Category: esters-buliding-blocks

Kumari, P. Krishna published the artcileTungstophosphoric acid supported on mesoporouus niobiumoxophosphate: an efficient solid acid catalyst for etherification of 5-hydroxymethylfurfural to 5-ethoxymethylfurfural, Synthetic Route of 539-88-8, the main research area is tungstophosphoric acid supported mesoporouus niobiumoxophosphate solid acid catalyst etherification; hydroxymethylfurfural ethoxymethylfurfural catalyst niobiumoxophosphate etherification.

Tungstophosphoric (TPA) supported on mesoporouus niobiumoxophosphate (NbP) catalysts were prepared with different loadings. The synthesized materials employed as heterogeneous solid acid catalysts for selective etherification of 5-hydroxymethylfurfural to 5-ethoxymethylfurfural. Physico-chem. properties of the catalysts were obtained by different spectroscopic techniques and their results exposed that TPA was a highly dispersed state on NbP and acidity of the catalyst enhanced due to its dispersion. The higher catalytic performance can be allied to the total acidity of the catalysts with appropriate number of Bronsted-Lewis acid sites which were directed by the contact and dispersion of TPA on support. Different reaction parameters were premeditated and 25 wt% TPA/NbP catalyst exhibited highest catalytic activity with 95% of HMF conversion and 89% of EMF yield. The catalyst is reusable without noticeable turn down in catalytic performance up to five cycles. A kinetic model for etherification of HMF was also derived.

Catalysis Today published new progress about Etherification. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Synthetic Route of 539-88-8.

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

Sapozhnikova, Yelena published the artcileSuspect screening of chemicals in food packaging plastic film by comprehensive two-dimensional gas chromatography coupled to time-of-flight mass spectrometry, Name: Hexyl 2-hydroxybenzoate, the main research area is food packaging plastic film chem screening GC TOF MS.

In this study, chems. extracted from a food packaging plastic film with a series of organic solvents were tentatively identified with comprehensive two-dimensional gas chromatog. coupled to time-of-flight mass spectrometry (GC×GC-TOF-MS). A total of 91 compounds were tentatively identified in the film extracts, based on high mass spectral matching with the US National Institute of Standards and Technol. (NIST) mass spectral (MS) library. The tentatively identified chems. included common plasticizers: di(2-ethylhexyl) adipate (DEHA), di-Et and di-Bu phthalates; polymer and plastic additives: hexafluorobisphenol A (bisphenol AF), 2,4,7,9-tetramethyl-5-decyn-4,7-diol (TMDD), Me dehydroabietate, and 2,2,4-trimethyl-1,3-pentanediol diisobutyrate (TXIB); UV filters: homosalate, 2-ethyhexyl salicylate (octisalate); fragrances: cedrol and galaxolide, flavoring agents: n-hexyl salicylate and benzophenone. Addnl., representatives of polycyclic aromatic hydrocarbons (PAHs), alkylated naphthalenes, linear alkylbenzenes, and Ph, biphenyl, and di-Ph compounds were identified. Unexpected discovery of low chlorinated polychlorinated biphenyls (PCBs) in the film extracts suggests their source should be investigated further. The tentatively identified compounds were characterized based on use, source, chem. properties, and previously reported occurrences in plastic food packaging materials, food, or the environment.

LCGC North America published new progress about Food packaging. 6259-76-3 belongs to class esters-buliding-blocks, name is Hexyl 2-hydroxybenzoate, and the molecular formula is C13H18O3, Name: Hexyl 2-hydroxybenzoate.

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

Vemula, Madhu published the artcileIdentification of calcium carbide-ripened sapota (Achras sapota) fruit by headspace SPME-GC-MS, Application of Benzyl acetate, the main research area is Achras calcium carbide toluene fruit ripening SPME GC MS; Post-harvest ripening; artificial ripening; calcium carbide; ethylene; gas chromatography �mass spectrometry; sapodilla fruits; sapota fruits; solid-phase microextraction.

The effect of post-harvest ripening by ethylene and calcium carbide was studied by headspace solid-phase microextraction gas chromatog. mass spectrometry (HS-SPME-GC-MS) method. Sapota (sapodilla) fruits were ripened with ethylene gas, tech. grade calcium carbide and pure calcium carbide ripeners and the samples were homogenised after complete ripening. The samples were subjected to HS-SPME-GC-MS and the obtained results showed the presence of various alcs., aldehydes, acids, ketones and esters which were commonly present in the samples. The fruit samples ripened with tech. grade calcium carbide showed the presence of 3,5-dimethyl-1,2,4-trithiolane isomers, which can be used as markers to identify sapota fruits ripened with tech. grade calcium carbide. The tech. grade calcium carbide contains divinyl sulfide which might have been transformed into the trithiolane isomers. These isomers were not observed in the fruits ripened with pure calcium carbide and also with ethylene gas. Hence the formation of trithiolane residues may be attributed to the presence of divinyl sulfide impurity present in calcium carbide and its conversion due to the action of ethylene releasing enzymes present in the fruits.

Food Additives & Contaminants, Part A published new progress about Fruit ripening. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Application of Benzyl acetate.

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

Lu, Yunhao published the artcileFlavor volatiles evolution of Chinese horse bean-chili-paste during ripening, accessed by GCxGC-TOF/MS and GC-MS-olfactometry, Formula: C10H20O2, the main research area is horse bean chili paste flavor volatile ripening GCTOFMS olfactometry.

The evolution of volatile compounds during the ripening of Chinese horse bean-chili-paste (CHCP) was investigated in this study. GCxGC-TOF/MS allowed an identification of 748 volatiles in three CHCP samples, resp., ripened for 3 mo (M3), 12 mo (M12) and 24 mo (M24), and it showed that a longer ripening resulted in a richer diversity of the volatiles. In addition, M3 contained more aldehydes and organic acids in content and M12 had more alcs., ketones, and esters, while M24 was abundant in heterocyclics. A total of 69 among the 748 volatiles were discriminated as the key flavor compounds of CHCP by method of Fisher ratio together with odor activity value and flavor dilution, including 12 alcs., 9 aldehydes, 4 ketones, 5 organic acids, 16 esters, 4 phenols, 6 sulfur-containing compounds, and 13 heterocyclics. Further, principal component anal. suggested that some key aldehydes contributed the flavor of M3, while some key alcs., esters and heterocyclics existed in M12, and some key phenols and heterocyclics were in M24. Varying of the key flavor volatiles during CHCP ripening gave it different fragrance configurations. Results presented details for the volatile profiles of CHCP during the natural ripening period, beneficial to shorten fermentation time by functional microorganisms, and could enrich the desire flavors.

International Journal of Food Properties published new progress about Fruit ripening. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Formula: C10H20O2.

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

Wang, Xin-Yun published the artcileStudy on the volatile organic compounds and its correlation with water dynamics of bigeye tuna (Thunnus obesus) during cold storage, Related Products of esters-buliding-blocks, the main research area is Thunnus volatile organic compound water dynamics cold storage; ATP-related compounds; bigeye tuna (Thunnus obesus); gas chromatography/mass spectrometry (SPME-GC/MS); low-field nuclear magnetic resonance; volatile organic compounds; water dynamics.

Volatile organic compounds (VOCs) and water play a key role in evaluating the quality of aquatic products. Quality deterioration of aquatic products can produce some off-odor volatiles and can induce water content changes. However, no previous study has investigated a correlation between water dynamics and VOCs of bigeye tuna during cold storage. The changes in VOCs, water dynamics and quality attributes of bigeye tuna (Thunnus obesus) upon storage at 0°C and 4°C for 6 days were investigated. The results showed that the values of ATP, ADP (ADP), adenosine monophosphate (AMP), T21 (trapped water) and the relative value of T1 decreased (p< 0.05), while drip loss and histamine contents increased (p < 0.05), which indicated quality deterioration during cold storage. With haematoxylin and eosin (HE) staining, muscle tissue microstructure was observed VOCs such as hexanal, heptanal, 4-Heptenal, (Z)-, pentadecanal-, 1-pentanol, 1-hexanol significantly increased, which sharply increased the content of off-odor volatiles. T21 was pos. correlated with 1-octen-3-ol, 1-penten-3-ol, while T21 was neg. correlated with hexanal, 1-hexanol. Therefore, good correlations between water dynamics and some VOCs were detected during quality deterioration of bigeye tuna throughout cold storage. Molecules published new progress about Microstructure. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Related Products of esters-buliding-blocks.

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

R., Malarvizhi published the artcileMacrotyloma uniflorum a plant food alleviates the metabolic syndrome through modulation of adipokines and PPARs, Synthetic Route of 929-77-1, the main research area is Macrotyloma plant food metabolic syndrome adipokines PPAR; AMPK; M. uniflorum; PPAR; brown fat; metabolic syndrome.

Macrotyloma uniflorum a lesser known legume is highly nutritious and notable for its ethano-medicinal potential. Herein, influence of M. uniflorum in high-fat dietinduced metabolic changes in rodent model of metabolic syndrome was evaluated. Serum levels of glucose, total cholesterol, triglycerides, VLDL-c, and bodyweight were decreased, whereas HDL-c was increased in M. uniflorum-treated MS rats. The protein expression (AMPK-α, PPAR-α, and PPAR-γ) and gene expression (leptin, adiponectin, resistin, UCP2, NF-κB, and IL-6) results are impressive to highlight that M. uniflorum modulates pathol. conditions of MS and proves to be cardioprotective. The HPLC and GC (MS) profiling reveals presence of array of polyphenols such as rutin (694.61 μg/g), catechin (500.12 μg/g), epicatechin (158.10 μg/g), gallic acid (17.98 μg/g), ferulic acid (10.911 μg/g), daidzein (6.51 μg/g), and PUFA, resp., which probably exhibits therapeutic effect on MS and associated complications by modulating lipid metabolism and adipogenesis. This study scientifically validated phytochems. in M. uniflorum for its functional potential in management of Metabolic Syndrome (MS). This study help nutraceutical industries to develop functional foods using M. uniflorum seeds to make porridges and soups or nutraceutical supplements with bioflavonoids isolated from M. uniflorum for management of metabolic disorders by mitigating hyperlipidemia, oxidative stress, and inflammation.

Journal of Food Biochemistry published new progress about Abdomen (fat). 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Synthetic Route of 929-77-1.

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

Zheng, Xiong published the artcileExperimental Studies of Thermal Conductivity of Three Biodiesel Compounds: Methyl Pentanoate, Methyl Octanoate, and Methyl Decanoate, SDS of cas: 110-42-9, the main research area is thermal conductivity biodiesel compound methyl pentanoate octanoate decanoate.

Biodiesels are mainly composed of fatty acid Me esters (FAMEs). Before using them for industrial applications, it is essential to study the thermophys. properties of FAMEs. Thermal conductivity of fuels is required in many processes, such as design of heat exchangers and biodiesel combustion modeling. Thus, it is of great significance to acquire accurate exptl. data for obtaining accurate thermal conductivity data of FAMEs. In this work, thermal conductivities of Me pentanoate (MeC5:0), Me octanoate (MeC8:0), and Me decanoate (MeC10:0) were measured using a transient hot-wire setup in a wide temperature and pressure range. The measured temperature and pressure regions are from 293.15 to 523.15 K and 0.1 to 15 MPa, resp. The exptl. data were fitted into a dimensionless polynomial. Absolute average deviations and maximum deviations are 0.33 and 1.40% for MeC5:0, 0.25 and 0.86% for MeC8:0, and 0.25 and 1.05% for MeC10:0, resp. Comparisons between this work and literature were carried out, and a good agreement was found between our data and literature data. Furthermore, three predictive models were used to describe the present data.

Journal of Chemical & Engineering Data published new progress about Biodiesel fuel. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, SDS of cas: 110-42-9.

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

Fan, Jing published the artcileExperimental research on the liquid thermal conductivity of mixtures of methyl caprate and ethyl caprate with n-undecane and n-tridecane, Synthetic Route of 110-42-9, the main research area is liquid thermal conductivity methyl ethyl caprate undecane tridecane.

Globally, biofuel is considered as the largest renewable energy source to substitute the petrochem. fuel and it is thus received a great amount of attention from both developed countries and developing countries. Among all the biofuels, biodiesel is strongly recommended as a promising alternative fuel for traditional internal combustion engines. Thermal conductivity is an essential transport property of fuel, and is vital in the flow and heat transfer process. Therefore, it is necessary to conduct the research associated with fuel’s thermal conductivity In this work, four binary fuel mixtures containing biodiesel components Me caprate and Et caprate with n-undecane and n-tridecane were prepared resp., and the liquid thermal conductivity of which were measured by the transient hot wire method system. The measurement was conducted at the temperature from 292 K to 362 K at atm. pressure. The exptl. data reported here have an uncertainty of less than 2%. In addition, a correlation about the relationship between the liquid thermal conductivity with temperature and the esters’ concentration in different fuel blends has been correlated.

Journal of Molecular Liquids published new progress about Biodiesel fuel. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Synthetic Route of 110-42-9.

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

Shen, Hao published the artcileOriented immobilization of enzyme-DNA conjugates on magnetic Janus particles for constructing a multicompartment multienzyme system with high activity and stability, HPLC of Formula: 2044-85-1, the main research area is immobilization enzyme DNA magnetic Janus particle.

Various organelles (e.g., mitochondria and chloroplasts) have a multicompartment structure, providing superior function of material transformation, selective segregation and energy conversion. Enlightened by the elegant evolution of nature, intended isolation of the biochem. process by cooperative multicompartments in cells has become an appealing blueprint to construct bioreactors. In this study, we develop a “”soft separation”” way to establish a delicate multicompartment multienzyme system (MMS) with polyphenol-encapsulated enzyme-DNA conjugates, which are anchored on magnetic Janus particles, providing a biomimetic catalysis network with the model cascade reactions in confinement. The well-designed MMS exhibits preferable bioactivity benefitting from the dependable DNA bridges and the oriented immobilization of enzymes, while the polyphenol shell further protects the anchored enzymes from exterior attacks, such as heat and enzymic degradation Moreover, by applying the MMS as nanomotors, the asym. distribution of enzymes on Janus particles is found to improve mutual elevation between the self-driven locomotion and enzyme-mediated reactions, delivering enhanced dispersal ability and bioactivity. Owing to the excellent enzymic activity, promoted stability and satisfying biocompatibility, the assembled MMS is proved to be promising for the in vitro and intracellular sensing of glucose, showing significant potential for biochem. anal. applications.

Journal of Materials Chemistry B: Materials for Biology and Medicine published new progress about Blood analysis. 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, HPLC of Formula: 2044-85-1.

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

Hwang, D. I. published the artcileWound healing related biological activities and chemical composition of absolute from Hemistepta lyrata bunge flower, HPLC of Formula: 929-77-1, the main research area is Hemistepta flower wound healing absolute chem composition.

The Hemistepta lyrata Bunge flower has various biol. and pharmacol. effects, but effects of its absolute on skin regeneration or wound healing-linked responses remain unknown. In the present study, effects of Hemistepta lyrata Bunge flower absolute were explored on the proliferation and migration of normal human keratinocytes as well as the composition of absolute from Hemistepta lyrata Bunge flower was analyzed using gas chromatog.-mass spectrometry. Hemistepta lyrata Bunge flower absolute stimulated both proliferation and migration of the keratinocytes. It also enhanced the phosphorylation of extracellular signal-regulated kinase 1/2 and serine/threonine-specific protein kinase in human keratinocytes. Moreover, the Hemistepta lyrata Bunge flower absolute increased the sprout outgrowth of human keratinocytes. Gas chromatog.-mass spectrometry anal. of Hemistepta lyrata Bunge flower absolute allowed identification of 16 compounds These findings indicated that the absolute promoted the migration and proliferation of keratinocytes. Therefore, Hemistepta lyrata Bunge flower absolute might play a beneficial role in skin regeneration or wound healing by elevating migration and proliferation of keratinocytes.

Indian Journal of Pharmaceutical Sciences published new progress about Cell migration. 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, HPLC of Formula: 929-77-1.

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