Tag: M.W=150-200

Suo, Hang published the artcileKinetic study of the ultrasonically assisted ethyl esterification of fatty acids using an immobilized lipase catalyst and deep eutectic solvent, COA of Formula: C11H22O2, the main research area is kinetic ultrasonically assisted ethyl esterification fatty acid immobilized lipase.

In this study, the esterification reaction kinetics of biodiesel (fatty acid Et ester) prepared from waste oil (cooking oil waste and oleic acid mixture) and ethanol at three different temperatures (313.15, 323.15, and 333.15 K) by lipase (Novozym 435) catalyzed. It was investigated under three different reaction systems of ultrasonic (without DES), deep eutectic solvent (DES, choline chloride: glycerol mole ratio = 1:2, without ultrasonic), and ultrasonic-assisted DES. The results showed that the combination of the ultrasonic and DES had a synergistic effect on the enzymic reaction. The activation energy of the reaction was the smallest (24.82 kJ/mol) compared to the other two processes (ultrasonic: 34.38 kJ/mol and DES: 29.43 kJ/mol), and the reaction was easier to proceed. Subsequently, the reusability of lipase and the composition of the product were studied. The results showed that the conversion rate of fatty acid Et ester decreased from the initial 93.33% to 80.31% when the experiment was repeated five times in the ultrasonic-assisted DES system. The Et ester composition of the product was mainly concentrated between C14 and C24, and the proportion of Et oleate was the most abundant.

International Journal of Chemical Kinetics published new progress about Acoustic devices. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, COA of Formula: C11H22O2.

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

Park, Kye Chung published the artcileOlfactory Receptor Neurons for Plant Volatiles and Pheromone Compounds in the Lucerne Weevil, Sitona discoideus, SDS of cas: 140-11-4, the main research area is olfactory receptor neuron plant volatile pheromone compound Sitona; 4-methyl-3,5- heptanedione; 5-hydroxy-4-methyl-3-heptanone; Host-plant volatiles; Olfactory sensilla; Pheromone; Single-sensillum recording.

Abstract: Antennal olfactory receptor neurons (ORNs) for pheromone-related and plant volatile compounds were identified and characterized in the lucerne weevil, Sitona discoideus (Gyllenhal), using the single sensillum recording technique. Our study using five pheromone-related compounds and 42 plant volatile compounds indicates that S. discoideus have highly specialized ORNs for pheromone and plant volatile compounds Different groups of ORNs present in both males and females of S. discoideus were highly sensitive to 4-methylheptane-3,5-dione (diketone) and four isomers (RR, RS, SR and SS) of 5-hydroxy-4-methylheptan-3-one, resp. Our results also indicate that male S. discoideus, using the sensory input from antennal ORNs, can distinguish both diketone and the RR-isomer from others, and RS- and SS-isomers from others, although it was unclear if they can distinguish between RS-isomer and SS-isomer, or between diketone and the SR-isomer. It also appeared that female S. discoideus could distinguish between RS-isomer and SS-isomers. The antennae of S. discoideus thus contain sex-specific sets of ORNs for host- and non-host plant volatile compounds Both sexes of S. discoideus have highly sensitive and selective ORNs for some green-leaf volatiles, such as (Z)-3-hexenol and (E)-2-hexenal. In contrast, male antennae of S. discoideus house three distinct groups of ORNs specialized for myrcene and (E)-β-ocimene, 2-phenylethanol, and phenylacetaldehyde, resp., whereas female antennae contain three groups of ORNs specialized for (±)-linalool and (±)-α-terpineol, myrcene and (E)-β-ocimene, (±)-1-octen-3-ol, and 3-octanone. Our results suggest that S. discoideus use a multi-component pheromone communication system, and a sex-specific set of ORNs with a narrow range of response spectra for host-plant location.

Journal of Chemical Ecology published new progress about Action potential. 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

Ligor, Tomasz published the artcileAnalysis of VOCs in Urine Samples Directed towards of Bladder Cancer Detection, Name: Benzyl acetate, the main research area is bladder cancer volatile organic compound urine analysis; GC×GC TOF MS; bladder cancer; urine analyses; volatile organic compounds.

Bladder cancer is one of most common types of cancer diagnosed in the genitourinary tract. Typical tests are costly and characterized by low sensitivity, which contributes to a growing interest in volatile biomarkers. Head space solid phase microextraction (SPME) was applied for the extraction of volatile organic compounds from urine samples, and gas chromatog. time of flight mass spectrometry (GCxGC TOF MS) was used for the separation and detection of urinary volatiles. A cohort of 40 adult patients with bladder cancer and 57 healthy persons was recruited. Different VOC profiles were obtained for urine samples taken from each group. Twelve compounds were found only in the samples from theBC group.The proposed candidate biomarkers are butyrolactone; 2-methoxyphenol; 3-methoxy-5-methylphenol; 1-(2,6,6-trimethylcyclohexa-1,3-dien-1-yl)-2-buten-1-one; nootkatone and 1-(2,6,6-trimethyl-1-cyclohexenyl)-2-buten-1-one.Since most of the studies published in the field are proving the potential of VOCs detected in urine samples for the screening and discrimination of patients with bladder cancer from healthy, but rarely presenting the identity of proposed biomarkers, our study represents a novel approach.

Molecules published new progress about Adult, mammalian. 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

Wu, Alexander T. H. published the artcileIdentification of a Novel Theranostic Signature of Metabolic and Immune-Inflammatory Dysregulation in Myocardial Infarction, and the Potential Therapeutic Properties of Ovatodiolide, a Diterpenoid Derivative, SDS of cas: 72835-26-8, the main research area is myocardial infarction gene regulatory network ovatodiolide therapeutic property; DEG; inflammatory and metabolic dysregulation; miRNA; myocardial infarction; ovatodiolide; theranostic.

Myocardial infarction (MI) is a multifactorial global disease, recognized as one of the leading causes of cardiovascular morbidity and mortality. Timely and correct diagnoses and effective treatments could significantly reduce incidence of complications and improve patient prognoses. In this study, seven unconventional differentially expressed genes (DEGs) (MAN2A2, TNFRSF12A, SPP1, CSNK1D, PLAUR, PFKFB3, and CXCL16, collectively termed the MTSCPPC signature) were identified through integrating DEGs from six MI microarray datasets. The pathol. and theranostic roles of the MTSCPPC signature in MI were subsequently analyzed. We evaluated interactions of the MTSCPPC signature with ovatodiolide, a bioactive compound isolated from Anisomeles indica (L.) Kuntze, using in silico mol. docking tools and compared it to specific inhibitors of the members of the MTSCPPC signature. Single-cell transcriptomic anal. of the public databases revealed high expression levels of the MTSCPPC signature in immune cells of adult human hearts during an MI event. The MTSCPPC signature was significantly associated with the cytokine-cytokine receptor interactions, chemokine signaling, immune and inflammatory responses, and metabolic dysregulation in MI. Anal. of a micro (mi)RNA regulatory network of the MTSCPPC signature suggested post-transcriptional activation and the roles of miRNAs in the pathol. of MI. Our mol. docking anal. suggested a higher potential for ovatodiolide to target MAN2A2, CSNK1D, and TNFRSF12A. Collectively, the results derived from the present study further advance our understanding of the complex regulatory mechanisms of MI and provide a potential MI theranostic signature with ovatodiolide as a therapeutic candidate.

International Journal of Molecular Sciences published new progress about Adult, mammalian. 72835-26-8 belongs to class esters-buliding-blocks, name is (2,5-Dioxo-2,5-dihydro-1H-pyrrol-1-yl)methyl propionate, and the molecular formula is C8H9NO4, SDS of cas: 72835-26-8.

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

Vilar, Elena Garicano published the artcileA chemometric approach to characterize the aroma of selected brown and red edible seaweeds/extracts, Category: esters-buliding-blocks, the main research area is seaweed extraction chemometric approach aroma; GC-MS; GC-O; aroma; seaweeds; volatile compounds.

Information pertaining to the aromatic profile of seaweeds and seaweed extracts can provide evidence regarding their potential suitability as ingredients in processed foods. To date only limited material has been available on the volatile profiles of some seaweed species. Others in this study have not previously been described. The volatile profiles of dried brown (Himanthalia elongata, Undaria pinnatifida, Alaria esculenta) and red (Porphyra umbilicalis, Palmaria palmata) seaweeds, and a brown seaweed extract (fucoxanthin) from Laminaria japonica were investigated using a chemometric approach to collate data from volatile gas chromatog. – mass spectrometry (GC-MS), direct sensory aroma evaluation, and gas-chromatog. – olfactometry (GC-O) to obtain a better understanding of their volatile profile and sensory perception. More than 100 volatile compounds were identified by static headspace solid phase micro-extraction (HS-SPME) and thermal desorption gas chromatog. – mass spectrometry (TD GC-MS). Brown seaweeds were characterized by ‘grassy/herbal/floral’, ‘fruity’, and ‘fatty’ aromas, red seaweeds by ‘green/vegetable’, ‘mushroom/earthy’ and ‘sweet/buttery’ aromas, and the fucoxanthin extract by ‘rancid’ and ‘nutty’ aromas with an overall lower intensity. Heptanal appeared to be a major odor-active compound in all samples. Other volatiles were more characteristic of each individual seaweed: hexanal, (E,Z)-2,6-nonadienal and 2-pentylfuran for H. elongata; Et butanoate and 2,3-butanedione for U. pinnatifida; 6-dimethylpyrazine, (E,Z)-2,6-nonadienal and sulactone for P. palmata; 1-octen-3-ol for P. umbilicalis, heptanone for A. esculenta, and 2-furanmethanol for fucoxanthin. Brown and red seaweeds had distinct sensory properties with individual seaweeds having differing volatiles and odorants. This study provides addnl. information that can contribute to the development of products incorporating dried seaweeds/extracts that are more acceptable to the consumer.

Journal of the Science of Food and Agriculture published new progress about Alaria esculenta. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Category: esters-buliding-blocks.

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

Elpa, Decibel P. published the artcileRapid Extraction and Analysis of Volatile Solutes with an Effervescent Tablet, SDS of cas: 106-32-1, the main research area is effervescent tablet carbon dioxide volatile extraction.

Extraction of volatile compounds from complex liquid matrixes is a critical step in volatile compound anal. workflows. Recently, green chem. principles are increasingly implemented in extraction processes. Some of the available approaches are solvent-free but still require concentration or trapping of analytes. Here, we propose effervescent tablet-induced extraction (ETIE) as a method of transferring volatile/semivolatile compounds from liquid matrixes to the gas phase for anal. This technique relies on the release of carbon dioxide produced in situ during a neutralization reaction, which occurs when a tablet is inserted into an aqueous sample matrix. In this process, many bubbles of carbon dioxide are instantly formed in the sample matrix. The bubbles rapidly extract and liberate volatile compounds from the sample. The gaseous effluent is then immediately transferred to a detector (atm. pressure chem. ionization mass spectrometry (MS) or gas chromatog. (GC) hyphenated with MS). ETIE-GC-MS can be used for anal. of volatile compounds present in real samples. The method was validated for anal. of selected Et esters present in a yogurt drink. The calibration data set was linear over a range from 5 × 10-7 to 1 × 10-5 M. The limits of detection ranged from 1.51 × 10-7 to 6.82 × 10-7 M, while the recoveries ranged from 71 to 118%. Inter- and intraday precision of selected Et esters in aqueous solution was satisfactory (relative standard deviation, 3.6-18.3%). Furthermore, it is shown that ETIE improves the performance of headspace solid-phase microextraction while eliminating the need for heating and shaking samples.

Analytical Chemistry (Washington, DC, United States) published new progress about Aloe barbadensis. 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

Nievierowski, Tassia Henrique published the artcileRole of partial dehydration in a naturally ventilated room on the mycobiota, ochratoxins, volatile profile and phenolic composition of Merlot grapes intended for wine production, COA of Formula: C11H22O2, the main research area is grapes wine production mycobiota ochratoxins volatile profile phenolic composition; Aspergillus niger; Dehydrated grapes; Ochratoxin A; Oenological products; Phenolic compounds; Uncontrolled conditions; Volatile compounds.

Dehydration of grapes has been used in various regions of the world to produce special wines, aiming to add value to oenol. products. Post-harvest dehydration in rooms may be carried out regardless of weather conditions, without the addnl. cost of a specific infrastructure, in addition to the benefits of protecting the grapes from damages and environmental pollution. The objective of this study was to verify, for the first time, the impact of the dehydration in a naturally ventilated room on the quality of Merlot grapes. Physicochem. characteristics, mycobiota, occurrence of mycotoxins, volatile profile and phenolic composition of grapes were monitored on 7th, 14th and 21st days of dehydration (weight loss of 10, 20 and 27%, resp.). A decrease in aw (6%), pH (4%), and berry hardness (58%), along with an increase in total soluble solid content (15%) were observed during dehydration. The presence of Pestalotiopsis clavispora, Neopestalotiopsis clavispora, Colletotrichum siamense and Alternaria porri was favored during the dehydration process, while a decrease in the occurrence of Aspergillus niger and Phanerochaete sp. was verified. A. niger isolates showed no potential to produce forms of ochratoxins. These toxins were also not found in the grape samples. Regarding the volatile profile, 1-hexanal, 2-hexenal, and 1-octanal gave rise to the corresponding alcs. during dehydration, such as 1-hexanol, 2-hexen-1-ol, and 1-octanol. Acids (hexanoic, decanoic, and 3-hexenoic) resulted in the resp. Et esters (hexanoate, decanoate, and Et 3-hexenoate) during dehydration. Terpenes as limonene, myrcene, and geraniol decreased throughout dehydration, while their biotransformation products (α-terpineol, 6-methyl-5-hepten-2-one, and linalool, resp.) had an increase in concentration The phenolic content oscillated during dehydration, with an emphasis on increased levels of four hydroxybenzoic acids (Et gallate, p-hydroxybenzoic acid, gallic acid-hexose, and gallic acid), two hydroxycinnamic acids (caffeic acid and caftaric acid), two flavonols (kaempeferol galactoside and quercetin) and two anthocyanins (peonidin 3-O-hexoside and delphinidin 3-O-hexoside). Grapes of satisfactory quality were produced by dehydration in a naturally ventilated room. Even small wine producers can be encouraged to implement this procedure for the diversification of oenol. products, as it has no costs related to the implementation of chambers/tunnels.

Food Research International published new progress about Alternaria porri. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, COA of Formula: C11H22O2.

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

Toth, M. published the artcileImproving bisexual lures for the silver Y moth Autographa gamma L. and related plusiinae (Lepidoptera: Noctuidae), Application of Benzyl acetate, the main research area is Autographa Noctuidae bisexual eugenol.

The addition of synthetic eugenol and benzyl acetate to the known floral chem. and moth attractant phenylacetaldehyde synergized attraction of the silver Y moth Autographa gamma, an important noctuid pest. Traps baited with the ternary blend caught 2 to 6 times more A. gamma moths than traps baited with phenylacetaldehyde alone. Both female and male moths were attracted, supposedly in the natural sex ratio of the local population. More A. gamma were caught when the blend was formulated in dispenser types with higher release rates. Traps baited with the ternary lure in polyethylene bag dispensers caught 20% to 34% as many moths as were caught in traps baited with synthetic sex pheromone, suggesting that this improved bisexual lure could be efficient enough to yield a new tool for detection and monitoring of female and male A. gamma, for more reliable plant protection decisions.

Acta Phytopathologica et Entomologica Hungarica published new progress about Amathes c-nigrum. 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

Sakai, Takeo published the artcileTotal Synthesis of Brevisamide Using an Oxiranyl Anion Strategy, Application In Synthesis of 120157-98-4, the main research area is brevisamide total synthesis coupling etherification hydrogenation; diastereoselective synthesis brevisamide; nucleophilic substitution total synthesis brevisamide; Horner Wadsworth Emmons total synthesis brevisamide.

A total synthesis of brevisamide, a marine monocyclic ether amide isolated from the dinoflagellate Karenia brevis, has been achieved in 18 steps starting from 4-(benzyloxy)butanol. The synthesis involves oxiranyl anion coupling between an epoxy sulfone and a triflate, intramol. etherification of a hydroxy-bromoketone, diastereoselective introduction of the axial Me group by hydroxyl-directed hydrogenation of an exocyclic olefin, and installation of an acetamide side chain by nucleophilic substitution of an N-acetyl carbamate. The dienal side chain is assembled using a Horner-Wadsworth-Emmons reaction to complete the synthesis.

Journal of Organic Chemistry published new progress about Coupling reaction. 120157-98-4 belongs to class esters-buliding-blocks, name is tert-Butyl acetylcarbamate, and the molecular formula is C7H13NO3, Application In Synthesis of 120157-98-4.

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

Sanchez, Ramon M. published the artcileAn unexpected bicyclic pyrrolidinedione formed by rearrangement of the β-lactam ring under basic conditions, HPLC of Formula: 10047-10-6, the main research area is beta lactam rearrangement bicyclic pyrrolidinedione.

During synthetic studies on anti-elastase polycyclic β-lactams from conveniently substituted monolactams, we attempted to obtain an N-(1′-methoxycarbonyalkylidene)-β-lactam by α-selenoxide elimination. Although the desired alkenes were obtained, the main products were the N-unsubstituted 2-azetidinone and the bridged bicyclic pyrrolidinedione I. The structure of I was established by spectroscopic methods and confirmed by X-ray crystallog.

ARKIVOC (Gainesville, FL, United States) published new progress about Crystal structure. 10047-10-6 belongs to class esters-buliding-blocks, name is Methyl 2-aminopentanoate hydrochloride, and the molecular formula is C6H14ClNO2, HPLC of Formula: 10047-10-6.

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