Tag: M.W=150-200

Chen, Xiao published the artcileFree and glycosidic volatiles in tamarillo (Solanum betaceum Cav. syn. Cyphomandra betacea Sendt.) juices prepared from three cultivars grown in New Zealand, Name: Methyl octanoate, the main research area is glycosidic volatile tamarillo juice cultivar; PCA; PLS-DA; glycosides; ripening; tamarillo; volatile.

This study investigated the free and glycosidic-bound volatiles in the juice samples of three tamarillo cultivars (i.e. Amber, Mulligan, and Laird’s Large) that are widely grown in New Zealand. Juice samples were prepared from fruits at different ripening stages (green, middle, and ripe). Headspace solid-phase microextraction combined with gas chromatog.-mass spectrometry was applied to analyze the free volatiles in the samples. A total of 20 free volatiles were detected. Among the samples, the ripe Mulligan juice gave the highest contents of free terpenoids (424μg/L) and esters (691μg/L). The glycosidic-bound volatiles were prepared by solid-phase extraction The matrix effect was evaluated based on the recovery rate of analytes containing multiple aglycon classes. From the results, Ph β-D-glucopyranoside was selected to compensate the matrix effect caused by insufficient acquisition of glycosidic volatiles during analyte preparation In all the ripe-fruit juice samples, the aglycons 4-hydroxy-2,5-dimethyl-3(2H)-furanone and trans-2, cis-6-nonadienal were found to give high odor activity values. According to multivariate statistical anal., 11 free volatiles and 22 glycosidic volatiles could be potentially applied as volatile makers to distinguish the juice samples. This study has provided a comprehensive understanding of the flavor chem. of tamarillo juices, with a focus on the potential role of glycosidic aglycons as aroma contributors to tamarillo products.

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

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

Fedunov, Roman G. published the artcileTheory of fluorescence spectrum dynamics and its application to determining the relaxation characteristics of the solvent and intramolecular vibrations, Recommanded Product: Benzyl acetate, the main research area is fluorescence spectrum dynamics solvent intramol vibration relaxation characteristics.

A general anal. expression for the transient fluorescence spectrum is derived. The formation of a wave packet in the excited state of a fluorophore is described, assuming that the pump pulse has a Gaussian time-profile. The expression explicitly connects the relaxation characteristics of the medium with the spectral dynamics of a fluorophore. Fitting the expression to exptl. spectral dynamics allows obtaining the solvent relaxation function. So far this approach was applicable for the anal. of exptl. data when the pump pulse does not populate excited sublevels of intramol. high-frequency vibrational modes. Here, the approach is generalized to include vibrational relaxation in the excited electronic state. In this case, fitting to the exptl. spectral dynamics provides reliable information not only on the solvent relaxation, but also on the relaxation time constants of intramol. high-frequency vibrational modes. This approach is applied to the excited state dynamics of coumarin 153 in multiple solvents, obtained from broadband fluorescence upconversion spectroscopy.

Journal of Molecular Liquids published new progress about Dielectric constant. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Recommanded Product: Benzyl acetate.

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

Rojas, Paula published the artcileRecycling and Conversion of Yeasts into Organic Nitrogen Sources for Wine Fermentation: Effects on Molecular and Sensory Attributes, SDS of cas: 111-11-5, the main research area is Cabernet Sauvignon yeast protein hydrolyzate recycling wine fermentation.

Organic nitrogen plays a significant role in the fermentation performance and production of esters and higher alcs. This study assessed the use of yeast protein hydrolyzate (YPH) as a nitrogen source for grape must fermentation In this study, we prepared an enzymic protein hydrolyzate using yeasts recovered from a previous fermentation of wine. Three treatments were performed. DAP supplementation was used as a control, while two YPH treatments were used. Low (LDH) and high degrees of hydrolysis (HDH), 3.5% and 10%, resp., were chosen. Gas chromatog. and principal component anal. indicated a significant pos. influence of YPH-supplementations on the production of esters and higher alcs. Significantly high concentrations of 3-methyl-1-penthanol, isoamyl alc., isobutanol, and 2-phenylethanol were observed Significant odorant activity was obtained for 3-methyl-1-pentanol and ethyl-2-hexenoate. The use of YPH as nitrogen supplementation is justified as a recycling yeasts technique by the increase in volatile compounds

Fermentation published new progress about Dietary supplements. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, SDS of cas: 111-11-5.

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

Molisso, Susannah published the artcileMolecular interaction and partitioning in α-keratin using 1H NMR spin-lattice (T1) relaxation times, Name: Benzyl acetate, the main research area is hair alpha keratin mol interaction partitioning; spin lattice relaxation time 1HNMR; hair; interactions; keratin; populations; relaxation; solid-state NMR.

The interactions between small mols. and keratins are poorly understood. In this paper, a NMR method is presented to measure changes in the 1H T1 relaxation times of small mols. in human hair keratin to quantify their interaction with the fiber. Two populations of small-mol. compounds were identified with distinct relaxation times, demonstrating the partitioning of the compounds into different keratin environments. The changes in relaxation time for solvent in hair compared with bulk solvent were shown to be related to the mol. weight (MW) and the partition coefficient, LogP, of the solvent investigated. Compounds with low MWs and high hydrophilicities had greater reductions in their T1 relaxation times and therefore experienced increased interactions with the hair fiber. The relative population sizes were also calculated This is a significant step towards modeling the behavior of small mols. in keratinous materials and other large insoluble fibrous proteins.

Journal of the Royal Society, Interface published new progress about Electrostatic force. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Name: Benzyl acetate.

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

Marquez-Lemus, Mario published the artcileAssessment of the variation of the volatile compound composition and antioxidant activity in Opuntia fruits liquors during the maceration process, Recommanded Product: Ethyl nonanoate, the main research area is volatile compound antioxidant Opuntia fruit liquor maceration.

Opuntia genus belongs to the Cactaceae family, Mexico is the major producer in the world. Due to Opuntia’s phytochem. content and their health-related benefits, was proposed the elaboration of liquor using Opuntia fruit. Phenolic content, volatile aromatic profile, antioxidant activity, and sensory evaluation were carried out to characterize the liquor. Sensorial evaluation results showed that L-2D (2 day-macerated liquor) has the higher consumers’ acceptance. Moreover, L-2D had the highest content of volatile compounds (348 mg/L), and the highest antioxidant activity (1.29, 1.63 and 2.05 mmol Trolox/L, according to ABTS, DPPH and FRAP methods, resp.). We could identify and quantify 29 volatile compounds, being Et acetate and D-limonene those with the highest content. Quercitrin was the most abundant phenolic compound in the liquor. The findings of this study demonstrate that Opuntia liquor is a rich source of phenolics and aromatic compounds that would be a drink with the probability of being commercialize.

CyTA–Journal of Food published new progress about Alcoholic beverages. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Recommanded Product: Ethyl nonanoate.

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

Qian, Yanping L. published the artcileCharacterization of Qingke Liquor Aroma from Tibet, Related Products of esters-buliding-blocks, the main research area is Qingke liquor aroma; Q-value; Qingke liquor; aroma extract dilution analysis; odor active value; stable isotope dilution analysis.

Qingke liquor is a very famous Tibetan alc. beverage made from “”Qingke””, hull-less highland barley, which is exclusively grown in Qinghai-Tibetan Plateau with an average altitude of 4000 m. Qingke liquor made in such an area whose quality or characteristics is a result of its geog. environment, including natural and human culture. In this study, the aroma compounds in two Qingke liquors made from highland barley grown at different elevations (QKH, high elevation, and QKL, low elevation) were compared by aroma extract dilution anal. (AEDA), aroma intensity (Osme), odor activity values (OAVs, ratio of concentration to odor threshold), and aroma recombination. Results revealed Et acetate, Et 2-Me propanoate, Et butanoate, Et 3-Me butanoate, Et pentanoate, Et hexanoate, Et octanoate, 3-methylbutanal, 3-methyl-1-butanol, 1-octen-3-ol, β-damascenone, 2,3-butanedione (diacetyl), acetoin, and 2-methoxyphenol (OAV ≥ 10) as important aroma active compounds to Qingke liquors. However, QKH had higher OAVs for most of the compounds than that of QKL. An aroma recombination study confirmed the anal. of aroma-active compounds in Qingke liquor, whereas the aroma emission test demonstrated 3-methylbutanal as the key aroma compound for both Qingke liquors.

Journal of Agricultural and Food Chemistry published new progress about Alcoholic beverages. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Related Products of esters-buliding-blocks.

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

Fracassetti, Daniela published the artcileLight-Struck Taste in White Wine: Protective Role of Glutathione, Sulfur Dioxide and Hydrolysable Tannins, SDS of cas: 123-29-5, the main research area is white wine light struck taste; glutathione sulfur dioxide hydrolyze tannin; glutathione; hydrolysable tannins; light-struck taste; storage; sulfur dioxide; white wine.

Light exposure of white wine can cause a light-struck taste (LST), a fault induced by riboflavin (RF) and methionine (Met) leading to the formation of volatile sulfur compounds (VSCs), including methanethiol (MeSH) and di-Me disulfide (DMDS). The study aimed to investigate the impact of different antioxidants, i.e., sulfur dioxide (SO2), glutathione (GSH) and chestnut tannins (CT), on preventing LST in model wine (MW) and white wine (WW), both containing RF and Met. Both MW and WW samples were added with the antioxidants, either individually or in different combinations, prior to 2-h light exposure and they were stored in the dark for 24 mo. As expected, the light induced the degradation of RF in all the conditions assayed. Met also decreased depending on the antioxidants added. The presence of antioxidants limited the formation of LST as lower concentrations of VSCs were found in both MW and WW samples. In the latter matrix, neither MeSH nor DMDS were detected in the presence of CT, while only DMDS was found in WW+GSH, WW+SO2+GSH and WW+CT+SO2 samples at a concentration lower than the perception thresholds. Considering the antioxidants individually, the order of their effectiveness was CT ≥ GSH > SO2 in WW under the adopted exptl. conditions. The results indicate tannins as an effective enol. tool for preventing LST in white wine and their use will be further investigated in different white wines under industrial scale.

Molecules published new progress about Anaerobic oxidation. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, SDS of cas: 123-29-5.

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

Lim, Sooho published the artcileAbdominal contact of fluvalinate induces olfactory deficit in Apis mellifera, Recommanded Product: Benzyl acetate, the main research area is Apis abdomen fluvalinate olfactory cognition; Fluvalinate; Olfactory deficit; Olfactory modulation; Short neuropeptide F; sNPF signaling.

The τ-Fluvalinate (fluvalinate) is a highly selective pyrethroid insecticide compound used for controlling ectoparasitic mites that cause major damages in honey bee colonies. Although honey bees have resistance and low toxicity to this xenobiotic chem., little is known about the effects of this chem. on sensory modulation and behaviors in honey bees. Here we addressed the effect on olfactory cognition at the behavioral, mol., and neurophysiol. levels. First, we found that topical application of fluvalinate to honeybee abdomen elicited somewhat severe toxicity to honey bees. Furthermore, honeybees treated with sublethal doses of fluvalinate showed a significant decrease in olfactory responses. At the mol. level, there was no change in gene expression levels of odorant receptor co-receptor (Orco), which is important for elec. conductivity induced by odorant binding in insects. Rather, small neuropeptide F (sNPF) signaling pathway was involved in olfactory fluctuation after treatment of fluvalinate. This indicates that olfactory deficits by abdominal contact of fluvalinate may stem from various internal mol. pathways in honey bees.

Pesticide Biochemistry and Physiology published new progress about Antennas, apparatus. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Recommanded Product: Benzyl acetate.

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

Molnar, Bela Peter published the artcileDevelopment of a Female-Targeted Lure for the Box Tree Moth Cydalima perspectalis (Lepidoptera: Crambidae): a Preliminary Report, Related Products of esters-buliding-blocks, the main research area is Cydalima bisexual lure flower volatile; Bisexual lure; Flower volatiles; Invasive pest; Pheromone; Trapping.

In this study, we aimed to develop a “”bisexual”” lure to attract both female and male moths. Based on a previous screening bioassay we tested Me salicylate, phenylacetaldehyde and eugenol as potential attractants in different combinations. The trapping results showed that both binary and ternary blends attracted male and female moths. Catches with these blends were comparable to catches with the synthetic pheromone. Subsequently we carried out single sensillum recordings, which proved the peripheral detection of the above-mentioned compounds on male and female antennae. To identify synergistic flower volatiles, which can be also attractive and can increase the trap capture, we collected flower headspace volatiles from 12 different flowering plant species. Several components of the floral scents evoked good responses from antennae of both females and males in gas chromatog.-electroantennog. detection. The most active components were tentatively identified by gas chromatog. coupled mass spectrometry as benzaldehyde, cis-ss-ocimene, (±)-linalool and phenethyl alc. These selected compounds in combination did not increase significantly the trap capture compared to the Me salicylate- phenyacetaldehyde blend. Based on these results we discovered the first attractive blend, which was able to attract both adult male and female C. perspectalis in field conditions.

Journal of Chemical Ecology published new progress about Antennas, apparatus. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Related Products of esters-buliding-blocks.

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

Liguori, Loredana published the artcileInfluence of malt composition on the quality of a top fermented beer, HPLC of Formula: 106-32-1, the main research area is beer fermentation quality parameter colored malt effect; Antioxidants; Aroma; Beer; Malt; Quality; Sensory.

The beer is a widely consumed drink, appreciated for its sensory characteristics, and it also contains beneficial compounds for health derived from its raw materials. In this work, the influence of colored malt on the main quality parameters of a top-fermenting beer was evaluated. The beers were produced increasing the percentage of colored malt (0, 5, 15% Caraamber) respect to the pale ale base malt. The beers had an alc. content ranging from 6.2 to 6.8 vol%; the results highlighted a deeper color, increased bitterness and turbidity in beer with the highest amount of Caraamber malt. This latter showed the highest polyphenols (453.8 mg GAE/L) and antioxidant activity (840.1μmol TE/L) and, on the other hand, the lowest foam stability. The volatiles profile showed a higher amount of aldehydes and ketones in beer with the highest percentage of caramel malt but the lowest in higher alcs. and esters. No differences were found in the fruity-esters, alc. and caramel sensory notes; while the beer made with 15% of colored malt was perceived sweeter and with less fruity citrus notes than other beer samples.

Journal of Food Science and Technology (New Delhi, India) published new progress about Alcohols Role: FFD (Food or Feed Use), BIOL (Biological Study), USES (Uses). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, HPLC of Formula: 106-32-1.

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