The acid-catalyzed cyclocondensation of N,N'-bisaryl (aryl = 2-pyrimidinyl, 2-pyrazinyl and 4-nitrophenyl) methanediamines 5a-c with aqueous formaldehyde in refluxing acetonitrile leads to the formation of the corresponding 1,3,5-triaryl-1,3,5-hexa-hydrotriazines 6a-c. The stoichiometric reactions of 2-aminopyrimidine and 2-amino-pyrazine with aqueous formaldehyde in acetonitrile under reflux c...

Background: Formaldehyde is a chemical that used in fixed tissues and bodies. Formaldehyde during dissection of cadaver, evaporate and be released. Studies have shown that the gas increase endogenous opioids, nitric oxide and cytokines in plasma. These impacts can affect on gonadotropin hormones. The aim of this study was to investigate possible changes in gonadotropin and epithelial cells of t...

OBJECTIVES Laboratory technicians, students, and instructors are at high risk, because they deal with chemicals including formaldehyde. Thus, this preliminary study was conducted to measure the concentration of formaldehyde in the laboratories of the University of Sharjah in UAE. MATERIALS AND METHODS Thirty-two air samples were collected and analyzed for formaldehyde using National Institute...

Many industrial activities utilise formaldehyde as a key chemical in organic synthesis including: synthesis of special chemicals such as pentaerythritol and ethylene glycol, synthetic resins, paper products, medicinal products and drugs and others, too numerous to mention. Therefore, effluents arising from these applications may contain significant amounts of formaldehyde. In a biodegradation e...

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...

Recent work (Berg, Rose, and Marvel, 1929-30) has shown that the essential amino acid, tryptophane, may be rendered unfit for supporting growth, either by benzoylation or by condensation with formaldehyde. The formaldehyde condensation product has been employed also by Jackson (1929) with a similar result. On the other hand, neither esterification with ethyl alcohol nor acetylation caused any d...

An electrochemical method based on the concept of a biosensor for the monitoring of ozone is described for first time. The proposed method includes two parts: a selective sorbent for ozone, that is, eugenol, and a formaldehyde amperometric biosensor mounted into a flow-through cell. Ozone adds rapidly to the double bond of the allyl group of eugenol, which has been immobilized onto a hydrophobi...

conclusions it looks that a. hirtifolium has antinociceptive effects that might be due to flavonoids and saponins in plant the analgesic effect of which was demonstrated previously. results allium hirtifolium extract at (200 mg/kg dosage), alone and in combination with aspirin, had shown antinociceptive effect in writhing, tail-flick, and formalin tests (p < 0.01). allium hirtifolium extract (a...