Category: esters-buliding-blocks

Kumari, P. Krishna published the artcileNiobium exchanged tungstophosphoric acid supported on titania catalysts for selective synthesis of 5-ethoxymethylfurfural from fructose, SDS of cas: 539-88-8, the main research area is ethoxymethylfurfural preparation titania support tungstophosphoric acid catalyst property.

Various niobium contained tungstophosphoric acid (NbTPA) supported on titania catalysts were prepared and investigated their activity for selective synthesis of 5-ethoxymethylfurfural (EMF) from fructose in ethanol/THF solvent system. Physico-chem. properties of the catalysts were assessed by different spectroscopic approaches like X-ray diffraction, Laser Raman, BET-surface area, FT-IR, pyridine adsorbed FT-IR and temperature programmed desorption of ammonia. The results of characterization direct the existence of firm Keggin ion structure of Nb exchanged TPA and its well dispersed state on support. Lewis acidic sites were induced with the existence of Nb ions. The catalytic activity was interrelated to the catalyst acidity which was liable on the number of Nb ions present in TPA and the amount of NbxTPA supported on TiO2. Among all catalysts 20wt% Nb0.4TPA/TiO2 catalyst showed best catalytic performance toward EMF with a yield of 76% at 130°C after 6 h. The catalyst is recyclable without any depletion of activity.

Molecular Catalysis 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, SDS of cas: 539-88-8.

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

Zhang, Yu-Shu published the artcileThe effect of carbonic maceration during winemaking on the color, aroma and sensory properties of ′Muscat Hamburg′ wine, Quality Control of 111-11-5, the main research area is Muscat Hamburg wine carbonic maceration color aroma sensory property; Muscat Hamburg wine; aroma; carbonic maceration; color; sensory evaluation.

This is the first study on the effect of carbonic maceration on the quality (color, aroma profile and sensory properties) of Muscat Hamburg, contrasting two winemaking procedures used in Tianjin (classical white and red-winemaking techniques). The values of C* (psychometric chroma), a* (measure of redness) and b* (measure of yellowness) were significantly higher (p < 0.01) in the carbonic macerated wine than in red wine. However, there were no visual differences in color, and classical red wine and carbonic macerated wine had similar h (hue angle) values and located in the red region. Thirty-two aromatic compounds were identified and quantified in Muscat Hamburg wines. The content of volatile compounds (6384.97 μg/L) was significantly higher (p < 0.001) in the carbonic macerated Muscat Hamburg wine than in the other kinds of wine. This result led to the carbonic macerated wine having the highest odor activity values (OAVs) and sensory evaluation scores (86.8 points), which correlates with an ""excellent"" sensory perception. This study demonstrated that carbonic maceration significantly improved the quality of Muscat Hamburg wine based on volatile anal. and sensory evaluation compared with other conventional methods. Therefore, carbonic maceration could be well suited for making Muscat Hamburg wine. Molecules published new progress about Acidity. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Quality Control of 111-11-5.

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

Scott, Gabrielle published the artcileExploring Plant Performance, Fruit Physicochemical Characteristics, Volatile Profiles, and Sensory Properties of Day-Neutral and Short-Day Strawberry Cultivars Grown in Texas, Computed Properties of 110-42-9, the main research area is strawberry cultivar volatile profile sensory physicochem Texas; Fragaria × ananassa; Texas strawberry; descriptive sensory analysis; strawberry cultivation; strawberry flavor; strawberry volatiles.

To assist increasing annual acreage of Texas-grown (U.S.A.) strawberries, it is essential to select cultivars with excellent plant and fruit quality characteristics suitable to the diverse environments. This study assessed multiple traits of 10 strawberry cultivars grown under high tunnels. A significant difference (p ≤ 0.05) was observed for all traits, which possessed a wide variability of metabolites. Plant anal. (number of live plants, plant vigor, and harvest yield) indicated that the yield ranged from 226 to 431 g/plant, pos. correlated to plant vigor. Fruit physicochem. characteristic anal., including red color (absorbance at 500 nm) and taste-associated indicators [°Brix, titratable acidity (TA), and total soluble solids (TSS)/TA], showed that °Brix and TSS/TA ranged from 8.0 to 12.9 and from 9.1 to 15.3, resp. More than 300 volatiles were identified using solid-phase microextraction-gas chromatog.-mass spectrometry, and total volatiles varied 1.5 times with high variance of individual compounds between cultivars. Descriptive sensory anal. indicated that strawberry flavor was pos. associated with sensory attributes of sweetness, jammy, fruity, buttery, fresh, and creamy while neg. related to bitterness, astringency, and sourness. Partial least squares regression indicated that strawberry flavor was highly correlated with sweet taste and volatile composition No specific relationship between these traits and day-neutral or June-bearing varieties was identified. Ideal cultivars for Texas growing conditions with superior and balanced flavor qualities were Albion, Sweet Charlie, Camarosa, Camino Real, and Chandler.

Journal of Agricultural and Food Chemistry published new progress about Acidity. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Computed Properties of 110-42-9.

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

Scott, Gabrielle published the artcileExploring Plant Performance, Fruit Physicochemical Characteristics, Volatile Profiles, and Sensory Properties of Day-Neutral and Short-Day Strawberry Cultivars Grown in Texas, Related Products of esters-buliding-blocks, the main research area is strawberry cultivar volatile profile sensory physicochem Texas; Fragaria × ananassa; Texas strawberry; descriptive sensory analysis; strawberry cultivation; strawberry flavor; strawberry volatiles.

To assist increasing annual acreage of Texas-grown (U.S.A.) strawberries, it is essential to select cultivars with excellent plant and fruit quality characteristics suitable to the diverse environments. This study assessed multiple traits of 10 strawberry cultivars grown under high tunnels. A significant difference (p ≤ 0.05) was observed for all traits, which possessed a wide variability of metabolites. Plant anal. (number of live plants, plant vigor, and harvest yield) indicated that the yield ranged from 226 to 431 g/plant, pos. correlated to plant vigor. Fruit physicochem. characteristic anal., including red color (absorbance at 500 nm) and taste-associated indicators [°Brix, titratable acidity (TA), and total soluble solids (TSS)/TA], showed that °Brix and TSS/TA ranged from 8.0 to 12.9 and from 9.1 to 15.3, resp. More than 300 volatiles were identified using solid-phase microextraction-gas chromatog.-mass spectrometry, and total volatiles varied 1.5 times with high variance of individual compounds between cultivars. Descriptive sensory anal. indicated that strawberry flavor was pos. associated with sensory attributes of sweetness, jammy, fruity, buttery, fresh, and creamy while neg. related to bitterness, astringency, and sourness. Partial least squares regression indicated that strawberry flavor was highly correlated with sweet taste and volatile composition No specific relationship between these traits and day-neutral or June-bearing varieties was identified. Ideal cultivars for Texas growing conditions with superior and balanced flavor qualities were Albion, Sweet Charlie, Camarosa, Camino Real, and Chandler.

Journal of Agricultural and Food Chemistry published new progress about Acidity. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Related Products of esters-buliding-blocks.

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

Scott, Gabrielle published the artcileExploring Plant Performance, Fruit Physicochemical Characteristics, Volatile Profiles, and Sensory Properties of Day-Neutral and Short-Day Strawberry Cultivars Grown in Texas, Computed Properties of 140-11-4, the main research area is strawberry cultivar volatile profile sensory physicochem Texas; Fragaria × ananassa; Texas strawberry; descriptive sensory analysis; strawberry cultivation; strawberry flavor; strawberry volatiles.

To assist increasing annual acreage of Texas-grown (U.S.A.) strawberries, it is essential to select cultivars with excellent plant and fruit quality characteristics suitable to the diverse environments. This study assessed multiple traits of 10 strawberry cultivars grown under high tunnels. A significant difference (p ≤ 0.05) was observed for all traits, which possessed a wide variability of metabolites. Plant anal. (number of live plants, plant vigor, and harvest yield) indicated that the yield ranged from 226 to 431 g/plant, pos. correlated to plant vigor. Fruit physicochem. characteristic anal., including red color (absorbance at 500 nm) and taste-associated indicators [°Brix, titratable acidity (TA), and total soluble solids (TSS)/TA], showed that °Brix and TSS/TA ranged from 8.0 to 12.9 and from 9.1 to 15.3, resp. More than 300 volatiles were identified using solid-phase microextraction-gas chromatog.-mass spectrometry, and total volatiles varied 1.5 times with high variance of individual compounds between cultivars. Descriptive sensory anal. indicated that strawberry flavor was pos. associated with sensory attributes of sweetness, jammy, fruity, buttery, fresh, and creamy while neg. related to bitterness, astringency, and sourness. Partial least squares regression indicated that strawberry flavor was highly correlated with sweet taste and volatile composition No specific relationship between these traits and day-neutral or June-bearing varieties was identified. Ideal cultivars for Texas growing conditions with superior and balanced flavor qualities were Albion, Sweet Charlie, Camarosa, Camino Real, and Chandler.

Journal of Agricultural and Food Chemistry published new progress about Acidity. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Computed Properties of 140-11-4.

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

Scott, Gabrielle published the artcileExploring Plant Performance, Fruit Physicochemical Characteristics, Volatile Profiles, and Sensory Properties of Day-Neutral and Short-Day Strawberry Cultivars Grown in Texas, Application of Ethyl 3-hydroxybutanoate, the main research area is strawberry cultivar volatile profile sensory physicochem Texas; Fragaria × ananassa; Texas strawberry; descriptive sensory analysis; strawberry cultivation; strawberry flavor; strawberry volatiles.

To assist increasing annual acreage of Texas-grown (U.S.A.) strawberries, it is essential to select cultivars with excellent plant and fruit quality characteristics suitable to the diverse environments. This study assessed multiple traits of 10 strawberry cultivars grown under high tunnels. A significant difference (p ≤ 0.05) was observed for all traits, which possessed a wide variability of metabolites. Plant anal. (number of live plants, plant vigor, and harvest yield) indicated that the yield ranged from 226 to 431 g/plant, pos. correlated to plant vigor. Fruit physicochem. characteristic anal., including red color (absorbance at 500 nm) and taste-associated indicators [°Brix, titratable acidity (TA), and total soluble solids (TSS)/TA], showed that °Brix and TSS/TA ranged from 8.0 to 12.9 and from 9.1 to 15.3, resp. More than 300 volatiles were identified using solid-phase microextraction-gas chromatog.-mass spectrometry, and total volatiles varied 1.5 times with high variance of individual compounds between cultivars. Descriptive sensory anal. indicated that strawberry flavor was pos. associated with sensory attributes of sweetness, jammy, fruity, buttery, fresh, and creamy while neg. related to bitterness, astringency, and sourness. Partial least squares regression indicated that strawberry flavor was highly correlated with sweet taste and volatile composition No specific relationship between these traits and day-neutral or June-bearing varieties was identified. Ideal cultivars for Texas growing conditions with superior and balanced flavor qualities were Albion, Sweet Charlie, Camarosa, Camino Real, and Chandler.

Journal of Agricultural and Food Chemistry published new progress about Acidity. 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Application of Ethyl 3-hydroxybutanoate.

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

Dai, Jinhang published the artcileAdjusting the acidity of sulfonated organocatalyst for the one-pot production of 5-ethoxymethylfurfural from fructose, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is sulfonated polymer organocatalyst fructose conversion ethoxymethylfurfural production.

We report a novel solid organocatalyst, a double-hydrogen-bonded sulfonated polymer catalyst (D-SPC), for the cascade conversion of fructose to 5-ethoxymethylfurfural (EMF) with a highest yield of 68.8 mol% and good catalyst recyclability. We demonstrate that the treatment of a sulfonated nitrogen-containing polymer catalyst (SPC) with dihydroxy acetone (DHA) mols. generates new double hydrogen-bonds (H-bonds) between the ring-attached sulfonic acid groups and DHA by deconstructing the existing H-bonds between the sulfonic acid groups and imine/amine nitrogens of the SPC, which is confirmed by FT-IR spectroscopy, elemental anal., 1H MAS and 13C cross-polarization MAS NMR, XPS, and quantum chem. calculations The 31P MAS NMR, pHsurface, and NH3-TPD of the catalysts reveal the weakening of acidity strength due to the stronger double H-bonding on the D-SPC. Notably, we figure out the inverse relationship between the acidity strength of the catalysts and the EMF yield in the one-pot fructose-to-EMF conversion, wherein the use of weaker acid catalysts accelerates the fructose dehydration while decelerating the side-reaction of furan ring opening, therefore avoiding the neg. influence of water on the tandem reactions. Moreover, the existence of stable double H-bonds contributes to the good catalyst recyclability due to the stabilization of sulfonic acid groups. The acidic property of the solid catalysts could be adjusted by varying the DHA dosage and the preparation conditions of the SPC (i.e., monomer ratio and oxidant dosage), resp. We show that the solid acid catalyst with weaker acidity strength and suitable acidity d. (ca. 2.5 mmol g-1) is favorable for the one-pot synthesis of EMF directly from fructose. This work highlights the application of novel sulfonated polymer catalysts with adjustable acidic property for the highly selective production of EMF, a liquid biofuel candidate, from biomass-derived carbohydrates.

Catalysis Science & 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, Recommanded Product: Ethyl 4-oxopentanoate.

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

Li, Wenke published the artcileHf-based metal organic frameworks as bifunctional catalysts for the one-pot conversion of furfural to γ-valerolactone, Computed Properties of 539-88-8, the main research area is hafnium metal organic framework bifunctional catalyst furfural valerolactone.

One-pot conversion of furfural to the target product γ-valerolactone (GVL) is a challenging and meaningful part of biomass exploitation. Development of heterogeneous catalysts with both Bronsted and Lewis acid properties has proved to be promising and useful because they offer an efficient way to tandem cascade reactions from furfural to GVL. Herein, we successfully synthesized sulfated DUT-67(Hf), a novel bifunctional catalyst, via a post-synthetic modification method. The prepared sulfated DUT-67(Hf) was characterized by XRD, SEM, TEM, N2 adsorption-desorption, Elemental (N, C, H, S) analyses, situ IR spectra of pyridine adsorptions, XPS, FT-IR, TG, and NH3-TPD. The acidity of the catalysts could be adjusted by submersion in different concentrations of aqueous sulfuric acid, giving 0.01 mol/L sulfuric acid for 0.42 mmol/g acidity to 0.1 mol/L sulfuric acid for 2.16 mmol/g acidity. Sulfated DUT-67(Hf) possessed by 0.06 mol/L aqueous sulfuric acid exhibited optimal catalytic activity and showed an 87.1% yield of GVL under the conditions of 180 °C after 24 h of reaction. Moreover, the mechanism of introducing Bronsted acid sites into DUT-67(Hf) and the better hydrogen donors was also investigated through contrasting experiments

Molecular Catalysis 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, Computed Properties of 539-88-8.

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

Kute, Vivek B. published the artcileConsequences of the first and second COVID -19 wave on kidney transplant recipients at a large Indian transplant centre, Application of 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate, the main research area is coronavirus disease consequence neutrophil kidney transplant human India; COVID-19; first wave; kidney transplant recipients; second wave.

There is a scarcity of data comparing the consequences of first and second COVID-19 waves on kidney transplant recipients (KTRs) in India. We conducted a single-center retrospective study of 259 KTRs with COVID-19 to compare first wave (March 15-Dec. 31 2020, n = 157) and second wave (Apr. 1-May 31 2021, n = 102). KTRs during second wave were younger (43 vs. 40 years; p-value .04) and also included paediatric patients (0 vs. 5.9%; p-value .003). Symptoms were milder during the second wave (45 vs. 62.7%; p-value .007); COVID-19 pos. patients had less frequent cough (32 vs. 13.8%; p-value .001), fever was less frequent (58 vs. 37%; p-value .001), and we observed fewer co-morbidities (11 vs. 20.6%; p-value .04). The percentages of neutrophils (77 vs. 83%; p-value .001) and serum ferritin (439 vs. 688; p-value .0006) were higher during second wave, while lymphocyte counts were reduced (20 vs. 14%; p-value .0001). Hydroxychloroquine (11 vs. 0%; p-value .0001) and tocilizumab (7 vs. 0%; p-value .004) were more frequently prescribed during first wave, while utilization of dexamethasone (6 vs. 27%; p-value .0001) and remdesivir (47 vs. 65%; p-value .03) increased during the second wave. Mucormycosis (1.3 vs. 10%; p-value .01) and ICU admissions (20 vs. 37.2%; p-value .002) were more frequent during second wave. The 28-day mortality rate (9.6 vs. 10%; p-value 1) was not different. There has been a different clin. spectrum of COVID-19 amongst KTR with similar mortality between the two waves at a large Indian transplant center.

Nephrology published new progress about Ageusia. 55981-09-4 belongs to class esters-buliding-blocks, name is 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate, and the molecular formula is C12H9N3O5S, Application of 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate.

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

ElMasry, Gamal published the artcileReal-time quality authentication of honey using atmospheric pressure chemical ionisation mass spectrometry (APCI-MS), Product Details of C9H18O2, the main research area is honey adulteration atm pressure chem ionization mass spectrometry.

The aim of this study was to use gas chromatog.-mass spectrometry (GC-MS) and APCI-MS techniques to detect adulteration in honey. The key volatile compounds in the headspace of the adulterated honey were marked by GC-MS and their representative fragment ions were utilized in scanning honey samples using the real-time APCI-MS system. The PLS models validated using independent data sets resulted in coefficient of the determination (Rp2) of 0.97 and 0.96 and root mean square error in prediction (RMSEP) of 2.62 and 2.45 for the GC-MS and APCI-MS data sets resp. The most efficient volatiles from GC-MS anal. and their corresponding fragment ions m/z from APCI-MS data anal. were then identified and used to develop new PLS models to predict the level of adulteration. The best PLS model gave Rp2 of 0.95 and RMEP of 2.60% in the independent validation set indicating that the model was very accurate in predicting the level of adulteration.

International Journal of Food Science and Technology published new progress about Alfalfa. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Product Details of C9H18O2.

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