Tag: 100-200

On August 31, 2015, Wu, Enqi; Kim, Kyung Tae; Adidi, Sreenivas Kalyan; Lee, Young Keun; Cho, Jong Woon; Lee, Wonjae; Kang, Jong Seong published an article.Product Details of 32462-30-9 The title of the article was Enantioseparation and chiral recognition of α-amino acids and their derivatives on (-)-18-crown-6-tetracarboxylic acid bonded silica by capillary electrochromatography. And the article contained the following:

Capillary electrochromatog. was employed for enantioseparation of α-amino acids and their derivatives (-)-18-Crown-6-2,3,11,12-tetracarboxylic acid bonded on the silica was used as the chiral stationary phase and methanol/Tris-citric acid (20 mM, pH 3.0-4.5) (20:80, volume/volume) was used as mobile phase. The enantioseparation performance is discussed and structure-chiral separation relation were tried to be explained. The enantiomeric resolution was increased when the pH of the mobile phase decreased or hydrogen of amino acid was substituted with halogen. The resolution of 4-bromophenylalanine was 2.37 at pH 4.5, however, this value was increased to 3.35 at pH 3.0. Bromo- or chloro-substituted phenylalanine tended to show higher resolution than fluoro-substituted one. For fluoro-substituted phenylalanine the resolution was increased in order of 4-, 3- and 2-substituted one. α-Methyltryptamine did not show reasonable separation As the thermodn. study is a useful tool to understand the chiral recognition, the temperature effect on the enantioseparation was studied and the thermodn. parameters were calculated The most important mechanism of chiral recognition for the analytes tested could be barrier effects based on the thermodn. calculations The coefficient of determination between hydrophobicity and separation factor is 0.87, indicating favorable separation with higher hydrophobicity of amino acids. The experimental process involved the reaction of H-Phg(4-OH)-OH(cas: 32462-30-9).Product Details of 32462-30-9

The Article related to amino acid derivative enantioseparation chiral recognition capillary electrochromatog, chiral crowntetracarboxylic acid bonded silica column capillary electrochromatog, Organic Analytical Chemistry: Separations and other aspects.Product Details of 32462-30-9

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On July 31, 2022, Kasper, Karl; Abreu, Ilka N.; Feussner, Kirstin; Zienkiewicz, Krzysztof; Herrfurth, Cornelia; Ischebeck, Till; Janz, Dennis; Majcherczyk, Andrzej; Schmitt, Kerstin; Valerius, Oliver; Braus, Gerhard H.; Feussner, Ivo; Polle, Andrea published an article.COA of Formula: C3H6O4 The title of the article was Multi-omics analysis of xylem sap uncovers dynamic modulation of poplar defenses by ammonium and nitrate. And the article contained the following:

Xylem sap is the major transport route for nutrients from roots to shoots. In the present study, we investigated how variations in nitrogen (N) nutrition affected the metabolome and proteome of xylem sap and the growth of the xylem endophyte Brennaria salicis, and we also report transcriptional re-wiring of leaf defenses in poplar (Populus 3 canescens). We supplied poplars with high, intermediate or low concentrations of ammonium or nitrate. We identified 288 unique proteins in xylem sap. Approx. 85% of the xylem sap proteins were shared among ammonium- and nitrate-supplied plants. The number of proteins increased with increasing N supply but the major functional categories (catabolic processes, cell wallrelated enzymes, defense) were unaffected. Ammonium nutrition caused higher abundances of amino acids and carbohydrates, whereas nitrate caused higher malate levels in xylem sap. Pipecolic acid and N-hydroxypipecolic acid increased, whereas salicylic acid and jasmonoyl-isoleucine decreased, with increasing N nutrition. Untargeted metabolome analyses revealed 2179 features in xylem sap, of which 863 were differentially affected by N treatments. We identified 124 metabolites, mainly from specialized metabolism of the groups of salicinoids, phenylpropanoids, phenolics, flavonoids, and benzoates. Their abundances increased with decreasing N, except coumarins. Brennaria salicis growth was reduced in nutrient-supplemented xylem sap of low- and high- NO3–fed plants compared to that of NH4+-fed plants. The drastic changes in xylem sap composition caused massive changes in the transcriptional landscape of leaves and recruited defenses related to systemic acquired and induced systemic resistance. Our study uncovers unexpected complexity and variability of xylem composition with consequences for plant defenses. The experimental process involved the reaction of 2,3-Dihydroxypropanoic acid(cas: 473-81-4).COA of Formula: C3H6O4

The Article related to ammonium nitrate xylem sap dynamic modulation multiomic analysis, carbohydrates, metabolomics, nitrogen, phytohormones, proteomics, salicinoids, Plant Biochemistry: Development and Aging and other aspects.COA of Formula: C3H6O4

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Bajkacz, Sylwia; Ligor, Magdalena; Baranowska, Irena; Buszewski, Boguslaw published an article in 2021, the title of the article was Separation and Determination of Chemopreventive Phytochemicals of Flavonoids from Brassicaceae Plants.Category: alcohols-buliding-blocks And the article contains the following content:

The main aim of this study was to develop a method for the isolation and determination of polyphenols-in particular, flavonoids present in various morphol. parts of plants belonging to the cabbage family (Brassicaceae). Therefore, a procedure consisting of maceration, acid hydrolysis and measurement of the total antioxidant capacity of plant extracts (using DPPH assay) was conducted. Qual. anal. was performed employing thin-layer chromatog. (TLC), which was presented to be a suitable methodol. for the separation and determination of chemopreventive phytochems. from plants belonging to the cabbage family. The study involved the anal. of 25 vegetal samples, including radish, broccoli, Brussels sprouts, kale, canola, kohlrabi, cabbage, Chinese cabbage, red cabbage, pak choi and cauliflower. In addition, selected flavonoids content in free form and bonded to glycosides was determined by using an RP-UHPLC-ESI-MS/MS method. The experimental process involved the reaction of 3-Hydroxyphenylacetic acid(cas: 621-37-4).Category: alcohols-buliding-blocks

The Article related to flavonoid brassicaceae plant chemopreventive phytochem determination, cabbage family, flavonoids, glycosides, phenolic acids, Pharmaceuticals: Pharmacognostic Products and other aspects.Category: alcohols-buliding-blocks

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On May 31, 2015, Zhao, Yanfang; Xu, Lubin published an article.Recommanded Product: H-Phg(4-OH)-OH The title of the article was Chiral Separation of D,L-p-Hydroxyphenylglycine by Ligand Exchange Micellar Electrokinetic Capillary Chromatography. And the article contained the following:

D-P-Hydroxyphenylglycine (D-p-HPG) is an important intermediate for the synthesis of semi-synthetic antibiotics. Owing to the importance of optical purity of D-p-HPG, it is necessary to be able to chirally sep. D,L-p-HPG and monitor the enantiomeric purity of D-p-HPG in the pharmaceutical industry. A Cu(II) complex with L-valine (L-Val) was used as a chiral selector for ligand exchange chiral separation of D,L-p-HPG by micelle electrokinetic capillary chromatog. Optical resolution of D,L-p-HPG was obtained with a running buffer of 20 mM NH4OAc, 40 mM sodium dodecylsulfate (SDS), 10 mM Cu(II) and 20 mM L-Val at pH 8.5 in <10 min. The enantiomer migration order was L-p-HPG before D-p-HPG, which was most suitable for the determination of minor L-p-HPG in the presence of a large excess of D-p-HPG. Separation parameters such as pH, SDS concentration, the molar ratio of Cu(II) to L-Val, the concentration of the chiral metal complex, and capillary temperature were studied. The present method can also be used for assaying the enantiomeric excess of D-p-HPG. The experimental process involved the reaction of H-Phg(4-OH)-OH(cas: 32462-30-9).Recommanded Product: H-Phg(4-OH)-OH

The Article related to hydroxyphenylglycine enantioseparation ligand exchange micellar electrokinetic capillary chromatog, Organic Analytical Chemistry: Separations and other aspects.Recommanded Product: H-Phg(4-OH)-OH

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On December 31, 1994, Bazylak, Grzegorz published an article.Related Products of 2160-93-2 The title of the article was Chemometrically aided description of iminodiethanol retention on hydrocarbonaceous silica and cellulose layers. And the article contained the following:

Twelve model iminodiethanol congeners were studied using twenty six reversed phase thin layer chromatog. (RPTLC) systems comprising three different silica gel layers with varied hydrocarbonaceous modification. Methanol-water or acetonitrile – water, in different proportions were used as mobile phase. Solute log k values showed linear or quadratic dependence on the concentration of organic modifier in the mobile phase. Principal component anal. (PCA) was applied to all the exptl. results, including some paper chromatog. data taken from reference literature, to enable both explanation of the diverse selectivities of the different chromatog. systems, and the overall physicochem. classification of the activity of the aminoalcs. in polar solutions The experimental process involved the reaction of 2,2′-(tert-Butylazanediyl)diethanol(cas: 2160-93-2).Related Products of 2160-93-2

The Article related to iminodiethanol reversed phase thin layer chromatog, aminoalc reversed phase thin layer chromatog, Organic Analytical Chemistry: Separations and other aspects.Related Products of 2160-93-2

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On August 30, 2013, Tang, Kewen; Wu, Guohui; Zhang, Panliang; Zhou, Congshan; Liu, Jiajia published an article.SDS of cas: 32462-30-9 The title of the article was Experimental and model study on enantioselective reactive extraction of p-hydroxyphenylglycine enantiomers with metal phosphine complexes. And the article contained the following:

Equilibrium study on enantioselective reactive extraction of p-hydroxyphenylglycine (HPG) enantiomers employing (S)-BINAP-metal complexes as host (selector) was performed in a batch system at 5°C. A reactive extraction model with an interfacial reaction of HPG enantiomers with (S)-BINAP-metal complexes was established to describe the exptl. data. The equilibrium formation constants at the interface and other important parameters were determined exptl. The extraction system shows good selectivity towards HPG enantiomers. Complex with palladium (PdCl2-(S)-BINAP) exhibits the highest selectivity among the metal complexes studied, which is solubilized in the organic phase and preferentially extracts L-HPG from aqueous phase. Efficiency of extraction depends, often strongly, on a number of process variables, including types of organic solvents and metal precursors, concentration of ligand, pH, and temperature The model quant. predicts extraction performance as a function of key operating parameters, providing a simple computational approach to process optimization. The model was verified exptl. with excellent results. The experimental process involved the reaction of H-Phg(4-OH)-OH(cas: 32462-30-9).SDS of cas: 32462-30-9

The Article related to hydroxyphenylglycine enantioselective reactive extraction metal phosphine complex exptl modeling, Organic Analytical Chemistry: Separations and other aspects.SDS of cas: 32462-30-9

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On September 30, 2001, Shamsipur, Mojtaba; Poursaberi, Tahereh; Rouhani, Shohre; Niknam, Khodabakhsh; Sharghi, Hashem; Ganjali, Mohammad Reza published an article.Recommanded Product: 2160-93-2 The title of the article was Cobalt(II)-selective membrane electrode based on a recently synthesized benzo-substituted macrocyclic diamide. And the article contained the following:

A PVC-membrane electrode based on a recently synthesized 18-membered macrocyclic diamide is presented. The electrode reveals a Nernstian potentiometric response for Co2+ over a wide concentration range (2.0 × 10-6 – 1.0 × 10-2 M). The electrode has a response time of ∼10 s and can be used for at least 2 mo without any divergence. The proposed sensor revealed very good selectivities for Co2+ over a wide variety of other metal ions, and could be used over a wide pH range (3.0-8.0). The detection limit of the sensor is 6.0 × 10-7 M. It was successfully applied to the direct determination and potentiometric titration of Co ion. The experimental process involved the reaction of 2,2′-(tert-Butylazanediyl)diethanol(cas: 2160-93-2).Recommanded Product: 2160-93-2

The Article related to cobalt selective electrode benzo substituted macrocyclic diamide, Inorganic Analytical Chemistry: Apparatus and other aspects.Recommanded Product: 2160-93-2

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On September 30, 2022, Carla Guimaraes Sobrinho, Alessandra; Silva Corpes, Rosana; Isabel Portilho dos Santos, Kyouk; Maria Menezes Barra, Ivoneide; Kiyoshi Miyagawa, Helder; Silva Santos, Alberdan published an article.Formula: C3H6O4 The title of the article was Untargeted GC-MS Metabolomics applied to wild leaves and callus produced by plant tissue culture of Hibiscus sabdariffa L.. And the article contained the following:

Hibiscus sabdariffa L. is a naturalized medicinal species in Brazil commonly called a “vinagreira” and is a member of the Malvaceae Juss. family, which has a rich potential of bioactive compounds presenting extracts with antioxidant, antibacterial, anti-inflammatory, hepatoprotective, antiviral, antidiabetic, and antiobesity, among others. The production of secondary metabolites of medicinal plants using biotechnol. tools such as the culture of callus of plant tissues is increasingly being used to produce high-quality compounds under in vitro conditions. From this perspective, the objective of this work was to analyze the chem. compounds of the leaves and callus culture of H. sabdariffa using techniques of Gas Chromatog. Coupled to the Mass Spectrum (GC-MS),. The anal. methodol. used consisted of removal of liposol. compounds, acid hydrolysis, and derivatization, all stages were submitted to ultrasonic-assisted agitation, using a reduced amount of biomass. Based on the results obtained in the study, a total of 38 metabolites identified by GC-MS anal. can be observed Among the identified substances, protocatechuic acid (26A) stands out as the main constituent, with a relative abundance of 26.86% and 16.68% for leaves and callus of H. sabdariffa, resp. The principal component anal. (PCA) allowed the discrimination of the chem. composition of each sample, being useful for the observation and detection of the compounds trends patterns. The anal. of the hierarchical group combined with the heat map represented the visual relationship between the samples of the data set indicating the values of higher and lower concentrations of chem. compounds resp., confirming that protocatechuic acid is the most abundant, for the leaves and callus of H. sabdariffa, followed by eicosanoid and isocitric acid, produced only in callus. It was concluded that the GC-MS technique combined with chemometric tools, helped identify the diversity of the compounds present in the leaves and callus of H. sabdariffa and that callus culture enables the production of bioactive compounds continuously and uniformly in a controlled environment and free of contamination. The experimental process involved the reaction of 2,3-Dihydroxypropanoic acid(cas: 473-81-4).Formula: C3H6O4

The Article related to hibiscus leaf callus tissue culture gcms metabolomics, Pharmaceuticals: Pharmacognostic Products and other aspects.Formula: C3H6O4

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On February 28, 2019, Shoukat, Usman; Baumeister, Eva; Pinto, Diego D. D.; Knuutila, Hanna K. published an article.Electric Literature of 2160-93-2 The title of the article was Thermal stability and corrosion of tertiary amines in aqueous amine and amine-glycol-water solutions for combined acid gas and water removal. And the article contained the following:

Thermal stability and corrosion of seven tertiary amines (20 weight%) solutions in water and water-glycol [ethylene glycol (MEG)/tri-ethylene glycol (TEG)] loaded with CO2 in stainless steel reactors has been studied for combined acid gas removal along with hydrate control. The pKa of the tested amines varied from 7.85 to 9.75. Titration and inductivity coupled plasma mass spectrometry (ICP-MS) are used to quantify the remaining alkalinity and metal concentrations in amine solutions resp. The presence of MEG and TEG profoundly influenced the amine stability. Triethanolamine had the highest thermal stability. Furthermore, the results also show that an increase in pKa generally decreases corrosion. 3-(Diethylamino)-1,2-propanediol (DEA-1,2-PD) has the lowest corrosion in water and water-TEG solutions while 2-(Diethylamino)ethanol (DEEA) has the least corrosion in water-MEG solutions The experimental process involved the reaction of 2,2′-(tert-Butylazanediyl)diethanol(cas: 2160-93-2).Electric Literature of 2160-93-2

The Article related to thermal stability corrosion tertiary amine glycol water solution, Placeholder for records without volume info and other aspects.Electric Literature of 2160-93-2

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On December 31, 2020, Kozlowicz, Katarzyna; Rozylo, Renata; Gladyszewska, Bozena; Matwijczuk, Arkadiusz; Gladyszewski, Grzegorz; Chocyk, Dariusz; Samborska, Katarzyna; Piekut, Jolanta; Smolewska, Marzena published an article.Product Details of 621-37-4 The title of the article was Identification of sugars and phenolic compounds in honey powders with the use of GC-MS, FTIR spectroscopy, and X-ray diffraction. And the article contained the following:

This work aimed at the chem. and structural characterization of powders obtained from chestnut flower honey (HFCh) and honey with Inca berry (HBlu). Honey powders were obtained by spray drying technique at low temperature (80/50 °C) with dehumidified air. Maltodextrin (DE 15) was used as a covering agent. The isolation and evaluation of phenolic compounds and sugars were done by gas chromatog.-mass spectrometry anal. SEM, Fourier-transform IR (FTIR) spectroscopy, and X-ray diffraction were performed to determine the morphol. of the studied honey powders. The obtained results showed that the content of simple sugars amounted to 72.4 and 90.2 g x 100 g-1 in HFCh and HBlu, resp. Glucose was found to be the dominant sugar with a concentration of 41.3 and 51.6 g x 100 g-1 in HFCh and HBlu, resp. 3-Phenyllactic acid and ferulic acid were most frequently found in HFCh powder, whereas m-coumaric acid, benzoic acid, and cinnamic acid were the most common in HBlu powder. The largest changes in the FTIR spectra occurred in the following range of wavenumbers: 3335, 1640, and below 930 cm-1. The X-ray diffraction profiles revealed wide peaks, suggesting that both honey powders are amorphous and are characterized by a short-range order only. The experimental process involved the reaction of 3-Hydroxyphenylacetic acid(cas: 621-37-4).Product Details of 621-37-4

The Article related to honey powder sugar phenolic compound gcms ftir xray diffraction, Placeholder for records without volume info and other aspects.Product Details of 621-37-4

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