A study of the equilibrium surface properties (in water and in the presence of 0.01 M NaCl) of a novel series of anionic gemini surfactants, alkanediyl-α,ω-bis(sodium N-acyl-β-alaninates), is described. Parameters studied include cmc (critical micelle concentration), C20 (required to reduce t...
A magnesium complex using N-phthaloyl-β-alanine (NPA) as ligand was synthesized and its crystal structure was characterized by single-crystal X-ray diffraction analysis. The Fourier transformation infrared spectroscopy (FTIR), thermogravimetry (TG) and differential thermal analysis (DTA), fluor...
In this work, the equilibrium solubility of CO2 in aqueous solution of 10, 20, and 30 wt% sodium β-alaninate (Na-βala) was investigated using high pressure solubility cell. The solubility experiments were carried out at temperatures 303.15, 313.15, and 333.15 K and over CO2 partial pressure ra...
Gemcitabine is widely used for anticancer therapy. However, its short blood circulation time and poor stability greatly impair its application. To solve this problem, we prepared a poly (l-glutamic acid)-g-methoxy poly (ethylene glycol)-gemcitabine conjugate (l-Gem) with a 14.3 wt% drug-loading ...
Combretastatin A4 (CA4) possesses varying ability to cause vascular disruption in tumors, while the short half-life, low water solubility and deactivation of many CA4 analogs during storage limited its antitumor efficacy and drug stability. A novel macromolecular conjugate of CA4 (CA4-PL) was sy...
The effect of polymorphism on the purity of l-glutamic acid (l-Glu) is investigated by combining experiments and molecular simulations using l-aspartic acid (l-Asp) as an impurity. The results show that the content of l-Asp in β form is higher than that in α form, and the purity of l-Glu decre...
Triallylated l-glutamic acid and l-tyrosine (A3E amd A3Y) and their tetraallyl derivatives (A4E and A4Y) were synthesized by reactions of l-glutamic acid and l-tyrosine with allyl bromide in the presence of potassium carbonate, respectively. Thiol-ene photopolymerizations of the allylated amino ...
Organic acids and their salts have the potential to promote growth in weaner and grower-finisher pigs. The aim of this project was to evaluate the effects of benzoic acid, sodium butyrate and sodium butyrate coated with benzoic acid on the growth performance, total tract energy digestibility, gu...
A series of new Fe(III) complexes, [Fe(OVGln)2]Na (1), [Fe(OVGln)2]K (2), [Fe(OVGlu)2]Na (3) and [Fe(OVGlu)2]K (4), with Schiff base ligand derived from ortho-vanillin (OV) and l-glutamine (Gln) or l-glutamic acid (Glu), are presented. The complexes are extensively characterized with mass spectr...
Detection of heavy metal ions in water is important for environmental sustainability and food safety. Current fluorescent sensors interact with metal ions directly through chelation or chemical reactions. Those sensors are expensive to produce and often can detect only one ion at a time. Here we...
The precipitation process of l-glutamic acid from monosodium glutamate solution through acidification is studied by using hydrochloric acid and sulphuric acid. Both experimental and modelling methods are applied. The experiments have been carried out with a single feed semi-batch process applyin...
Mutual diffusion coefficient values for binary aqueous solutions of both L-glutamic acid (H2Glu) and sodium L-glutamate (NaHGlu) were measured with the Taylor dispersion technique, at T = 298.15 K, and concentrations ranging from (0.001 to 0.100) mol · dm−3. The results were discussed on the ba...
Single crystal of tri glycine sulphate has been grown in the presence and absence of l-glutamic acid and sodium sulphate by slow evaporation growth. The grown crystal was analyzed by single crystal X-ray diffraction. FTIR studies were used to confirm the presence of functional groups present in ...
Novel N-substituted noscapine derivatives were synthesized by a three-component Strecker reaction of cyclic ether of N-nornoscapine with varied aldehydes, in the presence of cyanide ion. Moreover, the corresponding amides were synthesized by the oxidation of cyanide moieties in good yields. The ...
Publisher SummaryThis chapter describes the properties of dihydroxycarboxylic and trihydroxycarboxylic acids, and related compounds. Mevalonic acid, HOCH2CH2C(CH3) (OH)CH2COOH, is an important intermediate in the study of many biosynthetic processes. A number of methods are available for the syn...
New 8-aza-16-thiasteroid analogues, benzo[a]thieno[f]quinolizines, have been synthesised by the [2 + 4] heteroannelation of 3,4-dihydroisoquinoline with 3-acylthiotetronic acids.
Summaryo1.A sensitive spray reagent is described for the detection of some naturally occurring tetronic acids on paper chromatograms and electrophoretic strips.2.New chromatography solvents are described and RF values are reported.3.The high voltage electrophoresis of tetronic acids is reported ...
All reasonable tautomers and rotamers of tenuazonic acid, which is considered to be of the highest toxicity amongst the Alternaria mycotoxins, were investigated by DFT calculations at different levels of theory in gas phase and in solution to obtain optimized geometries for further examinations....
3-Acyltetronic acids bearing different 3- and 5-substituents have been examined focussing on tautomerism and inter- and intramolecular hydrogen-bonding properties of these β,β′-tricarbonyl compounds in solution as well as in the solid state. Spectroscopic methods like NMR, IR, Raman-spectrosc...
In this paper, a Rh(III)-catalyzed cascade reaction of benzoyl acetonitriles/methylsulfones (1) with cyclic 2-diazo-1,3-dicarbonyl compounds (2) leading to a convenient and efficient preparation of diversely functionalized naphtho[1,8-bc]pyrans is presented. Mechanistically, the formation of the...
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