Biolarvicidal Potentials of the Methanolic-Leaf-Extracts of Selected Tropical Plant Species

Solvent residue such as hexane in foodstuff, especially edible oil could be considered as the undesirable substances when exceeds maximum residue limit (MRL). The aim of this study is to determine the hexane content in various brands of edible oils. Totally forty samples (23 brands) of different types of vegetable oils including frying oils (n=14), blended oils (n=13), sunflower oils (n=6), corn oils (n=5) and canola oils (n=2) from Iran´s market were analyzed for hexane content using solid phase microextraction gas chromatography equipped with a flame-ionization detector (SPME)-GC-(FID). The hexane residue was detected in thirty-six out of forty examined samples, ranged from lower than LOD to 42.6 µg/kg. However, in all of them hexane content were below the MRL of 1 mg/kg which set by the European Union.

Evaluation of Hexane Content in Edible Vegetable Oils Consumed in Iran

Solvent residue such as hexane in foodstuff, especially edible oil could be considered as the undesirable substances when exceeds maximum residue limit (MRL). The aim of this study is to determine the hexane content in various brands of edible oils. Totally forty samples (23 brands) of different types of vegetable oils including frying oils (n=14), blended oils (n=13), sunflower oils (n=6), corn oils (n=5) and canola oils (n=2) from Iran´s market were analyzed for hexane content using solid phase microextraction gas chromatography equipped with a flame-ionization detector (SPME)-GC-(FID). The hexane residue was detected in thirty-six out of forty examined samples, ranged from lower than LOD to 42.6 µg/kg. However, in all of them hexane content were below the MRL of 1 mg/kg which set by the European Union.

AGGREGATION-ENHANCED EMISSION OF DIBLOCK COPOLYMER CONTAINING TETRAPHENYLTHIOPHENE-QUINOLINE PENDANT FLUORPHORES BY SELECTIVE SOLVENT PAIRS

PSQu-PBS in THF/hexane increase with the increasing hexane content. Copolymer micelles formed in THF/hexane mixtures are supposed to have higher extent of aggregation, leading to more pronounced AEE effect than micelles formed in THF/ H 2 O . Time-resolved fluorescence spectroscopy was conducted on PSQu-PBS and PSQu solutions to evaluate the respective lifetimes involved in the excited monomer and aggregated species and to compare the extent of aggregation in all sample solutions. Solid PSQu-PBS samples prepared from 80 vol.%- H 2 O and –hexane solutions of PSQu-PBS were then inspected by TEM to reveal their morphological difference and its influence on the extent of aggregation leading to the AIE effect.