Month: October 2022

Chen, An-jun; Luo, Wei; Niu, Kai-li; Peng, Yi-tao; Liu, Xing-yan; Shen, Guang-hui; Zhang, Zhi-qing; Wan, Hu; Luo, Qing-ying; Li, Shan-shan published the artcile< Research on the relationship between sensory profile and physicochemical properties of paocai, a Chinese fermented vegetable>, SDS of cas: 94-02-0, the main research area is paocai fermented vegetable sensory profile physicochem property.

Paocai is a popular fermented vegetable side dish or appetizer in China. This study was to investigate the relationship between its sensory quality and physicochem. properties by different statistical methods and to establish a regression prediction model for sensory scores. Principal component anal. disclosed that the sensory properties were neg. correlated with lactic acid and acetic acid contents. The cluster anal. classified the samples into three groups based on their sensory scores and the main differences among the groups were firmness, salinity, and acid production Finally, a prediction model with an adjusted R2 of 85.28% was established by partial least squares regression to predict the sensory scores and showed high reliability on six tested samples. Practical applications : Paocai is a popular side dish or appetizer in China that has a large annual production and consumption. Nowadays, the evaluation of the quality of paocai is mainly relied on sensory assessment, which is expensive to implement, time-consuming, and sometimes cannot be implemented online for immediate feedback. By establishing the relationship between sensory quality and physicochem. properties of paocai, it is possible to build online feedback of paocai production by instrumental detections.

Journal of Food Processing and Preservation published new progress about Alcohols Role: BUU (Biological Use, Unclassified), BIOL (Biological Study), USES (Uses). 94-02-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H12O3, SDS of cas: 94-02-0.

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

Peter, David; Brueckner, Reinhard published the artcile< Syntheses of a Pair of Simplified Model Compounds of the Dihydroxycyclopentenone Core of the Kodaistatins A-D>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is transition state kodaistatin synthon aldol condensation oxidation aldolization bromodiketone.

The kodaistatins A-D b are natural products from Aspergillus terreus with the potential of representing leads for a novel cure of type-2 diabetes. They possess an unusually and highly substituted dihydroxycyclopentenone core. Whether its OH groups are cis- or trans-configured remained unknown by spectroscopy. Previous syntheses of kodaistatin model compounds (cis-5, cis- and trans-6) allowed to make NMR comparisons with kodaistatin A. These findings are corroborated by the synthesis and ensuing NMR study of another pair of cis/trans-isomeric kodaistatin models (cis- and trans-7) described here. Its first key-step was a syn-selective aldol addition An oxidation/reduction sequence allowed reaching to the corresponding anti-aldol. Each aldol furnished a kodaistatin model in eight addnl. steps. The most noteworthy transformation was an SmII-induced intramol. aldolization of a bromodiketone.

European Journal of Organic Chemistry published new progress about Aldol addition. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Nasiru, Mustapha Muhammad; Umair, Muhammad; Boateng, Evans Frimpong; Alnadari, Fawze; Khan, Kashif-ur Rehman; Wang, Zhaobin; Luo, Ji; Yan, Wenjing; Zhuang, Hong; Majrashi, Ali; Zhang, Jianhao; Korma, Sameh A. published the artcile< Characterisation of Flavour Attributes in Egg White Protein Using HS-GC-IMS Combined with E-Nose and E-Tongue: Effect of High-Voltage Cold Plasma Treatment Time>, Category: esters-buliding-blocks, the main research area is egg white protein cold plasma headspace gas chromatog; E-nose; E-tongue; PCA; PLS-DA; egg white protein; flavour; high-voltage cold plasma; volatile compounds.

Egg white protein (EWP) is susceptible to denaturation and coagulation when exposed to high temperatures, adversely affecting its flavor, thereby influencing consumers’ decisions. Here, we employ high-voltage cold plasma (HVCP) as a novel nonthermal technique to investigate its influence on the EWP’s flavor attributes using E-nose, E-tongue, and headspace gas-chromatog.-ion-mobilisation spectrometry (HS-GC-IMS) due to their rapidness and high sensitivity in identifying flavor fingerprints in foods. The EWP was investigated at 0, 60, 120, 180, 240, and 300 s of HVCP treatment time. The results revealed that HVCP significantly influences the odor and taste attributes of the EWP across all treatments, with a more significant influence at 60 and 120 s of HVCP treatment. Principal component analyses of the E-nose and E-tongue clearly distinguish the odor and taste sensors’ responses. The HS-GC-IMS anal. identified 65 volatile compounds across the treatments. The volatile compounds’ concentrations increased as the HVCP treatment time was increased from 0 to 300 s. The significant compounds contributing to EWP characterization include heptanal, ethylbenzene, ethanol, acetic acid, nonanal, heptacosane, 5-octadecanal, decanal, p-xylene, and octanal. Thus, this study shows that HVCP could be utilized to modify and improve the EWP flavor attributes.

Molecules published new progress about Cold plasmas (High-Voltage). 623-50-7 belongs to class esters-buliding-blocks, and the molecular formula is C4H8O3, Category: esters-buliding-blocks.

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

Broadus, Katherine M.; Kass, Steven R. published the artcile< The Electron as a Protecting Group. 3. Generation of Acenaphthyne Radical Anion and the Determination of the Heat of Formation of a Strained Cycloalkyne>, Quality Control of 112-63-0, the main research area is electron protecting group generation acenaphthyne radical anion; formation heat strained cycloalkyne.

Acenaphthynedicarboxylate (12) was transferred into the gas phase from solution via electrospray ionization and subsequently was sequentially fragmented in a Fourier transform mass spectrometer to afford acenaphthyne radical anion (9). Structural confirmation of 9 was achieved by converting it to acenaphthenone enolate (13) and demonstrating that this species is identical to the ion produced upon deprotonation of acenaphthenone (5). The reactivity of 9 was explored, and since an electron can serve as a protecting group, the authors were able to measure the heat of hydrogenation (98 ± 4 kcal mol-1) and the heat of formation (160 ± 4 kcal mol-1) of acenaphthyne (1) via the application of a thermodn. cycle. Its strain energy (68 kcal mol-1) and acenaphthylene’s (10H) first and second C-H bond dissociation energies (117 ± 4 and 84 ± 2 kcal mol-1) also were obtained. Ab initio and d. functional theory calculations were carried out on the species of interest to explore their geometries and energetics. Results were interpreted in comparison to cyclopentyne, and its predicted heat of formation (98 kcal mol-1) and strain energy (59 kcal mol-1) are reported.

Journal of the American Chemical Society published new progress about Ab initio methods. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Quality Control of 112-63-0.

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

Wang, Xuechuan; Zhu, Jingbo; Liu, Xinhua; Zhang, Hui Jie; Zhu, Xing published the artcile< Novel Gelatin-based Eco-friendly Adhesive with a Hyperbranched Cross-linked Structure>, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is gelatin ecofriendly adhesive hyperbranched crosslinked polyamine polyester epoxy; leather waste collagen hydrolyzate adhesive polyamine polyester dendritic.

Gelatin (GE), a nontoxic and degradable biomass resource, is a multistage hydrolyzate of collagen. However, its application in adhesives was always limited by its brittleness and poor water resistance. In order to overcome this shortcoming, herein, epoxy-terminated hyperbranched polymers (EHPAEs) were first selected as a crosslinking agent to modify the GE extracted from leather solid wastes to prepare a series of novel GE-based environmentally friendly adhesives. First, EHPAE was synthesized and the structure of the hyperbranched polymer was measured by Fourier-transform IR and 1H NMR spectroscopy. Then, the adhesives were obtained using the EHPAE to modify GE. The adhesion effect of the prepared adhesives was evaluated by tensile and T-peel tests on the surface of leather, in order to determine whether this adhesive achieved the quality requirements for footwear and bags. The result indicated that EHPAE-modified GE-based adhesives had higher solid content, superior adhesion ability, and water resistance. Moreover, the bonding layer of this adhesive was tough and ductile, while the bonding layers of the recently reported GE-based adhesives were brittle. This adhesive also surpassed the recently reported GE-based adhesives in terms of water resistance and adhesion performance.

Industrial & Engineering Chemistry Research published new progress about Adhesives. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Wang, Tong; Guo, Qing; Li, Ping; Yang, Hua published the artcile< Deep-eutectic solvents/ionic liquids/water mixture as a novel type of green thermo-switchable solvent system for selective extraction and separation of natural products from Rosmarinus officinalis leaves>, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is Rosmarinus leaf extraction separation natural product deep eutectic solvent; green thermo switchable solvent system; Carnosic acid; Deep-eutectic solvents; Green solvent; Ionic liquid; Rosmarinic acid; Ultrasonic-assisted extraction.

In the present study, we designed a novel type of green thermo-switchable solvent system which is composed of ChCl:LA/[BMIM]PF6/H2O (volume/volume/v, 1/2/1) to extract natural products. When the temperature is 60°C, the system is a homogeneous single-phase system, and when cooling to 25°C, the system is switched into a heterogeneous two-phase system. Based on the thermo-switchable system, an integrated extraction method was developed which could efficiently extract both rosmarinic acid (hydrophilic) and carnosic acid (hydrophobic) from Rosmarinus officinalis leaves at 60°C and in situ sep. the extracted compounds with high recovery yields by cooling the extracts to 25°C. Rosmarinic acid was separated into the upper phase (88.97%) and carnosic acid was separated into the lower phase (97.46%). In addition to enhanced efficiency and no consumption of organic solvents, the method also completed the extraction and separation in a single step which further reduced the operation units.

Food Chemistry published new progress about Deep eutectic solvents. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Niu, K.; Wu, X. P.; Fu, Q.; Lang, K. P.; Zou, S. P.; Hu, Z. C.; Liu, Z. Q.; Zheng, Y. G. published the artcile< Effects of lipids and surfactants on the fermentation production of echinocandin B by Aspergillus nidulans>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is Aspergillus echinocandin B fermentation lipid; Echinocandin B; lipids; methyl oleate; surfactant; tween 80.

Echinocandin B (ECB) is a kind of lipopeptide antifungal antibiotic, as well as the key precursor of antifungal drug Anidulafungin. Its efficient bioprodn. plays an important role in promoting the industrial production of Anidulafungin. Methods and Results : In this study, Me oleate and Tween 80 were firstly used to enhance the ECB fermentation by Aspergillus nidulans, the results showed that the ECB titer was significantly enhanced with the addition of Me oleate and Tween 80. Among the lipids, Me oleate was found to play a pivotal role in increasing the ECB titer to 2123 mg l-1, which was more than five times higher than that of the control. The addition of Tween 80 in the medium resulted in ECB titer increased to 2584 mg l-1. The scanning electron microscope (SEM) and N-phenyl-1-naphthylamine (NPN) assay indicated that Tween 80 could influence the cell membrane permeability of A. nidulans, and enhance the intracellular and extracellular substance exchange, therefore lead to the increasing of ECB titer. Me oleate and Tween 80 are optimal carbon sources and surfactants for efficient ECB biosynthesis resp. Significance and Impact of the Study : Surfactant was used in ECB fermentation for the first time, which provided feasible ideas for optimizing the fermentation process of other fungi.

Journal of Applied Microbiology published new progress about Aspergillus nidulans. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Kim, Yeongsu; Yun, Jonghyeok; Shin, Hyun-Seop; Jung, Kyu-Nam; Lee, Jong-Won published the artcile< Synergistic nanoarchitecture of mesoporous carbon and carbon nanotubes for lithium-oxygen batteries>, Quality Control of 112-63-0, the main research area is mesoporous carbon lithium oxygen battery elec conductivity; Carbon nanotube; Electrochemistry; Lithium–oxygen battery; Mesoporous carbon.

A rechargeable lithium-oxygen battery (LOB) operates via the electrochem. formation and decomposition of solid-state Li2O2 on the cathode. The rational design of the cathode nanoarchitectures is thus required to realize high-energy-d. and long-cycling LOBs. Here, we propose a cathode nanoarchitecture for LOBs, which is composed of mesoporous carbon (MPC) integrated with carbon nanotubes (CNTs). The proposed design has the advantages of the two components. MPC provides sufficient active sites for the electrochem. reactions and free space for Li2O2storage, while CNT forests serve as conductive pathways for electron and offer addnl. reaction sites. Results show that the synergistic architecture of MPC and CNTs leads to improvements in the capacity ( ~18,400 mAh g- 1), rate capability, and cyclability (~200 cycles) of the CNT-integrated MPC cathode in comparison with MPC.

Nano Convergence published new progress about Current density. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Quality Control of 112-63-0.

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

Palo-Nieto, Carlos; Sau, Abhijit; Jeanneret, Robin; Payard, Pierre-Adrien; Salame, Aude; Martins-Teixeira, Maristela Braga; Carvalho, Ivone; Grimaud, Laurence; Galan, M. Carmen published the artcile< Copper Reactivity Can Be Tuned to Catalyze the Stereoselective Synthesis of 2-Deoxyglycosides from Glycals>, Computed Properties of 4098-06-0, the main research area is glycal deoxy glycoside copper catalyst stereoselective glycosylation disaccharide.

We demonstrate that tuning the reactivity of Cu by the choice of oxidation state and counterion leads to the activation of both “”armed”” and “”disarmed”” type glycals toward direct glycosylation leading to the α-stereoselective synthesis of deoxy-glycosides in good to excellent yields. Mechanistic studies show that CuI is essential for effective catalysis and stereocontrol and that the reaction proceeds through dual activation of both the enol ether as well as the OH nucleophile.

Organic Letters published new progress about Disaccharides Role: SPN (Synthetic Preparation), PREP (Preparation). 4098-06-0 belongs to class esters-buliding-blocks, and the molecular formula is C12H16O7, Computed Properties of 4098-06-0.

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

Wang, Yuxuan; Liu, Xintian; Su, Chen; Ding, Yanjun; Pan, Luqing published the artcile< Process optimization for fermented siwu decoction by multi-index-response surface method and exploration of the effects of fermented siwu decoction on the growth, immune response and resistance to Vibrio harveyi of Pacific white shrimp (Litopenaeus vannamei)>, SDS of cas: 112-63-0, the main research area is Vibrio Litopenaeus growth immune response fermented siwu decoction; Bacillus; Fermentation siwu decoction; Gut microbiota; Litopenaeus vannamei; Physiological functions.

The purpose of this study was to explore the optimal fermentation technol. of Chinese herbal medicine formula-Siwu Decoction and the effects of fermented Siwu Decoction (FSW) on the growth performance, immune response, intestinal microflora and anti microbial ability of Litopenaeus vannamei. Response to surface methodol. (RSM) was used to optimize the fermentation process of Siwu Decoction. The optimal fermentation conditions were obtained as follows: inoculation amount of mixed strains was 4.5%, fermentation time was 36 h, and the ratio of material to liquid was 20%. A total of 1260 shrimps were selected and divided into seven groups, three in parallel in each group. The dietary level of each group was as follows: Control (No additions), USW1 (0.2% unfermented herbal medicine), USW2 (0.5% unfermented herbal medicine), USW3 (0.8% unfermented herbal medicine), FSW1 (0.2% fermented herbal medicine), FSW2 (0.5% fermented herbal medicine), FSW3 (0.8% fermented herbal medicine). The immune response and antioxidant defense ability of hemocytes and intestine were measured at 21 and 42 days of feeding and the intestinal flora and growth performance were measured at 42 days of feeding, after that, a 7-day challenge test against Vibrio harveyi was conducted. The results showed that fermented Siwu Decoction significantly improved the growth performance and body composition of Litopenaeus vannamei; significantly increased the total number of hemocytes, phagocytic activity, antibacterial activity and bacteriolytic activity of Litopenaeus vannamei, and improved the antioxidant activity of Litopenaeus vannamei; the addition of fermented Siwu Decoction significantly increased the gene expression level of hemocytes and intestinal tract of Litopenaeus vannamei, and improved the antioxidant activity of Litopenaeus vannamei. The abundance of Bacillus increased, while the abundance of Vibrio decreased. After Vibrio harveyi challenge, the cumulative mortality of FSW group was significantly lower than that of control group. Fermented Siwu Decoction may be a potential physiol. enhancer in aquaculture, and can be widely used in aquaculture.

Fish & Shellfish Immunology published new progress about Actinobacteria. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, SDS of cas: 112-63-0.

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