JBCS

Scheme of Candida rugosa lipase immobilization on cellulose supports, like make-up remover pads, using sodium periodate as activating agent. The biocatalyst was used for the removal of the stratified aged linseed oil from canvas surfaces

Poly(2,6-diaminopyridine) on the surface of carbon nanotubes/GC electrode shows excellent electrocatalytic activity towards the oxidation of ascorbic acid, dopamine and uric acid. The graphical abstract shows the cyclic voltammograms of 2,6-DAP electro-polymerization over the range of -0.3 to 1.2 V at 50 mV s^-1 for 20 cycles

A headspace single drop microextraction (HS-SDME) coupled to gas chromatography flame ionization detection (GC-FLD) method was used for the determination of biphenyl and biphenyl oxide

It is reported the study of a liquid sample from the pyrolysis of wood. The analysis was performed by gas chromatographs with flame ionization detector (GC-FID) and mass spectroscopy (GC-MS). The chromatographic profile corresponds to a sample of a commercial fertilizer. Syringol, 1,2,3-trimethoxybenzene, metoxy-2-4-methylphenol and o-guaiacol were the most abundant substances in the product

Evaluation of the polyphenolic content and antioxidant activity of orange and multifloral honey extracts was carried out by different assays. Orange honey extracts showed higher antioxidant activities and phenolic contents than multifloral honey extracts

Principal component analysis was completed to examine the metal concentrations in total suspended particle (TSP) and PM₁₀ and PM_2.5 particulate matter samples, which were collected at an urban location that was strongly influenced by vehicular traffic. Our results reflect the various sources contributing to the composition of particulate matter

The complex modulus (G*) as a function of frequency for SBS (styrene-butadiene-styrene) modified binder (MB) and SBS/organoclays MB (as intercalated nanocomposite) showed higher values of G* when compared to the pure binder at higher temperature-low frequency. Consequently, MBs seems to be more resistant to rutting or permanent deformation

The electrostatic component of the Li⁺-L interaction (L = phosphoryl, carbonyl, imino or thiocarbonyl ligand) determines the intensity of the metal-ligand interaction enthalpy

Three new phenylpropanoids, feddeiketones A-C, were isolated from the leaves and stems of Daphne feddei, and have modest cytotoxic and anti-HIV-1 activities

The matrix effect in residue analyses is one of the main problems at the time of the identification and quantification because it affects by far the reproducibility and accuracy of the method. This paper describes the influence of different matrices, clean-up sorbents, extraction solvents and the analyte/matrix ratio on the ionization process at UFLC-MS

Caffeine presents a single oxidation peak at approximately +1.5 V (vs. SCE), due to an oxidation mechanism similar to xanthine, however without formation of uric acid since the nitrogen atoms at positions 3 and 7 are substituted. The oxidation occurs via a 4 electrons process resulting in a substituted uric acid (IV) that is electro-inactive

Esters, as the major and higher impact odor compounds of a typical base wine from Serra Gaúcha in a total ion current chromatogram, obtained through headspace solid phase microextraction and gas chromatography with mass spectrometric detector

A particularly useful and concise synthesis of 3-styryl coumarins in good to high yields using Heck coupling reactions between 3-vinyl-6,7-dimethoxycoumarin and aryl halides

A method based on ultrasound-assisted surfactant-enhanced emulsification microextraction (UASEME) was proposed to determine estrogens in water. Significant enrichment factors were found, 85.29 for 17ß-estradiol (ßE2), 173.45 for estrone (E1) and 97.05 for diethylstilbestrol (DES)

The treatment of Nb⁵⁺ soluble salts with H₂O₂ makes the solution yellowish due to the formation of peroxo-niobium groups. The color change was also observed with solid material

A fast and interference free FAAS method for the determination of Ca and Mg in honeys using the solid phase extraction and the two-step elution was developed. It maintained the precision of 1-5% and the accuracy of 1-3%. The limits of detection of 24 ng g^-1 of Ca and 4.4 ng g^-1 of Mg were obtained

Zn, Cu, Cd and Ni exhibit higher concentrations in the sediments within the city. The elements Mn and Fe showed higher concentrations in sediments collected outside the urban area and this result may be attributed to contributions from agricultural activities

Emission spectrometry (ICP OES) was used to determine the mineral composition of bee pollen from different Brazilian regions. Brazilian bee pollen may be considered a rich source of Mn and Se and a source of Cu, P and Zn. The elements Ca, Cu, Fe, K, Mg, Mn, Na, P and Zn were important in explaining the classification of pollen according to their geographical origin. The mineral levels varied widely during the year

Venn diagrams illustrating the amount of variation in M. cauliflora fruit chemical composition explained by edaphic and spatial predictor variables and joint effects

Selective interactions between proteins and nanomaterials are of interest for the fabrication of biochips with applications spanning from diagnostics to electronics. This study reports the preparation of block copolymer nanodomains featuring phosphonic diacid groups, which were previously shown to reversibly bind to Annexin-A5 proteins

The operating conditions of an inductively coupled plasma optical emission spectrometer were optimized for the determination of REEs using a Doehlert design and the signal-to-background ratio (SBR) of the REEs emission signals and the Mg II/Mg I line intensity ratio were evaluated as response functions

Two high-performance liquid chromatographic (HPLC) methods with ultraviolet detection are described: one for simultaneous determination of total amounts of triacylglycerides, diacylglycerides, monoacylglycerides and fatty acid methyl esters (FAME) in alcoholysis of different oils, and the other one suitable for determining the fatty acid composition of oils analyzing their methyl ester derivatives

Novel designed 2,1,3-benzothiadiazole (BTDs) derivatives were synthesized and tested as selective fluorescent cell markers. The first pi-extension was responsible for the cellular selection (mitochondrial selection) while the second pi-extension resulted in a pronounced "light up" effect. The rationally designed derivative (BTDShiny) was tested to monitor a key cellular process (cell division cycle) using MCF-7 cancer cell lines (human mammal cells), thus allowing future studies of cancer cell death and their processes that are highly associated with mitochondrial stability

The major meroterpenes isolated from Peperomia oreophila Hesch. and Peperomia arifolia Miq. have in common the aromatic moiety derived from orsellinic acid

The collision/reaction interface (CRI) with He introduced through the skimmer at 100 mL min^-1 is employed to improve ICP-QMS accuracy in ³¹P⁺ determinations. Cool plasma conditions for the determination of ³¹P¹⁶O⁺ result in limits of detection 55-fold lower. This strategy is an interesting alternative for high ionization potential elements such as P