JBCS

The schematic representation is a possible chemical composition of PHAs produced by fermentation of GBRB in shake flasks (35 °C, 72 h, 180 rpm) by Cupriavidus necator IPT 026.

Herbicide release was shown to be dependent on medium pH: in release tests using different pHs, medium acidification accelerated release and tablet deformation according to acid strength.

This article describes the development of a HPLC-DAD based method for the isolation, identification, and quantification of three flavonoids in the hydroethanolic extract of the aerial parts of Tonina fluviatilis and evaluation of their radical scavenging activity by a DPPH based assay.

A dispersive liquid-liquid microextraction procedure coupled to spectrophotometry is described for the determination of the trace levels of Sudan Blue II.

X-ray diffraction (refined with the program FullProf / routine Le Bail) for iron(III) 57 acetate, formula [⁵⁷Fe₃O (CH₃COO)₆ (H₂O)₃]CH₃COO or Ac⁵⁷Fe, showed that the space group that best refines the X-ray diffraction pattern of the compound is C2/c.

Six diaryltriazene compounds bearing different substituent groups were tested for antibacterial activity and toxicity toward Artemia salina. MIC results were good to very good, in the range 8 to 128 µg mL^-1. Toxicity was about 10-fold lower than DTIC for three compounds.

A rapid analytical method using HPLC for the quantification of xanthyletin content in biodegradable polymeric nanoparticles has been developed and validated.

Chemical study of the orchid Maxillaria picta allowed the isolation of the bioactive stilbenes phoyunbene B and phoyunbene C, which were evaluated for anticancer activity against human tumor cell lines and against evolutionary forms of T. cruzi and L. amazonensis.

Bismuth vanadate, a semiconductor, when irradiated with visible light promotes discoloration of dyes leading to a decrease in their concentration as a function of irradiation time.

Density functional theory B3LYP investigations of the pressure-induced phase transition of PbTiO₃ material revealed that the transition state of this process displayed a tetragonal symmetry, and spontaneous polarizations changed under pressure.

This report describes a study about the feasibility of using a conventional digital camera, a cell-phone camera, an optical microscope, and a scanner as digital image capture devices for colorimetric measurements in laser-printed microzones on transparency films.

Schematic representation of a closed system containing a liquid phase, a gaseous phase, and fiber-coating phase. SPME is a technique for extraction and concentration of analytes for posterior analysis on analytical equipment such as GC or HPLC.

Cloud point extraction combined with spectrofluorimetric detection was used to extract and determine triamterene in human urine samples, and was found to be a promising method for monitoring drugs for pharmaceutical and clinical purposes.

Leaves and branches of Tapirira guianensis (Anacardiaceae) afforded three different types of oils: I) β-selinene/α-selinene, II) (E)-caryophyllene, and III) β-sesquiphellandrene/α-zingiberene. This is the first report on the volatiles of this tree.

Nanoemulsions stabilized by rapeseed or sunflower lecithins demonstrated similar physicochemical properties to the egg lecithin-based formulations obtained by spontaneous emulsification or high-pressure homogenization procedures.

The environmental fate of pesticides depends on its physical-chemical properties, application method, soil characteristics and climate. The pesticide can reach the ground water and contaminate river and lakes, affecting the living organisms.

2H-MoS² having a layered structure is able to be exfoliated through several chemical or physical methods and the obtained single layers can be used in several branches of science and technology.

Grape Juice Quality Control by Means of ¹H NMR Spectroscopy and Chemometric Analyses.

Would you like to make serpent eggs which vivify? These eggs are basically comprised of sugar and sodium bicarbonate. In the past, mercuric thiocyanate was used for this experiment and its decomposition had generated ash very more times longer than the eggs. Interesting, yet toxic.

The physical alterations in poorly stored drugs represented in the picture were the framework by which several questions were raised. Thus, undergraduate students have to connect all the information, and investigate and test their hypotheses to solve the problem.

This work proposes the use of the modified V diagram as a report in practical classes of general chemistry to assist students in establishing relationships between theoretical/conceptual and methodological knowledge concerning objects and/or events studied.

The topic "Green Chemistry" has gained great importance over recent years, being quoted in an increasing number of publications. This fact shows how concern over developing "greener" processes has played a prominent role in the scientific community.