Month: November 2022

Volatile composition changes in navel orange at different growth stages by HS-SPME-GC-MS was written by Hou, Jinxue;Liang, Lu;Wang, Yuanxing. And the article was included in Food Research International in 2020.Recommanded Product: 112-14-1 The following contents are mentioned in the article:

This study investigated the changes in volatile organic compounds (VOCs) of navel orange during fruit maturation. The volatiles in navel orange from July (young fruit period) to Nov. (com. maturation period) were separated by headspace solid-phase microextraction (HS-SPME) and analyzed using gas chromatog.-mass spectrometry (GC-MS). Fifty-seven VOCs were identified and classified into five groups. Through principal component anal., the samples of different months were discriminated, and one-way anal. of variance showed that 55 volatiles significantly differed during growth. Among the VOCs, the relative concentration of monoterpenes increased with maturity, and D-limonene was the component with the highest content. Similar behavior was exhibited for aldehydes, reaching the maximum content in Nov. On the contrary, esters decreased its concentration from July to Nov. The concentration of sesquiterpenes gradually increased, reaching the maximum level between August and Nov. Moreover, alcs. reached theirs largest content in Sept., β-Linalool had the highest content among the alcs. These results provided important theor. support for the development of navel orange components and comprehensively elucidate the flavor characteristics during the ripening of navel orange. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Recommanded Product: 112-14-1).

Octyl acetate (cas: 112-14-1) 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: 112-14-1

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

Fatty acids analysis in Hypomesus olidus different parts by GC-MS was written by Chen, Ping;Wang, Jian-gang;Zhang, Li. And the article was included in Shipin Gongye (Shanghai, China) in 2014.Formula: C20H40O2 The following contents are mentioned in the article:

The research aimed to determine and analyze the fatty acid compositions of Hypomesus olidus different parts. The lip soluble components were extracted from Hypomesus olidus different parts by Soxhlet extraction resp. The extracted fatty acids were identified by gas chromatog.-mass spectrometry (GC-MS) after Me etherification treatment, and the relative percentage of each component was confirmed by peak-area normalization method. The test results show that, the fat content in different parts of Hypomesus olidus was obviously different, the head (37.25%), muscle (29.87%) and visceral (67.58%). The fatty acid compositions were similar in different parts of Hypomesus olidus, main components of unsaturated fatty acids were palmitoleic acid, 9-octadecenoic acid, all z, 5,8,11,14,17-eicosapentaenoic acid, 4,7,10,13,16,19-docosahexaenoic acid, etc; the main components of saturated fatty acids were palmitic acid, tetradecanoic acid, octadecanoic acid, etc. The distribution of fatty acid contents has the obvious difference in different parts, EPA and DHA content in the visceral was significantly higher than that in other parts. This result provides the nutrition and health value of Hypomesus olidus was higher and it had comprehensive development and utilization prospect. This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8Formula: C20H40O2).

Methyl nonadecanoate (cas: 1731-94-8) 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.Formula: C20H40O2

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

Analysis of volatile components of garlic (Allium sativum L.) by GC-MS was written by Tian, Li;Yang, Xiuwei;Tao, Haiyan. And the article was included in Tianran Chanwu Yanjiu Yu Kaifa in 2005.Synthetic Route of C9H16O4 The following contents are mentioned in the article:

The volatile components of garlic were studied by GC-MS. The components in the cyclohexane, Et acetate and n-butanol extracts of the 95% alc. extract of garlic (Allium sativum) were compared with the volatile oil obtained by steam distillation from garlic. Qual. and quant. analyses were carried out by GC-MS (gas chromatog.-mass spectrometry). From the cyclohexane extraction, 112 components were detected and 38 compounds were identified, accounting for 80.08% of the cyclohexane extraction From the Et acetate extraction, 86 components were detected and 26 compounds were identified, accounting for 56.70% of the Et acetate extraction From the n-butanol extraction, no volatile component was detected by GC-MS. From the volatile oil obtained by steam distillation, 109 components were detected and 29 compounds were identified, accounting for 83.58% of the total volatile oil. The cyclohexane extraction and the Et acetate extraction of the 95% ethanol extract of garlic and the volatile oil were dominated by organosulfur components. According to the analyses of the cyclohexane extraction and the Et acetate extraction of the 95% ethanol extract of garlic, the contents of ajoene in the crude drug were 0.00395% and 0.00145%, resp. The content of ajoene in garlic was 0.00540%. This study involved multiple reactions and reactants, such as Ethyl methyl adipate (cas: 18891-13-9Synthetic Route of C9H16O4).

Ethyl methyl adipate (cas: 18891-13-9) 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.Synthetic Route of C9H16O4

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

Characterizations of the Extracts from Geting Bituminous Coal by Spectrometries was written by Shi, Da-Ling;Wei, Xian-Yong;Fan, Xing;Zong, Zhi-Min;Chen, Bo;Zhao, Yun-Peng;Wang, Yu-Gao;Cao, Jing-Pei. And the article was included in Energy & Fuels in 2013.Recommanded Product: 5444-75-7 The following contents are mentioned in the article:

Geting bituminous coal (GBC) was sequentially extracted with petroleum ether, carbon disulfide (CDS), methanol, acetone, and isometric CDS/acetone mixed solvent at room temperature to afford extracts 1-5 (E₁-E₅) and residue. Detailed characterizations of the extracts were performed with a gas chromatog./mass spectrometer (GC/MS), FTIR spectrometer, and direct anal. in real-time ionization source (DARTIS) coupled to an ion-trap mass spectrometer (ITMS). GBC and its residue were also analyzed with the FTIR spectrometer. Particle sizes of the residue were significantly reduced compared to those of GBC according to the observation with a scanning electron microscope. Arenes with 1-4 rings and more condensed arenes were enriched into E₁ and E₂, resp., while more heteroatom-containing organic species were detected in other extracts, especially in E₃ and E₄ according to GC/MS anal. The extracts, especially E₁-E₄, contain more aliphatic moieties and less aromatic moieties compared to GBC and its residue based on FTIR anal. DARTIS/ITMS proved to be a powerful tool for analyzing thermally labile and/or nonvolatile species, which are difficult to be identified with GC/MS, in the extracts This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Recommanded Product: 5444-75-7).

2-Ethylhexyl benzoate (cas: 5444-75-7) 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. 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.Recommanded Product: 5444-75-7

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

Volatile composition analysis of tree peony (Paeonia section Moutan DC.) seed oil and the effect of oxidation during storage was written by Zhang, Yu;Luo, Jingwen;Zeng, Fankun. And the article was included in Journal of Food Science in 2021.Computed Properties of C10H20O2 The following contents are mentioned in the article:

Peony (Paeonia section Moutan DC.) seed oil is a novel vegetable oil with unique aromatic profile. The objectives of this study were to characterize the volatile compounds with optimized anal. conditions, and to study the effects of oxidation during storage. The Headspace Solid-phase Micro-extraction (HS-SPME) conditions were optimized with factors including extraction fiber, extraction time and temperature, as well as sample amount and desorption time. Then, the aromatic compounds extracted from peony seed oil were determined using the odor activity value (OAV) method coupled with the GC-olfactometry. Results found that the best HS-SPME conditions were DVB/CAR/PDMS fibers with magnetic stirring for 50 min of extraction at 60°C. The optimal sample amount was 4 g with 6 min of desorption. Forty-one volatile components were found, and 19 aromatic components were identified using GC-MS and GC-olfactometry. This is the first study to describe 4,7-dimethylbenzofuran in peony seed oil with a unique aroma of grass, light bitter, and fragrance. The stability of alc. and terpenoids decreased as accelerated oxidation progresses. This study provides the theor. basis for the sensory attributes, and shelf-life of peony seeds oil products for industry production and marketing. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Computed Properties of C10H20O2).

Octyl acetate (cas: 112-14-1) 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. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Computed Properties of C10H20O2

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

Antimicrobial peptide K11 selectively recognizes bacterial biomimetic membranes and acts by twisting their bilayers was written by Ramos-Martin, Francisco;Herrera-Leon, Claudia;Antonietti, Viviane;Sonnet, Pascal;Sarazin, Catherine;D’Amelio, Nicola. And the article was included in Pharmaceuticals in 2021.HPLC of Formula: 26662-94-2 The following contents are mentioned in the article:

K11 is a synthetic peptide originating from the introduction of a lysine residue in position 11 within the sequence of a rationally designed antibacterial scaffold. Despite its remarkable antibacterial properties towards many ESKAPE bacteria and its optimal therapeutic index (320), a detailed description of its mechanism of action is missing. As most antimicrobial peptides act by destabilizing the membranes of the target organisms, we investigated the interaction of K11 with biomimetic membranes of various phospholipid compositions by liquid and solid-state NMR. Our data show that K11 can selectively destabilize bacterial biomimetic membranes and torque the surface of their bilayers. The same is observed for membranes containing other neg. charged phospholipids which might suggest addnl. biol. activities. Mol. dynamic simulations reveal that K11 can penetrate the membrane in four steps: after binding to phosphate groups by means of the lysine residue at the N-terminus (anchoring), three couples of lysine residues act subsequently to exert a torque in the membrane (twisting) which allows the insertion of aromatic side chains at both termini (insertion) eventually leading to the flip of the amphipathic helix inside the bilayer core (helix flip and internalization). This study involved multiple reactions and reactants, such as (2R,9Z)-1-(((2-Aminoethoxy)(hydroxy)phosphoryl)oxy)-3-(palmitoyloxy)propan-2-yl oleate (cas: 26662-94-2HPLC of Formula: 26662-94-2).

(2R,9Z)-1-(((2-Aminoethoxy)(hydroxy)phosphoryl)oxy)-3-(palmitoyloxy)propan-2-yl oleate (cas: 26662-94-2) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. 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.HPLC of Formula: 26662-94-2

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

Pharmaceutical compounds in aquatic environment in China: locally screening and environmental risk assessment was written by Chen, Yongshan;Xi, Xiuping;Yu, Gang;Cao, Qiming;Wang, Bin;Vince, Francois;Hong, Youwei. And the article was included in Frontiers of Environmental Science & Engineering in 2015.Recommanded Product: 4-Acetamidophenyl 2-acetoxybenzoate The following contents are mentioned in the article:

An environmental risk assessment was performed for pharmaceutical compounds present in the aquatic environment of China. Predicted environmental concentration (PEC) of the compounds were calculated according to European Medicines Evaluation Agency (EMEA) guidelines. Available ecotoxicol. data compromised by applying a very conservative assessment factor (AF) were employed to calculate the predicted noeffect concentration (PNEC). The screening principle and the risk assessment were based on risk quotient (RQ), which derived from the PEC and related PNEC values. PEC results indicated that all the compounds except sulfadimethoxine and levocarnitine, should carry out phase II risk assessment in EMEA guideline. RQ values suggested that more than 36 pharmaceuticals may be imposed health threats to the aquatic environment; especially the antibiotic therapeutic class including amoxicillin, sulfasalazine, trimethoprim, oxytetracycline and erythromycin showed high RQ values. These substances with high RQ value (RQ≥1) were regarded as toppriority pharmaceuticals for control in the aquatic environment of China. However, the antibiotic substances which had low risk quotient (RQ <1), should be reassessed by its potentially induced resistance under low concentration in future. This study involved multiple reactions and reactants, such as 4-Acetamidophenyl 2-acetoxybenzoate (cas: 5003-48-5Recommanded Product: 4-Acetamidophenyl 2-acetoxybenzoate).

4-Acetamidophenyl 2-acetoxybenzoate (cas: 5003-48-5) 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. 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: 4-Acetamidophenyl 2-acetoxybenzoate

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

Characteristics of particulate matter emissions from toy cars with electric motors was written by Wang, Xiaofei;Williams, Brent J.;Biswas, Pratim. And the article was included in Journal of the Air & Waste Management Association in 2015.Related Products of 5444-75-7 The following contents are mentioned in the article:

Aerosol emissions from toy cars with elec. motors were characterized. Particle emission rates from the toy cars, as high as 7.47 × 10⁷ particles/s, were measured. This emission rate is lower than other indoor sources such as smoking and cooking. The particles emitted from toy cars are generated from spark discharges inside the elec. motors that power the toy cars. Size distribution measurements indicated that most particles were below 100 nm in diameter Copper was the dominant inorganic species in these particles. By deploying aerosol mass spectrometers, high concentrations of particulate organic matter were also detected and characterized in detail. Several organic compounds were identified using a thermal desorption aerosol gas chromatog. The mass size distribution of particulate organic matter was bimodal. The formation mechanism of particulate organic matter from toy cars was elucidated. Implications: A possible new source of indoor air pollution, particles from elec. motors in toy cars, was identified. This study characterized aerosol emissions from toy cars in detail. Most of these particles have a diameter less than 100 nm. Copper and some organics are the major components of these particles. Conditions that minimize these emissions were determined This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Related Products of 5444-75-7).

2-Ethylhexyl benzoate (cas: 5444-75-7) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. 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.Related Products of 5444-75-7

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

Efficiency of Ocimum basilicum and Eucalyptus globulus essential oils on anesthesia and histopathology of rainbow trout, Oncorhynchus mykiss was written by Yigit, Nalan Ozgur;Metin, Secil;Sabuncu, Omer Faruk;Didinen, Behire Isil;Didinen, Hakan;Ozmen, Ozlem;Koskan, Ozgur. And the article was included in Journal of the World Aquaculture Society.Related Products of 112-14-1 The following contents are mentioned in the article:

In this study, anesthetic effects of Ocimum basilicum and Eucalyptus globulus essential oils were investigated on rainbow trout, Oncorhynchus mykiss. Fish (average 10 g) were exposed to 20, 50, 70, 100, 150, 200, 300, 400, 500, and 600 mg L-1 essential oils, anesthesia induction, and recovery times were recorded sep. for each fish. Acute toxicities of essential oils (10 min LC50 concentration) on rainbow trout were determined at 70-400 mg L-1. In addition, histopathol. effects of the essential oils in fish tissues were determined after deep anesthesia. As a result of this study, O. basilicum at 300 mg L-1 dose and E. globulus essential oils at 400 mg L-1 dose showed ideal anesthetic effects on rainbow trout. Anesthesia induction (stage 4) and recovery times at this concentration for E. globulus were found as 186 and 117.5 s, resp. Anesthesia induction (stage 4) and recovery times were 220.5 and 61 s for this concentration in O. basilicum essential oil, resp. The toxic effects of essential oils for rainbow trout were not found. No pathol. finding in gill, liver, and kidney was observed at the histopathol. examination Consequently, this study demonstrated that O. basilicum and E. globulus essential oils can be used as an effective and safe anesthetic in rainbow trout. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Related Products of 112-14-1).

Octyl acetate (cas: 112-14-1) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. 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.Related Products of 112-14-1

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

Esterification of Benzoic Acid with 2-Ethylhexanol in a Microwave Stirred-Tank Reactor was written by Pipus, G.;Plazl, I.;Koloini, T.. And the article was included in Industrial & Engineering Chemistry Research in 2002.Computed Properties of C15H22O2 The following contents are mentioned in the article:

A microwave applicator with a 2.45-GHz magnetron generator, which provides 460 W of output power, and waveguides to a stirred-tank reactor with a full volume of 500 mL was designed. The microwave reactor operates at high pressure and high temperature Esterification of benzoic acid with 2-ethylhexanol was chosen as the model reaction. The esterification was homogeneously catalyzed with sulfuric acid and para-toluene sulfonic acid. As heterogeneous catalysts, Cs_2.5H_0.5PW₁₂O₄₀, sulfated ZrO₂, Fe₂(SO₄)₃, and montmorillonite KSF were used. For the same operating conditions, the rate of esterification was concluded to be the same in both the microwave reactor and conventional exptl. setups. The results show that homogeneous catalysts are more effective than heterogeneous catalysts. Fe₂(SO₄)₃ was the most effective catalyst among the solid catalysts tested. The conversions in the microwave stirred-tank reactor were in agreement with the conversions predicted on the basis of the kinetic parameters obtained under conventional heating. High-pressure and high-temperature operating conditions allowed the reaction rate of esterification to be greatly increased. This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Computed Properties of C15H22O2).

2-Ethylhexyl benzoate (cas: 5444-75-7) 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. Computed Properties of C15H22O2

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