JBCS

The continuous and indiscriminate use of pesticides facilitates its occurrence in sugarcane derivatives. This work describes a method for determination of pesticides belonging to different chemical classes in sugarcane honey employing the QuEChERS method for extraction and quantification by liquid chromatography

It was observed that mango leaves emit myristicin, dillapiole, eugenol and eugenol acetate phenylpropanoids as a response to abiotic and biotic stresses. This present investigation contributes to the discovery of new natural insecticides

This figure shows the steps of the refining of buriti oil (Mauritia flexuosa)

This study shows that the low specificity of the USP (United States Pharmacopeia) dissolution conditions for the discrimination of the mebendazole polymorphs gives rise to the widespread different crystal forms in generic tablets. In addition, it was verified that polymorphs A and C exhibit different behaviors in the investigated dissolution media

Dichloroiodoisocyanuric acid was prepared in 93% and proved to be very efficient for electrophilic iodination of activated arenes and coiodination of alkene with oxygenated nucleophiles

The present paper reports the UV-assisted degradation of 1,4-benzoquinone in ZnO suspensions. In the study, 1,4-benzoquinone photodegradation was independent of pH, the photoactivity of ZnO was maximum at 1.0 g L^-1 concentration and particularly at 100 mg L^-1 1,4-benzoquinone levels. Within pH 4-10 more than 80% of 1,4-benzoquinone can be removed

This f igure indicates that some of the natural antioxidants can significantly improve the oxidation stability of soybean based biodiesel, even better than synthetic antioxidants

Nano-Ag particles loaded on TiO₂ (Ag-TiO₂), unmodified TiO₂ and ZnO were used as catalysts for the UV-induced cold vapour generation with formic acid coupled to atomic absorption for determination of total mercury in analytical samples

Palladium complexes based on cyclophosphazene-based ligands were tested in Suzuki coupling reactions. Complex N₃P₃(O-C₆H₄-p-PCy₂)₆/Pd₃(dba)proved to be robust (could be kept in solution, at room temperature, for at least one week) and could be used in low loadings, affording turnover numbers as high as ca. 17,500 for the coupling of 2-bromotoluene with chlorophenylboronic acid

Quantitative extraction of alkylphenols (APs) and alkylphenol ethoxylates (APEs) from biosolids using pressurized solvent extraction (PSE) was optimized by central composite design, considering the variables: temperature, time and extraction solvent. After optimization, the following optimal values were obtained: 129 ºC, 38 min in 2 cycles and acetone as extraction solvent

Sugarcane leaves were analysed by ¹H nuclear magnetic resonance spectroscopy and chemometrics. Different cultivars were discriminated by this methodology according to sugar content, especially sucrose and glucose

The first total synthesis of 1-hydroxydehydroherbarin and ascomycones A, B is reported. The biologically interesting ascomycones A, B were obtained in 18% overall yield starting from 3-chloro-2,5-dimethoxybenzaldehyde (10) as building block

A diastereoselective approach for the synthesis of 2-amino-1,3-propanediols from Morita-Baylis-Hillman is disclosed herein. The method is based on an ozonolysis reaction to provide 2-oxo-1,3- propanediol derivatives which were used in a reductive amination step

The matrix effect in gas chromatographic analysis is attributed to the presence of coextractives in the organic phase obtained in the extraction process. This work reveals that the internal standard method reduces but does not eliminate this effect

Two new furanoflavonoids (5-hydroxy-2''-isopropenyl-3-methoxyfurane-(2",3":7,8)-flavone and 5-hydroxy-2''-(1-hydroxy-1-methylethyl)-3-methoxyfurane-(2",3":7,8)-flavone) together with twelve known flavonoids and one triterpene were isolated from Lonchocarpus obtusos

Two gas chromatographic methods (gas chromatography-mass spectrometry in selective ion monitoring mode (GC-MS-SIM) and gas chromatography-electron capture detector (GC-ECD) were developed, validated and compared for the determination of residues of organochlorine and organophosphoruspesticides in Brazilian citrus essential oils (EOs). Solid phase extraction (SPE) was used for pre-concentration of pesticides. The analysis of fifteen Brazilian commercial EOs showed that 40% (six samples) presented contamination above the allowed maximum residue limit (MRL)

In the present study the interactions between paracetamol (PC) and human serum albumin, in non-glycated (HSA) and glycated form (GHSA), were investigated using continuous cyclic voltammetry in acetate buffer pH 7.4. at the figure the cyclic voltamogram of PC alone(a) after adding the protein has been shown (b,c)

A sensitive kinetic method based on catalytic effect of organophosphorus pesticides malathion(A), dimethoate(B) and phorate(C)) on the oxidation of LCV (leuco crystal violet) by potassium iodate in hydrochloric acid medium to give a violet colored dye. The catalytic activity is mainly exhibited by thiophosphoryl compounds and depends on the nature of the P=S bond

The graphical abstract shows the influence of the P content on hardness and on the corrosion resistance of the electrodeposited Ni-Mo-P. The results show that the addition of P is beneficial for the hardness and corrosion resistance properties of the Ni-Mo-based coatings and the Ni₇₈Mo₁₀P₁₂ sample presented the best hardness and corrosion-resistance properties

Marine microorganisms from Eudistoma vannamei presenting Streptomyces sp. able to generate staurosporine with significant cytotoxic activity against human cancer lines

A short and efficient approach to the C1-C9 fragment of the potent antitumor agent dictyostatin is described

Two new Lycopodium alkaloids, acetyllycoserramine M and palcermine A, were isolated from Palhinhaea cernua L. Their structures were elucidated by spectroscopic methods and single-crystal X-ray diffraction analyses

Two new alkaloids were isolated from P. prunifolia besides the known alkaloids. Two known compounds exhibited in vitro inhibitory activity against Leishmania amazonensis with IC₅₀ values of 16.0 and 40.7 μgg per mL

Solanum steroidal alkaloids occur almost exclusively with 3β-OH and are commonly found in its glycosylated form. On the other hand, there is only one report of a 3β-N-formyl substituent with a solanidane-type skeleton. Caavuranamide (from S. caavurana Vell.) is the second report of an N-formyl steroidal alkaloid in this genus, and the first with a spirosolane-type skeleton

Clay soils have been degraded after treatment by Fenton's reagent, decreasing its cation exchange capacity (CEC), which may cause long-term soil infertility because of reduced capacity to retain water and nutrients