An HPLC-DAD method was developed for the determination of formaldehyde in animal feed and silage. The is based on product chemical reaction between 2,4-dinitrophenylhydrazine. A 3 g or silage were extracted with Milli-Q water phosphoric acid next derivative use 2,4-dinitrophenyl- hydrazine acetronitrile solution. extract purified 0.45 µm syringe filters separeted Zorbax Eclipse XDB C18 column d...

Via the one-pot condensation reaction of ethyl acetoacetate, aromatic aldehydes, 2,4-dinitrophenylhydrazine, and β-naphthol; new pyrazolone derivatives were synthesized in the presence of three Brønsted acid catalysts. These Brønsted acid catalysts are Silica sulfuric acid (SSA), tetra-n-butyl ammonium hydrogen sulfate (TBAHSO4) and [2,2′-Bipyridine]-1,1′-diium tricyanomethanide {[2,2′-BPyH][C(...

In a vision to develop new synthetic routes for the preparation of energetic materials, two benzoxazine monomers were synthesized via two-step Mannich reaction process involving incorporation nitrogen–nitrogen bonds and explosophore groups (NO 2 ) into monomer backbone. The molecular structures confirmed by 1 H NMR, Fourier transform infrared elemental analysis techniques. curing behavior degra...

The research involved a rapid, automated and highly accurate developed CFIA/MZ technique for estimation of phenylephrine hydrochloride (PHE) in pure, dosage forms biological sample. This method is based on oxidative coupling reaction 2,4-dinitrophenylhydrazine (DNPH) with PHE existence sodium periodate as oxidizing agent alkaline medium to form red colored product at ʎmax )520 nm (. A flow rate...

About 10 years ago, King, Longenecker, and their associates made the interesting observation that the urine of rats subsisting on a milk diet which was supplemented with a non-saponifiable fraction from oat oil, grass leaf oil, or alfalfa leaf oil (2) or with certain terpenes (3) or hypnotics, particularly chloretone (4), contained considerable quantities of a reducing substance. This reducing ...

Aims: To develop and validate two assay methods for the determination of total and free formaldehyde content in cosmetics by Colorimetric and High Performance Liquid Chromatographic (HPLC) methods, respectively. Study Design: Colorimetric and HPLC methods. Place and Duration of Study: Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Dhaka, Dhaka-1000, Bangladesh; betw...