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Results 301 - 350 of 2880
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Jun Hyun-Il - - 2014
The antioxidant activities of various extracts from purple perilla (Perilla frutescens var. acuta) leaves based on 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging ability, 2,2-azino-bis-(3-ethylenebenzothiozoline-6-sulfonic acid) (ABTS) radical cation scavenging ability, and reducing power were investigated. Purple perilla leaves were initially extracted with 80% ethanol and then sequentially fractionated according to solvent polarity. ...
Devi Rooma - - 2013
A xanthine oxidase (XOD) from buttermilk was immobilized covalently onto boronic acid functionalized gold coated iron nanoparticles (Au@FeNPs) electrodeposited on pencil graphite (PG) electrode, via the boroester linkages, between free hydroxyl groups of boronic acid, α-COOH and-NH2 groups of enzyme. The surface functionalization of Fe/Au nanoparticles with boronic acid (Au@FeNPs) ...
Wang Aihong - - 2013
A new fluorescent labeling reagent has been developed for the determination of fatty acids by HPLC with fluorescence detection. The derivatization conditions including amount of derivatization reagent, temperature and type of catalyst were investigated, the results indicated that the reaction proceeded within 30 min at 90°C in the presence of ...
Boswell Charles Andrew - - 2013
A known limitation of iodine radionuclides for labeling and biological tracking of receptor targeted proteins is the tendency of iodotyrosine to rapidly diffuse from cells following endocytosis and lysosomal degradation. In contrast, radiometal-chelate complexes such as indium-111-1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (In-111-DOTA) accumulate within target cells due to the residualizing properties of the ...
Kastelein John J P JJ Department of Vascular Medicine, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands. Electronic address: - - 2014
Omega-3 fatty acids in free fatty acid form have enhanced bioavailability, and plasma levels are less influenced by food than for ethyl ester forms. The aim was to evaluate the safety and lipid-altering efficacy in subjects with severe hypertriglyceridemia of an investigational pharmaceutical omega-3 free fatty acid (OM3-FFA) containing eicosapentaenoic ...
Widsten Petri - - 2014
Fibre crosslinking with polycarboxylic acids can be used to improve certain properties of paper products, including wet tensile and compressive strength. In the present work it was proposed that citric acid (CA) crosslinks the cellulosic fibres of linerboard by self-catalysed esterification of cellulosic hydroxyl groups, which makes an additional catalyst ...
Bizjak Jan - - 2013
During the two growing seasons the evolution of primary metabolites and wide range of polyphenols in the ´Braeburn´ apple peel during the advanced maturation were investigated. During the five weeks sucrose significantly increased, whereas fructose and glucose fluctuated around the same level in one season and decreased in another. Regarding ...
Benetti Ana Raquel - - 2013
To investigate the effect of prolonged chemical challenges on color stability, staining susceptibility, and roughness of a silorane composite material when compared to methacrylate-based composites. Initial color and roughness were registered for specimens fabricated from methacrylate or silorane composites. Specimens were individually stored at 37°C in 0.02N citric acid, 0.02N ...
Mensah Enoch - - 2013
In control: A chiral phosphoric acid catalyst significantly enhances or completely overrides the inherent regioselective acetalization profiles exhibited by monosaccharide-derived 1,2-diol substrates. This study represents the first example of chiral-catalyst-directed regio- and enantioselective intermolecular acetalizations, which are complementary to existing methods for substrate-controlled functionalization of polyols.
Mbesse Kongbonga Yvon G - - 2014
Spectrochemical analyses of organic liquid media such as vegetable oils and sweetened water were performed with the use of LIBS. The aim of this work is to study, on the basis of spectral analyses by LIBS technique of "Swan band" of C2 emitted by different vegetable oils in liquid phase, ...
Yli-Juuti Taina - - 2013
Condensation and evaporation modify the properties and effects of atmospheric aerosol particles. We studied the evaporation of aqueous succinic acid and succinic acid/ammonium sulfate droplets to obtain insights on the effect of ammonium sulfate on the gas/particle partitioning of atmospheric organic acids. Droplet evaporation in a laminar flow tube was ...
Bansal A - - 2013
A series of 2-hydroxypropanoic acid derivatives (1-26) was synthesized and characterized by physicochemical and spectral means. The synthesized compounds were evaluated for their in vitro antimicrobial potential and the results indicated that compounds 5 and 12 were found to be the most potent antimicrobial agents having pMICam values 1.67 and ...
Del Olmo Ana - - 2013
Lipolysis, lipid peroxidation, and colorimetric characteristics of Serrano hams from Duroc and Large White pigs along a 15-mo curing period were investigated. Physicochemical parameters of both types of hams evolved similarly during curing. Twelve of 13 free fatty acids (FFAs) increased during curing, eicosatrienoic acid being the only exception. Linoleic, ...
Suresh Arumuganainar - - 2013
Renewable energy from lipid removed microalgal residues (LRμARs) serves as a promising tool for sustainable development of the microalgal biodiesel industry. Hence, in this study, LRμAR from Ettlia sp. was characterized for its physico-biochemical parameters, and applied to various pretreatment to increase the biodegradability and used in batch experiments for ...
Akoz Enise - - 2013
Candida rugosa lipase was immobilized with a sol-gel encapsulation procedure in the presence and absence of a calix[n]arene carboxylic acid derivative grafted onto magnetic nanoparticles or in the presence of the calix[n]arene carboxylic acid derivative with Fe3O4 magnetic nanoparticles as an additive. Through the enantioselective hydrolysis of racemic naproxen methyl ...
Du Jiao - - 2013
A novel and sensitive carbon fiber electrode (CFE) modified by graphene flowers was prepared and used to simultaneously determine ascorbic acid (AA), dopamine (DA) and uric acid (UA). SEM images showed that beautiful and layer-petal graphene flowers homogeneously bloomed on the surface of CFE. Moreover, sharp and obvious oxidation peaks ...
Adamson Aiko - - 2013
Complexation energies and acidities of 19 primary, secondary and tertiary amine-boranes were investigated using MP2/6-311+G(d,p) and B3LYP/6-311+G(d,p) methods. Gas phase acidities for free amines were also calculated. Acidity values for studied complexes range from 327.3 to 349.1 kcal mol(-1) and the most acidic are the ones with direct connection between deprotonation ...
Koehler Jens - - 2013
Novel biodegradable materials with tunable hydrolytic degradation rate are prepared by grafting of phosphonoethylated polyglycidols with polyesters. First the hydrolytically degradable polyester grafts are attached to polyglycidols partially grafted with phosphonoethylated diethyl esters through chemical-catalyzed grafting using tin(II) octanoate, then the diethyl ester groups are chemoselectively converted to the corresponding ...
Iqbal Qumer - - 2013
Studies were conducted to investigate the accumulation pattern of capsaicinoids and antioxidants such as carotenoids, ascorbic acid and phenolic compounds in three hot pepper hybrids at five different harvesting stages: immature green, mature green, color break, red ripe and dried fruit. Capsaicin and dihydrocapsaicin contents were maximum at mature green ...
Yao Mingfei - - 2013
Polymethoxyflavones (PMFs) are bioactive flavonoids found in citrus fruits that have been shown to have potential health promoting properties. However, their application as nutraceuticals in functional foods and beverages is currently limited due to their low water solubility and high melting point. The oral bioavailability of lipophilic compounds can be ...
Pavlíček Václav - - 2013
A capillary system formed by combining 25 μm and 100 μm id capillaries was used in the short-end injection mode to determine creatinine and uric acid in human urine. The separation was performed at an electric field intensity of 2.3 kV/cm. Creatinine was determined in a background electrolyte with a ...
Pretti L - - 2014
A simple and rapid method was developed for in vivo simultaneous determination of ascorbic-acid and antioxidant capacity in microdialysates from cladodes of Opuntia ficus-indica (L.) Miller. The method is verified in water-stressed plants, as compared with a well-watered test controls. The microdialysis probe construction and insertion procedure was specifically developed ...
Sun Mojie - - 2013
Highly ordered TiO2 nanotubes were synthesized using electrochemical anodization method and then were modified by semiconductor CdS particles to construct CdS/TiO2 electrode. The synthesized CdS/TiO2 nanotubes were used for the experimental study of influences of PH and added electronic voltage on humic acid degradation through photoelectrocatalysis. The results indicated that ...
Kim Wook Hyun - - 2013
The performance of poly(3-hexylthiophen) (P3HT) and [6, 6]phenyl C61 butyric acid methyl ester ([60]PCBM)-based inverted bulk-heterojunction (BHJ) polymer solar cells (PSCs) is enhanced by the modification of zinc oxide (ZnO)/BHJ interface with carboxylic-acid-functionalized self-assembled monolayers (SAMs). Under simulated solar illumination of AM 1.5 (100 mW/cm2), the inverted devices fabricated with ...
Ratanaburee Anussara - - 2013
The aim was to produce Nham that was enriched with γ-aminobutyric acid (GABA); therefore two GABA producing lactic acid bacteria (Pediococcus pentosaceus HN8 and Lactobacillus namurensis NH2) were used as starter cultures. By using the central composite design (CCD) we showed that addition of 0.5% monosodium glutamate (MSG) together with ...
Trentin Claudia M - - 2013
This work investigates the continuous production of alkyl esters from soybean fatty acid (FA) charges using immobilized Novozym 435 as catalyst. The experiments were performed in a packed-bed bioreactor evaluating the effects of FA charge to alcohol (methanol and ethanol) molar ratio, from 1:1 to 1:6, substrate flow rate in ...
Fan Jilian - - 2013
There is growing interest in engineering green biomass to expand the production of plant oils as feed and biofuels. Here, we show that PHOSPHOLIPID:DIACYLGLYCEROL ACYLTRANSFERASE1 (PDAT1) is a critical enzyme involved in triacylglycerol (TAG) synthesis in leaves. Overexpression of PDAT1 increases leaf TAG accumulation, leading to oil droplet overexpansion through ...
Deepankumar Kanagavel - - 2013
Here we enhanced the stability and biophysical properties of mRFP1 through a combination of canonical and non-canonical amino acid mutagenesis. The global replacement of proline residue with (2S, 4R)-4-fluoroproline [(4R)-FP] into mRFP1 led to soluble protein but lost its fluorescence, whereas (2S, 4S)-4-fluoroproline [(4S)-FP] incorporation resulted in insoluble protein. The ...
Aleixandre-Tudó José Luis - - 2013
The effect of prefermentative and postfermentative caffeic acid addition (CFA), prefermentative cold maceration and micro-oxygenation on the phenolic and color composition of Tempranillo wines was investigated. Cold soaking and dry ice addition were performed as prefermentative techniques. Wines were analyzed after the end of the malolactic fermentation, and after six ...
Daba Tadessa - - 2013
The amino groups of wheat β-amylase (WBA) were modified by 2,4,6-trinitrobenzenesulfonic acid (TNBS), 2,4-bis (O-methoxypolyethylene glycol)-6-chloro-s-triazine (mPEG), and glutaraldehyde (GA) to improve its thermal stability and activity. Modification of WBA by 5mM TNBS, 4.8μM mPEG and 11mM GA improved its T50 (the temperature at which 50% of its activity is ...
Wunderlich Christoph H - - 2013
In this work we present a novel 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) radical phosphoramidite building block, which can be attached to the 5'-terminus of nucleic acids. To investigate the paramagnetic relaxation enhancement (PRE) emanating from this radical center, we incorporated the TEMPO label into various types of RNAs. We measured proton PREs ...
An Meiling - - 2013
The Antarctic ice microalgae Chlamydomonas sp. ICE-L which is highly resistant to salt stress holds promise in providing an alternative species for the production of microalgal oil. We studied the effects of the alga in confrontation with NaCl stress on the growth, oil yield and expression of fatty acid desaturase ...
Zhang Shijuan - - 2014
A novel and interesting pre-column derivatisation method was developed for the analysis of triterpenic acids by high-performance liquid chromatography (HPLC) with fluorescence detection. Each triterpenic acid produced two HPLC peaks with similar peak areas after derivatising with chiral 1-(9H-carbazol-9-yl) propan-2-yl-methanesulfonate (CPMS), while the fatty acid derivative of CPMS had only ...
Xiao Ni - - 2013
In this work, graphene materials have been prepared via thermal treatment of graphene oxides with the aid of intercalated nitric acid. The nitric acid not only favors the expansion of graphene but also benefits for the generation of pores into graphene. The specific surface area of such graphene frameworks is ...
Hu Jie - - 2013
Lateral flow assays (LFAs) as rapid analytical techniques promise to be widely used in point-of-care (POC) diagnostics because of their affordability and simplicity. However, LFAs still suffer from low sensitivity in detection of various biomarkers, e.g., nucleic acids. In this study, we developed a simple and general one-step signal amplification ...
Mandal Somnath - - 2014
Lipoxygenase (Lox) mediated oxidation of polyunsaturated fatty acids (PUFA) in mature soya seeds results in objectionable flavour. In the present study, Lox isozymes were purified to near homogeneity (107-fold). Lox-2 and 3 displayed remarkable kinetic preference (1.7 and 1.5-fold, respectively) for low PUFA ratios (LA/LeA) (PRs) among the selected PUFA ...
Abulateefeh Samer R - - 2013
Abstract Context: The excellent gelling and safety profiles of alginic acid combined, however, with drawbacks of its ionotropically crosslinked beads (i.e. their quick release of loaded drugs) prompted us to chemically modify alginic acid. Objective: Alginic acid was chemically conjugated with four amines of varying hydrophilic-hydrophobic properties (i.e. tris(hydroxymethyl)methyl-, allyl-, ...
Li Changmo - - 2013
To elucidate the relation between heat-induced cis/trans isomerization and reaction temperature and energy in unsaturated lipids, we investigated the molecular mechanism of the heat-induced cis/trans isomerization of 18:1 isomers. Triolein (18:1,9c) was heated at two range temperatures (130, 160, 190, 220 °C and 135, 140, 145, 150, 155 °C) and ...
Ma Fang - - 2013
In the present paper, a new type of Lewis acid-base complex BX3•••Li@Calix[4]pyrrole (X = H and F) was designed and assembled based on electride molecule Li@calix[4]pyrrole (as a Lewis base) and the electron deficient molecule BX3 (as a Lewis acid) by employing quantum mechanical calculation. The new Lewis acid-base complex ...
Li Yilin - - 2013
The effect of chemical pretreatments on the color and carotenoid content of yellow discolored channel catfish fillets was studied. The color and carotenoid content of the fillets were analyzed by the L*a*b* color system and high-performance liquid chromatography, respectively. Untreated fillets turned more yellow and darker after 12-d storage. Sodium ...
Guyon Francois - - 2014
High performance liquid chromatography linked to isotope ratio mass spectrometry via an interface allowing the chemical oxidation of organic matter (HPLC-co-IRMS) was used to simultaneously determine carbon 13 isotope ratio (δ(13)C) of organic acids, glucose and fructose in lime and lemon juices. Because of the significant difference between organic acids ...
Tohnai Norimitsu - - 2013
Organic-inorganic hybrid salts based on 1,5-bisaminophenylanthracene were able to overcome aggregation-induced quenching and emit multiple colours of luminescence according to the counter acid employed. Moreover, the emission colour could be reversibly and dynamically changed on absorption and desorption of guest molecules.
Dükkancı Meral - - 2013
The sonolytic degradation of butyric acid was investigated in an ultrasonic reactor emitting waves at 850 kHz. The effects of the ultrasonic power, the initial concentration of butyric acid, and the addition of H2O2 were studied on the degradation of butyric acid. In the sonication of butyric acid, degradation degrees as ...
Jang Yu-Sin - - 2013
Clostridium acetobutylicum has been considered as an attractive platform host for biorefinery due to its metabolic diversity. Considering its capability to overproduce butanol through butyrate, it was thought that butyric acid can also be efficiently produced by this bacterium through metabolic engineering. The pta-ctfB-deficient C. acetobutylicum CEKW, in which genes ...
Liu Min - - 2013
A novel hypoxanthine biosensor fabricated by immobilizing the xanthine oxidase (XOD) onto the phosphonic acid-functionalized silica (SiO2-P) film on the surface of glassy carbon electrode (GCE) was designed and constructed in this work. A biomimetic platform was designed with the phosphonic acid-functionalized silica nanoparticles (SiO2-P NPs) synthesized by the method ...
Revellame Emmanuel D - - 2013
Lipid-enhancement of activated sludges was conducted to increase the amount of saponifiable lipids in the sludges. The sludges were obtained from a conventional activated sludge (CAS) and an oxidation ditch process (ODP). Results showed 59-222% and 150-250% increase in saponifiable lipid content of the sludges from CAS and ODP, respectively. ...
Nosheen Asia - - 2013
Safflower oil is a complex mixture of C18 saturated and unsaturated fatty acids amongst other fatty acids, and achieving separation between these similar structure components using one dimensional gas chromatography (GC) may be difficult. This investigation aims to obtain improved separation of fatty acid methyl esters in safflower oil, and ...
Vishnu Nandimalla - - 2013
Unusual electropolymerization of aniline to polyaniline (PANI) in a neutral pH solution has been successfully demonstrated using a multiwalled carbon nanotube (MWCNT) modified gold electrode (Au-MWCNT@PANIpH7). The modified electrode showed highly redox active surface confined peaks corresponding to the molecular transitions of leucoemeraldine-emeraldine and emeraldine-pernigraniline in pH 7 phosphate buffered ...
Chiavazza Enrico - - 2013
The synthesis, NMR properties and preliminary polarization tests on protonated and perdeuterated forms of α-trimethylglutamine (NMe3 Gln), α-trimethylglutamate (NMe3 Glu) and ε-trimethyllysine (NMe3 Lys) are reported. The (15) N-permethylated, perdeuterated amino acids display very long (15) N-T1 values, ranging between 190 and 330 s, are well polarized by the dynamic ...
Bøe Sigurd Leinæs - - 2013
Photochemical internalization (PCI) is a method for releasing macromolecules from endosomal and lysosomal compartments. The PCI approach uses a photosensitizer that localizes to endosomal and lysosomal compartments, and a light source with appropriate light spectra for excitation of the photosensitizer. Upon photosensitizer excitation, endosomal and lysosomal membranes are destroyed, due ...
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