Month: December 2022

Tang, Ke published the artcileChemical and Sensory Characterization of Vidal Icewines Fermented with Different Yeast Strains, COA of Formula: C9H18O2, the main research area is icewine volatile compound aroma fermentation.

The aim of this study is to comprehensively investigate the aroma composition and sensory attributes of Vidal icewine fermented with four yeast strains (ST, K1, EC1118, and R2). A total of 485 kinds of volatile components were identified by comprehensive two-dimensional gas chromatog.-time of flight mass spectrometry, among which 347 kinds of volatile compounds were the same in four kinds of sample. The heat map was conducted with 156 volatile compounds, which have aroma contributions, and the anal. results identified the characteristics of the aroma composition of icewine fermented with different yeasts. Quant. descriptive anal. was performed with a trained panel to obtain the sensory profiles. The aroma attributes of honey and nut of the icewine fermented by R2 were much higher than others. Partial least squares discriminant anal. further provided 40 compounds that were mainly responsible for the differences of the aroma characteristics of the icewines fermented by four yeasts. This study provides more data on the current status of Vidal icewines by main com. yeasts.

Fermentation published new progress about Caramel (color). 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, COA of Formula: C9H18O2.

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

Thompson-Witrick, Katherine A. published the artcileBicarbonate Inhibition and Its Impact on Brettanomyces bruxellensis Ability to Produce Flavor Compounds, HPLC of Formula: 106-32-1, the main research area is Brettanomyces beer volatile flavor compound bicarbonate.

Water chem. and the utilization of brewing salts such as gypsum, magnesium sulfate and bicarbonates, have been well documented for Saccharomyces cerevisiae, however, there has been limited published research on the impact bicarbonates have on Brettanomyces, especially in a brewing application. The objective of this project was to look at varying levels of added bicarbonates (0, 50, 75 and 100 mg/L) to identify correlations between bicarbonate content and the fermentation activity of Brettanomyces bruxellensis within beer. Two, 58.7 L brews with a target OG of 1.040 were brewed using a recirculating infusion mash system and mixed-together using a mash mixer to create one, 117.4 L batch to reduce variability. The batch was split into three, 37.9 L allotments and treated as triplicates. The beer was hopped to 20 IBUs using Bravo hops. Brettanomyces bruxellensis was propagated prior to being pitched at 1.2 million cells per degree Plato. After inoculation, the triplicates were stored at 21 °C until fermentation was completed. The reduction in gravity caused by the Brettanomyces was followed using a digital airlock and a benchtop densitometer. GC-MS was used for the anal. of the volatile compounds within the exptl. beers. Statistical anal. (p < 0.05) showed that there were significant differences between the fermentation activity, including flavor compound production, of the different batches brewed at different bicarbonate levels. The total concentration of volatiles ranged from 69.76 to 83.4 mg/L within the different beers. It was concluded that the varying levels of bicarbonates had an impact not only on the fermentation, but also on the volatile compounds Journal of the American Society of Brewing Chemists published new progress about Beer. 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

Thompson-Witrick, Katherine A. published the artcileBicarbonate Inhibition and Its Impact on Brettanomyces bruxellensis Ability to Produce Flavor Compounds, Computed Properties of 123-29-5, the main research area is Brettanomyces beer volatile flavor compound bicarbonate.

Water chem. and the utilization of brewing salts such as gypsum, magnesium sulfate and bicarbonates, have been well documented for Saccharomyces cerevisiae, however, there has been limited published research on the impact bicarbonates have on Brettanomyces, especially in a brewing application. The objective of this project was to look at varying levels of added bicarbonates (0, 50, 75 and 100 mg/L) to identify correlations between bicarbonate content and the fermentation activity of Brettanomyces bruxellensis within beer. Two, 58.7 L brews with a target OG of 1.040 were brewed using a recirculating infusion mash system and mixed-together using a mash mixer to create one, 117.4 L batch to reduce variability. The batch was split into three, 37.9 L allotments and treated as triplicates. The beer was hopped to 20 IBUs using Bravo hops. Brettanomyces bruxellensis was propagated prior to being pitched at 1.2 million cells per degree Plato. After inoculation, the triplicates were stored at 21 °C until fermentation was completed. The reduction in gravity caused by the Brettanomyces was followed using a digital airlock and a benchtop densitometer. GC-MS was used for the anal. of the volatile compounds within the exptl. beers. Statistical anal. (p < 0.05) showed that there were significant differences between the fermentation activity, including flavor compound production, of the different batches brewed at different bicarbonate levels. The total concentration of volatiles ranged from 69.76 to 83.4 mg/L within the different beers. It was concluded that the varying levels of bicarbonates had an impact not only on the fermentation, but also on the volatile compounds Journal of the American Society of Brewing Chemists published new progress about Beer. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Computed Properties of 123-29-5.

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

Yu, Wenyue published the artcileInsight into the characteristics of cider fermented by single and co-culture with Saccharomyces cerevisiae and Schizosaccharomyces pombe based on metabolomic and transcriptomic approaches, SDS of cas: 106-32-1, the main research area is cider fermentation Saccharomyces Schizosaccharomyces metabolomic transcriptomic.

This study aimed to explore the effect of single and co-culture with Saccharomyces cerevisiae and Schizosaccharomyces pombe on the quality of cider. It was found that the interaction effect was observed in co-culture fermentation (CF) of cider with S. cerevisiae CICC 31084 and S. pombe CICC 1760. Meanwhile, aroma and taste quality of CF was significantly improved involving increase of fruity and floral aroma, which might result from the balance of esters, higher alcs. and terpenes. Moreover, the umami intensity of CF was enhanced, and the taste of sourness and astringency became weaker, which could be due to the higher content of umami amino acid and deacidification of malate. Addnl., a combined metabolic and RNA sequencing analyses revealed a clearer association between flavor quality of cider and gene expression of yeasts. Bioinformatic anal. revealed that the varying genes and metabolites were mainly involved in pathways of carbohydrate, amino acids, energy and terpenes backbone metabolism Finally, a metabolic pathway visualized the changes of significantly changed metabolites and differentially expressed genes in single and co-culture ciders. This study provided new insights into cider production and facilitated the application of co-culture fermentation technol. in fruits cidermaking.

LWT–Food Science and Technology published new progress about Amino acids Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, SDS of cas: 106-32-1.

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

Mascini, Marcello published the artcileHairpin DNA-AuNPs as molecular binding elements for the detection of volatile organic compounds, Related Products of esters-buliding-blocks, the main research area is volatile organic compound hairpin DNA gold nanoparticle; AuNPs; E-nose; Gas-sensors; Hairpin DNA; In-silico screening; Multivariate analysis; QCMs; VOCs.

Hairpin DNA (hpDNA) loops were used for the first time as mol. binding elements in gas anal. The hpDNA loops sequences of unpaired bases were studied in-silico to evaluate the binding vs. four chem. classes (alcs., aldehydes, esters and ketones) of volatile organic compounds (VOCs). The virtual binding score trend was correlated to the oligonucleotide size and increased of about 25% from tetramer to hexamer. Two tetramer and pentamer and three hexamer loops were selected to test the recognition ability of the DNA motif. The selection was carried out trying to maximize differences among chem. classes in order to evaluate the ability of the sensors to work as an array. HpDNA-AuNPs were deposited onto 20 MHz quartz crystal microbalances (QCMs) to form the gas piezoelec. sensors. An estimation of relative binding affinities was obtained using different amounts of eight VOCs (ethanol, 3-methylbutan-1-ol, 1-pentanol, octanal, nonanal, Et acetate, Et octanoate, and butane-2,3-dione) representative of the four chem. classes. In agreement with the predicted simulation, hexamer DNA loops improved by two orders of magnitude the binding affinity highlighting the key role of the hpDNA loop size. Using the sensors as an array a clear discrimination of VOCs on the basis of mol. weight and functional groups was achieved, analyzing the exptl. with principal components anal. (PCA) demonstrating that HpDNA is a promising mol. binding element for anal. of VOCs.

Biosensors & Bioelectronics published new progress about Aldehydes Role: BUU (Biological Use, Unclassified), BIOL (Biological Study), USES (Uses). 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

Clark, Caitlin published the artcileEffects of time and temperature during melanging on the volatile profile of dark chocolate, Product Details of C10H20O2, the main research area is dark chocolate temperature melanging volatile profile.

Chocolate made from small-batch production is known for distinct sensory properties that differentiate its products from large-scale production Specifically, small-batch processing includes a melanging step, a chocolate refining (a process involving time and temperature to refine texture and flavor) process that occurs in a stone wet-grinder. Chocolatiers understand that melanging is essential to flavor and overall quality, however the influence of melanging on the aroma chem. of the finished chocolate is anecdotal and largely uncharacterized. Here, we evaluated the effects of time and temperature of melanging on the volatile chem. of the finished chocolate. Specifically, chocolate aroma was profiled using HS/SPME-GC-MS for three different time and temperature combinations. A total of 88 compounds were annotated by mass spectrometry and included a diverse set of chem. classes such as pyrazines, aldehydes, terpenes, alcs., esters, and ketones. Anal. of variance (ANOVA), principal component anal. (PCA), and partial least squares anal. (PLS) revealed that the overall aroma profile was influenced by the type of melanging, and time had a greater effect than temperature Example compounds affected by time include 2-methylpropanal, di-Me sulfide, and benzaldehyde. Particle size was also measured for each sample. Majority particle size was found to be below 25 μ generally at all time points beyond 8 h. Anal. showed significant p-values for the temperature variable for several compounds, but significant p-values for the time variable were apparent for a greater number of compounds For compounds which showed dependency on both time and temperature, the p-value for the time variable was much smaller in most cases. Both PCA and OPLS analyses suggested the same trends. These data support that time is a critical factor in determining the aroma chem. of chocolate and affects a diverse set of known flavor active compounds

Scientific Reports published new progress about Aldehydes Role: BUU (Biological Use, Unclassified), BIOL (Biological Study), USES (Uses). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Product Details of C10H20O2.

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

Gao, Chang published the artcileThe process monitors of probiotic fermented sour cherry juice based on the HS-GC-IMS, SDS of cas: 140-11-4, the main research area is Lactobacillus probiotic fermented sour cherry juice heptanal ethyl acetate.

In this study, the sour cherry juice was fermented by lactic acid bacteria (L. rhamnosus GG) and the volatile compounds were identified by both GC-IMS (gas chromatog.-ion mobility spectrometry) and GC-MS (gas chromatogram-mass spectrum). Total 10 aldehydes,10 ketones, 10 esters, 8 alcs., 8 acids, and another 6 compounds were identified in the fermented cherry juice. In addition, PCA (principal component anal.) was applied to differentiate various fermented cherry juice. The first two principal components can explain 80% of the total variables, with PC2 67% and PC1 13% resp. Meanwhile, the variation of lactic acid bacteria number was measured during fermentation The peak intensity variation of the 4 compounds was significantly correlated with changes of lactic acid bacteria number (P < 0.05), with the highest correlation coefficient of 0.97. The acetoin can be an indicator for monitoring number variation of lactic acid bacteria (L. rhamnosus GG) in fermented cherry juice and this study can provide a novel method of monitoring probiotic fruit juice fermentation Microchemical Journal published new progress about Aldehydes Role: BUU (Biological Use, Unclassified), BIOL (Biological Study), USES (Uses). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, SDS of cas: 140-11-4.

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

Zhou, Dandan published the artcileInfluence of cold plasma on quality attributes and aroma compounds in fresh-cut cantaloupe during low temperature storage, Application of Benzyl acetate, the main research area is cold plasma food quality volatile compound cantaloupe lipoxygenase pathway.

In this study, cold plasma (CP) was applied in fresh-cut cantaloupe to investigate the changes of quality attributes and flavors. Results showed that CP maintained the qualities by suppressing the decrease of color, ascorbic acid, soluble solid contents and firmness in fresh-cut cantaloupe stored at 4°C for 10 days. Besides, CP significantly inhibited the decrease of aldehyde at the early storage but promoted the conversion of aldehydes into downstream volatiles afterwards. Total alcs. increased firstly but decreased afterwards and CP inhibited the decrease of alcs. at 4 d and 6 d mainly due to (Z)-3-none-1-ol accumulation. For the floral- and fruity-note aromas, most of esters, ketones and lactones increased at first and then decreased afterwards, and CP inhibited decrease of these three aromas. Furthermore, CP induced the activities of lipoxygenase, hydroperoxide lyase and alc. O-acyltransferase, indicating that CP promoted the conversion of aldehydes and alcs. into esters by enhancing the activities of these three key enzymes.

LWT–Food Science and Technology published new progress about Aldehydes Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 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

Rocabruno-Valdes, C. I. published the artcileCorrosion behavior of metallic materials in chicken fat-based biodiesel, Product Details of C9H18O2, the main research area is metallic material corrosion behavior chicken fat biodiesel.

The corrosion behavior of 304 type stainless steel, 1018 carbon steel pure Al and Cu in a chicken fatbased biodiesel during 180 days has been studied by using electrochem. impedance spectroscopy and electrochem. noise measurements. Cu and carbon steel had the highest corrosion rate. Both Al and 304 type stainless exhibited a localised, whereas Cu and carbon steel a mixed type of corrosion. Corrosion process was under charge transfer control for short exposure times, but under adsorption/desorption control for longer exposure times. The corrosiveness of the biodiesel resulted from a degradation in its physicochem. properties.

International Journal of Electrochemical Science published new progress about Biodiesel fuel Role: PRP (Properties), TEM (Technical or Engineered Material Use), USES (Uses). 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

Panzeri, V. published the artcileEvaluation of South African Chenin blanc wines made from six different trellising systems using a chemical and sensorial approach, Category: esters-buliding-blocks, the main research area is metabolome grape berry Chenin blanc wine beverage South Africa.

There are many ways of manipulating the components of grape berries and one of these is the implementation of a specific trellising system. This will affect light exposure in the bunch zone, air flow through the canopy, crop load, etc., and consequently the primary metabolites that contribute to the production of secondary compounds in wine. The aim of the present study was to characterize the grape musts and wines of Chenin blanc made from grapes of different trellising systems, using chem. fingerprinting of the samples and the check-all-that-apply method, combined with a quality scoring test. The results indicate that, while the wines could not be separated according to treatment from an aroma point of view, the grapes produced by different trellis systems resulted in wines characterised by differences in taste and mouthfeel. The present study shows that trellising systems can influence amino acids, yeast assimilable nitrogen, phenolic content and aroma compounds, as well as sensory characteristics. In this case study, wine quality was not affected by the trellising systems, with one exception. Fingerprinting using high-resolution mass spectrometry proved to be a successful tool to sep. the samples according to the systems.

South African Journal of Enology and Viticulture published new progress about Alcohols Role: BUU (Biological Use, Unclassified), BIOL (Biological Study), USES (Uses). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Category: esters-buliding-blocks.

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