Search Results
Results 551 - 600 of 4198
< 7 8 9 10 11 12 13 14 15 16 17 >
Horn Patrick J - - 2013
Targeted increases in monounsaturated (oleic acid) fatty acid content of refined cottonseed oil could support improved human nutrition and cardiovascular health. Genetic modifications of cottonseed fatty acid composition have been accomplished using several different molecular strategies. Modification of oleic acid content in cottonseed embryos using a dominant-negative protein approach, while ...
Couturier L I E - - 2013
Fatty acid (FA) signature analysis has been increasingly used to assess dietary preferences and trophodynamics in marine animals. We investigated FA signatures of connective tissue of the whale shark Rhincodon typus and muscle tissue of the reef manta ray Manta alfredi. We found high levels of n-6 polyunsaturated fatty acids ...
Makboul Makboul A - - 2013
A new pentacyclic triterpenoid, 3β,25-epoxy-3α,22β,23α-trihydroxy-olean-12-en-28-oic acid (1), together with seven known compounds, including five triterpenoids, β-amyrin (2), lantadene B (3), lantanilic acid (4), lantanolic acid (5) and ursolic acid (6) in addition to β-sitosterol (7) and benzoic acid (8) has been isolated from the leaves of Lantana montevidensis. Their chemical ...
Kugimiya Akimitsu - - 2013
The analysis of free amino acids in urine and plasma is useful for estimating disease status in clinical diagnoses. Changes in the concentration of free amino acids in foods are also useful markers of freshness, nutrition, and taste. In this study, the specific interaction between aminoacyl-tRNA synthetase (aaRS) and its ...
Wu Xu - - 2013
A facile bottom-up method for the synthesis of highly fluorescent graphene quantum dots (GQDs) has been developed using a one-step pyrolysis of a natural amino acid, L-glutamic acid, with the assistance of a simple heating mantle device. The developed GQDs showed strong blue, green and red luminescence under the irradiation ...
Kumar Vineet - - 2014
Cold water-soluble (CWSP) and hot water soluble polysaccharides (HWSP) from Tinospora cordifolia stems were isolated and purified in 2.99% and 1.99% yield respectively. Complete hydrolysis followed by paper chromatography and GLC analysis indicated the presence of l-rhamnose, l-arabinose, d-xylose, d-mannose, d-galactose and d-glucose in molar ratio of 0.857, 1.106, 0.727, ...
Serizawa Takeshi - - 2013
We demonstrate for the first time that cellulose nanofibers obtained from natural sources have the capability to hydrolyze the amide bonds of amino acid substrates in a chirality-specific manner. The chiral specificities were clearly correlated with the species of amino acid units and the crystal structures of cellulose.
Zhang Lei - - 2013
[Ru(p-cymene)Cl2]2-catalyzed 1,4-addition reactions between arylboronic acids and butyl acrylate and acrylamide in the presence of phenols were investigated, good to excellent yields were obtained. The addition of phenols remarkably promoted the protonolysis and inhibited the β-H elimination of the 1,4-addition intermediates, and also efficiently suppressed the protonolysis of arylboronic acids.
Tomohara Keisuke - - 2013
A method for asymmetric α-arylation of amino acid derivatives has been developed. The arylation was performed by Clayden rearrangement of ester enolates via memory of chirality to give hydantoins with aryl-substituted tetrasubstituted carbon in up to 99% ee.
Gołębiowski Marek - - 2013
Fatty acids as components of cuticular lipids of insects play a significant role in antifungal in protection against fungal infection. The chemical composition of cuticular and internal extracts obtained from all developmental stages of flesh flies Sarcophaga carnaria was identified. The fatty acids were detected using gas chromatography coupled with ...
Bryan Tyrel - - 2013
The enzyme 2-keto-3-deoxy-9-O-phosphonononic acid phosphatase (KDN9P phosphatase) functions in the pathway for the production of 2-keto-3-deoxy-D-glycero-D-galacto-nononic acid, a sialic acid that is important for the survival of commensal bacteria in the human intestine. The enzyme is a member of the haloalkanoate dehalogenase superfamily and represents a good model for the ...
West Thomas P - - 2013
Citric acid was produced by five species of the yeast Candida after growth on a medium containing soy biodiesel-based crude glycerol. After growth on a medium containing 10 g L(-1) or 60 g L(-1) crude glycerol for 168 hr at 30°C, Candida parapsilosis ATCC 7330 and C. guilliermondii ATCC 9058 produced the highest citric acid ...
Kumar-Phillips Geetha S - - 2013
Abstract The aim of this study was to determine the influence of acid-adaptation on the survival as well as adhesion and invasion of human intestinal cells by nine Campylobacter jejuni strains after exposure to different stress conditions. Acid-adapted and nonadapted C. jejuni were exposed to different secondary stress conditions such ...
Kannan Rengasamy Ragupathi Raja - - 2013
In continuation with the screening of biological properties of seagrasses, we isolated sulphated polysaccharides from Halodule pinifolia. This is the first report that indicates the presence of fucoidan-like Halodule pinifolia crude sulphated polysaccharide (HPCSP) that are commonly found in brown algae being present in marine angiosperms. Fucoidan-like structures such as ...
Duncton Matthew A J - - 2013
trans-2-(Trifluoromethyl)cyclopropylboronic acid N-methyliminodiacetic acid (MIDA) ester 5 was synthesized as a pure diastereomer from vinylboronic acid MIDA ester and (trifluoromethyl)diazomethane in a single step. An X-ray study confirmed the trans-stereochemistry around the cyclopropyl ring. Use of 5 in Suzuki reactions, with a variety of aryl or heteroaryl coupling partners, provided ...
Liu Feng-Jie - - 2014
A kind of novel diamino moiety functionalized silica nanoparticles with the diameter of ∼110nm was successfully prepared and characterised by transmission electron microscope (TEM) and elemental analysis. Capillary electrophoresis (CE) with this kind of nanoparticles as pseudostationary phase was developed for the simultaneous analysis of five organic acids in beverage ...
Divanovic Senad - - 2013
All three cytochrome P450 1 (CYP1) monooxygenases are believed to participate in lipid mediator biosynthesis and/or their local inactivation; however, distinct metabolic steps are unknown. We used multiple-reaction monitoring and liquid chromatography-UV coupled with tandem mass spectrometry-based lipid-mediator metabololipidomics to identify and quantify three lipid-mediator metabolomes in basal peritoneal and ...
Nasomphan Weerachai - - 2013
Highly water soluble polymer (DD) was prepared and evaluated for its fluorescence response towards various amino acids. The polymer consists of dansyl hydrazine unit conjugated into dextran template. The conjugation enhances higher water solubility of dansyl hydrazine moiety. Of screened amino acids, DD exhibited selective fluorescence quenching in the presence ...
Tian Jinhu - - 2013
Malonyl CoA-acyl carrier protein transacylase (MCAT, E2.3.1.39) is closely associated with the FASII pathway of fatty acid biosynthesis. However, the information about microalgal MCAT is scarce. In this study, a MCAT gene was isolated from Nannochloropsis gaditana with its deduced protein (NgMCAT) characterized with bioinformatic tools. The abundance of NgMCAT ...
Giesler Lucienne - - 2013
Wheat gluten hydrolysis, used to generate seasonings, was studied using peptidases from Flammulina velutipes or commercial Flavourzyme. L-Amino acids were added in a range from 0.5 to 75.0 mM, and L-isoleucine, L-leucine, L-valine and L-phenylalanine, were identified as the strongest inhibitors for both enzyme mixtures. L-serine inhibited Flammulina velutipes peptidases ...
Guangqi E - - 2013
We have produced and purified an active site mutant of the Escherichia coli cyclopropane fatty acid synthase (CFAS) by replacing the strictly conserved G236 within cyclopropane synthases, by a glutamate residue, which corresponds to E146 of the homologous mycolic acid methyltransferase, Hma, producing hydroxymethyl mycolic acids. The G236E CFAS mutant ...
Yao Yang - - 2013
Interest in mung bean as a functional food is growing. The objective of this study was to characterize the phenolic compounds, antioxidant activities, and antidiabetic activities of black mung beans. Five black mung beans were selected, and one green mung bean was included for comparison. The free phenolic acid and ...
Soliman Laiel C - - 2013
A lower dietary omega-6/omega-3 fatty acid ratio (< 4) has been shown to be beneficial in preventing a number of chronic illnesses. Interest exists in developing more rapid and sensitive analytical methods for profiling fatty acid levels in foods. An aqueous capillary electrophoresis method was developed for the simultaneous determination ...
Yu Bangwei - - 2013
Six partially acylated pentasaccharide resin glycosides, cairicosides A-F, were isolated from the aerial parts of Ipomoea cairica. These compounds were characterized as a group of macrolactones of simonic acid A, partially acylated with different organic acids. The lactonization site of 11S-hydroxyhexadecanoic acid (jalapinolic acid) was bound to the second saccharide ...
Kim Min-Ki - - 2013
Artificial digestive solution based on pepsin is essential for collecting metacercariae from fish. To promote the enzymatic reactivity of pepsin, the pH of the solution has to be adjusted to pH 1.0-2.0. Hydrochloride (HCl) is usually used for this purpose, but the use of HCl raises safety concerns. The aim ...
Menning Mark - - 2013
Cenicriviroc mesylate (CVC) is a potent dual antagonist of C-C chemokine receptor type 5 (CCR5) and C-C chemokine receptor type 2 (CCR2) in Phase 2b development as an entry inhibitor for HIV-1 infection treatment. CVC is a weak base exhibiting BCS IV characteristics with a highly pH dependent solubility profile ...
Chen Chun-Yen - - 2013
Microalgae have emerged as promising resources for highly unsaturated fatty acids. In this study, an indigenous microalga identified as Nannochloropsis oceanica CY2 was grown photoautotrophically to produce eicosapentaenoic acid (EPA; 20:5, n-3). Specific engineering strategies were employed to stimulate EPA accumulation in the microalgal cells. The results show that BG-11 ...
Bjermo Helena - - 2013
In this study, food is suggested as a major source of human exposure to perfluorinated alkyl acids (PFAA). We investigated relations between serum levels of PFAA in adults and diet/lifestyle factors nationwide in Sweden. In 2010-2011, adults (18-80 years, N = 270) recorded their diet for 4 days and answered ...
Twum Elvis A - - 2013
1-Iodonaphthalene-2,4-diamines in trifluoroacetic acid/chloroform give stable Wheland-like tetrahedral cationic species observable by NMR, through an initial intramolecular protonation. Dynamic equilibria allow proton-deuterium exchange of aromatic protons and provide a mechanism for deiodination of 1-iodonaphthalene-2,4-diamines.
Ohmi Youtaro - - 2013
The golden wonder: Various α-amino acids such as glucosaminic acid, galactosaminic acid, or N-acetyl-glucosaminic acid can be obtained from the corresponding glucosamine derivatives (amino sugars). This is achieved through an aqueous oxidation that catalyzed by Au nanoparticles dispersed on basic support under mild reaction conditions in water.
Mamidyala Sreeman K - - 2013
A new method for the synthesis of N-substituted isoindolinones and 3-arylaminophthalides was developed through aza-Wittig/cyclisation. The reaction of o-phthalaldehydic acid methyl ester with benzylic, aromatic and aliphatic azides gave N-isoindolinones whereas reaction of o-phthalaldehydic acid with the aromatic azides gave 3-arylaminophthalides.
Pustjens Annemieke M - - 2013
To enable structural characteristics of individual cell wall polysaccharides from rapeseed (Brassica napus) meal (RSM) to be studied, polysaccharide fractions were sequentially extracted. Fractions were analysed for their carbohydrate (linkage) composition and polysaccharide structures were also studied by enzymatic fingerprinting. The RSM fractions analysed contained pectic polysaccharides: homogalacturonan in which ...
Park Suhyoung - - 2014
We profiled and quantified glucosinolates (GSLs), anthocyanins, free amino acids, and vitamin C metabolites in forty-five lines of green and red cabbages. Analysis of these distinct cabbages revealed the presence of 11 GSLs, 13 anthocyanins, 22 free amino acids, and vitamin C. GSL contents were varied amongst the different lines ...
Zhang Yuanmei - - 2014
As one of the most important centres of origin for the genus Citrus L., China is rich in wild mandarin germplasm. In this study, phenolic compounds in the peels of 14 wild mandarin genotypes native to China were determined and their antioxidant capacities were evaluated using DPPH, FRAP, ABTS and ...
Li Xiangtang - - 2013
A fast microchip electrophoresis-nano-electrospray ionization-mass spectrometric method (MCE-nanoESI-MS) was developed for analysis of amino acids in biological samples. A glass/poly(dimethylsiloxane) hybrid microchip with a monolithic nanoESI emitter was used in the platform. The proposed MCE-nanoESI-MS analytical method showed high separation efficiency for amino acids. Baseline separation of an amino acid ...
Wang Tingting - - 2013
A novel sorbent for solid-phase extraction (SPE) was synthesized by chemical immobilization of ampholine on hybrid organic-inorganic silica material. The ampholine-functionalized hybrid organic-inorganic silica sorbent is consisted of aliphatic amine groups, carboxyl groups and long carbon chains, allowing for extraction of both acidic and basic compounds. The retention properties of ...
Klamrassamee Thepparat - - 2013
Fractionation of lignocellulosic biomass is a primary step for converting multi-structure biomass to biofuels and other industrial products in integrated biorefinery processes. Here, the effects of homogeneous and heterogeneous acid promoters (HNO3-, HCl-, H2SO4-, and H3PO4-activated carbons) on Clean Fractionation (CF), a single-step aqueous-organosolv fractionation, of eucalyptus wood chips was ...
Li Wen - - 2014
Five species of dried mushrooms are commercially available in China, namely Agrocybe cylindracea, Pleurotus cystidiosus, Agaricus blazei, Pleurotus eryngii, and Coprinus comatus, and their nonvolatile taste components were studied. Trehalose (12.23-301.63mg/g) and mannitol (12.37-152.11mg/g) were considered as the major mushroom sugar/polyol in the five test species. The total free amino ...
Thambugala Dinushika - - 2013
Flax (Linum usitatissimum L.) is one of the richest plant sources of omega-3 fatty acids praised for their health benefits. In this study, the extent of the genetic variability of genes encoding stearoyl-ACP desaturase (SAD), and fatty acid desaturase 2 (FAD2) and 3 (FAD3) was determined by sequencing the six ...
Walia Mayanka - - 2013
Apple pomace is generated in huge quantities at juice processing industries world-over and continuous efforts are being made for its inclusive utilization. In this study, apple seeds separated from industrial pomace were used for extraction of oil. The fatty acid composition, physico-chemical and antioxidant as well as in vitro anticancer ...
Cheng Chao - - 2013
Asymmetric synthesis of (R,R)- and (S,S)-1,8,9,16-tetrahydroxytetraphenylenes was achieved from starting material (2R,3R)-butane-2,3-diol and (2S,3S)-butane-2,3-diol respectively by utilizing a center-to-axis strategy. A series of crown ether compounds 20, 24, 25 and their corresponding enantiomers derived from chiral tetrahydroxytetraphenylene were synthesized in enantiomerically pure forms. Enantiomeric recognition properties of these hosts towards ...
Adamczyk-Woźniak Agnieszka - - 2013
Catechol esters of ortho-methoxyalkylphenylboronic acids have been synthesized and characterized by (17)O NMR spectroscopy. The results were compared with the data for the parent acids. The influence of intramolecular and intermolecular hydrogen bonds on the properties of the boronic acids has been discussed. The (17)O NMR data for the boronic ...
Oral Rasim Alper - - 2014
Several techniques have been used for hydroxymethylfurfural (HMF) detection in foods. Most of these involve the protein hydrolysation step process to determine the presence of organic acid with heat treatment. The affinity and separability of HMF to/from some proteins were exhibited in this study. Also, the dependency of HMF level ...
Takaishi Makoto - - 2013
A biosynthetic gene cluster for the 24-membered macrolactam antibiotic incednine was identified from the producer strain, Streptomyces sp. ML694-90F3. Among the putative incednine biosynthetic enzymes, a novel pyridoxal 5'-phosphate (PLP)-dependent β-glutamate-β-decarboxylase, IdnL3, was functionally characterized in vitro by demonstrating its (S)-3-aminobutyrate-forming activity with β-glutamate in the presence of PLP. Because ...
Mitani Takahiko - - 2013
The fruit of mume, Japanese apricot (Prunus mume Sieb. et Zucc.), was evaluated for its phenolics content, high performance liquid chromatography (HPLC) profile and antioxidative activities. The phenolics content of mume fruit was relatively high, the flesh of fully matured fruit containing up to 1% of phenolics on a dry ...
Li Yang - - 2013
The human Islet Amyloid Polypeptide (hIAPP) is the major constituent of amyloid deposits in pancreatic islets of type-II diabetes. IAPP is secreted together with insulin from the acidic secretory granules at a low pH of approximately 5.5 to the extracellular environment at a neutral pH. The increased accumulation of extracellular ...
Senger Nicholas A - - 2013
An improved method for the synthesis of N1-substituted orotic acid derivatives is reported. The method involves sequential incorporation of nitrogen atoms to the pyrimidine structure from simple starting materials and thus allows the synthesis of N1-substituted orotic acid derivatives with single (15)N label at either N-1 or N-3.
Saha Rumpa - - 2013
Picolinic acid, 2,2'-bipyridine and 1,10-phenanthroline promoted Cr(VI) oxidation of d-galactose to d-galactonic acid in three representative aqueous micellar media has been studied. The anionic surfactant (SDS) accelerated the rate of reaction while the cationic surfactant (CPC) and neutral surfactant (TX-100) retarded the reaction rate. Combination of bipy and SDS is ...
Barber Elizabeth - - 2013
Storage of fat into lipid droplets (LDs) is the key step in adipogenesis. Previously the omega-3 polyunsaturated fatty acid (n-3PUFA) eicosapentaenoic acid (EPA; C20:5n-3) has been shown to suppress LD formation, yet the actions of other n-3PUFA is unknown. Here, we examined the impact of the three major long chain ...
Montaser Rana - - 2013
Novel bioactive lipids were identified from a Guamanian cyanobacterium, the Pseudomonas aeruginosa quorum sensing inhibitor pitinoic acid A (1) and the anti-inflammatory pitinoic acids B (2) and C. The structure of 2 was confirmed by synthesis, which also allowed for biological evaluation. Since 2 is an ester of pitinoic acids ...
< 7 8 9 10 11 12 13 14 15 16 17 >