Month: December 2022

He, Fei published the artcileExploration of key aroma active compounds in strong flavor Baijiu during the distillation by modern instrument detection technology combined with multivariate statistical analysis methods, Application In Synthesis of 123-29-5, the main research area is hexyl hexanoate phenylacetaldehyde pentanoic acid ethyl linolenate.

Liquid-liquid microextraction (LLME) combined with gas chromatog.-mass spectrometry (GC-MS) and headspace-gas chromatog.-ion mobility spectrometry (HS-GC-IMS) were used to detect the variations in volatile compounds during the distillation process of strong flavor raw Baijiu. The 3D fingerprint spectrum clearly showed a variation in volatile compounds from different distillation stages, and most alc.-soluble and low mol. weight compounds showed a downward trend with the extension of distillation time, but water-soluble, high mol. weight and high boiling compounds showed the opposite result. Then, 50 aroma compounds were sniffed and identified by gas chromatog.-olfactometry-mass spectrometry (GC-O-MS) and multivariate statistical anal. including principal component anal. (PCA) and partial least squares discriminant anal. (PLS-DA) confirmed four aroma active markers related to classification. Finally, the receiver operating characteristic (ROC) curve was further used to verify that Et butanoate and Et hexanoate were the most effective difference marker to distinguish the head Baijiu samples and butanoic acid was the most effective difference marker for distinguishing the heart Baijiu samples from the tail Baijiu samples.

Journal of Food Composition and Analysis published new progress about Acids Role: ANT (Analyte), FFD (Food or Feed Use), ANST (Analytical Study), BIOL (Biological Study), USES (Uses). 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Application In Synthesis of 123-29-5.

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

He, Jun published the artcileA new type of triptycene-based stationary phases with alkylated benzimidazolium cations for gas chromatographic separations, Application In Synthesis of 111-11-5, the main research area is triptycene benzimidazolium cation gas chromatog stationary phase separation.

Favorable physicochem. properties and unique mol. recognition capability endow triptycene-based materials with good potential as stationary phases for gas chromatog. (GC). This work reports a new type of triptycene-based materials functionalized by three benzimidazolium cations with different peripheral alkyl lengths (denoted as TP-3Bim-5C and TP-3Bim-12C) and their GC separation performance. As a result, they shared high resolving performance for the naphthalene isomers but differed for the benzene derivatives with varying polarity. Moreover, their capillary columns exhibited good repeatability and thermal stability. This work presents a facile strategy for tailoring the selectivity of the TP-based stationary phases and demonstrates their promising future for chromatog. anal.

Chinese Chemical Letters published new progress about Gas chromatographic capillary columns. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Application In Synthesis of 111-11-5.

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

Miyazawa, Toshifumi published the artcileResolution of non-protein amino acids via the microbial protease-catalyzed enantioselective hydrolysis of their N-unprotected esters, Related Products of esters-buliding-blocks, the main research area is amino acid ester resolution microbial protease enantioselective hydrolysis kinetics.

In the Aspergillus oryzae protease-catalyzed ester hydrolysis, substitution of N-unprotected amino acid esters for the corresponding N-protected amino acid esters resulted in a large enhancement of the hydrolysis rate, while the enantioselectivity was deteriorated strikingly when the substrates employed were the conventional Me esters. This difficulty was overcome by employing esters bearing a longer alkyl chain such as the iso-Bu ester. Utilizing this ester, amino acids carrying an aromatic side chain were resolved with excellent enantioselectivities (E=50 to >200). With amino acids bearing an aliphatic side chain also, good results in terms of the hydrolysis rate and enantioselectivity were obtained by employing such an ester as the iso-Bu ester. Moreover, the enantioselectivity proved to be enhanced further by conducting the reaction at low temperature This procedure was applicable to the case where the enantioselectivity was not high enough even by the use of the iso-Bu ester.

Tetrahedron published new progress about Aspergillus oryzae. 10047-10-6 belongs to class esters-buliding-blocks, name is Methyl 2-aminopentanoate hydrochloride, and the molecular formula is C6H14ClNO2, Related Products of esters-buliding-blocks.

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

Rodriguez, Jessica published the artcileAu(I)/Au(III) Catalytic Allylation Involving π-Allyl Au(III) Complexes, Formula: C10H10O2, the main research area is branched allylated indole preparation; allyl compound indole cross coupling gold catalyst.

A (MeDalphos)AuCl complex was found to efficiently catalyze the cross-coupling of indoles and allyl acetates/alcs. The reaction tolerated many functional groups and selectively affords the branched C3-allylated products from both α- and γ-substituted allyl substrates. It took the advantage of the hemilabile character of the PN ligand. The C(sp2)-C(sp3) coupling operated via a Au(I)/Au(III) redox cycle and involves a dicationic π-allyl Au(III) complex as a key intermediate. In this case, the allyl moiety adopted an asym. σ + π-coordination mode, as substantiated by NMR spectroscopy and d. functional theory (DFT) calculations

ACS Catalysis published new progress about Cross-coupling reaction. 583-04-0 belongs to class esters-buliding-blocks, name is Allyl benzoate, and the molecular formula is C10H10O2, Formula: C10H10O2.

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

Khvalbota, Liudmyla published the artcileSimultaneous distillation-solvent extraction gas chromatography-mass spectrometry analysis of Tokaj Muscat Yellow wines, Synthetic Route of 106-32-1, the main research area is tokaj muscat yellow wine distillation solvent extraction GC MS.

In the present study, simultaneous distillation-solvent extraction conditions were optimized for the extraction of organic compounds from naturally sweet Tokaj wines. Solvent selection, optimization of phase ratio, time of extraction, and addition of modifier were studied. The volatile organic compounds profile of Slovak Tokaj Muscat Yellow wine was characterized using simultaneous distillation-solvent extraction gas chromatog.-mass spectrometry. Identified volatile organic compounds belonged to terpenes, esters, higher alcs., volatile acids, lactones, and furanoids. At optimized simultaneous distillation-solvent extraction conditions, anal. parameters such as linearity (R2 > 0.98), repeatability (from 3.33% to 10.39%), quantitation, and detection limits for selected compounds (Et hexanoate, geraniol, linalool oxide, α-terpineol, 1-octanol, geranyl acetate, nerol, benzyl alc., benzaldehyde, 1,2-dihydrolinalool, 4-terpineol, and di-Et succinate) were estimated

Separation Science plus published new progress about Botrytis. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Synthetic Route of 106-32-1.

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

Xiang, Xiao-Feng published the artcileCharacterization of odor-active compounds in the head, heart, and tail fractions of freshly distilled spirit from Spine grape (Vitis davidii Foex) wine by gas chromatography-olfactometry and gas chromatography-mass spectrometry, Application of Methyl octanoate, the main research area is Vitis head heart tail fraction gas chromatog olfactometry MS; Aroma; Aroma extract dilution analysis; Distillation cut; Gas chromatography-olfactometry-mass spectrometry; Spine grape (Vitis davidii Foex); Wine spirit.

Differences in key odor-active volatile compounds among the head, heart, and tail fractions of freshly distilled spirits from Spine grape (Vitis davidii Foex) wine were identified for the first time by gas chromatog.-olfactometry and gas chromatog.-mass spectrometry. Results from aroma extract dilution anal. (AEDA) showed that there were 34, 45, and 37 odor-active compounds in the head, heart and tail fractions, resp. Besides, 20, 22, and 17 quantified compounds, resp., showed odor activity values (OAVs) > 1. The head fraction was characterized by fruity, fusel/solvent notes owing to higher concentrations of higher alcs. and esters, while the tail fraction had more intense smoky/animal, sweaty/fatty attributes due to higher concentrations of volatile phenols and fatty acids. Finally, the heart fraction was characterized by Et octanoate, Et hexanoate, Et 3-phenylpropanoate, Et cinnamate, isoamyl alc., guaiacol, 4-ethylguaiacol, 4-vinylguaiacol, 2,3-butanedione, and (E)-β-damascenone. Furthermore, observation of the distillation progress indicated that different volatiles with various b.ps. and solubilities followed diverse distillation patterns: concentrations of most esters, higher alcs., terpenes and C13-norisoprenoids decreased, while concentrations of volatile phenols, fatty acids and some aromatic compounds increased during distillation As a result, their final concentrations in the three distillate fractions varied significantly.

Food Research International published new progress about Boiling point. 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

Hang, Shuting published the artcileLactobacillus plantarum ZJ316 improves the quality of Stachys sieboldii Miq. pickle by inhibiting harmful bacteria growth, degrading nitrite and promoting the gut microbiota health in vitro, Name: Ethyl nonanoate, the main research area is Lactobacillus plantarum Stachys sieboldii pickle quality nitrite gut microbiota.

Microbial contamination and nitrite accumulation are the two major concerns in the quality control of fermented vegetables. In the present study, a lactic acid bacteria strain Lactobacillus plantarum ZJ316 (ZJ316) was inoculated during Stachys sieboldii Miq. (SSM) fermentation, and the effects of ZJ316 on the quality and bacterial community of SSM during fermentation were investigated. It was observed that ZJ316 could avoid the occurrence of the nitrite peak and maintain the nitrite content of fermented SSM at a low level. Gas chromatog.-mass spectrometry (GC-MS) results suggested that ZJ316 gave good flavor to the fermented SSM. 16S rDNA sequencing showed that Firmicutes was the dominant flora after ZJ316 inoculation, and the abundance of Proteobacteria decreased at the same time. At the level of the genus, SSM fermented by ZJ316 had a more obvious inhibitory effect on Pseudomonas on the 7th day compared with the naturally fermented SSM. Addnl., the effect of ZJ316-fermented SSM on gut microbiota modulation was also evaluated using an in vitro fecal fermentation system. The results revealed that ZJ316 had a relatively subtle influence on intestinal communities with a potentially pos. impact on probiotics such as Lactobacillus and Bifidobacterium and a neg. impact on Enterobacteriaceae. Furthermore, SSM fermented by ZJ316 promoted the production of short-chain fatty acids (SCFAs) in the human intestine. These results demonstrate that L. plantarum ZJ316 can be used as a good starter in the fermentation process of pickles.

Food & Function published new progress about Bifidobacterium. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Name: Ethyl nonanoate.

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

Pirrone, Antonino published the artcileInfluence of indigenous Hanseniaspora uvarum and Saccharomyces cerevisiae from sugar-rich substrates on the aromatic composition of loquat beer, Application of Ethyl octanoate, the main research area is Hanseniaspora Saccharomyces loquat beer aromatic composition; Alcoholic fermentation; Beer aroma; Hanseniaspora uvarum; Loquat beer; Saccharomyces cerevisiae; Volatile organic compounds.

The demand for unique and exclusive food products and beverages is constantly on the increase. One of the products that mostly evolved to encounter market dynamics in the last decade is craft beer. For a long time, craft breweries have included fruit in beer production to enrich flavor and aroma profile of different beer styles. In this study, for the first time, the use of Saccharomyces and non-Saccharomyces yeast strains isolated from high-sugar matrixes (manna and fermented honey byproducts) were investigated to diversify fruit craft beer production, in order to improve the fermentation process and highlight the complexity of aroma profiles generated during alc. fermentation Two yeast strains, Hanseniaspora uvarum YGA34 and Saccharomyces cerevisiae MN113, were tested as co-starters and starters for their beer production capacity. Com. yeast strain US-05 was used as control. Loquat juice was added at the end of primary alc. fermentation in all trials. Interestingly, S. cerevisiae MN113 consumed sugars faster than control strain S. cerevisiae US-05, including maltose, even in the case of sequential inoculation. This strain showed an excellent ability to consume rapidly sugars present. All strains showed their concentrations ranged between 5 and 8 Log cycles during fermentation The absence of off-odours and the improvement of aromatic perception were observed in exptl. trials involving the use of S. cerevisiae MN113 as a monoculture and in sequential combination with H. uvarum YGA34. Esters and alcs. were the most abundant compounds emitted from the beers. The beers produced with sequential inoculation of H. uvarum YGA34 and S. cerevisiae MN113 or US-05 are characterised by a higher ester and lower alc. concentration These two unconventional yeast strains from high sugar matrixes showed great technol. properties, representing promising co-starters and starter during craft fruit beer production

International Journal of Food Microbiology published new progress about Beer (loquat). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Application of Ethyl octanoate.

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

Pirrone, Antonino published the artcileInfluence of indigenous Hanseniaspora uvarum and Saccharomyces cerevisiae from sugar-rich substrates on the aromatic composition of loquat beer, HPLC of Formula: 123-29-5, the main research area is Hanseniaspora Saccharomyces loquat beer aromatic composition; Alcoholic fermentation; Beer aroma; Hanseniaspora uvarum; Loquat beer; Saccharomyces cerevisiae; Volatile organic compounds.

The demand for unique and exclusive food products and beverages is constantly on the increase. One of the products that mostly evolved to encounter market dynamics in the last decade is craft beer. For a long time, craft breweries have included fruit in beer production to enrich flavor and aroma profile of different beer styles. In this study, for the first time, the use of Saccharomyces and non-Saccharomyces yeast strains isolated from high-sugar matrixes (manna and fermented honey byproducts) were investigated to diversify fruit craft beer production, in order to improve the fermentation process and highlight the complexity of aroma profiles generated during alc. fermentation Two yeast strains, Hanseniaspora uvarum YGA34 and Saccharomyces cerevisiae MN113, were tested as co-starters and starters for their beer production capacity. Com. yeast strain US-05 was used as control. Loquat juice was added at the end of primary alc. fermentation in all trials. Interestingly, S. cerevisiae MN113 consumed sugars faster than control strain S. cerevisiae US-05, including maltose, even in the case of sequential inoculation. This strain showed an excellent ability to consume rapidly sugars present. All strains showed their concentrations ranged between 5 and 8 Log cycles during fermentation The absence of off-odours and the improvement of aromatic perception were observed in exptl. trials involving the use of S. cerevisiae MN113 as a monoculture and in sequential combination with H. uvarum YGA34. Esters and alcs. were the most abundant compounds emitted from the beers. The beers produced with sequential inoculation of H. uvarum YGA34 and S. cerevisiae MN113 or US-05 are characterised by a higher ester and lower alc. concentration These two unconventional yeast strains from high sugar matrixes showed great technol. properties, representing promising co-starters and starter during craft fruit beer production

International Journal of Food Microbiology published new progress about Beer (loquat). 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, HPLC of Formula: 123-29-5.

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

He, Zhanglan published the artcileTandem Solid-Phase Extraction Columns for Simultaneous Aroma Extraction and Fractionation of Wuliangye and Other Baijiu, Computed Properties of 106-32-1, the main research area is Wuliangye Baijiu tandem solid phase aroma extraction; Wuliangye baijiu; fatty acid esters; polar compounds; simultaneous extraction and fractionation; tandem SPE columns.

Wuliangye baijiu is one of the most famous baijiu in China, with a rich, harmonic aroma profile highly appreciated by consumers. Thousands of volatiles have been identified for the unique aroma profile. Among them, fatty acid esters have been identified as the main contributors to the aroma profile. In addition, many non-ester minor compounds, many of which are more polar than the esters, have been identified to contribute to the characteristic aroma unique to Wuliangye baijiu. The anal. of these minor compounds has been challenging due to the dominance of esters in the sample. Thus, it is desirable to fractionate the aroma extract into subgroups based on functional group or polarity to simplify the anal. This study attempts a new approach to achieve simultaneous volatile extraction and fractionation using tandem LiChrolut EN and silica gel solid-phase extraction (SPE) columns. A baijiu sample (10 mL, diluted in 40 mL of water) was first passed through the LiChrolut EN (1.0 g) column. The loaded LiChrolut EN column was then dried with air and coupled with a silica gel (5.0 g) SPE column with anhydrous Na2SO4 (10.0 g) in between. The volatile compounds were eluted from the LiChrolut EN column and simultaneously fractionated on the silica gel column based on polarity. The simultaneous extraction and fractionation technique enabled the fractionations of all fatty acid esters into less polar fractions. Fatty acids, alcs., pyrazines, furans, phenols, hydroxy esters, and other polar compounds were collected in more polar fractions. This technique was used to study the volatile compounds in Wuliangye, Moutai, and Fengjiu baijiu. In addition to fatty acid esters, many minor polar compounds, including 2,6-dimethylpyrazine, 2-ethyl-6-methylpyrazine, 2-ethyl-3,5-dimethylpyrazine, p-cresol, and 2-acetylpyrrole, were unequivocally identified in the samples. The procedure is fast and straightforward, with low solvent consumption.

Molecules published new progress about Baijiu. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Computed Properties of 106-32-1.

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