Neutral Alumina (neutral + alumina)

Distribution by Scientific Domains


Selected Abstracts


ChemInform Abstract: Reaction of Isatins with Active Methylene Compounds on Neutral Alumina: Formation of Knoevenagel Condensates and Other Interesting Products.

CHEMINFORM, Issue 23 2009
Manas Chakrabarty
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]


An Expeditious Approach to Knoevenagel Condensation of Meldrum,s Acid on Neutral Alumina Using Microwave Irradiation.

CHEMINFORM, Issue 22 2007
Manas Chakrabarty
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]


Determination of methylene blue residues in aquatic products by liquid chromatography-tandem mass spectrometry

JOURNAL OF SEPARATION SCIENCE, JSS, Issue 23-24 2009
Jin-Zhong Xu
Abstract A method for the determination and confirmation of methylene blue (MB) in aquatic products was developed. Residues of MB were extracted from homogenized tissues with acetonitrile/sodium acetate buffer solution, and simply cleaned up with dichloromethane liquid/liquid extraction. After concentration and dissolution, the sample solutions were cleaned up by the neutral alumina and weak cation-exchange solid phase extraction (SPE) cartridge, prior to LC-MS/MS analysis. MB was determined at 1.0,20,,g/kg in eel, toasted eel and shrimp, with a limit of quantification of 0.5,,g/kg. Recovery for MB was between 73.0% and 108.3%. This method is fast, exact and sensitive. It can be applied to determine MB in aquatic products. [source]


Two-dimensional coordination polymer matrix for solid-phase extraction of pesticide residues from plant Cordia salicifolia

JOURNAL OF SEPARATION SCIENCE, JSS, Issue 12 2009
Pedro Henrique Viana de Carvalho
Abstract The 2D coordination polymer (,[Gd(DPA)(HDPA)]) was tested for extraction of acephate, chlorpropham, pirimicarb, bifenthrin, tetradifon, and phosalone from the medicinal plant Cordia salicifolia, whose extracts are commercialized in Brazil as diuretic, appetite suppressant, and weight loss products, using GC/MS, SIM. Considering that there are no Brazilian regulations concerning maximum permissible pesticide residue concentrations in medicinal herbs, recovery experiments were carried out (seven replicates), at two arbitrary fortification levels (0.5 and 1.0 mg/kg), resulting in recoveries in range of 20 to 107.7% and SDRSDs were between 5.6 and 29.1% for ,[Gd(DPA)(HDPA)] sorbent. Detection and quantification limits for herb ranged from 0.10 to 0.15 mg/kg and from 0.15 to 0.25 mg/kg, respectively, for the different pesticides studied. The developed method is linear over the range assayed, 0.5,10.0 ,g/mL, with correlation coefficients ranging from 0.9975 to 0.9986 for all pesticides. Comparison between ,[Gd(DPA)(HDPA)] sorbent and conventional sorbent (neutral alumina) showed similar performance of ,[Gd(DPA)(HDPA)] polymeric sorbent for three (bifenthrin, tetradifon, and phosalone) out of six pesticides tested. [source]