Substituted Organotin Complexes of 4-Methoxybenzoic Acid for Reduction of Poly(vinyl Chloride) Photodegradation

Poly(vinyl chloride) suffers from degradation through oxidation and decomposition when exposed to radiation and high temperatures. Stabilizers are added to polymeric materials to inhibit their degradation and enable their use for a longer duration in harsh environments. The design of new additives to stabilize poly(vinyl chloride) is therefore desirable. The current study includes the synthesis of new tin complexes of 4-methoxybenzoic acid and investigates their potential as photostabilizers for poly(vinyl chloride). The reaction of 4-methoxybenzoic acid and substituted tin chlorides gave the corresponding substituted tin complexes in good yields. The structures of the complexes were confirmed using analytical and spectroscopic methods. Poly(vinyl chloride) was doped with a small quantity (0.5%) of the tin complexes and homogenous thin films were made. The effects of the additives on the stability of the polymeric material on irradiation with ultraviolet light were assessed using different methods. Weight loss, production of small polymeric fragments, and drops in molecular weight were lower in the presence of the additives. The surface of poly(vinyl chloride), after irradiation, showed less damage in the films containing additives. The additives, in particular those containing aromatic (phenyl groups) substitutes, inhibited the photodegradation of polymeric films significantly. Such additives act as efficient ultraviolet absorbers, peroxide quenchers, and hydrogen chloride scavengers.

Total Synthesis of C-8 Hydroxyl Substituted Lomefloxacin as the Photolysis Impurity

Objective: Photochemical decomposition of lomefloxacin (Lom) is supposed to result in the generation of C-8 substituted impurity and accompanied fluoride. The existence and amount of C-8 hydroxyl substituted Lom could be proposed as the marker to the stability and process consistency. The specific C-8 hydroxyl substituent impurity (1-ethyl-6-fluoro-8-hydroxy-7-(3-methylpiperazin-1-yl )-4-oxo-1,4-dihydroquinoline-3-carboxylic acid) was designed and synthesized to be available. Method: 2,4,5-trifluoro-3-methoxybenzoic acid as the initial reactant was subjected to a series of seven-step reactions, such as acylation, condensation with trans N,N-dimethylamino ethyl acrylate, N-ethylation, cyclization, hydrolysis, condensation with piperazine and acidification. The resultant substance was then purified using HPLC and C18 solid-phase extraction. The structure of C-8 hydroxyl substituted Lom was identified with 1H-NMR, 13C-NMR and HRMS spectroscopes, as well as the purity was determined by HPLC. Conclusion: C-8 hydroxyl substituted Lom was successfully synthesized and purified with purity more than 96%. This photolysis impurity offers an alternative for not only further generic Lom active pharmaceutical ingredient development involved in quality control and consistency evaluation, but also research for the mechanism underlying Lom-induced photosensitivity.

Phyto-Chemical Studies of Methanol Extract of Tinospora cordifolia Leaf by GC-MS

Plants are the almost exclusive source of drugs for the majority of the world population. The present study was carried out to investigate the phytoconstiuent of the Tinospora cordifolia leaf which contain alkaloids, flavanoids, steroidal glycoside, terpenoids and sterol are confirmed by preliminary phyochemical studies. GC-MS analysis of methanol extract of the plant Tinospora cordifolia leaf showed the presence of 15 bio active compounds. They are 4H-Pyran-4-one, 2,3-dihydro-3,5- dihydroxy-6-methyl,1,2,3- propanetriol,2-methoxy-4-vinylphenol, Benzene, 1-(2-chloroethyl)-2-(trifluoromethyl),3-Hydroxy-4-methoxybenzoic acid, nHexadecanoic acid, Hexadecanoic acid, ethyl ester,9,12-Octadecadienoic acid (Z,Z)-,methyl ester, Oleic Acid, Linoleic acid ethyl ester,9-octadecenoic acid (z)-, ethyl ester, octadecanoic acid, ethyl ester,2,4-imidazolidinedione, 5,5- diphenyl-, hexadecanoic acid, 2-hydroxy-1-(hydroxymethyl)ethyl ester.

A Review of the Pharmacological Characteristics of Vanillic Acid

A dihydroxybenzoic acid analog used as a flavoring agent is vanillic acid (4hydroxy-3-methoxybenzoic acid). It's a form of vanillin that has been oxidized. It's also a step in the process of making vanillin from Ferulic Acid. Vanillic acid has seen a lot of press because of its many uses in the cosmetics, fruit, flavorings, cigarettes,alcohols, drinks, and polymer sectors. It's said to have effective antioxidant, anti-inflammatory, and neuroprotective properties. The pharmacological impact on oxidative stress-induced neuro-degeneration, on the other hand, have not been thoroughly examined. The pharmacological properties of vanillic Acid lead to its possible use in the treatment of various diseases. Keywords: Vanillic acid, Pharmacological Potential, wound healing, Antioxidants

in situ Chemical Synthesis of PANI by Using Aromatic Carboxylic Acid as Dopant for Detection of Ammonia at Room Temperature

In this work, polyaniline (PANI) film was successfully synthesized by in situ chemical polymerization technique by using aromatic carboxylic acids like benzoic acid, p-methoxybenzoic acid and p-nitrobenzoic acid, doped in presence of ammonium persulphate as an oxidant. Electric conductivity study of doped polyaniline has been studied concerning temperature. Surface composition morphology and structure of synthesized carboxylic acid doped polyaniline were characterized via different methods such as the electrical conductivity by two probes, UV-vis spectroscopy, FTIR spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The PANI based ammonia gas sensor was synthesized by using, benzoic acid, p-methoxybenzoic acid and p-nitrobenzoic acid as dopant which has excellent selectivity towards NH3 and 28, 426 and 327% response of ammonia gas at 100 ppm concentration, respectively at room temperature.

Phytotoxicity in soybean crop caused by simulated dicamba drift

The objective of this work was to evaluate injury symptoms on soybean not tolerant to dicamba (3,6-dichloro-2-methoxybenzoic acid), as well as crop yield, after the application of sub-rates of the herbicide to simulate physical drift in tropical conditions. Dicamba rates of 0, 5.8, 14.4, 28.8, 57.6, and 576 g acid equivalent per hectare were applied at the vegetative (V3) and reproductive (R1) stages of soybean, using a backpack sprayer pressurized with CO2, equipped with air-induction flat fan spray nozzles; the pressure and rate of application were 250 kPa and 200 L ha-1, respectively. Visible injury, the soil-plant analysis development (SPAD) index (leaf chlorophyll content) at 14 days after herbicide application, and soybean crop yield were evaluated. These variables were influenced by the crop stage in which the dicamba rates were applied. Rates below 28.8 g ha-1 caused less injury to soybean when applied at the R1 stage; however, there were no differences in yield between stages. A 1% dicamba drift in tropical conditions reduces soybean yield by 12%.