordata essential oil (HEO) safely and effectively by combining the solvent extraction and the macroporous resin purification flexibly, and then encapsulating it using microemulsion. The extraction and purification process were optimized by orthogonal experimental design and adsorption-desorption tests, respectively...
February 15, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28212036/development-of-ion-conductive-and-vapoluminescent-porous-coordination-polymers-composed-of-ruthenium-ii-metalloligand
#9
Ayako Watanabe, Atsushi Kobayashi, Erika Saitoh, Yuki Nagao, Shun Omagari, Takayuki Nakanishi, Yasuchika Hasegawa, W M C Sameera, Masaki Yoshida, Masako Kato
We synthesized two new porous coordination polymers (PCPs) {Ln7(OH)5[Ru(dcbpy)3]4·4nH2O} (Ln7-Ru4; Ln = Ce, Nd) composed of the luminescent ruthenium(II) metalloligand [Ru(4,4'-dcbpy)3](4-) ([4Ru]; 4,4'-dcbpy = 4,4'-dicarboxy-2,2'-bipyridine) and lanthanide ions Ln(3+) (Ln = Ce, Nd). These two PCPs Ln7-Ru4 are isomorphous with the previously reported PCP La7-Ru4, and the lattice constants (a, c, and unit cell volume V) changed systematically according to the lanthanide contraction. All three Ln7-Ru4 compounds have OH(-) anion containing porous structures and a large number of hydrate water molecules within the pores, resulting in moderate ion conductivities (10(-6)-10(-7) S cm(-1)) at 90% relative humidity (RH) and 298 K...
February 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28211480/visualisation-of-abscisic-acid-and-12-oxo-phytodienoic-acid-in-immature-phaseolus-vulgaris-l-seeds-using-desorption-electrospray-ionisation-imaging-mass-spectrometry
#10
Hirofumi Enomoto, Takuya Sensu, Kei Sato, Futoshi Sato, Thanai Paxton, Emi Yumoto, Koji Miyamoto, Masashi Asahina, Takao Yokota, Hisakazu Yamane
The plant hormone abscisic acid (ABA) and the jasmonic acid related-compound 12-oxo-phytodienoic acid (OPDA) play crucial roles in seed development, dormancy, and germination. However, a lack of suitable techniques for visualising plant hormones has restricted the investigation of their biological mechanisms. In the present study, desorption electrospray ionisation-imaging mass spectrometry (DESI-IMS), a powerful tool for visualising metabolites in biological tissues, was used to visualise ABA and OPDA in immature Phaseolus vulgaris L...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211065/the-synthesis-of-weak-acidic-type-hybrid-monolith-via-thiol-ene-click-chemistry-and-its-application-in-hydrophilic-interaction-chromatography
#11
Jiao Zeng, Shengquan Liu, Menglin Wang, Shouzhuo Yao, Yingzhuang Chen
In this work, a porous structure and good permeability monolithic column was polymerized in UV transparent fused-silica capillaries via photo-initiated thiol-ene click polymerization of 2, 4, 6, 8-tetravinyl-2, 4, 6, 8- tetramethylcyclotetrasiloxane (TMTVS), pentaerythritol tetra(3-mercaptopropionate) (PETMP), itaconic acid, respectively, in the presence of porogenic solvents (tetrahydrofuran and methanol) and a initiator (2, 2-dimethoxy-2-phenylacetophenone) (DMPA) within 30 min. The physical properties of this monolith were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and nitrogen adsorption/desorption measurements...
February 17, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28208315/tracer-counterpermeation-analysis-of-diffusivity-in-finite-length-nanopores-with-and-without-single-file-dynamics
#12
David M Ackerman, James W Evans
We perform a tracer counterpermeation (TCP) analysis for a stochastic model of diffusive transport through a narrow linear pore where passing of species within the pore is inhibited or even excluded (single-file diffusion). TCP involves differently labeled but otherwise identical particles from two decoupled infinite reservoirs adsorbing into opposite ends of the pore, and desorbing from either end. In addition to transient behavior, we assess steady-state concentration profiles, spatial correlations, particle number fluctuations, and diffusion fluxes through the pore...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208268/medical-swab-analysis-using-desorption-electrospray-ionization-mass-spectrometry-a-noninvasive-approach-for-mucosal-diagnostics
#13
Pamela Pruski, David A MacIntyre, Holly V Lewis, Paolo Inglese, Gonçalo D S Correia, Trevor T Hansel, Phillip R Bennett, Elaine Holmes, Zoltan Takats
Medical swabs are routinely used worldwide to sample human mucosa for microbiological screening with culture methods. These are usually time-consuming and have a narrow focus on screening for particular microorganism species. As an alternative, direct mass spectrometric profiling of the mucosal metabolome provides a broader window into the mucosal ecosystem. We present for the first time a minimal effort/minimal-disruption technique for augmenting the information obtained from clinical swab analysis with mucosal metabolome profiling using desorption electrospray ionization mass spectrometry (DESI-MS) analysis...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28207866/a-novel-mechanism-of-metal-gel-shift-by-histidine-rich-ni2-binding-hpn-protein-from-helicobacter-pylori-strain-ss1
#14
Rahul Mahadev Shelake, Yuki Ito, Junya Masumoto, Eugene Hayato Morita, Hidenori Hayashi
Sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) is a universally used method for determining approximate molecular weight (MW) in protein research. Migration of protein that does not correlate with formula MW, termed "gel shifting" appears to be common for histidine-rich proteins but not yet studied in detail. We investigated "gel shifting" in Ni2+-binding histidine-rich Hpn protein cloned from Helicobacter pylori strain SS1. Our data demonstrate two important factors determining "gel shifting" of Hpn, polyacrylamide-gel concentration and metal binding...
2017: PloS One
https://www.readbyqxmd.com/read/28207263/desorption-of-oxygen-from-cationic-niobium-oxide-clusters-revealed-by-gas-phase-thermal-desorption-spectrometry-and-dft-calculations
#15
Daigo Masuzaki, Toshiaki Nagata, Fumitaka Mafune
Thermal dissociation of cationic niobium oxide clusters (NbnOm+) was investigated by gas phase thermal desorption spectrometry. The dominant species formed at 300 K were NbnO2.5n+p (n = 2, 4, 6, …; p = 0, 1, 2, …) and NbnO2.5n-0.5+q (n = 3, 5,…; q = 0, 1, 2, …). At higher temperatures, the more oxygen-rich clusters were observed to release O2. However, the desorption of O2 from NbnOm+ was found to be insignificant in comparison with VnOm+ because Nb tends to have a +5 oxidation state exclusively, whereas V can have both +4 and +5 oxidation states...
February 16, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28206764/host-guest-chemistry-at-integrated-porous-space-formed-by-molecular-self-assembly-at-liquid-solid-interfaces
#16
Kohei Iritani, Kazukuni Tahara, Steven De Feyter, Yoshito Tobe
Host-guest chemistry in two-dimensional space, that is physisorbed monolayers of a single atom or a single molecular thickness on surfaces, has become a subject of intense current interest because of perspectives for various applications in molecular-scale electronics, selective sensors, and tailored catalysis. Scanning tunneling microscopy, with which we can visualize molecules in actual space, has been used as a powerful tool. For more than a decade, we have been investigating the self-assembly of a series of triangle-shaped molecules with a phenylene-ethynylene macrocycle, called dehydrobenzo[12]annulenes (DBAs), substituted by six flexible alkyl chains, forming hexagonal porous 2D molecular networks via van der Waals interactions between interdigitated alkyl chains at the interface of organic solvent and graphite...
February 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28202837/association-of-common-polymorphisms-with-gestational-diabetes-mellitus-in-japanese-women-a-case-control-study
#17
Yoshifumi Kasuga, Kenichiro Hata, Atsushi Tajima, Daigo Ochiai, Yoshifumi Saisho, Tadashi Matsumoto, Naoko Arata, Kei Miyakoshi, Mamoru Tanaka
Gestational diabetes (GDM) and type 2 diabetes (T2DM) share part of pathomechanism and several T2DM susceptibility genes are demonstrated to be associated with GDM. No information on the genetics of GDM, however, was available in Japanese women. In this study, T2DM risk variants (45 single nucleotide polymorphisms [SNPs] from 36 genes) identified in previous studies were genotyped using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry in a cohort of 171 Japanese women with GDM and 128 normal glucose tolerance (NGT) diagnosed by the new International Association of Diabetes in Pregnancy Study Group criteria...
February 16, 2017: Endocrine Journal
https://www.readbyqxmd.com/read/28199946/bioavailability-and-bioaccessibility-of-polycyclic-aromatic-hydrocarbons-from-post-pyrolytically-treated-biochars
#18
Isabel Hilber, Philipp Mayer, Varvara Gouliarmou, Sarah E Hale, Gerard Cornelissen, Hans-Peter Schmidt, Thomas D Bucheli
Bioaccessibility data of PAHs from biochar produced under real world conditions is scarce and the influence of feedstock and various post-pyrolysis treatments common in agriculture, such as co-composting or lacto-fermentation to produce silage fodder, on their bioavailability and bioaccessibility has hardly been studied. The total (Ctotal), and freely dissolved (i.e., bioavailable) concentrations (Cfree) of the sum of 16 US EPA PAHs of 43 biochar samples produced and treated in such ways ranged from 0.4 to almost 2000 mg/kg, and from 12 to 81 ng/L, respectively, which resulted in very high biochar-water partition coefficients (4...
February 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28199939/sorption-and-desorption-of-selected-non-steroidal-anti-inflammatory-drugs-in-an-agricultural-loam-textured-soil
#19
Y Zhang, G W Price, R Jamieson, D Burton, K Khosravi
Non-steroidal, anti-inflammatory drugs (NSAIDs) are widely used pharmaceutical products with analgesic and anti-inflammatory effects that are consistently detected in municipal wastewater systems and in municipal biosolids. Land application of biosolids and irrigation with reclaimed wastewater introduces these compounds into agricultural environments, which is an emerging issue of concern for ecosystem health. In this study, the sorption-desorption behaviour of four commonly consumed NSAIDs, including naproxen (NPX), ibuprofen (IBU), ketoprofen (KTF), and diclofenac (DCF), was examined in a loam textured soil exposed to either an individual-compound or a mixture of the four NSAIDs...
February 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28198485/structural-transformations-of-layered-structures-constructed-from-cu-ii-chloranilate-monomer-compounds
#20
Sadahiro Yagishita, Akiko Himegi, Ken Kanazashi, Tomomi Ohishi, Ryuta Ishikawa, Tomohiko Hamaguchi, Satoshi Kawata
Hydrogen-bond supported intercalation compounds constructed from three types of two-dimensional layers and common guests, {(Hha)2[Cu(CA)2(EtOH)2]}n (1), {(Hha)2[Cu(CA)2(EtOH)]}n (2), and {(Hha)2[Cu(CA)2]}n (3) (ha = hexylamine), have been synthesized and characterized. The hexylaminium cations are introduced between the anionic layers of the metal-chloranilate by not only electrostatic interactions but also hydrogen bonding interactions. These compounds show reversible EtOH adsorption and desorption accompanied by a structural transformation...
February 15, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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