M.W=150-200 Archives - Page 211 of 537

Myasoedova, Yu. V.’s team published research in Russian Journal of Organic Chemistry in 2021-01-31 | CAS: 111-11-5

Russian Journal of Organic Chemistry published new progress about Hydrazides Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Quality Control of 111-11-5.

Myasoedova, Yu. V. published the artcileTransformations of Peroxide Products of Non-1-ene Ozonolysis by the Action of Carboxylic Acid Hydrazides, Quality Control of 111-11-5, the main research area is peroxide nonene carboxylic acid hydrazide ozonolysis.

The behavior of aliphatic (cyclohexanecarboxylic) and aromatic (salicylic and isonicotinic) carboxylic acid hydrazides toward peroxide products of ozonolysis of a terminal alkene, non-1-ene, in protic (methanol) and aprotic solvents (THF, methylene chloride) has been studied. These hydrazides are capable of acting as reducing agents or decomposing intermediate peroxides. For the synthesis of N’-octylidene isoniazid derivative, it is advisable to carry out the reaction in methanol, whereas the use of THF as solvent favors formation of N’-octylidenecyclohexane-1-carbonydrazide. Salicylic acid hydrazide showed a low efficiency; in this case, mixtures of the corresponding hydrazone with octanoic acid or its Me ester were formed in a low yield.

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

Ubeda, Cristina’s team published research in Food Research International in 2019-05-31 | CAS: 106-32-1

Food Research International published new progress about Aging of materials. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Recommanded Product: Ethyl octanoate.

Ubeda, Cristina published the artcileStudy of the changes in volatile compounds, aroma and sensory attributes during the production process of sparkling wine by traditional method, Recommanded Product: Ethyl octanoate, the main research area is sparkling wine aroma sensory property volatile compound; Aging; Impact aroma compounds; Olfactometry; País grape variety; Sensory analysis; Volatile compounds; sparkling wine.

One of the strongest factors that affects the volatile profile of sparkling wine is the winemaking process. Here we focus on determining the effects of the second fermentation and aging on lees of sparkling wine from Pais grape variety combining different anal. techniques for the first time in sparkling wine: gas chromatog./mass spectrometry/olfactometry and sensorial anal. During the second fermentation and aging, there was a significant loss of esters that might be related to the adsorption on lees and ester volatility and chem. hydrolysis. The concentration of several compounds such as some esters (di-Et succinate, Et lactate, and Et isovalerate) increased during aging and could be used as aging markers. Vitispiranes were identified as the best norisoprenoids aging markers for young sparkling wines (12 mo of aging). Also, PCA showed that time of aging on lees affected mostly esters and terpenes. On the other hand, the diminution of fruity/floral impact odorants during aging was not perceived in sensorial trials. Our results suggest that the responsibility for fruity/floral nuances in sparkling wine might reside in a few high-impact aromatic compounds, such as Et isobutyrate, isoamyl acetate, Et hexanoate, β-phenylethanol and di-Et succinate.

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

Ubeda, Cristina’s team published research in Food Research International in 2019-05-31 | CAS: 111-11-5

Food Research International published new progress about Aging of materials. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, HPLC of Formula: 111-11-5.

Ubeda, Cristina published the artcileStudy of the changes in volatile compounds, aroma and sensory attributes during the production process of sparkling wine by traditional method, HPLC of Formula: 111-11-5, the main research area is sparkling wine aroma sensory property volatile compound; Aging; Impact aroma compounds; Olfactometry; País grape variety; Sensory analysis; Volatile compounds; sparkling wine.

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

Ubeda, Cristina’s team published research in Food Research International in 2019-05-31 | CAS: 123-29-5

Food Research International published new progress about Aging of materials. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Related Products of esters-buliding-blocks.

Ubeda, Cristina published the artcileStudy of the changes in volatile compounds, aroma and sensory attributes during the production process of sparkling wine by traditional method, Related Products of esters-buliding-blocks, the main research area is sparkling wine aroma sensory property volatile compound; Aging; Impact aroma compounds; Olfactometry; País grape variety; Sensory analysis; Volatile compounds; sparkling wine.

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

de Barros Vinhal, Gabrielle Lazara Ribeiro Rodrigues’s team published research in LWT–Food Science and Technology in 2022-04-15 | CAS: 110-42-9

LWT–Food Science and Technology published new progress about Antioxidants. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Computed Properties of 110-42-9.

de Barros Vinhal, Gabrielle Lazara Ribeiro Rodrigues published the artcileMurici (Byrsonima verbascifolia): A high bioactive potential fruit for application in cereal bars, Computed Properties of 110-42-9, the main research area is Byrsonima verbascifolia bioactive potential fruit cereal bar application.

In order to popularize and use murici fruit (Byrsonima verbascifolia) in processed foods, the aim of the study was to characterize the fresh fruit as to its antioxidant capacity, volatile and bioactive compounds and to evaluate the effect of murici content on total carotenoids and sensory attributes in enriched cereal bars. For the development of cereal bars, a Plackett-Burman design was elaborated, containing eight independent variables: glucose syrup, oats in thick flakes, corn flakes, rice flakes, dehydrated murici, soy lecithin, hydrogenated vegetable fat, and brown sugar. Fresh murici were characterized for proximate composition, total and individual carotenoids, antioxidant capacity, volatile compounds, and microbiol. anal. The murici was mainly a good source of fiber (6.4%) and lipids (7.3%), with significant levels of total carotenoids (15.3μg of β-carotene/g) and antioxidant capacity by FRAP method and ABTS method. The volatile fraction of murici mainly contains esters with descriptors such as cheese and fruity. The exptl. design used helped obtain the formulations of cereal bars with murici and demonstrated that the content of carotenoids increases as the amount of added fruit increases.

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

de Barros Vinhal, Gabrielle Lazara Ribeiro Rodrigues’s team published research in LWT–Food Science and Technology in 2022-04-15 | CAS: 111-11-5

LWT–Food Science and Technology published new progress about Antioxidants. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Formula: C9H18O2.

de Barros Vinhal, Gabrielle Lazara Ribeiro Rodrigues published the artcileMurici (Byrsonima verbascifolia): A high bioactive potential fruit for application in cereal bars, Formula: C9H18O2, the main research area is Byrsonima verbascifolia bioactive potential fruit cereal bar application.

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

Khacef, Leila’s team published research in Langmuir in 2021-12-28 | CAS: 140-11-4

Langmuir published new progress about Alkanes Role: NUU (Other Use, Unclassified), PEP (Physical, Engineering or Chemical Process), PRP (Properties), USES (Uses), PROC (Process). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, COA of Formula: C9H10O2.

Khacef, Leila published the artcileEffect of Solvent on the Mechanical and Structural Properties of N-Alkyldiamide Organogels, COA of Formula: C9H10O2, the main research area is effect solvent mech structural property alkyldiamide organogel.

Here, we study organogels prepared thanks to a new organogelator, the N-oleyldiamide mol., which shows a remarkable propensity to gelify a large scope of solvents, from aprotic to high protic solvents. The solvent plays a key role in the formation and stability of supramol. self-assemblies. However, the understanding and the control of its effects can be complex as many parameters are a priori involved. This study aims to understand the effect of solvent on the structures of organogels and on their final mech. properties. Five solvent classes have been selected ranking from low protic to high protic, according to the Hansen H-bond parameter δh. The solvent proticity appears to be one of the main parameters that affect the organogel internal structure and therefore the final rheol. properties. For a given organogelator fraction, the terminal elastic modulus measured by oscillatory rheol. is observed to increase significantly with the Hansen H-bond solvent parameter δh. Materials of different mech. properties are then shown to display various structures, which are investigated thanks to cryo-SEM. Besides, wide-angle X-ray scattering (WAXS) has been used to probe the gelator organization at the mol. scale with regard to the solvent nature, to understand the supramol. self-assembly of this promising mol.

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

Zhang, Xinyuan’s team published research in Journal of Chromatography A in 2020-01-11 | CAS: 106-32-1

Journal of Chromatography A published new progress about Alcohols Role: ANT (Analyte), ANST (Analytical Study). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Category: esters-buliding-blocks.

Zhang, Xinyuan published the artcileOptimization and validation of a head space solid-phase microextraction-arrow gas chromatography-mass spectrometry method using central composite design for determination of aroma compounds in Chinese liquor (Baijiu), Category: esters-buliding-blocks, the main research area is Baijiu aroma SPME GC MS; Aroma compounds; Central composite design; Chinese liquor (Baijiu); Gas chromatography–mass spectrometry; Headspace solid-phase microextraction Arrow.

A headspace solid-phase microextraction Arrow (HS-SPME Arrow) method coupled with gas chromatog.-mass spectrometry (GC-MS) was developed for the quantitation of a large number of aroma compounds in Chinese liquor (Baijiu). Optimization of extraction conditions by a central composite exptl. design revealed that the dilution of the alc. content of 5 mL of Baijiu to 10%, followed by the addition of 1.5 g of NaCl and subsequent SPME Arrow extraction with DVB/CAR/PDMS fiber coating over 45 min at 45°C was the most suitable. The quant. method allowed the extraction and identification of 82 aroma compounds (esters, alcs., fatty acids, aldehydes & ketones, furans, pyrazines, sulfur compounds, phenols, terpenes, and lactones) in the Baijiu sample. The method was validated with good repeatability, inter and intra-day precision (almost below 15%), and accuracy (almost in the range of 81.5-119.96%). Furthermore, the method was validated successfully for the most significant compounds and was applied to study the composition of volatile compounds in different types of Baijiu. This research proved that SPME Arrow is an effective method for the extraction of aroma compounds in Baijiu and other distilled spirits. This developed method will allow improved anal. of other distilled spirits.

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

Helberg, Julian’s team published research in Journal of Organic Chemistry in 2020-04-17 | CAS: 140-11-4

Journal of Organic Chemistry published new progress about Basicity, Lewis. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Product Details of C9H10O2.

Helberg, Julian published the artcilePyridinyl Amide Ion Pairs as Lewis Base Organocatalysts, Product Details of C9H10O2, the main research area is Lewis base organocatalyst pyridinyl amide ion pair; aza Morita Baylis Hillman reaction hindered electrophile isocyanate alc.

Pyridinyl amide ion pairs carrying various electron-withdrawing substituents were synthesized with selected ammonium or phosphonium counterions. Compared to neutral pyridine-based organocatalysts, these new ion pair Lewis bases display superior catalytic reactivity in the reaction of isocyanates with alcs. and the aza-Morita-Baylis-Hillman reaction of hindered electrophiles. The high catalytic activity of ion pair catalysts appears to be due to their high Lewis basicities toward neutral electrophiles as quantified through quantum chem. calculated affinity data.

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

Schoneich, Sonia’s team published research in Journal of Chromatography A in 2020-06-07 | CAS: 111-11-5

Journal of Chromatography A published new progress about Alkanes Role: ANT (Analyte), PEP (Physical, Engineering or Chemical Process), PRP (Properties), ANST (Analytical Study), PROC (Process). 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Product Details of C9H18O2.

Schoneich, Sonia published the artcileDynamic pressure gradient modulation for comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry detection, Product Details of C9H18O2, the main research area is dynamics pressure modulation comprehensive gas chromatog flight mass spectrometry; Comprehensive two-dimensional gas chromatography; Dynamic pressure gradient modulation; Flow modulation; Mass spectrometry.

Dynamic pressure gradient modulation (DPGM) is studied for comprehensive 2-dimensional gas chromatog. (GC × GC) with time-of-flight mass spectrometry (TOFMS) detection. With DPGM, a com. pneumatic pulse valve is opened to introduce a suitably high auxiliary gas pressure at a T-junction connecting the 1st dimension (1D) and 2nd dimension (2D) columns during the modulation period (PM), temporarily stopping the 1D flow. The valve is then closed for the duration of a pulse width (pw) to re-inject temporally focused 1D eluate onto the 2D column for separation This flow modulation technique is compatible with TOFMS detection using a 2D flow rate of 4 mL/min for the separation of a 90-component test mixture A 25 min separation window using a PM = 1 s and pw = 200 ms for full modulation (and 100% duty cycle) provided an average 1Wb = 4.5 s and 2Wb = 130 ms for a 2-dimensional peak capacity of nc,2D = 2700 (100 peaks per min). The detector response enhancement factor (DREF) serves as a metric for the enhanced sensitivity of the modulated relative to the unmodulated 1D peaks, with DREFs ranging between 10 and 20 and about a 5-fold improvement in signal-to-noise ratio (S/N). The bilinear quality of the GC × GC data is studied using the chemometric method parallel factor anal. (PARAFAC). Since PARAFAC requires sufficiently trilinear data, the reproducibility of the 2D peak shape for a given analyte is confirmed using lack-of-fit (LOF) and percent variation (R2) metrics. The limit-of-detection (LOD) for the representative analyte hexadecane is determined using PARAFAC, providing an LOD of 0.7 ppb (±0.03 ppb) for 3 replicates. Seven heavily overlapped analytes are also fully resolved by PARAFAC down to the part-per-million (ppm) concentration level, producing reproducible spectra with a majority of spectral match values (MV) over 800 (relative standard deviation ≤ 7.1%). This study provides promising results for DPGM as a flow modulation technique compatible with GC × GC-TOFMS, providing high sensitivity data suitable for chemometric anal.

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