Category: esters-buliding-blocks

Guo, Haixin published the artcileSynthesis of ethyl levulinate over amino-sulfonated functional carbon materials, Formula: C7H12O3, the main research area is ethyl levulinate preparation amino sulfonated functional carbon catalyst.

Functional carbon materials (FCM) containing amino and sulfonate groups (NS-FCM) were prepared with one-pot hydrothermal carbonization of cellulose using ammonium formate and 5-sulfosalicylic acid additives. The catalytic materials were applied to levulinic acid or furfuryl alc. substrates in ethanol solvent for synthesizing Et levulinate (EL). Catalytic activity of NS-FCM was found to be related to its sulfonate groups, while substrate selectivity of NS-FCM was found to be related to its amino groups as supported by equilibrium adsorption and reaction experiments Pre-adsorbed LA substrate onto NS-FCM followed by ethanol treatment at reaction conditions achieved EL yields higher than 90% that is attributed to a selective adsorption and cooperative desorption mechanism. The activity of NS-FCM catalyst was stable for five reuse cycles, but lost about 10% of its activity from the third cycle that is attributed to adsorption of humin precursors onto active sites.

Renewable Energy 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, Formula: C7H12O3.

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

Pavlovic, J. published the artcileCatalytic activity of SnO2- and SO4/SnO2-containing clinoptilolite in the esterification of levulinic acid, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is catalytic SnO2 SO4 clinoptilolite esterification levulinate Zeolitic tuff.

Catalysts based on natural zeolite – clinoptilolite loaded with either SnO2 (TOHCLI) or sulfated SnO2 (STOHCLI) were prepared and tested in the esterification of levulinic acid (LA) with octanol or ethanol. The Sn content in TOHCLI and STOHCLI varied from 4.5 to 12.3 weight%. The catalysts were characterized by powder X-ray diffraction method, SEM coupled with energy dispersive X-ray spectroscopy, thermal anal., XPS, N2 physisorption at -196 °C, 27Al and 29Si MAS NMR solid state spectroscopy and FTIR spectroscopy for anal. of acidic centers. A high conversion rate of LA into octyl- (OLA) or Et levulinate (ELA) was obtained for both TOHCLI and STOHCLI. TOHCLI showed a high activity in the conversion of LA into OLA (55%) and a moderate activity in the conversion to ELA (22%). STOHCLI led to a total conversion of LA to OLA and ELA due to the presence of a high amount of Bronsted and Lewis acid sites in the catalysts. The catalytic activity decreased to 86% for OLA and to 66% for ELA after next five cycles. Lower catalytic activity in the repeated cycles during ELA formation was explained by pore blockage due to coke formation.

Microporous and Mesoporous Materials 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

Peralta-Ruiz, Yeimmy published the artcilePackham′s triumph pears (Pyrus communis L.) post-harvest treatment during cold storage based on chitosan and rue essential oil, Safety of Benzyl acetate, the main research area is Pyrus communis chitosan Rue essential oil antifungal; Ruta graveolens essential oil; antifungal; chitosan.

Pears (Pyrus communis L.) cv. Packham′s Triumph are very traditional for human consumption, but pear is a highly perishable climacteric fruit with a short shelf-life affected by several diseases with a microbial origin. In this study, a protective effect on the quality properties of pears was evidenced after the surface application of chitosan-Ruta graveolens essential oil coatings (CS + RGEO) in four different concentrations (0, 0.5, 1.0 and 1.5 %, volume/volume) during 21 days of storage under 18 °C. After 21 days of treatment, a weight loss reduction of 10% (from 40.2 ± 5.3 to 20.3 ± 3.9) compared to the uncoated pears was evident with CS + RGEO 0.5%. All the fruits′ phys.-chem. properties evidenced a protective effect of the coatings. The maturity index increased for all the treatments. However, the pears with CS + RGEO 1.5% were lower (70.21) than the uncoated fruits (98.96). The loss of firmness for the uncoated samples was higher compared to the coated samples. The pears′ most excellent mech. resistance was obtained with CS + RGEO 0.5% after 21 days of storage, both for compression resistance (7.42 kPa) and force (22.7 N). Microbiol. studies demonstrated the protective power of the coatings. Aerobic mesophilic bacteria and molds were significantly reduced (in 3 Log CFU/g compared to control) using 15 μL/mL of RGEO, without affecting consumer perception. The results presented in this study showed that CS + RGEO coatings are promising in the post-harvest treatment of pears.

Molecules published new progress about Acidity. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Safety of Benzyl acetate.

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

Aguiar, Dayana published the artcileAgricultural Rum of Madeira matured on the seafloor: improved physicochemical changes induced by a pioneering seafloor ageing process, Name: Ethyl octanoate, the main research area is agricultural rum seafloor physicochem property ageing.

The unique agricultural rum produced in Europe, Agricultural Rum of Madeira, is obtained from alc. fermentation and distillation of sugarcane juice, followed by cask ageing for a min. of 3 years. For the first time, the impact of underwater bottle ageing on the maturation of this type of spirit was studied. Herein, the physicochem. properties of samples of Agricultural Rum of Madeira bottle-aged in a cellar and after 7 and 14 mo on the seafloor were compared. The results revealed significant and pos. changes in the organoleptic properties of the rum after 14 mo of ageing on the seafloor. It was found that underwater ageing does not lead to the loss of the specific polyphenols of the cask-ageing stage (non-flavonoids, 43.53 mg/L after 14 mo on the seafloor) and increases the flavonoids composition (6.88 to 21.09 mg/L after 14 mo). While the acidity increased slightly, the volatile composition of the primary aromas resulting from sugarcane (terpenoids) was unchanged. Esters represented about 85% of the volatile compounds in the bottled sugarcane spirit after ageing in casks and higher concentration (increase of about 23%) were detected after underwater ageing. This study also revealed that 14 mo of underwater ageing promoted a color change to darker tones, with values close to those detected by the human eye (ΔE of 2.47). The principal component anal. highlighted the meaningful changes after 14 mo on seafloor conditions, without any chem. family standing out as the most important.

European Food Research and Technology published new progress about Acidity. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Name: Ethyl octanoate.

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

Maioli, Francesco published the artcileMonitoring of Sangiovese Red Wine Chemical and Sensory Parameters along One-Year Aging in Different Tank Materials and Glass Bottle, Safety of Ethyl nonanoate, the main research area is red wine sensory aging tank materials volatiles.

The aim of this research was to study how different tank materials affected the chem. composition and the sensory profile of a red wine during aging. For this purpose, a single varietal Sangiovese wine was aged at the same time by using different tank materials including stainless steel, epoxy-coated concrete, uncoated concrete, earthenware raw amphorae, and new and used oak barrels. Phenolic and volatile compounds, elemental content, tartaric stability, and sensory discriminant attributes of Sangiovese wine from the 2018 harvest were measured after 6 and 12 mo of aging in tanks and 6 mo in a glass bottle (after the aging of 6 mo carried out in each relevant container). The results showed that the different tanks significantly differentiated the wines on the base of all the chem. and sensory parameters considered. In particular, wines aged in earthenware raw amphorae and uncoated concrete registered a high content of polymeric pigments in the new oak barrel, resulting in materials that better promote the wine color stabilization. The same wines also showed the highest pH and tartaric stability, mostly likely related to the observed release of inorganic compounds from the tank material. Moreover, bottle aging enhanced the chem. and sensory differences between all the wines: they were characterized by a higher content of varietal volatiles such as norisoprenoids and terpenes, probably due to the reductive conditions in the bottle. The bottle also affected the perceived quality of the wines aged in concrete (uncoated and epoxy-coated) associated to the floral flavor, floral odor, sweetness attributes, and, to a lesser extent, acidity, while the ones aged in stainless steel and amphorae is associated to the berry jam odor.

ACS Food Science & Technology published new progress about Acidity. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Safety of Ethyl nonanoate.

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

D’Agostino, Maria F. published the artcileBlackberries (Rubus ulmifolius Schott) from Calabria (Italy): a comprehensive characterisation, Synthetic Route of 5405-41-4, the main research area is Rubus ulmifolius Schott quality characterization.

The establishment of the corresponding standards of quality to promote the commercialization of Rubus ulmifolius Schott (Rosaceae) blackberries from Calabria (Italy) has been aimed in this study. Data on the volatile composition gathered by Solid-Phase Microextraction (SPME) followed by GC-MS have been complemented with the study for the first time of physicochem. parameters and antioxidant capacity of wild and cultivated blackberries collected in seven different locations of Calabria. Wild fruits showed significantly higher dry matter content (16.34-22.14%) and pH (3.92-5.12) and lower total acidity (0.23-0.74 as % of citric acid) compared to the cultivated sample (dry matter: 15.31%; pH: 3.30 and total acidity: 1% citric acid), whereas color and total soluble solids were similar. Antioxidant capacity (DPPH assay) of wild blackberries, correlated (r = 0.71) with results from ABTS assay, was significantly higher (SE50 = 1.6-3.4 mg DW), in agreement with its higher content of total anthocyanins and total phenolics. Ethanol (11.8-32.4%), trans-2-hexenal (2.7-21.3%), methylbutanal (5.7-17.4%), and Et acetate (4.6-11.9%) were the major compounds in both wild and cultivated blackberries. Although the presence or relative concentration of several volatiles (e.g. p-cymen-8-ol, decanal, 3-hydroxy esters, etc.) seemed to be characteristic of the harvest location/blackberry type, further research on a higher number of samples should be carried out to confirm these results. The comprehensive characterization addressed for the first time in this paper is a valuable preliminary contribution to satisfy the demand by consumers and farmers of objective data to support the premium quality of Calabrian blackberries.

European Food Research and Technology 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, Synthetic Route of 5405-41-4.

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

D’Agostino, Maria F. published the artcileBlackberries (Rubus ulmifolius Schott) from Calabria (Italy): a comprehensive characterisation, COA of Formula: C11H22O2, the main research area is Rubus ulmifolius Schott quality characterization.

The establishment of the corresponding standards of quality to promote the commercialization of Rubus ulmifolius Schott (Rosaceae) blackberries from Calabria (Italy) has been aimed in this study. Data on the volatile composition gathered by Solid-Phase Microextraction (SPME) followed by GC-MS have been complemented with the study for the first time of physicochem. parameters and antioxidant capacity of wild and cultivated blackberries collected in seven different locations of Calabria. Wild fruits showed significantly higher dry matter content (16.34-22.14%) and pH (3.92-5.12) and lower total acidity (0.23-0.74 as % of citric acid) compared to the cultivated sample (dry matter: 15.31%; pH: 3.30 and total acidity: 1% citric acid), whereas color and total soluble solids were similar. Antioxidant capacity (DPPH assay) of wild blackberries, correlated (r = 0.71) with results from ABTS assay, was significantly higher (SE50 = 1.6-3.4 mg DW), in agreement with its higher content of total anthocyanins and total phenolics. Ethanol (11.8-32.4%), trans-2-hexenal (2.7-21.3%), methylbutanal (5.7-17.4%), and Et acetate (4.6-11.9%) were the major compounds in both wild and cultivated blackberries. Although the presence or relative concentration of several volatiles (e.g. p-cymen-8-ol, decanal, 3-hydroxy esters, etc.) seemed to be characteristic of the harvest location/blackberry type, further research on a higher number of samples should be carried out to confirm these results. The comprehensive characterization addressed for the first time in this paper is a valuable preliminary contribution to satisfy the demand by consumers and farmers of objective data to support the premium quality of Calabrian blackberries.

European Food Research 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, COA of Formula: C11H22O2.

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

Liu, Sheng Hui published the artcileEffect of foliar iron sulfate on the fruit growth and quality of pineapple (Ananas comosus cv. Yellow Mauritius) planted in lateritic soil in Leizhou Peninsula, Recommanded Product: Methyl octanoate, the main research area is Ananas foliar iron sulfate fruit growth lateritic soil China.

Leizhou Peninsula in South China is facing a serious water shortage problem because of the special regional and geol. conditions. As a kind of low water requirement crop, pineapple has been popular in lateritic soil. However, the phys. characteristics of Lateritic soil such as too cohesive, impervious, low content of organic matter, and seasonal arid often bring some problem to pineapple cultivation. Seasonal iron deficiency can be easily observed from Apr. to July. The effect of foliar spray of iron sulfate (with concentration of 0, 0.5%, 0.75%, 1%) on the fruit growth and quality of pineapple cv. Yellow Mauritius were studied in this research. Showed that there were no significant difference (p>0.05) on the fruit weight, longitudinal diameter, transverse diameter among all the treatment. 0.75% treatment increased the fruit weight to 6.08% and decreased crown weight significantly. Both 0.75% and 1% iron sulfate treatment not only enhanced vitamin C extremely significantly, but also improved the aroma quality significantly with the increase of total esters, especially in the content of hexanoic acid Me ester, 3-(Me tio) propanoic acid Me ester and 2-methyl- butanoic acid Me ester. The content of these 3 esters above were all extremely significantly higher than control, which means much stronger pleasant aroma. Hence, 0.75% was the optimal concentration of foliar spray with iron sulfate in pineapple cv. Yellow Mauritius.

E3S Web of Conferences published new progress about Acidity. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Recommanded Product: Methyl octanoate.

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

de Andrade Neves, Nathalia published the artcileChemical composition of jabuticaba (Plinia jaboticaba) liquors produced from cachaca and cereal alcohol, Quality Control of 5405-41-4, the main research area is Plinia jaboticaba liquor cachaca cereal alc volatile composition.

Jabuticaba (Plinia jaboticaba (DC) Berg.) is considered one of the main Brazilian sources of anthocyanins. It is widely recognized and popular, with its consumption occurring in fresh forms and through processed products. Although popular, jabuticaba liquors are handmade, on a small-scale, with little quality control and a lack of standardization. This study aimed to evaluate the effect of the ethanol source (cachaca and cereal alc.) on the chem. characteristics of jabuticaba liquors. The beverages were evaluated considering the contents of sugars, ethanol, anthocyanins, ellagic acid, amino acids, biogenic amines, organic acids, and volatile composition The liquors showed similar chem. compositions, which differs from the content of anthocyanins and the volatile composition The liquor made from cachaca showed a greater complexity of aroma, including terpenes and volatile phenolic compounds, and a higher d.p. of anthocyanins. This study is the first published for jabuticaba liquors.

LWT–Food Science and Technology 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, Quality Control of 5405-41-4.

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

Deyle, Kaycie M. published the artcileA protein-targeting strategy used to develop a selective inhibitor of the E17K point mutation in the PH domain of Akt1, HPLC of Formula: 882847-32-7, the main research area is protein Akt1 inhibitor E17K mutation PH domain PIP3 peptide.

Ligands that can bind selectively to proteins with single amino-acid point mutations offer the potential to detect or treat an abnormal protein in the presence of the wild type (WT). However, it is difficult to develop a selective ligand if the point mutation is not associated with an addressable location, such as a binding pocket. Here we report an all-chem. synthetic epitope-targeting strategy that we used to discover a 5-mer peptide with selectivity for the E17K-transforming point mutation in the pleckstrin homol. domain of the Akt1 oncoprotein. A fragment of Akt1 that contained the E17K mutation and an I19[propargylglycine] substitution was synthesized to form an addressable synthetic epitope. Azide-presenting peptides that clicked covalently onto this alkyne-presenting epitope were selected from a library using in situ screening. One peptide exhibits a 10:1 in vitro selectivity for the oncoprotein relative to the WT, with a similar selectivity in cells. This 5-mer peptide was expanded into a larger ligand that selectively blocks the E17K Akt1 interaction with its PIP3 (phosphatidylinositol (3,4,5)-trisphosphate) substrate.

Nature Chemistry published new progress about Epitopes. 882847-32-7 belongs to class esters-buliding-blocks, name is 1-(9H-Fluoren-9-yl)-3-oxo-2,7,10,13,16,19-hexaoxa-4-azadocosan-22-oic acid, and the molecular formula is C28H37NO9, HPLC of Formula: 882847-32-7.

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