Month: December 2022

Wang, Ben published the artcileEstimating self-healing capability of carbon fiber/epoxy composites using ultrasonic guided wave, Synthetic Route of 7575-23-7, the main research area is epoxy carbon fiber composite ultrasonic guided wave self healing.

In this work, two types of self-healing composite laminates with embedded 6 and 12 weight% microcapsules resp., were prepared The guided waves were activated and captured using piezoelec. transducer in a pitch-catch approach. Mode I interlaminar fracture tests were conducted using double cantilever beam specimens, and the effects of concentration of microcapsules on the interlaminar properties of specimens were investigated. The interlaminar fracture surfaces of self-healing specimens were observed to support the anal. of mech. tests and guided wave detecting results. The results show that the self-healing efficiency of specimens with high-concentration microcapsules is less than that of specimens with low-concentration microcapsules. Meanwhile, low-concentration microcapsules reduce the interlaminar properties of specimens. Two guided-wave parameters, namely signals peak value and waveform similarity, were set and correlated with the self-healing capability of specimens. When the specimens were damaged, the peak value of response signals decreases, and the waveform difference between the response signal and reference signal becomes larger. When the specimens were healed, the peak value of response signals rises, and the waveform difference between them becomes smaller.

Polymer Testing published new progress about Carbon fibers Role: MOA (Modifier or Additive Use), USES (Uses) (T 300). 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Synthetic Route of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Li, Yuguo published the artcileComprehensive chemical characterization of dissolved organic matter in typical point-source refinery wastewaters, Related Products of alcohols-buliding-blocks, the main research area is organic compound petroleum refinery wastewater FTIR GC MS fluorometry; Chemical composition; Dissolved organic matter; EEM; FT-ICR MS; GC-MS; Point-source wastewater.

In petroleum refineries, the elec. desalting, distillation, and stripping processes could generate large amounts of wastewaters that contain toxic substances. In this study, eight wastewater samples were collected from the three typical refining processes for comprehensive chem. characterization of the dissolved organic matter (DOM) using excitation emission matrix fluorescence spectroscopy, gas chromatog.-mass spectrometry, and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Results showed that protein-like components and benzene were ubiquitous in all these wastewaters. Oxygen-containing volatile organic compounds had higher contents in crude distillation and stripping wastewater than those in elec. desalting wastewater. Among the three refinery processes, mol. composition of DOM in the stripping wastewater had the highest complexity. The Ox and OxSy class species assigned from the neg.-ion electrospray ionization FT-ICR MS were dominant in all wastewaters. The OxS2 class species which were effectively removed during stripping treatment had highest relative abundance in stripping influent. These results are instructive to guide the development of ”divide and conquer” and would improve the treatment and management of refinery wastewater streams.

Chemosphere published new progress about Chemical oxygen demand. 584-02-1 belongs to class alcohols-buliding-blocks, name is 3-Pentanol, and the molecular formula is C5H12O, Related Products of alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Reisinger, David published the artcileStreamlined concept towards spatially resolved photoactivation of dynamic transesterification in vitrimeric polymers by applying thermally stable photolatent bases, Formula: C17H28O8S4, the main research area is photoactivation dynamic transesterification vitrimeric polymer thermally stable photolatent base.

Through a well-targeted design, vitrimers are able to reorganise their three-dimensional covalently crosslinked network structure by associative exchange reactions when the so-called topol. freezing transition temperature (Tv) is exceeded. Although in the past decade a vast number of vitrimers have been developed, there is only a very limited number of elaborate strategies for enabling a controlled and spatially resolved onset of the exchange reactions above Tv. Herein, we describe a convenient approach for a locally controllable photoactivation of vitrimeric properties in a covalently crosslinked thiol-epoxy network by the UV-mediated release of a strong amidine base acting as an efficient transesterification catalyst. In contrast to previous work, the applied photolatent catalysts benefit from superior solubility properties, adequate curing characteristics in the non-activated state (the addition of a supplementary catalyst is not required) and an excellent thermal stability. The spatially controlled activation of vitrimeric properties in terms of dynamic transesterification, macroscopically visible as a viscoelastic flow, is demonstrated by stress relaxation studies and a reshaping experiment Moreover, we confirm that an undesired purely thermally induced catalyst release can be entirely excluded.

Polymer Chemistry published new progress about Glass transition temperature. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Formula: C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ono, Tetsuya published the artcileElectrocatalytic Oxidation of Carbohydrates Mediated by Nitroxyl Radical-Modified Electrodes in Aqueous Solution, Application of 3-(1H-Pyrrol-1-yl)propan-1-ol, the main research area is electrocatalysis oxidation carbohydrate mediated nitroxyl radical modified electrode.

The electrocatalytic activity of a 2,2,6,6-tetramethylpipridine-N-oxyl (TEMPO)-modified electrode toward the oxidation of carbohydrates in phosphate buffer solution was studied under neutral aqueous solution conditions at 25°. The modified electrode was prepared on the surface of a glassy C electrode by the electrochem. polymerization of a TEMPO precursor containing a pyrrole side chain. Cyclic voltammetric studies showed that the anodic peak current increased with the concentration of carbohydrates in a dose-dependent manner.

Electroanalysis published new progress about Chemically modified electrodes. 50966-69-3 belongs to class alcohols-buliding-blocks, name is 3-(1H-Pyrrol-1-yl)propan-1-ol, and the molecular formula is C7H11NO, Application of 3-(1H-Pyrrol-1-yl)propan-1-ol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Alizadeh, Mohamad published the artcilepH-Responsive MFPTT microcapsules containing dimethyl sulfoxide: Preparation, characterization and tuning the release behavior of microcapsule contents, HPLC of Formula: 7575-23-7, the main research area is melamine formaldehyde pentaerythritol tetrakis mercaptopropionate microcapsule epoxy coating; corrosion inhibitor.

The new approach to intelligent systems is the use of stimuli-responsive micro/nanocapsules to release active ingredients. This work focuses on the preparation of melamine formaldehyde pentaerythritol tetrakis (3-mercaptopropionate) (MFPTT) microcapsules and represent a versatile platform to encapsulate active agent that release capsule contents under alk. condition. DMSO (DMSO) was selected as a solvent that can dissolve a wide range of chem. compound Exptl. results demonstrated that the properties of the capsule shell play a key role in the release rate. Permeability and release of encapsulated payloads were investigated by Field emission SEM (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and UV-visible spectroscopy (UV-vis). It is found that the morphol. of capsules was affected by changing the pH-sensitive agent content. The particle size of capsules that were synthesized at different conditions were in the range of 800 to 9000 nm with a polydispersity index < 0.4. The chem. structure of capsules was investigated with Fourier-transform IR spectroscopy (FTIR), Elemental anal. (ICP) and Energy-dispersive X-ray (EDX). The shell thickness and core fraction of the microcapsules were characterized by using thermogravimetric anal. (TGA). Addnl., the performance of the release inhibitor from microcapsules in the interface of the coating/substrate characterized by electrochem. impedance spectroscopy (EIS) measurement. Progress in Organic Coatings published new progress about Anticorrosive coating materials. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, HPLC of Formula: 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Yu, Tung-Hsi published the artcileIsolation and identification of volatile compounds of unbaked Oolong tea and baked Oolong tea using an acid/base fractionation method, Recommanded Product: 2-(2-Hydroxypropan-2-yl)-5-methylcyclohexanol, the main research area is volatile Oolong tea leaf baking.

The volatile compounds of unbaked Oolong tea and baked Oolong tea leaves were isolated using the instantaneous Likens-Nickerson steam distillation/dichloromethane extraction method. The flavor isolates were fractionated using acid-base fractionation methods. After being concentrated, the volatile compounds in each fraction were determined by gas chromatog.-mass spectrometry (GC-MS). Around 200 volatile compounds were identified from Oolong tea samples. Baking significantly increased the compounds, which were likely generated from Maillard reactions. These compounds included pyrazines and some nitrogen-containing compounds

Food Science and Agricultural Chemistry published new progress about Aldehydes Role: BSU (Biological Study, Unclassified), PUR (Purification or Recovery), BIOL (Biological Study), PREP (Preparation). 42822-86-6 belongs to class alcohols-buliding-blocks, name is 2-(2-Hydroxypropan-2-yl)-5-methylcyclohexanol, and the molecular formula is C10H20O2, Recommanded Product: 2-(2-Hydroxypropan-2-yl)-5-methylcyclohexanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Filannino, Pasquale published the artcileVolatilome and bioaccessible phenolics profiles in lab-scale fermented bee pollen, Formula: C5H12O, the main research area is fermented bee pollen volatilome bioaccessible phenolics; fermentation; flavonoids; lactic acid bacteria; phenolics; pollen; volatile compounds.

Bee-collected pollen (BCP) is currently receiving increasing attention as a dietary supplement for humans. In order to increase the accessibility of nutrients for intestinal absorption, several biotechnol. solutions have been proposed for BCP processing, with fermentation as one of the most attractive. The present study used an integrated metabolomic approach to investigate how the use of starter cultures may affect the volatilome and the profile of bioaccessible phenolics of fermented BCP. BCP fermented with selected microbial starters (Started-BCP) was compared to spontaneously fermented BCP (Unstarted-BCP) and to unprocessed raw BCP (Raw-BCP). Fermentation significantly increased the amount of volatile compounds (VOC) in both Unstarted- and Started-BCP, as well as modifying the relative proportions among the chem. groups. Volatile free fatty acids were the predominant VOC in Unstarted-BCP. Started-BCP was differentiated by the highest levels of esters and alcs., although volatile free fatty acids were always prevailing. The profile of the VOC was dependent on the type of fermentation, which was attributable to the selected Apilactobacillus kunkeei and Hanseniaspora uvarum strains used as starters, or to the variety of yeasts and bacteria naturally associated to the BCP. Started-BCP and, to a lesser extent, Unstarted-BCP resulted in increased bioaccessible phenolics, which included microbial derivatives of phenolic acids metabolism

Foods published new progress about Aldehydes Role: BSU (Biological Study, Unclassified), PUR (Purification or Recovery), BIOL (Biological Study), PREP (Preparation). 584-02-1 belongs to class alcohols-buliding-blocks, name is 3-Pentanol, and the molecular formula is C5H12O, Formula: C5H12O.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Vicosa, Alessandra L. published the artcileBioequivalence studies and sugar-based excipients effects on the properties of new generic ketoconazole tablets formulations and stability evaluation by using direct compression method, Safety of (3R,4R,5R)-6-(((2S,3R,4S,5S,6R)-3,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexane-1,2,3,4,5-pentaol, the main research area is sugar polyol excipient disintegrant ketoconazole tablet bioequivalence dissolution stability.

In this work we described the development of a new solid oral formulation of ketoconazole, a broad-spectrum antifungal agent that belongs to the class II of Biopharmaceutics Classification System (BCS). The ketoconazole raw material supplier was selected to present a best flow and compaction. In addition we used direct compression and superdisintegrants associated to polyols to enhance the dissolution of the ketoconazole tablets. The dissolution was evaluated based in level C in vivo/in vitro correlation established. The best formulation was obtained with croscarmellose/maltose association that in the accelerated stability assays presented no differences on quality specifications and no drug-excipients interaction by DSC analyses. In this work it was possible to confirm the use of sugar-based excipients as suitable dissolution enhancers in pharmaceutical technol. and real processes conditions.

Pharmaceutical Development and Technology published new progress about Dissolution (enhancers). 64519-82-0 belongs to class alcohols-buliding-blocks, name is (3R,4R,5R)-6-(((2S,3R,4S,5S,6R)-3,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexane-1,2,3,4,5-pentaol, and the molecular formula is C12H24O11, Safety of (3R,4R,5R)-6-(((2S,3R,4S,5S,6R)-3,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexane-1,2,3,4,5-pentaol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Archana published the artcilePhysicochemical characterization and evaluation of disintegrating property of Lepidium sativum seed mucilage, Computed Properties of 64519-82-0, the main research area is Lepidium seed mucilage disintegration tablet metformin hydrochloride dissolution.

The present work was carried out to study the physicochem. characteristics and to explore the disintegration property of the mucilage extracted from the seeds of Lepidium sativum by formulating orally disintegrating tablets of Metformin HCl by the direct compression method. Mucilage extracted from the seeds was subjected to preformulation studies for its suitability as a disintegrating agent. The mucilage extracted was evaluated for various parameters as per Indian Pharmacopoeia 1996. Several formulations with different proportions of mucilage were prepared and evaluated for phys. parameters such as thickness, hardness, friability, weight variation, drug content, disintegration time and drug dissolution The study revealed that Lepidium sativum seed mucilage (Ls M) is a good pharmaceutical adjuvant and is effective as a disintegrant at low concentration as 2.5%.

Journal of Pharmacy Research published new progress about Compressibility. 64519-82-0 belongs to class alcohols-buliding-blocks, name is (3R,4R,5R)-6-(((2S,3R,4S,5S,6R)-3,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexane-1,2,3,4,5-pentaol, and the molecular formula is C12H24O11, Computed Properties of 64519-82-0.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Li, Yiming published the artcileSelective Late-Stage Oxygenation of Sulfides with Ground-State Oxygen by Uranyl Photocatalysis, COA of Formula: C4H10OS, the main research area is photooxidation catalyst uranyl sulfide sulfoxide sulfone; oxygen; oxygenation; photocatalysis; sulfides; uranyl catalysis.

Oxygenation is a fundamental transformation in synthesis. Herein, we describe the selective late-stage oxygenation of sulfur-containing complex mols. with ground-state oxygen under ambient conditions. The high oxidation potential of the active uranyl cation (UO22+) enabled the efficient synthesis of sulfones. The ligand-to-metal charge transfer process (LMCT) from O 2p to U 5f within the O::U::O group, which generates a UV center and an oxygen radical, is assumed to be affected by the solvent and additives, and can be tuned to promote selective sulfoxidation This tunable strategy enabled the batch synthesis of 32 pharmaceuticals and analogs by late-stage oxygenation in an atom- and step-efficient manner.

Angewandte Chemie, International Edition published new progress about Cell proliferation. 505-10-2 belongs to class alcohols-buliding-blocks, name is 3-(Methylthio)propan-1-ol, and the molecular formula is C4H10OS, COA of Formula: C4H10OS.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts