Month: December 2022

Park, Min Kyung published the artcileComparison of volatile profiles in Fagopyrum esculentum (buckwheat) soksungjang prepared with different starter cultures during fermentation, Related Products of esters-buliding-blocks, the main research area is Fagopyrum pentanoic acid dimethyl carbonate Bacillus Lactobacillus food fermentation; Fermentation; Partial least squares-discriminant analysis; Soksungjang; Soybean koji; Volatile profiles.

This study investigated the differences and changes in the volatile profiles of buckwheat soksungjang (BS) inoculated with multiple microbial starters (Lactobacillus brevis + Aspergillus oryzae, BS-LA vs. Lactobacillus brevis + Bacillus amyloliquefaciens, BS-LB) during fermentation using SPME coupled with GC-MS and partial least square-discriminant anal. BS samples fermented for 5 wk could be differentiated from other BS samples with shorter fermentation periods, and the BS-LA and BS-LB samples fermented for 5 wk were separated Acids, benzenes, and esters were main volatile compounds in both BS samples, however, their differences and changes were varied. The increase of 3-methylbutanoic acid was bigger in BS-LB than BS-LA, while the contents of 2- and 3-methylbutanal were relatively higher in BS-LA than BS-LB. Furthermore, the contents of esters of BS-LA significantly increased during fermentation These results indicate that the volatile profiles of BS samples depend on the fermentation periods and the combination of microbial starters.

Food Science and Biotechnology published new progress about Aspergillus oryzae. 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

Jin, Juhui published the artcileCharacteristics of sourdough bread fermented with Pediococcus pentosaceus and Saccharomyces cerevisiae and its bio-preservative effect against Aspergillus flavus, Computed Properties of 123-29-5, the main research area is sourdough bread fermentation Pediococcus Saccharomyces Aspergillus preservative; Antifungal activity; Bread; Pediococcus pentosaceus; Saccharomyces cerevisiae; Sourdough.

Six lactic acid bacteria (LAB) and four yeast strains were isolated from Pyeongchang spontaneous sourdough. In combination with the segregated Saccharomycopsis fibuligera and Saccharomyces cerevisiae, Pediococcus pentosaceus was employed for sourdough bread starters because of its antifungal action against Aspergillus flavus. The sourdough bread fermented with P. pentosaceus and S. cerevisiae displayed 56.4% ± 5.5% antifungal movement counter to A. flavus expansion at 96 h. The concentration of lactic and acetic acids in the sourdough bread was 4.5- and 1.6-folds above the control bread, resp., contributing to the balanced sensory properties with a fermentation quotient (FQ) of 2.08-2.86. SPME- GC/MS newly distinguished twenty-two volatile compounds including six aldehydes, five alcs., one phenol, three ketones, one acid, and six esters. The results suggest the P. pentosaceus and S. cerevisiae combination as promising sourdough starters for making enhanced quality bread free of preservatives.

Food Chemistry published new progress about Aspergillus flavus. 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

Choinska, Renata published the artcileBiocontrol ability and volatile organic compounds production as a putative mode of action of yeast strains isolated from organic grapes and rye grains, Application of Ethyl nonanoate, the main research area is organic grape rye grain yeast; Anti-mold activity; Biofungicide; Plant pathogens; Yeast antagonist.

Abstract: The inhibiting activity of three yeast strains belonging to Pichia kudriavzevii, Pichia occidentalis, and Meyerozyma quilliermondii/Meyerozyma caribbica genera against common plant pathogens representing Mucor spp., Penicillium chrysogenum, Penicillium expansum, Aspergillus flavus, Fusarium cereals, Fusarium poae, as well as Botrytis cinerea genera was investigated. The yeast strains tested had a pos. impact on growth inhibition of all target plant pathogens. The degree of inhibition was more than 50% and varied depending on both the yeast antagonist and the mold. Et esters of medium-chain fatty acids, phenylethyl alc., and its acetate ester prevailed among the analyzed volatile organic compounds (VOCs) emitted by yeasts in the presence of the target plant pathogens. Due to the method used, assuming no contact between the antagonist and the pathogen, the antagonistic activity of the yeast strains studied resulted mainly from the production of biol. active VOCs. Moreover, the antagonistic activity was not only restricted to a single plant pathogen but effective towards molds of different genera, making the yeast strains studied very useful for potential application in biol. control.

Antonie van Leeuwenhoek published new progress about Aspergillus flavus. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Application of Ethyl nonanoate.

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

Choinska, Renata published the artcileBiocontrol ability and volatile organic compounds production as a putative mode of action of yeast strains isolated from organic grapes and rye grains, Safety of Ethyl pentadecanoate, the main research area is organic grape rye grain yeast; Anti-mold activity; Biofungicide; Plant pathogens; Yeast antagonist.

Abstract: The inhibiting activity of three yeast strains belonging to Pichia kudriavzevii, Pichia occidentalis, and Meyerozyma quilliermondii/Meyerozyma caribbica genera against common plant pathogens representing Mucor spp., Penicillium chrysogenum, Penicillium expansum, Aspergillus flavus, Fusarium cereals, Fusarium poae, as well as Botrytis cinerea genera was investigated. The yeast strains tested had a pos. impact on growth inhibition of all target plant pathogens. The degree of inhibition was more than 50% and varied depending on both the yeast antagonist and the mold. Et esters of medium-chain fatty acids, phenylethyl alc., and its acetate ester prevailed among the analyzed volatile organic compounds (VOCs) emitted by yeasts in the presence of the target plant pathogens. Due to the method used, assuming no contact between the antagonist and the pathogen, the antagonistic activity of the yeast strains studied resulted mainly from the production of biol. active VOCs. Moreover, the antagonistic activity was not only restricted to a single plant pathogen but effective towards molds of different genera, making the yeast strains studied very useful for potential application in biol. control.

Antonie van Leeuwenhoek published new progress about Aspergillus flavus. 41114-00-5 belongs to class esters-buliding-blocks, name is Ethyl pentadecanoate, and the molecular formula is C17H34O2, Safety of Ethyl pentadecanoate.

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

Lee, Joonbum published the artcileCopolymerization of zwitterionic carboxybetaine and various hydrophobic groups to optimize antifouling and biocompatible properties, Recommanded Product: Dodecyl 2-methylacrylate, the main research area is zwitterionic carboxybetaine hydrophobic group copolymerization antifouling biocompatible property optimization.

Zwitterionic polymers including carboxybetaine derivatives are widely utilized as biocompatible antifouling materials in the way of copolymerization for the enhanced functionality. The aim of this study was to optimize the structure of copolymer in order to present a versatile antifouling property against both polar and nonpolar foulants as well as biocompatibility. Copolymers of zwitterionic carboxybetaine and several hydrophobic monomers were synthesized and coated on the glass substrate by a simple dip-coating method. The antifouling performance against polar and nonpolar foulants, adhesion property of cells and platelets on the coated surfaces were investigated. The optimal copolymer-coated surface with low fouling and fewer thrombotic events was shown to be a carboxybetaine copolymer in combination with the trimethylsiloxy group. This result suggests that elaborate copolymerization makes it possible to create a versatile antifouling surface using a simple and practical method without compromising the functionality of each monomer.

Journal of Industrial and Engineering Chemistry (Amsterdam, Netherlands) published new progress about Antifouling agents. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Recommanded Product: Dodecyl 2-methylacrylate.

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

Demling, Philipp published the artcileSelection of a recyclable in situ liquid-liquid extraction solvent for foam-free synthesis of rhamnolipids in a two-phase fermentation, Application In Synthesis of 110-42-9, the main research area is liquid extraction solvent rhamnolipids two phase fermentation.

Excessive foaming causes instabilities in fermentation processes, particularly when producing biosurfactants, which can be overcome by intensifying the fermentation via insitu product recovery. A reductive, multi-step approach for selecting organic solvents for an in situ liquid-liquid extraction of rhamnolipids produced by recombinant Pseudomonas putida KT2440 was developed. (1) A database consisting of physicochem. parameters for 183 solvents was composed, allowing a pre-selection by setting resp. thresholds. (2) The number of solvents was reduced by evaluating their extraction efficiencies regarding rhamnolipids in cell-free cultivation broth and their impact on the growth of P. putida KT2440. (3) The most promising solvent was characterized regarding phase separation, pH-dependency of the extraction, and applicability of back-extraction for product recovery and solvent regeneration. The overall performance was assessed in two-phase (fed-)batch fermentations in lab-scale stirred-tank reactors. The solvent selection approach revealed Et decanoate to be a highly suitable and sustainable solvent for the in situ liquid-liquid extraction of rhamnolipids. During the final two-phase fed-batch fermentation, 30 g L-1 of produced rhamnolipids accumulated in the organic phase. Integrating extraction and increasing the partition coefficient by moderately lowering the pH prevented foaming during fermentation, thus resolving the initial process instability. Rapid phase separation and back-extractability allowed product recovery and solvent recycling. The here presented reductive, multi-step solvent selection approach was successfully applied to establish a two-phase fermentation producing rhamnolipids by engineered P. putida KT2440, resolving the foaming challenge. The approach can serve as a blueprint for selecting solvents for in situ liquid-liquid extractions in bioprocesses.

Green Chemistry published new progress about Antifoaming agents. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Application In Synthesis of 110-42-9.

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

Zhao, Shuyue published the artcileScreening and Matching Amphiphilic Cationic Polymers for Efficient Antibiosis, Safety of Dodecyl 2-methylacrylate, the main research area is antibacterial cationic copolymer quaternary ammonium salt chain length PEGylation.

The amphiphilic cationic polymers that mimic antimicrobial peptides have received increasing attention due to their excellent antibacterial activity. However, the relationship between the structure of cationic polymers and its antibacterial effect remains unclear. In our current work, a series of PEG blocked amphiphilic cationic polymers composed of hydrophobic alkyl-modified and quaternary ammonium salt (QAS) moieties have been prepared The structure-antibacterial activity relationship of these cationic polymers was investigated against E. coli and S. aureus, including PEGylation, random structure, mol. weights, and the content and lengths of the hydrophobic alkyl side chains. The results indicated that PEGylated random amphiphilic cationic copolymer (mPB35/T57) showed stronger antibacterial activity and better biocompatibility than the random copolymer without PEG (PB33/T56). Furthermore, mPB35/T57 with appropriate mole fraction of alkyl side chains (falkyl = 0.38), d.p. (DP = 92), and four-carbon hydrophobic alkyl moieties was found to have the optimal structure that revealed the best antibacterial activities against both E. coli (MIC = 8μg/mL, selectivity > 250) and S. aureus (MIC = 4μg/mL, selectivity > 500). More importantly, mPB35/T57 could effectively eradicate E. coli biofilms by killing the bacteria embedded in the biofilms. Therefore, the structure of mPB35/T57 provided valuable information for improving the antibacterial activity of cationic polymers.

Biomacromolecules published new progress about Antibiofilm agents. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Safety of Dodecyl 2-methylacrylate.

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

Cortes-Martinez, Fernando published the artcileThe ripeness stage but not the cultivar influences the attraction of Anastrepha obliqua to guava, Recommanded Product: Ethyl octanoate, the main research area is ripeness Anastrepha obliqua guava fruit volatile electroantennog detector.

The West Indian fruit fly, Anastrepha obliqua (Macquart), infests a wide diversity of tropical fruit. Previous studies suggest that A. obliqua adults are attracted to volatile compounds common in different hosts. However, to date, most studies have used ripe fruit for the identification of attractive compounds In this study, we investigated the attraction of sexually mature A. obliqua females and males to two cultivars and three ripening stages of guava. We also identified the attractive compounds to A. obliqua by combined gas chromatog.-electroantennog. detector (GC-EAD) and gas chromatog.-mass spectrometry (GC-MS) and evaluated the biol. activity of the identified compounds in field-cage tests. We found that individuals of both sexes of A. obliqua showed no preference to the volatiles of either of the two cultivars of guava evaluated. In contrast, flies were more attracted to ripe and half-ripe fruit than to unripe ones. GC-EAD analyzes of extracts of ripe “”Creole”” or “”Thai”” cultivars identified six compounds that elicited antennal responses by A. obliqua females and males. The compounds were identified by GC-MS as Et butyrate, cis-3-hexen-1-ol, Et hexanoate, cis-3-hexenyl acetate, Et benzoate, and Et octanoate. Half-ripe guava emit Et butyrate, cis-3-hexen-1-ol, Et hexanoate, and cis-3-hexenyl acetate, while only traces of cis-3-hexenyl-acetate were found in unripe guava. Field-cage tests with synthetic standards confirmed that the compounds identified are responsible for the attraction of A. obliqua flies to ripe guava.

Chemoecology published new progress about Anastrepha obliqua. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Recommanded Product: Ethyl octanoate.

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

Wu, Hongguo published the artcileHot water-promoted catalyst-free reductive cycloamination of (bio-)keto acids with HCOONH4 toward cyclic amides, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is keto acid ammonium formate tandem reductive cycloamination; cyclic amide preparation.

HCOONH4 was demonstrated to be capable of acting as both hydrogen and nitrogen source in the absence of any catalyst and additive for the reductive cycloamination of bio-based levulinic acid (LA) to 5-methyl-2-pyrrolidone (MPL) with more than 90% in just 60 min at 180°. Pressurized hot water remarkably enabled the reaction efficiency and rate by promoting the hydrolysis of HCOONH4 to liberated ammonia and formic acid for the cascade reactions and this catalyst-free protocol was also applicable to the efficient synthesis of various cyclic amides from relevant keto acids. Moreover, the reaction pathways were investigated by conducting deuterium-labeling experiments and kinetic studies of selected reactions.

Journal of Supercritical Fluids published new progress about Amidation kinetics. 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

Najar, Basma published the artcileChemical Composition and in Vitro Cytotoxic Screening of Sixteen Commercial Essential Oils on Five Cancer Cell Lines, Application of Benzyl acetate, the main research area is essential oil composition cytotoxic screening; K562; MCF7; MDA-MB-231; SHSY-5Y; T47D; cytotoxicity.

The in vitro cytotoxic activity on human cancer cell lines of sixteen com. EOs such as Aloysia citriodora, Boswellia sacra, Boswellia serrata, Cinnamomum zeylanicum, Cistus ladanifer, Citrus × aurantium, Citrus limon, Citrus sinensis, Cymbopogon citratus, Foeniculum vulgare, Illicium verum, Litsea cubeba, Satureja montana, Syzygium aromaticum, Thymus capitatus and Thymus vulgaris was performed using the MTT reduction assay. The screening was carried out on human cancer cells of breast adenocarcinoma (MCF7, T47D and MDA-MB-231), chronic myelogenous erythroleukemia (K562) and neuroblastoma cell lines (SH-SY5Y). C. zeylanicum and L. cubeba EOs were the most active on almost all the cell lines studied and thus could be promising as an anticancer agent. These two species showed a difference in their composition even though they belong to the Lauraceae family. Almost 57% of the true cinnamon composition was made of (E)-cinnamaldehyde, while L. cubeba showed citral as the major compound (68.9%). The K562 cells were the most sensitive to these oils with an IC50 ranging from 5.2 parts-per million (ppm) (C. zeylanicum) to 11.1 ppm (L. cubeba). The latter oil also showed an important cytotoxicity on MDA-MB-231 (13.4 ppm).

Chemistry & Biodiversity published new progress about Aloysia citriodora. 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