Esters-buliding-blocks

Zhang, Man published the artcileEffects of inoculation protocols on aroma profiles and quality of plum wine in mixed culture fermentation of Metschnikowia pulcherrima with Saccharomyces cerevisiae, Formula: C17H34O2, the main research area is Metschnikowia Saccharomyces mixed culture fermentation plum wine aroma quality.

This study describes the first report of application of Metschnikowia pulcherrima combined with Saccharomyces cerevisiae to ferment plum wine. Variable factors studied include inoculum ratio (M. pulcherrima: S. cerevisiae = 10:1, 1:1, and 1:10), as well as simultaneous vs. sequential inoculation, with tested trials spanning 10:1sim, 1:1sim, 1:10sim, 10:1seq, 1:1seq, and 1:10seq, resp. The yeast growth kinetics, physicochem. characteristics, organic acids, aroma profiles, and sensory evaluation were investigated. During fermentation, M. pulcherrima growth was inhibited by S. cerevisiae. Compared to each simultaneous analog, sequential fermentation which was inoculated with the same yeast ratio consumed less sugar and produced lower ethanol content. Organic acids in each sample varied with the use of different inoculation strategies. A total of 48 aroma compounds were quantified, and 1:1seq sample was observed to be abundant in esters and terpenes but relatively low in higher alcs., fatty acids, and phenols. Sensory evaluation of the variously-prepared samples revealed that 1:1seq sample featured a highly intense ‘global aroma’, ‘fruity’, and ‘alc.’ notes. PCA illustrated that different inoculation protocols of mixed culture fermentation influenced plum wine aroma except 1:10sim. Ultimately, 1:1seq was identified as a promising candidate for production of high-quality plum wine.

LWT–Food Science and Technology published new progress about Acidity. 41114-00-5 belongs to class esters-buliding-blocks, name is Ethyl pentadecanoate, and the molecular formula is C17H34O2, Formula: C17H34O2.

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

Zhang, Luxin published the artcileDirect production of ethyl levulinate from carbohydrates and biomass waste catalyzed by modified porous silica with multiple acid sites, Product Details of C7H12O3, the main research area is silica solid acid catalyst biomass precursor ethyl levulinate production.

Three modified porous silica solid acid catalysts with multiple acid sites (SO3H-Al/Silica, SO3H-Al-Zr/Silica, and SO3H-Zr/Silica) were prepared and characterized. The Pyridine-IR spectra showed that both Bronsted (B) and Lewis (L) acid sites were present in all three catalysts. Catalytic acid sites with different acid strengths were also found, including strong sulfonic acids and several weak acids. The prepared solid acid catalysts were used to catalyze the ethanolysis of glucose, glucosyl-based carbohydrates, and starchy food waste to produce Et levulinate (EL). The formation of EL was promoted by the synergistic effect between multiple acid sites on the catalysts. A higher B/L ratio and -SO3H amount promoted the production of EL. The catalytic activity was pos. correlated to the sp. surface area of the catalysts. Promising results were obtained for SO3H-Al/Silica: the maximum EL yield from glucose was 47.9%, and a small amount of 5-ethoxymethylfurfural was detected as a byproduct. Cellobiose, cellulose, expired wheat flour, and kitchen waste were also used as raw materials to produce EL, affording EL yields in the range of 1.6-38.9%. Finally, the stability of the prepared catalysts was explored after reuse and hot filtration.

Process Biochemistry (Oxford, United Kingdom) published new progress about Acidity. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Product Details of C7H12O3.

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

Zhang, Shuai published the artcileConversion of biomass-derived levulinate esters to γ-valerolactone with a robust CuNi bimetallic catalyst, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is levulinate ester valerolactone preparation bimetallic catalyst optimization study property.

A high-performance Cu-Ni bimetallic catalyst supported on Zr-Al oxides was fabricated for catalyzing the transfer hydrogenation of levulinate esters to γ-valerolactone (GVL) under mild conditions. The Cu2Ni1/Zr3Al7Oz catalyst provided the highest Et levulinate conversion of 99% with 96.8% GVL yield at 150°C in 8 h employing 2-Bu alc. (2-BuOH) as the hydrogen source. The catalyst was also used successfully for the catalytic transfer hydrogenation (CTH) of a series of levulinate esters. Moreover, the catalyst still retained high activity after recycling for 4 times. The outstanding catalytic performance and selectivity of Cu2Ni1/Zr3Al7Oz, together with its low-cost nature, make it have great application potential as a catalyst for the fabrication of GVL on a large scale in industry.

New Journal of Chemistry published new progress about Acidity. 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

Oh, Shinyoung published the artcilePretreatment of bio-oil with ion exchange resin to improve fuel quality and reduce char during hydrodeoxygenation upgrading with Pt/C, Product Details of C7H12O3, the main research area is bio oil ion exchange resin pretreatment hydrodeoxygenation fuel quality; Bio-oil; Pt/C catalyst; hydrodeoxygenation; ion-exchange resin; solid acid catalyst.

To obtain high-quality biofuel, bio-oil obtained from fast pyrolysis of woody biomass was pretreated with ion exchange resin (amberlyst 36) at 50°C, 100°C, and 150°C, and then the recovered liquid product was upgraded using hydrodeoxygenation (HDO) with Pt/C at 300°C. After the two-stage upgrading, 4 types of products (gas, light oil, heavy oil, and char) were obtained. Two-immiscible liquid products were consisted of organic heavy oil, derived from bio-oil, and aqueous light oil, based on the ethanol. The mass balances of the HDO products were influenced by the pretreatment temperature Ion exchange pretreatment of bio-oil was effective in reducing the char formation during the hydrodeoxygenation (HDO) process. The pretreatment also improved the following heavy oil properties: the water content, heating value, viscosity, acidity, and oxygen level. As a parameter used to indicate the biofuel acidity, the total acid number (TAN) value, was clearly reduced from 114.5 (bio-oil) to 34.1-78.2 (heavy oils). Furthermore, the water and oxygen contents of bio-oil (21.1 and 52.6 wt%, resp.) declined after the pretreatment followed by HDO (ranged 5.1-6.9 and 19.0-25.5 wt%, resp.), thereby improving its higher heating value (HHV) from 17.2 MJ/kg (bio-oil) to 26.2-28.1 MJ/kg (heavy oils). The degree of deoxygenation (DOD) increased as the pretreatment temperature decreased, and the highest energy efficiency (79.8%) was observed after pretreatment at 100°C. In terms of catalyst deactivation during the reaction, both carbon deposition and surface cracking intensified with increasing pretreatment temperatures

Environmental Technology published new progress about Acidity. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Product Details of C7H12O3.

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

Jamil, A. R. Md. published the artcileHigh-silica Hβ zeolite catalyzed methanolysis of triglycerides to form fatty acid methyl esters (FAMEs), Computed Properties of 111-11-5, the main research area is Hbeta zeolite triglyceride methanolysis fatty acid methyl ester.

Transesterification of biomass-derived triglycerides with methanol (methanolysis of triglycerides) is a promising method for the industrial production of the biodiesel fuel, fatty acid Me esters (FAMEs). Herein, we present a simple heterogeneous catalytic method for the selective transformation of triglycerides into FAMEs. For the methanolysis of trilaurin under reflux of methanol, a com. available high-silica Hβ zeolite (Hβ-75, Si/Al = 75) showed a higher yield of Me laurate than other zeolite catalysts, metal oxides, and conventional heterogeneous and homogeneous catalysts. Under the optimized conditions, the method was widely applicable to the transformation of various triglycerides (C4-C18 frames) into the corresponding FAMEs (yields of 87-93%). The catalyst was furthermore reusable. Quant. relationships between acidity, hydrophobicity, and reaction rates vs. Si/Al ratio of Hβ zeolite catalysts show that a low affinity to glycerol, which arises from the hydrophobicity of the high-silica zeolites, is an important factor for controlling the catalytic activity.

Fuel Processing Technology published new progress about Acidity. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Computed Properties of 111-11-5.

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

Shin, Mi published the artcileEtherification of biomass-derived furanyl alcohols with aliphatic alcohols over silica-supported nickel phosphide catalysts: Effect of surplus P species on the acidity, Application of Ethyl 4-oxopentanoate, the main research area is etherification biomass furanyl alc aliphatic silica nickel phosphide catalyst.

The acidity of nickel phosphide (Ni2P) catalysts plays a crucial role in producing a desired hydrodeoxygenation mol. from biomass-derived substrates; yet, it has never been explored in acid-catalyzed reactions. Herein, we demonstrated the activity of silica-supported Ni2P catalyst prepared with the nominal P/Ni ratio of 2 (Ni2P/SiO2-2P) in the etherification of furanyl alcs. (particularly, 5-(hydroxymethyl)furfural) with aliphatic alcs. including ethanol. By comparing the characteristics of Ni/SiO2, PxOy/SiO2, and Ni2P/SiO2-xP (x = 0.5 and 1), Ni2P/SiO2-2P was revealed to contain the Bronsted and Lewis acid sites of which both contributed to the etherification reaction. Notably, the Bronsted acidity was associated with the surplus P species added to produce the Ni2P phase. Consequently, supported Ni2P catalysts can work in acid-catalyzed reactions if an adequate ratio of Bronsted to Lewis acid sites is provided by the amount of the surplus P species determined by adjusting the P/Ni ratio.

Applied Catalysis, A: General published new progress about Acidity. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Application of Ethyl 4-oxopentanoate.

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

Gupta, Dinesh published the artcileTopotactic transformation of homogeneous phosphotungastomolybdic acid materials to heterogeneous solid acid catalyst for carbohydrate conversion to alkyl methylfurfural and alkyl levulinate, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is phosphotungastomolybdic acid carbohydrate catalytic dehydration etherication.

The strong interaction of higher transition metal oxides with inorganic non-metals can be promising for generating highly acidic three-dimensional materials by design. A comprehensive controlled acidity of heteropolyacid-like catalyst and interpretation of the microstructure and mechanism of the formation of a versatile heterogeneous solid acid catalyst, HPW4Mo10Ox has been heterogenized by biomass-derived cystine as organic linkers to control the acidity of as-synthesized materials, which have greater acidity and complexity in separation from the reaction mixture The new and unique results obtained in catalysis done in biphasic reaction. Cystine binds to the surface of HPW4Mo10Ox, and the topotactic transition occurred, change the morphol. and lattice parameter. We described here a sustainable transformation of highly acidic (0.84 mmol g-1) heteropoly acid (HPW4Mo10Ox) to cystine anchored on the active surface of the heteropoly acid and controlled the acidity (0.63 mmol g-1) and heterogenized the materials. As synthesized materials have been showing that for the direct formation of alkyl levulinate and furanics intermediate from carbohydrates. HPW4Mo10Ox and HPW4Mo10Ox-Cys, act as acidic catalyst, and catalyze the mono- and disaccharides that are dissolved in primary and secondary alcs. to alkyl levulinate (AL) and alkyl methylfurfural at 170°C under microwave irradiation with glucose as the substrate, AL yield reaches 62% with 84.95% selectivity. The catalyst can be easily recovered by filtration and min. five times reused after calcination without any substantial change in the product selectivity. The anal. anal. of as-synthesis materials done by NH3-TPD, BET, XRD, FESEM, TEM, HRTEM, FTIR, ATR, TGA, DTA to stabilized the morphol. and acidity controlled mechanism.

RSC Advances published new progress about Acidity. 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

Yue, Yuanyuan published the artcileTemplate free synthesis of hierarchical porous zeolite Beta with natural kaolin clay as alumina source, Application In Synthesis of 140-11-4, the main research area is synthesis hierarchical porous zeolite Beta natural kaolin clay; acetic acid benzyl alc esterification catalyst.

A template free synthesis route was developed for the synthesis of hierarchical zeolite Beta from a natural layered aluminosilicate mineral kaolin. Detailed study on the crystallization of zeolite Beta established the optimized synthesis condition, and the synthesized hierarchical Beta zeolite was fully studied by XRD, IR, SEM, TEM, BET, NH3-TPD, Py-IR and NMR techniques. The characterization results reveal that the hierarchical Beta zeolite possesses good crystallinity, bimodal pore architecture, large surface area, big pore volume, high acid site concentration and excellent hydrothermal stability. An improved catalytic performance was achieved in hierarchical Beta zeolite for the esterification of acetic acid with benzyl alc., and the high activity and selectivity in this zeolite are mainly attributed to the presence of mesopores for accelerating the intraparticle diffusion rate of both reactant and product. This novel synthesis methodol. provides a low-cost and environmentally-benign way for the preparation of hierarchical Beta zeolite, which could serve a sustainable platform of large-scale production of hierarchical zeolite for practical application.

Microporous and Mesoporous Materials published new progress about Acidity. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Application In Synthesis of 140-11-4.

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

Almeida Santos, Catia V. published the artcileImpact of SO2 and bentonite addition during fermentation on volatile profile of two varietal white wines, Application of Methyl octanoate, the main research area is sulfur oxide bentonite fermentation white wine.

To understand the impact of SO2 and ascorbic acid (AA) in must fermentation, Arinto and Siŕia musts were fermented under the same conditions, but in the presence of different doses of SO2 and with or without bentonite addition Arinto was fermented with 0, 50, 100 mg/L of SO2 and 100 mg/L of AA. Siria was fermented with 0, 15, 30, 45 mg/L of SO2 and 100 mg/L of AA. The volatile organic compounds (VOCs) were analyzed by HS-SPME-GC/MS. Based on PCA results obtained from VOCs profiles for both varieties, first and second principal components were responsible for more than 60% of the resp. system′s variance. In both wines, the presence or absence of bentonite was clearly discriminated. This work also shows that depending on the different doses of SO2 used, the resulting VOC profiles clearly discriminate these different fermentation conditions. The use of AA in both varieties resulted in a different VOC profile compared to the use of SO2. From this study it was also possible to verify from the VOCs profile, that Arinto wine is less resilient to fermentation changes then Siria wine, which may impact technol. choices.

LWT–Food Science and Technology published new progress about Acidity. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Application of Methyl octanoate.

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

Almeida Santos, Catia V. published the artcileImpact of SO2 and bentonite addition during fermentation on volatile profile of two varietal white wines, Application of Methyl decanoate, the main research area is sulfur oxide bentonite fermentation white wine.

To understand the impact of SO2 and ascorbic acid (AA) in must fermentation, Arinto and Siŕia musts were fermented under the same conditions, but in the presence of different doses of SO2 and with or without bentonite addition Arinto was fermented with 0, 50, 100 mg/L of SO2 and 100 mg/L of AA. Siria was fermented with 0, 15, 30, 45 mg/L of SO2 and 100 mg/L of AA. The volatile organic compounds (VOCs) were analyzed by HS-SPME-GC/MS. Based on PCA results obtained from VOCs profiles for both varieties, first and second principal components were responsible for more than 60% of the resp. system′s variance. In both wines, the presence or absence of bentonite was clearly discriminated. This work also shows that depending on the different doses of SO2 used, the resulting VOC profiles clearly discriminate these different fermentation conditions. The use of AA in both varieties resulted in a different VOC profile compared to the use of SO2. From this study it was also possible to verify from the VOCs profile, that Arinto wine is less resilient to fermentation changes then Siria wine, which may impact technol. choices.

LWT–Food Science and Technology published new progress about Acidity. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Application of Methyl decanoate.

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