Month: December 2022

Bakuru, Vasudeva Rao published the artcileExploring the Bronsted acidity of UiO-66 (Zr, Ce, Hf) metal-organic frameworks for efficient solketal synthesis from glycerol acetalization, Related Products of esters-buliding-blocks, the main research area is Bronsted acidity metal organic framework solketal catalyst glycerol acetalization; hafnium MOF catalyst levulinic acid acetalization; cerium MOF catalyst levulinic acid acetalization; zirconium MOF catalyst acetalization.

Zr, Ce, Hf-based isostructural UIO-66 MOFs exhibited varying degree of Bronsted acidity (UiO-66(Hf) > UiO-66(Ce) > UiO-66(Zr)) on their secondary building units owing to the differences in their oxophilicities. UIO-66(Hf) showed remarkable catalytic activity for solketal synthesis with a turnover frequency as high as 13 886 h-1, which is 90 times higher than that of UiO-66(Zr) and several orders of magnitude higher than that of H2SO4 or Zeolites.

Dalton Transactions published new progress about Acetalization. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Related Products of esters-buliding-blocks.

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

Picone, Marco published the artcileFragrance materials (FMs) affect the larval development of the copepod Acartia tonsa: An emerging issue for marine ecosystems, SDS of cas: 6259-76-3, the main research area is Acartia tonsa marine ecosystem fragrance material; Acartia tonsa; Copepods; Fragrance materials (FMs); Larval development.

Fragrance materials (FMs) are used in a variety of detergents and cosmetics, including household and personal care products. Despite their widespread use and the growing evidence of their occurrence in surface waters worldwide, very little is known about their toxicity towards marine species, including a key component of the marine food webs such as copepods. Thus, we investigated the toxicity of six of the more long-lasting and stable com. fragrances, including Amyl Salicylate (AMY), Oranger Crystals (ORA), Hexyl Salicylate (HEX), Ambrofix (AMB), Peonile (PEO), and Benzyl Salicylate (BZS), to assess their ability to impair the larval development of the calanoid copepod Acartia tonsa. FMs inhibited the development of A. tonsa significantly at concentrations by far lower than the effect-concentrations reported in the literature for aquatic species. The more toxic FMs were HEX (EC50 = 57 ng L-1), AMY (EC50 = 131 ng L-1) and ORA (EC50 = 766 ng L-1), while the other three compounds exerted toxic effects at concentrations higher than 1000 ng L-1 (LOEC at 1000 ng L-1-1 for PEO and BZS, and at 10,000 ng L-1 for AMB). Early life-stage mortality was unaffected by FMs at all the tested concentrations A comparison with water concentrations of FMs reported in the literature confirmed that FMs, especially HEX and AMY, may act as contaminants of potential concern in many aquatic habitats, including urban areas and remote and polar environments.

Ecotoxicology and Environmental Safety published new progress about Acartia tonsa. 6259-76-3 belongs to class esters-buliding-blocks, name is Hexyl 2-hydroxybenzoate, and the molecular formula is C13H18O3, SDS of cas: 6259-76-3.

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

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

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

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

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

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

Yang, Fu published the artcileFully catalytic upgrading synthesis of 5-Ethoxymethylfurfural from biomass-derived 5-Hydroxymethylfurfural over recyclable layered-niobium-molybdate solid acid, COA of Formula: C7H12O3, the main research area is niobium molybdate catalyst preparation morphol hydroxymethylfurfural etherification.

Biomass-derived resources exploited in depth toward the synthesis of high value-added chems. is very promising, but still limited by the applicable catalyst. In this paper, we report regulated robust multilayer-like polyoxometalates(niobium molybdate) specific to the catalytic synthesis of promising 5-ethoxymethylfurfural (EMF). The present solid acid catalysts resulted from precisely-tuned compositions of Nb and Mo toward acquiring controlled bronsted acid amounts and interlayer space coupling with specific lewis acid sites are demonstrated to be the determining factors for tuning conversion and selectivity in the synthesis of EMF, resp. The characterization results indicate that the increment in Nb moiety is beneficial to produce more accessible acid sites and the enlarged interlayer space in the catalyst, thereby promoting the acid-catalyzed conversion. As a result, the full conversion(conv. 100%) of 5-hydroxymethylfurfural into the 5-ethoxymethylfurfural (select. >99%) by etherification with ethanol within only 60 min was realized as the record-high yield under the solvent-free condition, far outperforming several traditional catalysts. In addition, the rational 67% yield of EMF was received when using fructose as an initial reactant. Ulteriorly, the resultant catalyst inherits the superior catalytic activity in the substrate expansion experiments in the presence of different alcs. More importantly, the resulted catalyst shows durable catalytic activity without any activity-loss during the eight recycling, which reveals the huge potential industrial application prospect.

Applied Catalysis, B: Environmental 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, COA of Formula: C7H12O3.

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

Zhang, Luxin published the artcileSulfonic acid-functionalized PCP(Cr) catalysts with Cr3+ and -SO3H sites for 5-ethoxymethylfurfural production from glucose, Name: Ethyl 4-oxopentanoate, the main research area is porous coordination polymer catalyst ethoxymethylfurfural glucose.

5-Ethoxymethylfurfural (EMF) has been identified as a potential biofuel and fuel additive, for which the production from glucose (the most abundant and inexpensive monosaccharide) in a one-step process would be highly desirable. Here, the synthesis of sulfonic acid-functionalized porous coordination polymers (PCPs) and their application as catalysts for EMF synthesis are reported. PCP(Cr)-BA (PCP material with Cr3+ ions and H2BDC-SO3H linkers) and PCP(Cr)-NA (PCP material with Cr3+ ions and H2NDC(SO3H)2 linkers) materials containing both Cr3+ sites and Bronsted-acidic -SO3H sites were prepared The morphol., pore structure, acidity, chem. composition, and thermal stability of the two functionalized PCP(Cr) catalysts were analyzed by systematic characterization. The catalysts featured a porous morphol. and dual Cr3+ and -SO3H sites, which enabled the cascade conversion of glucose to EMF. PCP(Cr)-BA exhibited higher performance than PCP(Cr)-NA with an EMF yield of 23.1% in the conversion of glucose at 140° after 22 h in an ethanol/water system. In addition, the as-prepared catalyst exhibited a high stability in the current catalytic system for EMF production from glucose with a constant catalytic activity in a four-run recycling test without an intermediate regeneration step.

RSC Advances 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, Name: Ethyl 4-oxopentanoate.

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