Month: December 2022

Kramer, Stefan published the artcileHPMA-Based Nanoparticles for Fast, Bioorthogonal iEDDA Ligation, COA of Formula: C16H30O2, the main research area is antibody immunoconjugate HPMA nanoparticle.

Fast and bioorthogonally reacting nanoparticles are attractive tools for biomedical applications such as tumor pretargeting. In this study, we designed an amphiphilic block copolymer system based on HPMA using different strategies to introduce the highly reactive click units 1,2,4,5-tetrazines (Tz) either at the chain end (Tz-CTA) or statistical into the hydrophobic block. This reactive group undergoes a rapid, bioorthogonal inverse electron-demand Diels-Alder reaction (iEDDA) with trans-cyclooctenes (TCO). Subsequently, this polymer platform was used for the preparation of different Tz-covered nanoparticles, such as micelles and colloids. Thereby it was found that the reactivity of the polymeric micelles is comparable to that of the low molar mass tetrazines. The core-cross-linked micelles can be successfully conjugated at rather low concentrations to large biomacromols. like antibodies, not only in physiol. buffer, but also in human blood plasma, which was confirmed by fluorescence correlation spectroscopy.

Biomacromolecules published new progress about Crosslinking. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, COA of Formula: C16H30O2.

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

Maccesi, Martina published the artcileMulti-center screening of the Pathogen Box collection for schistosomiasis drug discovery, Application In Synthesis of 55981-09-4, the main research area is schistosomiasis drug discovery pathogen Box; Drug discovery; MMV; Pathogen Box; Phenotypic screen; Schistosoma; Schistosomiasis.

Over the past five years, as a public service to encourage and accelerate drug discovery for diseases of poverty, the Medicines for Malaria Venture (MMV) has released box sets of 400 compounds named the Malaria, Pathogen and Stasis Boxes. Here, we screened the Pathogen Box against the post-infective larvae (schistosomula) of Schistosoma mansoni using assays particular to the three contributing institutions, namely, the University of California San Diego (UCSD) in the USA, the Swiss Tropical and Public Health Institute (Swiss TPH) in Switzerland, and the Fundaça Oswaldo Cruz (FIOCRUZ) in Brazil. With the same set of compounds, the goal was to determine the degree of inter-assay variability and identify a core set of active compounds common to all three assays. New drugs for schistosomiasis would be welcome given that current treatment and control strategies rely on chemotherapy with just one drug, praziquantel. Both the UCSD and Swiss TPH assays utilize daily observational scoring methodologies over 72 h, whereas the FIOCRUZ assay employs XTT (2,3-bis(2-methoxy-4-nitro-5-sulfophenyl)-5-[(phenylamino)carbonyl]-2H-tetrazolium hydroxide) at 72 h to measure viability as a function of NAD+/NADH redox state. Raw and transformed data arising from each assay were assembled for comparative anal. For the UCSD and Swiss TPH assays, there was strong concordance of at least 87% in identifying active and inactive compounds on one or more of the three days. When all three assays were compared at 72 h, concordance remained a robust 74%. Further, robust Pearsos correlations (0.48-0.68) were measured between the assays. Of those actives at 72 h, the UCSD, Swiss TPH and FIOCRUZ assays identified 86, 103 and 66 compounds, resp., of which 35 were common. Assay idiosyncrasies included the identification of unique compounds, the differential ability to identify known antischistosomal compounds and the concept that compounds of interest might include those that increase metabolic activity above baseline. The inter-assay data generated were in good agreement, including with previously reported data. A common set of antischistosomal mols. for further exploration has been identified[Figure not available: see fulltext.].

Parasites & Vectors published new progress about Chemotherapy. 55981-09-4 belongs to class esters-buliding-blocks, name is 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate, and the molecular formula is C12H9N3O5S, Application In Synthesis of 55981-09-4.

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

Sayed, Ahmed M. published the artcileRepurposing of some anti-infective drugs for COVID-19 treatment: A surveillance study supported by an in silico investigation, SDS of cas: 55981-09-4, the main research area is human nitazoxanide doxycycline azithromycin silico investigation coronavirus.

The repurposing of nitazoxanide, doxycycline and azithromycin may be effective to improve the symptoms in mild and moderate COVID-19 subjects. This study aimed to detect and explain the efficacy of reusing of these drugs in treating COVID-19. The study was divided into two parts: clin. and computational parts. In the clin. part, 80 (30 females) subjects with reverse transcription-polymerase chain reaction-confirmed COVID-19 with mild and moderate symptoms were enrolled in the study. Subjects were treated with azithromycin or doxycycline, and nitazoxanide was added to the treatment if the subject had diarrhoea. Subjects were divided into four groups: Group 1: subjects treated with azithromycin (20 subjects); Group 2: subjects treated with doxycycline (20 subjects); Group 3: subjects treated with a combination of nitazoxanide and doxycycline (20 subjects); and Group 4: subjects treated with a combination of nitazoxanide and azithromycin (20 subjects). In the computational part, we docked the three drugs against all currently available COVID-19-related protein targets (viral and non-viral). Subsequently, top hits were subjected to mol. dynamic simulations (MDSs) (50 ns) and binding free energy calculations to further validate the docking experiments and to investigate the binding modes of the potential inhibitors. The symptomatic improvement of mild to moderate subjects was seen on the fifth day after starting treatment in Group 3 and Group 4 and on the seventh day in Group 2. However, for Group 1, the symptomatic improvement of mild to moderate subjects was not seen on the fifth day and required replacement by doxycycline to get the symptomatic improvement. None of the subjects needed intensive care admission and no deaths were reported. In silico, results were in good accordance with the clin. outcomes, where both nitazoxanide and doxycycline achieved the best docking scores against the viral ADP-ribose phosphatase (ADPRP) and the human Adaptor-Associated Kinase 1 (AAK1). MDSs revealed that both drugs were stable in their bindings indicating that they can be considered as lead mols. for targeting ADPRP and AAK1. The clin. and computational studies applied on three FDA-approved antimicrobials together with their recent clin. findings revealed that both nitazoxanide and doxycycline have great therapeutic potential against COVID-19. The future in vitro mechanistic investigation may confirm our primary computational outcomes, and in turn, these classes of compounds provide a promising starting point for further anti-COVID-19 therapeutics.

International Journal of Clinical Practice published new progress about Chemotherapy. 55981-09-4 belongs to class esters-buliding-blocks, name is 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate, and the molecular formula is C12H9N3O5S, SDS of cas: 55981-09-4.

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

Tang, Ke published the artcileChemometric analysis of Chinese red wines using stir bar sorptive extraction combined with GC-MS analysis, Product Details of C11H22O2, the main research area is red wine stir bar sorptive extraction chemometrics GC MS.

The aim of this work was to compare EG-Silicone and PDMS polymeric phases based on stir bar sorptive extraction method for the anal. of volatile compounds in Chinese red wines. The impact of vintages, regions and grape varieties on volatile compounds was also evaluated, and chemometric analyses were applied to achieve a possible differentiation of the wines. The results demonstrated that EG-Silicone Twister high correlation coefficients and low standard deviations were obtained for 58 major volatile compounds of wine by use of EG-silicon. Significant differences in the levels of certain volatiles were observed according to cultivars, vintages and geog. origins through anal. of variance. A satisfactory linear discriminant anal. resulted for red wines on the basis of cultivars, vintages and geog. origins was observed, in which the correct classification was 100% and the leave-one-out validation accuracy was 96.3%.

European Food Research and Technology published new progress about Chemometrics. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Product Details of C11H22O2.

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

Tang, Ke published the artcileChemometric analysis of Chinese red wines using stir bar sorptive extraction combined with GC-MS analysis, Application of Methyl octanoate, the main research area is red wine stir bar sorptive extraction chemometrics GC MS.

The aim of this work was to compare EG-Silicone and PDMS polymeric phases based on stir bar sorptive extraction method for the anal. of volatile compounds in Chinese red wines. The impact of vintages, regions and grape varieties on volatile compounds was also evaluated, and chemometric analyses were applied to achieve a possible differentiation of the wines. The results demonstrated that EG-Silicone Twister high correlation coefficients and low standard deviations were obtained for 58 major volatile compounds of wine by use of EG-silicon. Significant differences in the levels of certain volatiles were observed according to cultivars, vintages and geog. origins through anal. of variance. A satisfactory linear discriminant anal. resulted for red wines on the basis of cultivars, vintages and geog. origins was observed, in which the correct classification was 100% and the leave-one-out validation accuracy was 96.3%.

European Food Research and Technology published new progress about Chemometrics. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Application of Methyl octanoate.

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

McAdam, K. G. published the artcileA Combined Study of Headspace Volatiles using Human Sensory, Mass Spectrometry and Chemometrics, Quality Control of 140-11-4, the main research area is smokeless tobacco product volatile compound sensory perception chemometrics.

Abstract: Smokeless tobacco products (STPs) are widely used in certain parts of the world, yet there is limited understanding of how they are consumed, particularly the impact of chemosensory characteristics on their use. In order to develop an understanding of the drivers of STP use and product acceptability we conducted both human sensory panel testing and chem. analyses on a range of STPs. Free-sorting paired odor testing using sensory panellists identified similarities and clear differences between eleven different STPs. Headspace volatiles, analyzed by headspace solid-phase microextraction gas chromatog. mass spectrometry (HS-SPME-GC-MS), identified 20 to 70 components depending upon the STP. Key differences in headspace volatiles were found between STPs. For example, the headspace of Skoal Bandits Wintergreen was dominated by Me salicylate, while Marlboro Spice consists of a more complex profile including pinene, nicotine, eugenol and cymene. Chemometric Target Factor Anal. (TFA) and Hierarchical Cluster Anal. (HCA) of chem. and sensory data was used to deduce chem. drivers of sensory perceptions. The chemometric strategy used showed that headspace anal. is a complementary screening tool to sensory anal. in classification studies. This study is generic with applications across various product sectors that require routine human sensory panel evaluation.

Scientific Reports published new progress about Chemometrics. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Quality Control of 140-11-4.

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

Zhou, Yan published the artcileIdentification of Volatile Components in Tea Infusions by Headspace-Programmed Temperature Vaporization-Gas Chromatography-Mass Spectrometry (HS-PTV-GC-MS) with Chemometrics, Category: esters-buliding-blocks, the main research area is tea Volatile Component Mass Spectrometry.

In this work, the two-step headspace (HS) technique was applied to determine the actual volatile compositions of tea infusions. In order to eliminate the influence of water vapor to the gas chromatog.-mass spectrometry (GC-MS) anal. and enable the capability to determine the volatile compounds in water base samples, a programed temperature vaporizer (PTV) was employed for the addnl. pre-concentration of thee analytes. While using the reported method, the volatile compounds were retained by the absorbent packed in the PTV, while the water vapor was directly removed through the purge valve. Then the retained volatile compounds were splitlessly injected into the GC column, which means that very low detection limits were achieved with the newly developed method. The obtained results demonstrated that the reported protocol possessed excellent repeatability and stability for volatile compound determination, and a total of 94 volatile compounds were identified from 28 teas. Multivariate data anal. was performed to obtain insights into the relationship between volatile compounds composition of the teas and their types. The volatiles composition of tea was shown to be closely related to the processing techniques adopted. Furthermore, the characteristic volatile compounds of each tea type were also illustrated. All of the results demonstrated that the presented method is a reliable approach to analyze and discriminate various beverages.

Analytical Letters published new progress about Chemometrics. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Category: esters-buliding-blocks.

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

Afifi, Sherif M. published the artcileGas Chromatography-Mass Spectrometry-Based Classification of 12 Fennel (Foeniculum vulgare Miller) Varieties Based on Their Aroma Profiles and Estragole Levels as Analyzed Using Chemometric Tools, Application of Benzyl acetate, the main research area is Foeniculum fennel classification aroma estragole chemometrics GC MS.

Fennel (Foeniculum vulgare Miller) is a popular aromatic plant native to the Mediterranean basin and cultivated worldwide that is valued for the nutritional and health benefits of its fruits. Headspace solid-phase microextraction of 12 fennel accessions of cultivated (F. vulgare subsp. vulgare) and wild forms (F. vulgare subsp. piperitum) of different origins was carried out for assessing their volatile distribution. Fifty-four volatiles were identified, with ethers amounting for the major class at ca. 52-99% attributed to the abundance of (E)-anethole and estragole. Several subsp. vulgare accessions proved to be excellent sources of the chief aroma (E)-anethole (95.9-98.4%), whereas high levels of estragole at ca. 72% were observed in subsp. piperitum from Minia and Khartoum and must be considered in the safety assessment of fennel. Other volatile classes were detected including ketones, esters, aldehydes, alcs., and hydrocarbons (monoterpenes, sesquiterpenes, and diterpenes). Fenchone exceeded 15% of the total volatiles in some fennel specimens, linked to a conspicuous bitter aftertaste. The members of subsp. piperitum were more enriched in monoterpene hydrocarbons with sabinene found exclusively in these, while subsp. vulgare comprised a higher content of ethers. Principle component anal. determined isoterpinolene as a special component in subsp. piperitum. In all specimens from the same group, estragole was the most distinguished volatile compound according to the findings from orthogonal partial least squares-discriminant anal. The highest estimated estragole levels were detected in subsp. piperitum from Minia at 89.8 mg/g. This comparative study provides the first comprehensive insight into volatile profiling of 12 fennel fruit varieties.

ACS Omega published new progress about Chemometrics. 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

Lu, Kuan published the artcileNew insights from flavoromics on different heating methods of traditional fermented shrimp paste: The volatile components and metabolic pathways, Synthetic Route of 110-42-9, the main research area is fermented shrimp paste flavoromics heating method metabolic pathway.

Traditional Chinese fermented shrimp paste is popular with consumers for its unique seafood flavor and fermented aroma. However, different heating methods exerted various flavors, which directly affect consumer choice and the industrialization of shrimp paste. In this study, the effect of four heating methods (steaming, frying, microwaving, and IR) on volatile components of shrimp paste were compared by headspace solid-phase microextraction-gas chromatog.-mass spectrometry (HS-SPME-GC-MS), gas chromatog.-ion mobility spectrometry (GC-IMS) and chemometrics. Results showed that 96 volatile components were identified; The volatile components such as pentanal, Et acetate, di-Me disulfide, and propanal were the characteristic volatile components that could be distinguished between different heating methods. The concentration of phenols and alcs. decreased, and the concentration of ketones and aldehydes increased after heating. The effect of microwave heating on volatile components is closer to that of steaming and frying, while IR heating had the most significant impact on volatile components of shrimp paste. In addition, steaming, frying, microwaving, and IR heating improve the aroma quality of shrimp paste by promoting fat oxidation, protein degradation, the Strecker pathway, and the escape of sulfur-containing compounds Therefore, our results can provide theor. support for improving shrimp paste quality and consumer choice.

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

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

Sun, Ruixue published the artcileAuthentication and quality evaluation of not from concentrate and from concentrate orange juice by HS-SPME-GC-MS coupled with chemometrics, Category: esters-buliding-blocks, the main research area is orange juice chemometrics headspace solid phase microextraction GC MS.

Substituting of not from concentrate (NFC) orange juice with from concentrate (FC) orange juice is a novel adulteration problem. This study used headspace solid-phase microextraction-gas chromatog.-mass spectrometry coupled with chemometrics to discriminate between NFC and FC orange juices. Twenty-five compounds were identified as differential compounds for NFC and FC orange juice discrimination. During processing, concentration treatment is a key step for forming differential compounds After the treatment, 25 differential compounds decreased significantly. Among, trans-isopiperitenol (5.45 ± 0.79μg/L), Et butanoate (106.5 ± 7.24μg/L), Bu butanoate (3.60 ± 0.19μg/L), hexyl butanoate (2.82 ± 0.14μg/L), Et octanoate (5.04 ± 0.39μg/L), 1,3,8-p-menthatriene (4.97 ± 0.49μg/L), p-mentha-1,5,8-triene (4.82 ± 0.59μg/L), and limona ketone (5.00 ± 0.53μg/L) declined until they were undetectable. These 25 differential compounds can discriminate NFC and FC orange juices processed by thermal concentration and other sterilization methods. Based on the 25 differential compounds, a partial least squares discriminant anal. model was constructed to identify com. samples. 100% NFC and 86.67% FC com. orange juices were consistent with their labels. These results clarify the volatile differences in volatile compounds and their causes for NFC and FC orange juices and provide references for juice quality control.

LWT–Food Science and Technology published new progress about Chemometrics. 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