Month: February 2023

Aroma-Active Compounds in Robusta Coffee Pulp Puree-Evaluation of Physicochemical and Sensory Properties was written by Buck, Nina;Wohlt, Daria;Winter, Anne Ruth;Ortner, Eva. And the article was included in Molecules in 2021.Recommanded Product: 706-14-9 This article mentions the following:

Wet coffee processing generates a large amount of coffee pulp waste that is mostly disposed of in the processing units. To reduce this waste and the associated environmental burden, an alternative strategy would be to exploit the coffee pulp to produce a durable and stable consumable product. Accordingly, a puree produced from Robusta coffee pulp was investigated in relation to its physicochem. and sensory properties. After thermal and chem. stabilization, the obtained puree (pH 3.6) was found to exhibit a multimodal particle size distribution, shear-thinning behavior, and lower discoloration, as well as an antioxidant capacity of 87.9μmolTE/gDM. The flavor of the puree was examined by sensory evaluation and the corresponding analyses of aroma-active volatile compounds, as determined using aroma extract dilution analyses (AEDA) and gas chromatog.-mass spectrometry/olfactometry (GC-MS/O). The puree was characterized by dominant fruity (4.4), floral (3.4), citrusy (3.3) and hay-like (3.3) odor impressions. The aroma-active compounds were predominantly aldehydes, acids, and lactones, whereby (E)-β-damascenone, geraniol, 4-methylphenol, 3-hydroxy-4,5-dimethylfuran-2(5H)-one, and 4-hydroxy-3-methoxybenzaldehyde exhibited the highest flavor dilution (FD) factor (1024), thereby indicating their high impact on the overall aroma of the puree. This study demonstrates an approach to stabilize coffee pulp to produce a sweet, fruity puree with comparable phys. properties to other fruit purees and that can be used as a new and versatile flavoring ingredient for various food applications. In the experiment, the researchers used many compounds, for example, 5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9Recommanded Product: 706-14-9).

5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Recommanded Product: 706-14-9

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

Transition-Metal-Free Deaminative Vinylation of Alkylamines was written by Hu, Jiefeng;Cheng, Bo;Yang, Xianyu;Loh, Teck-Peng. And the article was included in Advanced Synthesis & Catalysis in 2019.Application of 185619-66-3 This article mentions the following:

An efficient metal-free system, that was capable of activating the C-N bonds of Katritzky pyridinium salts I [R = 3,3-difluorocyclobutyl, cyclohexyl, PhCH₂CH(CO₂Me), etc.] derived from diverse alkylamines for deaminative vinylation to produce various olefins RCH=CHAr [Ar = Ph, 2-thienyl, 4-FC₆H₄, etc.]. The key to the high reactivity was the utilization of pyridinium salt-activated alkylamines I with a base as a promoter. The transformation exhibited good functional group compatibility and included inexpensive primary amine feedstocks and amino acids. The proposed method could serve as a powerful synthetic method for late-stage modification of complex compounds Mechanistic experiments suggestes that free radical processes are involved in this system. In the experiment, the researchers used many compounds, for example, tert-Butyl (3-ethynylphenyl)carbamate (cas: 185619-66-3Application of 185619-66-3).

tert-Butyl (3-ethynylphenyl)carbamate (cas: 185619-66-3) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Application of 185619-66-3

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

Contribution by Saccharomyces cerevisiae yeasts to fermentation and flavour compounds in wines from cv. Kalecik karasi grape was written by Nurgel, C.;Erten, H.;Canbas, A.;Cabaroglu, T.;Selli, S.. And the article was included in Journal of the Institute of Brewing in 2002.Electric Literature of C11H14O3 This article mentions the following:

The effect of indigenous and com. S. cerevisiae yeasts on fermentation and flavor compounds of wines was examined in pasteurized grape juice. The flavor compounds were analyzed and identified by GC-FID and GC-MS, resp. and in general, the amounts of these volatiles were increased by the use of both indigenous and com. yeasts. The levels of isoamyl alc., isoamyl acetate, Et octanoate and Et deconoate exceeded flavor thresholds. All grape juices were fermented to dryness. Selected yeasts produced higher ethanol concentrations compared to spontaneous fermentations In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0Electric Literature of C11H14O3).

Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Electric Literature of C11H14O3

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

Multicolor Activatable Raman Probes for Simultaneous Detection of Plural Enzyme Activities was written by Fujioka, Hiroyoshi;Shou, Jingwen;Kojima, Ryosuke;Urano, Yasuteru;Ozeki, Yasuyuki;Kamiya, Mako. And the article was included in Journal of the American Chemical Society in 2020.HPLC of Formula: 4163-60-4 This article mentions the following:

Raman probes based on alkyne or nitrile tags hold promise for highly multiplexed imaging. However, sensing of enzyme activities with Raman probes is difficult because few mechanisms are available to modulate the vibrational response. Here we present a general strategy to prepare activatable Raman probes that show enhanced Raman signals due to electronic preresonance (EPR) upon reaction with enzymes under physiol. conditions. We identified a xanthene derivative bearing a nitrile group at position 9 (9CN-JCP) as a suitable scaffold dye, and synthesized four types of activatable Raman probes, which are targeted to different enzymes (three aminopeptidases and a glycosidase) and tuned to different vibrational frequencies by isotope editing of the nitrile group. We validated the activation of the Raman signals of these probes by the target enzymes and succeeded in simultaneous imaging of the four enzyme activities in live cells. Different cell lines showed different patterns of these enzyme activities. In the experiment, the researchers used many compounds, for example, (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 4163-60-4HPLC of Formula: 4163-60-4).

(2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 4163-60-4) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.HPLC of Formula: 4163-60-4

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

Synthesis of bifunctional hydroxamic acids as novel ligands for the hydrophilic stabilization of iron oxide nanoparticles was written by Hofmann, Andreas;Graf, Christina;Kung, Shih-Hao;Kim, Myeongseob;Peng, Xiaogang;El-Aama, Randa;Ruehl, Eckart. And the article was included in Synthesis in 2010.Application of 3903-40-0 This article mentions the following:

A general method for synthesizing bifunctional hydroxamates containing carboxylate or amino functionalities was reported. Various products from simple alkyl to complex dendrimer-like structures were described. Such mols. were used recently in ligand-exchange reactions for the hydrophilic stabilization of originally oleate-protected iron oxide nanoparticles. In the experiment, the researchers used many compounds, for example, 12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0Application of 3903-40-0).

12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Application of 3903-40-0

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

Contents of some bioactive compounds in Norway spruce needles as affected by short-term storage at different conditions and implications for their industrial use was written by Sciukaite, Agne;Loziene, Kristina;Labokas, Juozas;Jurkoniene, Sigita. And the article was included in Industrial Crops and Products in 2022.COA of Formula: C12H20O2 This article mentions the following:

The main aim of the research was to evaluate changes in contents of essential oils and pigments in Norway spruce needles as affected by short-term storage under different conditions as well as to assess the potential resources of winter-harvested foliage obtainable from byproducts of forest felling as a natural source of these bioactives. One- and two-year-old needles were taken for the analyses fresh (control) and after five-week storage at three different conditions: at 4°C in fridge, at -24°C in freezer and in the forest of their origin. Essential oils were isolated from needles by hydrodistillation and analyzed by gas chromatog.-mass spectrometry. Analyses of chlorophylls and carotenoids were performed spectrophotometrically. The study showed that none of the tested storage conditions of P. abies needles had significant influence on the total amounts of essential oils in them varying from 0.16% to 0.20% per dry matter (v/w) in two- and one-year-old needles, resp. Bornyl acetate was the main compound identified in the essential oils amounting to 14.47-40.04%. The mean total contents of chlorophylls amounted to 1.10 mg/g in one-year-old needles and to 1.28 mg/g in two-year-old ones measured in fresh weight Statistically significant differences were established in the levels of all the pigments analyzed between fresh material, and stored under controlled, -24°C and 4°C, conditions both of 1-yr-old and 2-yr-old needles. The highest contents of the pigments were obtained after the storage at 4°C as well as under the natural forest condition. Based on the above data and the national forestry statistics, potential yields of essential oils (6.45 kg), total chlorophylls (9.27 kg) and total carotenoids (1.32 kg) were assessed per ha of a mature sprucewood stand in Lithuania. In the experiment, the researchers used many compounds, for example, (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3COA of Formula: C12H20O2).

(E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.COA of Formula: C12H20O2

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

Effect of microbial communities on the quality characteristics of northeast soybean paste: Correlation between microorganisms and metabolites was written by Yao, Di;Ma, Lixue;Wu, Mengna;Wang, Xiaoyu;Xu, Lei;Yu, Qiaoru;Wang, Changyuan. And the article was included in LWT–Food Science and Technology in 2022.Category: esters-buliding-blocks This article mentions the following:

To systematically explore the impact of microbial community composition on the quality characteristics of northeast soybean paste, the microbial community structure was determined by high-throughput sequencing technol. and the flavor substance, free amino acid (FAA) and biogenic amine (BA) contents were determined by HS-SPME-GC-MS and HPLC. Furthermore, the correlation between microorganisms and metabolites was investigated. The results indicated that the core bacteria mainly included Tetragenococcus, Bacillus and Lactobacillus; Candida_f__norank, Wickerhamomyces and Aspergillus were the dominant fungi. A total of 139 flavor compounds were detected in all samples, and decamethylcyclopentasiloxane, isoamyl phenylacetate and octamethylcyclotetrasiloxane accounted for the highest proportion. A total of 24 FAAs were detected in the soybean paste. Pantoea, Kroppenstedtia and Kocuria were significantly pos. correlated with most FAAs (p < 0.05). Addnl. 5 BAs were detected in the soybean paste, and the contents of BAs in Y4 were highest, which was affected by different microbes. This study provided relevant information for the microbial community composition and metabolites of northeast soybean paste, which was of great significance for understanding the characteristics and safety of soybean paste. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Category: esters-buliding-blocks).

Methyl2-methylbutyrate (cas: 868-57-5) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.Category: esters-buliding-blocks

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

Synthesis of azide-fluoro-dehydrocoelenterazine analog as a photoaffinity-labeling probe and photolysis of azide-fluoro-coelenterazine was written by Kuse, Masaki;Doi, Issei;Kondo, Nobuhiro;Kageyama, Yukari;Isobe, Minoru. And the article was included in Tetrahedron in 2005.SDS of cas: 587-88-2 This article mentions the following:

A photosensitive azide-fluoro-dehydrocoelenterazine analog (Az-F-DCT) was synthesized, starting from 4-fluorophenylacetic acid, as a photoaffinity-labeling probe to analyze symplectin active site. To examine the photo-reactivity of Az-F-DCT, azide-fluoro-coelenterazine analog (Az-F-CT) was used as a potent symplectin chromophore model. Photolysis of Az-F-CT in 2,2,2-trifluoroethanol afforded a nitrene intermediate to give an insertion product. The structure of this product was confirmed through spectroscopic analyses particularly by using a proton/deuterium (H/D) exchange experiment with ESI-Q-TOF-MS and -MS/MS measurement. In the experiment, the researchers used many compounds, for example, Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2SDS of cas: 587-88-2).

Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.SDS of cas: 587-88-2

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

Changes of apple fruit volatile profiles induced by fresh bruise at early stage was written by Chen, Qing;Qin, Wenhao;She, Mengqi;Chen, Siyu;Wang, Fang;Tan, Zuojun. And the article was included in Journal of Food and Nutrition Research (Bratislava, Slovakia) in 2021.Quality Control of Methyl2-methylbutyrate This article mentions the following:

Fresh bruise of apple is a major postharvest problem, which is easily ignored at early stage and can develop into more serious external bruise as the time goes on. In this study, we investigated changes of volatile organic compounds (VOCs) profile of apples with fresh bruise during 0-24 h. For this purpose, headspace solid-phase microextraction (HS-SPME) combined with gas chromatog.-mass spectrometry (GC-MS) was used. A total of 43 aroma compounds were identified in apple, consisting of 8 carbonyl compounds, 23 esters, 5 alcs., 5 terpenes and 2 other compounds The data of VOCs were subjected to partial least squares discriminant anal., which showed that 12 h might be the optimum time for apple quality maintenance after fresh bruise. The content of VOCs in bruised tissues showed a significant increase, while they were basically unchanged in healthy tissues. The content of carbonyl compounds increased during 0-24 h, in particular C6 and C9 aldehydes. The content of (3E,6E)-3,7,11-trimethyldodeca-1,3,6,10-tetraene was increased. The results of this study may help top to understand the metabolic disorder and quality maintenance after fresh bruise in apple fruits. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Quality Control of Methyl2-methylbutyrate).

Methyl2-methylbutyrate (cas: 868-57-5) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Quality Control of Methyl2-methylbutyrate

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

New amphiphilic platinum(II) phthalocyanine with peracetylated β-galactose moiety – Synthesis and photophysical properties was written by Volov, Alexander N.;Volov, Nikolai A.;Burtsev, Ivan D.. And the article was included in Polyhedron in 2021.Recommanded Product: (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate This article mentions the following:

The synthesis of new glycoconjugated phthalonitrile connected with galactose moiety by triazole spacer via Cu(II)-mediated click reaction is reported. Reaction of azido derivatives of β-D-galactopyranose tetraacetate with 4-O-propargyloxy-substituted phthalonitrile in presence copper(II) sulfate pentahydrate and sodium L-ascorbate in tert-butanol/water gave desired glycophthalonitrile with 79% yield. Obtained phthalonitrile underwent mixed-cyclization with the 4-tert-butyl-substituted phthalonitrile, to afford the mono-glycosylated platinum(II) phthalocyanine. Upon irradiation these compounds could sensitize the formation of singlet oxygen in acetone, with 0.90 quantum yield by method with use of 1,3-diphenylisobenzofuran (DPBF) as scavenger. In the experiment, the researchers used many compounds, for example, (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 4163-60-4Recommanded Product: (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate).

(2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 4163-60-4) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Recommanded Product: (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate

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