Tag: M.W=200-250

Huang, Bingqing published the artcileInvestigation of the pectin grafting with gallic acid and propyl gallate and their antioxidant activities, antibacterial activities and fresh keeping performance, SDS of cas: 121-79-9, the publication is International Journal of Biological Macromolecules (2021), 343-350, database is CAplus and MEDLINE.

In this paper, a method for the enzymic modification of pectin, in which gallic acid (GA) and Pr gallate (PG) were grafted onto pectin mols. in an aqueous/organic two-phase system catalyzed by lipase, was proposed. The potential reaction mechanism was explored through UV-Vis, FTIR and 1H NMR spectroscopic methods and d. functional theory. Results suggested that the lipase played a dual role during the modification by catalyzing the hydrolysis of Me ester bonds of pectin in the aqueous phase and the esterification between the 4-OH of GA and PG and the -COOH of pectin in the organic phase. Moreover, the effects of GA and PG on the antioxidant and the antibacterial activities of pectin were evaluated, and results showed that the antioxidant and the antibacterial activities of modified pectin were better than those of native pectin. The effect of modified pectin on the quality of fresh bass (Lateolabrax maculatus) was further studied. Results suggested that, compared to control group, the total viable count, histamine level, malondialdehyde content and acid value of bass fillets treated with modified pectin were significantly reduced, whereas the sensory score was significantly increased.

International Journal of Biological Macromolecules published new progress about 121-79-9. 121-79-9 belongs to esters-buliding-blocks, auxiliary class Natural product, name is Propyl 3,4,5-trihydroxybenzoate, and the molecular formula is C10H12O5, SDS of cas: 121-79-9.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Zhang, Jianxu published the artcileGender and individual information coded by insect pheromone analogs in preputial glands in male brandt’s voles Lasiopodomys brandtii, Computed Properties of 16974-11-1, the publication is Dongwu Xuebao (2007), 53(4), 616-624, database is CAplus.

The volatile composition of dichloromethane extracts of preputial glandular secretions (PGS) from intact and castrated male Brandt’s voles Lasiopodomys brandtii were analyzed by using gas chromatog.-mass spectrometry (GC-MS). Thirty-three volatile compounds were detected and were present in nearly all scent donors, and 27 had previously been reported as insect pheromone components. Castration did not eliminate any compounds; however, it significantly suppressed the relative quantity of ten early-eluting, low mol. weight components. These included seven saturated and unsaturated acetates, one hexanoate, and two saturated octanoates. In particular, E,E-farnesyl acetate (FA) was the most abundant compound in the PGS. FA and other components might be candidates for male-produced pheromones. Two-choice behavioral assays of females revealed that low concentrations of raw PGS (0.056%) and FA (5 ppm in water v/w) were attractive, whereas high concentrations (0.56% and 50 ppm, resp.) were repellent. This suggested that FA might act as a male pheromone in a dosage-dependent manner. Extremely high variability of the relative quantities of almost all detected compounds among individuals indicated the inter-individual dissimilarities of PGS and consequent possibilities to communicate individuality to other conspecific members.

Dongwu Xuebao published new progress about 16974-11-1. 16974-11-1 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is (Z)-Dodec-9-en-1-yl acetate, and the molecular formula is C4H7BrO2, Computed Properties of 16974-11-1.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Li, Ao published the artcileAntioxidant effects of gallic acid alkyl esters of various chain lengths in oyster during frying process, Category: esters-buliding-blocks, the publication is International Journal of Food Science and Technology (2021), 56(6), 2938-2945, database is CAplus.

Summary : The antioxidant effects of gallic acid (GA) and its alkyl esters including Me gallate, Et gallate, Pr gallate, Bu gallate (GA-C4), octyl gallate, lauryl gallate, hexadecyl gallate and octadecyl gallate in frying oil (soybean oil) and oyster during frying were investigated. Rancimat induction period (RIP) assay indicated GA and its alkyl esters effectively improved the oxidative stability of soybean oil according to the ‘polar paradox’; i.e., the antioxidant effects of the polyphenols decreased in lipid system with the increasing of hydrophobicity. Results also indicated that GA and its alkyl esters all effectively retarded lipid oxidation in oyster tissue according to parameters including RIP, peroxide value and ESR assays. Moreover, the antioxidant efficiency in oyster increased with the alkyl chain length until GA-C4, and thereafter, the antioxidant effects decreased, similar to the ‘cut-off effect’. This study provides basic data for improving the oxidative stability of seafood during frying.

International Journal of Food Science and Technology published new progress about 121-79-9. 121-79-9 belongs to esters-buliding-blocks, auxiliary class Natural product, name is Propyl 3,4,5-trihydroxybenzoate, and the molecular formula is C10H12O5, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Wang, Xiao-tian published the artcileSynthesis of p-guanidinobenzoic acid hydrochloride and its derivative camostat mesylate, COA of Formula: C12H15NO4, the publication is Jingxi Huagong (2004), 21(8), 597-599, database is CAplus.

P-Aminobenzoic acid is stirred with cyanamide in water-bath at 50 °C, and then aqueous HCI [w(HCI) = 5%] is dropped to precipitate p-guanidinobenzoic acid hydrochloride (I) in 76.4% yield. In the presence of DCC (N,N’-dicyclohexylcarbodiimide), I reacts at first at room temperature (25°) with N,N-dimethylcarbamoylmethyl p-hydroxyphenylacetate, then the product is purified by changing it to carbonic salt, at last methanesulfonic acid is added to adjust pH to 3 to give camostat mesylate in 64.4% yield. This method is simple, and the materials are easy to get.

Jingxi Huagong published new progress about 59721-16-3. 59721-16-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Phenol,Ester,Amide, name is 2-(Dimethylamino)-2-oxoethyl 2-(4-hydroxyphenyl)acetate, and the molecular formula is C19H17N2NaO4S, COA of Formula: C12H15NO4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Chen, Hongyi published the artcileCopper-Catalyzed C-S Coupling of Quaternary Ammonium Salts and Dialkylcarbamodithioic Acid Salts, SDS of cas: 3052-61-7, the publication is Asian Journal of Organic Chemistry (2020), 9(5), 773-777, database is CAplus.

An efficient synthesis of (chiral) alkyl dialkylcarbamodithioates via a CuI-catalyzed C-S cross-coupling reaction of (chiral) quaternary ammonium salts and (chiral) dialkylcarbamodithioic acid salts was developed. C-S coupling products were obtained with extremely high ee values and yields, with enantioenriched arylmethyl trimethylammonium triflates afforded the inverse absolute configuration.

Asian Journal of Organic Chemistry published new progress about 3052-61-7. 3052-61-7 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Amide, name is Benzyl diethylcarbamodithioate, and the molecular formula is C12H17NS2, SDS of cas: 3052-61-7.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Wang, Chan published the artcileOptimization of a pheromone lure by analyzing the peripheral coding of sex pheromones of Spodoptera frugiperda in China, Formula: C14H26O2, the publication is Pest Management Science (2022), 78(7), 2995-3004, database is CAplus and MEDLINE.

Sex pheromones of the fall armyworm, Spodoptera frugiperda, show differences in composition and proportions in different geog. populations, but always contain Z9-14:OAc as the major component. Odorant receptor neurons (ORNs) housed in the long trichoid sensilla (TS) of male antennae are essential to detect female-released sex pheromones in moths. In this study, we identified seven components from pheromone gland extracts of female S. frugiperda in the Yunnan population from China, including (Z)-7-dodecen-1-yl acetate (Z7-12:OAc), (Z)-9-tetradecenal (Z9-14:Ald), (Z)-9-dodecen-1-yl acetate (Z9-12:OAc), (Z)-9-tetradecen-1-yl acetate (Z9-14:OAc), (E)-11-tetradecen-1-yl acetate (E11-14:OAc), (Z)-11-tetradecen-1-yl acetate (Z11-14:OAc) and (Z)-11-hexadecen-1-yl acetate (Z11-16:OAc) at a ratio of 1.2:4:0.8:79.1:1.6:1.6:11.7 by gas chromatog. coupled with mass spectrometry. Gas chromatog.-electroantennog. detection showed that Z9-14:OAc, Z7-12:OAc and Z11-16:OAc are the male antennal active components. Peripheral coding of pheromones in males was investigated by single sensillum recording. Five functional neurons housed in three types of TS were identified based on profiles of neuronal responses, which are responsible for attractive component Z9-14:OAc, synergistic components Z7-12:OAc, Z11-16:OAc, interspecific pheromones (Z)-9-tetradecen-1-ol (Z9-14:OH) and (Z,E)-9,12-tetradecadien-1-yl acetate (Z9,E12-14:OAc), resp. Wind tunnel and field tests demonstrated that a ternary combination of Z9-14:OAc, Z7-12:OAc and Z11-16:OAc at a ratio of 88:1:11 shows the strongest attractiveness to males. An optimized pheromone blend of Z9-14:OAc, Z7-12:OAc and Z11-16:OAc in an 88:1:11 ratio was identified for monitoring the invasive pest S. frugiperda in China. Five functional ORNs encoding intra- and interspecific pheromones were identified in male antennae, of which three neurons encode attractive component Z9-14:OAc, synergistic components Z7-12:OAc and Z11-16:OAc, resp., and the other two neurons encode interspecific pheromones Z9-14:OH and Z9,E12-14:OAc, sep. 2022 Society of Chem. Industry.

Pest Management Science published new progress about 16974-11-1. 16974-11-1 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is (Z)-Dodec-9-en-1-yl acetate, and the molecular formula is C22H32O2, Formula: C14H26O2.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Hyatt, Joseph R. published the artcileComparison of antioxidant activities of selected phenolic compounds in O/W emulsions and bulk oil, Application In Synthesis of 121-79-9, the publication is Food Chemistry (2021), 129037, database is CAplus and MEDLINE.

Antioxidant activities of 1-o-galloylglycerol (GG), Pr gallate, rosmarinic acid (RA), tocopherols (TOC), and 1:1 combinations of GG/RA and GG/TOC were evaluated using in vitro assays including 2,2-diphenyl-1-picrylhydrazyl (DPPH·), 2,2-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS+.), and ferric reducing antioxidant power (FRAP). Soybean oil stripped of TOC was utilized as bulk oil and as the oil phase in O/W emulsions for accelerated oxidation test with the selected phenolic compounds Efficacies of antioxidants were evaluated by monitoring total oxidation (TOTOX) values and fatty acid profiles of oil and O/W samples during the accelerated oxidation In bulk oil, GG outperformed other singular antioxidants, preventing 39.04% of oxidation for ω-3 fatty acids with a TOTOX value of 166.68. In emulsions, TOC outperformed other singular antioxidants, preventing 38.04% of oxidation with a TOTOX value of 196.72. Considering the polarities of the antioxidants and our testing systems, these results provide supporting evidence for the polar paradox theory.

Food Chemistry published new progress about 121-79-9. 121-79-9 belongs to esters-buliding-blocks, auxiliary class Natural product, name is Propyl 3,4,5-trihydroxybenzoate, and the molecular formula is C10H12O5, Application In Synthesis of 121-79-9.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Golubev, V. B. published the artcileMechanism and kinetics of decomposition of thiocarbamate iniferters, HPLC of Formula: 3052-61-7, the publication is Vysokomolekulyarnye Soedineniya, Seriya A i Seriya B (1994), 36(2), 320-6, database is CAplus.

Mechanism and kinetics of photochem. decomposition (λ = 365 nm) of low- and high-mol.-weight thiocarbamate iniferters is studied by ESR at -196°C and by spin trap method at -30° and +15°. In both cases the decomposition proceeds through C-S bond cleavage with the formation of low-reactive thiocarbamyl radical and benzyl or polystyrene radical, resp. The photolysis rate of high-mol.-weight inifer (thiocarbamate-terminated polystyrene) decreases with the decrease in chain length.

Vysokomolekulyarnye Soedineniya, Seriya A i Seriya B published new progress about 3052-61-7. 3052-61-7 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Amide, name is Benzyl diethylcarbamodithioate, and the molecular formula is C12H17NS2, HPLC of Formula: 3052-61-7.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Kuchanov, S. I. published the artcileKinetics of radical polymerization with participation of iniferters (initiator-transfer-terminator agents), Category: esters-buliding-blocks, the publication is Doklady Akademii Nauk SSSR (1989), 309(2), 371-5 [Chem.], database is CAplus.

A generalized kinetic scheme is presented for polymerization with iniferters based on anal. of. literature and exptl. data. The scheme permits explanation of basic feature of the process. The exptl. data were obtained in the polymerization of styrene in the presence of PhCH₂SC(S)NEt₂ as iniferter.

Doklady Akademii Nauk SSSR published new progress about 3052-61-7. 3052-61-7 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Amide, name is Benzyl diethylcarbamodithioate, and the molecular formula is C12H17NS2, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Liu, Xiaotu published the artcilePlastic additives in ambient fine particulate matter in the Pearl River Delta, China: High-throughput characterization and health implications, COA of Formula: C10H12O5, the publication is Environmental Science & Technology (2021), 55(8), 4474-4482, database is CAplus and MEDLINE.

Elucidation of the chem. components of airborne fine particulate matter (PM_2.5) facilitates the characterization of atm. contamination sources and associated human exposure risks. In the present study, we employed a high-throughput anal. approach to investigate the abundance and distribution of 163 plastic additives in ambient PM_2.5 collected from 94 different sites across the Pearl River Delta region, China. These chems. are from six categories, including organophosphate esters (OPEs), phthalate esters (PAEs), PAE replacements, bisphenol analogs, UV stabilizers, and antioxidants. Ninety-three of them exhibited a detection frequency greater than 50% in PM_2.5, while the combined concentrations of target plastic additives ranged from 610 to 49,400μg/g (median: 3500μg/g) across sites. By category, concentrations of PAEs (median: 2710μg/g) were one to three orders of magnitude greater than those of other groups, followed by PAE replacements (540μg/g) and OPEs (76.2μg/g). Chem.-dependent exposure risks to PM_2.5-bound plastic additives were characterized via the estimated daily intake and hazard quotient (HQ) approaches, which resulted in two different risk prioritization systems. Although the HQ approach suggested no or very low health concerns when considering individual chems., the complexity of co-concurrent chems. in PM_2.5 raises the concern on potential health risks from exposure to airborne particles and a cocktail of chem. components.

Environmental Science & Technology published new progress about 121-79-9. 121-79-9 belongs to esters-buliding-blocks, auxiliary class Natural product, name is Propyl 3,4,5-trihydroxybenzoate, and the molecular formula is C10H12O5, COA of Formula: C10H12O5.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics