Month: December 2022

Tian, Hongli published the artcileSulfated ordinary clay for acid-catalyzed conversion of biomass derivatives: Impacts of abundance and types of acidic sites on catalytic performance, COA of Formula: C7H12O3, the main research area is sulfated ordinary clay catalyst calcination furfuryl alc ethyl levulinate; physiochem property.

Ordinary clay is an abundantly available material for use as catalyst support. In this study, sulfuric acid was used as sulfonating agent to prepare sulfated clay-based super-acid catalyst. The effects of sulfuric acid concentration and calcination temperature on physiochem. properties, interaction of sulfur species with the oxides in clay, distribution of Bronsted acid sites and Lewis acid sites were characterized with XRD, pore structure anal., FT-IR, elemental anal., NH3-temperature programmed desorption (NH3-TPD) and Pyridine-DRIFTS etc. The catalytic performance of different catalysts was evaluated by conversion of furfuryl alc. (FA) to Et levulinate (EL). The results showed that sulfuric acid reacted with alumina in clay to form Al2(SO4)3, thus changing structure and crystal phase of the catalyst. Increasing calcination temperature enhanced the interaction between sulfate species and clay, the retaining of sulfur on clay surface and the formation of more Bronsted acid sites while less Lewis acid sites. In addition, balanced distribution of the acidic sites was crucial for selective conversion of FA to EL. Over the clay catalyst impregnated with 4 M H2SO4 and calcined at 300°C, the yield of EL could reach 90%. The catalyst was not stable in polar solvent like ethanol due to leaching of sulfur species, while in aprotic solvent like DMSO, the catalyst maintained a good catalytic stability.

Journal of Solid State Chemistry published new progress about Bronsted acidity. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, COA of Formula: C7H12O3.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Ariba, Houda published the artcilePhysicochemical Properties for the Reaction Systems: Levulinic Acid, Its Esters, and γ-Valerolactone, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is physicochem property reaction system levulinate ester valerolactone.

The use of biomass, particularly, a second-generation one, as a renewable raw material is crucial to sustain the chem. industry. To favor the development of such processes, one needs to make a cost evaluation, which requires the knowledge of process thermodn. and kinetics. In this paper, measurements of different physicochem. properties (viscosity, d., refractive index, and sp. heat capacity) were done for the systems: hydrogenation of levulinic acid or its esters to γ-valerolactone. From those physicochem. measurements, it was possible to extract the ones of the intermediates and perform a thermodn. model assessment by using Aspen Plus. The Redlich-Kwong-Soave cubic equation of state and Benedict-Webb-Rubin-Starling virial equation of state are suitable to describe these chem. systems.

Journal of Chemical & Engineering Data published new progress about Biomass refining. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Recommanded Product: Ethyl 4-oxopentanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Cabanes, A. published the artcileNew methods to remove volatile organic compounds from post-consumer plastic waste, Recommanded Product: Benzyl acetate, the main research area is volatile organic compound plastic waste hot air stripping extraction; Contaminant; Deodorization; NIA; Odor; Polyethylene; Smell.

While the annual European demand for polyolefins is 25 million tonnes, only 3 million tonnes of recycled polyolefins find their place in the market, despite collecting 15 million tonnes of post-consumer polyolefins every year. Brand owners of care products are showing their interest in using post-consumer recycled plastics for their packaging. However, there is a general concern in using these materials, as recycled polymers can contain unwanted substances that may expose the consumer to health risks or make the packaging unattractive. Accordingly, the presence of these contaminants narrows the market opportunity of recycled plastics to applications with low-quality requirements and in which the product is not in direct contact with the consumer. Though mech. recycling is the most widespread solution presents limitations in terms of decontamination, as only superficial substances are removed. Thereby, the volatile organic compounds (VOCs) migrated to the polymer matrix remain inside. Consequently, there is a need to find a solution to purify recycled plastics and increase their market share. This study focuses on removing VOCs from post-consumer recycled HDPE through two innovative methods applied for the first time in this field, steam stripping and polyethylene glycol (PEG) extraction The methodol. implemented to analyze the volatile organic compounds in HDPE was HS-SPME-GC/MS. Both methods showed a decrease above 70% in the VOCs content compared to extrusion-degassing. Moreover, these were compared to hot air stripping, a new technol. developed at an industrial scale for the removal of VOCs. As a result, steam stripping improved efficiency in reducing the overall VOCs compared to hot air stripping. The PEG extraction method lowered the volatile polar compounds further than using hot air stripping. Addnl., none of these technologies modified the HDPE melting flow index.

Science of the Total Environment published new progress about Biodegradability. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Recommanded Product: Benzyl acetate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Cabanes, A. published the artcileNew methods to remove volatile organic compounds from post-consumer plastic waste, Recommanded Product: Hexyl 2-hydroxybenzoate, the main research area is volatile organic compound plastic waste hot air stripping extraction; Contaminant; Deodorization; NIA; Odor; Polyethylene; Smell.

While the annual European demand for polyolefins is 25 million tonnes, only 3 million tonnes of recycled polyolefins find their place in the market, despite collecting 15 million tonnes of post-consumer polyolefins every year. Brand owners of care products are showing their interest in using post-consumer recycled plastics for their packaging. However, there is a general concern in using these materials, as recycled polymers can contain unwanted substances that may expose the consumer to health risks or make the packaging unattractive. Accordingly, the presence of these contaminants narrows the market opportunity of recycled plastics to applications with low-quality requirements and in which the product is not in direct contact with the consumer. Though mech. recycling is the most widespread solution presents limitations in terms of decontamination, as only superficial substances are removed. Thereby, the volatile organic compounds (VOCs) migrated to the polymer matrix remain inside. Consequently, there is a need to find a solution to purify recycled plastics and increase their market share. This study focuses on removing VOCs from post-consumer recycled HDPE through two innovative methods applied for the first time in this field, steam stripping and polyethylene glycol (PEG) extraction The methodol. implemented to analyze the volatile organic compounds in HDPE was HS-SPME-GC/MS. Both methods showed a decrease above 70% in the VOCs content compared to extrusion-degassing. Moreover, these were compared to hot air stripping, a new technol. developed at an industrial scale for the removal of VOCs. As a result, steam stripping improved efficiency in reducing the overall VOCs compared to hot air stripping. The PEG extraction method lowered the volatile polar compounds further than using hot air stripping. Addnl., none of these technologies modified the HDPE melting flow index.

Science of the Total Environment published new progress about Biodegradability. 6259-76-3 belongs to class esters-buliding-blocks, name is Hexyl 2-hydroxybenzoate, and the molecular formula is C13H18O3, Recommanded Product: Hexyl 2-hydroxybenzoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Xie, Min published the artcileNatural wax from non-medicinal aerial part of Codonopsis pilosula as a biolubricant, Category: esters-buliding-blocks, the main research area is natural wax biolubricant thermal stability lubricity Codonopsis.

To solve the problems of unsustainability and low biodegradability of mineral oil-based lubricants, an agro-waste to biolubricant supply chain was proposed. A plant wax was extracted from the non-medicinal part of Codonopsis pilosula, and its composition, thermal stability, and lubrication behaviors were investigated. The plant wax was composed mainly of the esters of fatty acids and triterpenes. The natural wax showed good thermal stability and lubricity over the wide temperature range of 25-150°C and load range of 100-250 N. These intriguing properties indicate that this plant wax can be used as a sustainable biolubricant in an open system or in food processing industry. This work simultaneously provides a strategy to realize the utilization of the abundant non-medicinal parts of medicinal herbs abandoned in China. The agro-waste to biolubricant supply chain conforms to the goal of cleaner production and tech. processes.

Journal of Cleaner Production published new progress about Biodegradability. 41114-00-5 belongs to class esters-buliding-blocks, name is Ethyl pentadecanoate, and the molecular formula is C17H34O2, Category: esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Lv, Xue published the artcileTailored Ionic Liquids Encapsulation Method Endowing Hydrogels with Excellent Mechanical and Catalytic Activity, Safety of Dodecyl 2-methylacrylate, the main research area is ionic liquid encapsulation hydrogel catalyst polymethacrylate nanoparticle; tensile ioniq liquid hydrogel dual network palladium reduction catalyst.

Ionic liquids (ILs) hydrogels as an appropriate candidate for the absorption of nanoparticles, had gained immense interests due to its friendly environment, low cost, high efficiency, and insensitivity to toxic substance. However, conventional ILs hydrogels usually suffered from easy brittle property and mech. defects. Herein, a novel entrapped pattern and structural transformation of ILs within copolymer of acrylamide/N, N dimethylaminoethyl methacrylate bromododecane hydrophobic monomers p(AM/DMLB) based hydrogels were prepared through changing the filling pattern of ILs to form toughened hydrophobic association hydrogels. After adding the ionic liquids latex sphere particles (ILs-LPs), both the ionically crosslinked network and hydrophobic association network were fabricated, which could effectively reconstruct the structure and dissipate energy. It was found that the p(AM/DMLB)/ILs-LPs hydrogels possessed high mech. properties, and the tensile strength, elongation and toughness reached 0.49 MPa, 2300% and 4.9 MJ/m3, resp. Without adding other additives and crosslinking agents, the hydrogel could act as the template for the in situ and stability of Pd nanoparticles. More importantly, the excellent biocompatibility, remoldability and fatigue resistance endowing the p(AM/DMLB)/ILs-LPs hydrogels/Pd with recycled and reused performances, which was possible to bestow samples with any desired shape and even served as catalysts for promising practical application. Therefore, the innovative design strategy for ionic liquids’ latex sphere particles as the sole joint-center of dual phys. crosslinked network, could be used to develop robust and stretchable hydrogel materials for catalytic use in the sewage disposal industry.

ACS Sustainable Chemistry & Engineering published new progress about Biocompatibility. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Safety of Dodecyl 2-methylacrylate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Wei, Zhiwei published the artcilePhotoenhanced Dual-Functional Nanomedicine for Promoting Wound Healing: Shifting Focus from Bacteria Eradication to Host Microenvironment Modulation, Application In Synthesis of 2044-85-1, the main research area is dual functional nanomedicine bacteria eradicationmicroenvironment modulation; chemo-photothermal disinfection; dual-functional nanomedicine; host microenvironment regulation; photoenhanced ROS scavenging activity; wound healing.

Pathogenic bacterial infection has become a serious medical threat to global public health. Once the skin has serious defects, bacterial invasion and the following chain reactions will be a thorny clin. conundrum, which takes a long time to heal. Although various strategies have been used to eradicate bacteria, the treatment which can simultaneously disinfect and regulate the infection-related host responses is rarely reported. Herein, inspired by the host microenvironment, a photoenhanced dual-functional nanomedicine is constructed (Hemin@Phmg-TA-MSN) for localized bacterial ablation and host microenvironment modulation. The “”NIR-triggered local microthermal therapy”” and pos. charged surface endow the nanomedicine with excellent bacterial capture and killing activities. Meanwhile, the nanomedicine exhibits broad-spectrum reactive oxygen species (ROS) scavenging activity via the synergistic effect of hemin and tannic acid with photoenhanced electron and hydrogen transfers. Furthermore, the in vivo experiments demonstrate that the dual-functional nanomedicine not only presents robust bacterial eradication capability, but also triggers the oxidative stress and inflammatory microenvironment regulation. The work not only shows a facile and effective way for infected wound management but also provides a new horizon for designing novel and efficient anti-infection therapy shifting focus from bacteria treatment to host microenvironment modulation.

ACS Applied Materials & Interfaces published new progress about Biocompatibility. 2044-85-1 belongs to class esters-buliding-blocks, name is 2′,7′-Dichloro-3-oxo-3H-spiro[isobenzofuran-1,9′-xanthene]-3′,6′-diyl diacetate, and the molecular formula is C24H14Cl2O7, Application In Synthesis of 2044-85-1.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Chen, Hao published the artcileUltra-stable tellurium-doped carbon quantum dots for cell protection and near-infrared photodynamic application, Computed Properties of 2044-85-1, the main research area is cervical cancer tellurium carbon quantum dot near IR photodynamic.

It is important to regulate the concentration of reactive oxygen species (ROS) in cells since they play important roles in metabolism Thus, developing nanoreagents to control the ROS is critical Herein, tellurium-doped carbon quantum dots (Te-CDs) were developed by a simple and efficient hydrothermal method, which can scavenge H2O2 to protect cells under ambient condition, but generate ·OH under 808 nm irradiation as photodynamic application. This contribution presented a kind of novel CDs with dual-functions, which can potentially regulate ROS under different conditions.

Science Bulletin published new progress about Biocompatibility. 2044-85-1 belongs to class esters-buliding-blocks, name is 2′,7′-Dichloro-3-oxo-3H-spiro[isobenzofuran-1,9′-xanthene]-3′,6′-diyl diacetate, and the molecular formula is C24H14Cl2O7, Computed Properties of 2044-85-1.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Hu, Binbin published the artcileActivatable smart nanoprobe for sensitive endogenous MMP2 detection and fluorescence imaging-guided phototherapies, Recommanded Product: 2′,7′-Dichloro-3-oxo-3H-spiro[isobenzofuran-1,9′-xanthene]-3′,6′-diyl diacetate, the main research area is activatable smart nanoprobe MMP2 fluorescence imaging guided phototherapy synergism.

A stimuli-activatable theranostic system enabling selective imaging and controlled phototherapies is highly essential for precise cancer diagnosis and treatment. Herein, we designed a smart theranostic nanoprobe that comprised a photosensitizer (PS), gold nanorods (AuNRs) and a matrix metalloproteinase 2 (MMP2)-responsive peptide linker. Apart from being applied for photodynamic therapy (PDT), PS has also been widely used for fluorescence imaging. Spatiotemporal control of the photoactivity of PS is of great importance for cancer theranostics. In the present work, due to the presence of Förster resonance energy transfer (FRET) between PS and AuNRs, the fluorescence and 1O2 production of PS were suppressed during the circulation, avoiding adverse damage to normal tissues; however, the nanoprobe could be activated for targeted imaging and selective PDT when the peptide linker was cleaved by overexpressed MMP2 in cancer cells. More importantly, the restored fluorescence could be successfully used to quant. detect MMP2 with a detection limit of 29 pM and to light up cancer cells, further guiding synergistically activated PDT/PTT (photothermal therapy) for highly efficient and special killing of cancer cells. This study can help design smart cancer-related biomarker-activatable theranostic probes for mol. sensing and site-specific cancer treatment.

Inorganic Chemistry Frontiers published new progress about Biocompatibility. 2044-85-1 belongs to class esters-buliding-blocks, name is 2′,7′-Dichloro-3-oxo-3H-spiro[isobenzofuran-1,9′-xanthene]-3′,6′-diyl diacetate, and the molecular formula is C24H14Cl2O7, Recommanded Product: 2′,7′-Dichloro-3-oxo-3H-spiro[isobenzofuran-1,9′-xanthene]-3′,6′-diyl diacetate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Saxena, Shaiphali published the artcileComparative GC-MS and FT-IR analysis of Portulaca oleracea L. and Portulaca quadrifida L. leaf extracts, Name: Methyl docosanoate, the main research area is Portulaca oleracea quadrifida leaf extract bioactive phytochem GCMS FTIR.

Quality assurance (QA) is an essential task in pharmacognostic field to promote the product standardization. The present study is focused upon phytoconstituent anal. of aqua-methanol leaf extracts of Portulaca oleracea L. and Portulaca quadrifida L. via GC-MS (gas chromatog.-mass spectrometry) and FT-IR (Fourier transform-IR) spectroscopy for formulation of quality medicines and other products. The GC-MS unveiled 72 and 86 bioactive compounds (both major and tracer) of several categories like terpenoids, phenols, steroids, flavonoids, fatty acids, nucleoside, vitamins, etc. The FT-IR chromatogram confirmed various functional groups peaks (cm-1) of amines (-NH2), alcs. (-OH), carboxylic acids (-COOH), ketones (C=O), etc. The present study provides a futuristic platform for researchers to pursue pharmaceutical and food safety assessments and a proper weed management plan.

Pharma Innovation published new progress about Bioactive agents. 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Name: Methyl docosanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics