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我在故我思
第1楼2008/05/07
Determination of Triazines and Atrazine Metabolites in Soil by Microwave-Assisted Solvent Extraction and Highpressure Liquid Chromatography with Photo-Diode-Array Detection
Nataša Kovačić, Helena Prosen, and Lucija Zupančič-Kraljb
Abstract
With our study microwave-assisted solvent extraction followed by chromatographic separation and quantification of selected triazines and atrazine metabolites were used. Soil matrix interferences negatively influenced the quantitation step, narrowing the linear range of the method. With the optimized microwave-assisted solvent extraction using 50:50 methanol/water mixture as the extraction solvent recoveries in the range 67-130% were reached, depending on the soil and the compound. The energy of microwaves was high enough to break down almost all sorption bonds between triazines/metabolites and soil.Due to matrix interferences desethyldesisopropylatrazine, desisopropylhydroxyatrazine and desethyldesisopropylhydroxyatrazine could not be determined. While higher organic matter content in soil seemed to slightly decrease the desorption, no correlation was proven between the clay content or soil pH and extraction efficiency. 全文下载
我在故我思
第2楼2008/05/07
Microwave Assisted Extraction – An Innovative and Promising Extraction Tool for Medicinal Plant Research
Vivekananda Mandal, Yogesh Mohan, S. Hemalatha
ABSTRACT
In recent years, the use of microwave for extraction of constituents from plant material has shown tremendous research interest and potential. Conventional techniques for the extraction of active constituents are time and solvent consuming, thermally unsafe and the analysis of numerous constituents in plant material is limited by the extraction step. This review highlights the importance of extraction step in setting up respectable standards for herbal medicine worldwide. High and fast extraction performance ability with less solvent consumption and protection offered to thermolabile constituents are some of the attractive features of this new promising microwave assisted extraction (MAE) technique. A brief theoretical background of microwave heating and the basic principles of using microwave energy for extraction have been presented for better understanding. Discussions on the main parameters influencing the extraction efficiency (namely solvent nature and volume, extraction time, microwave power, matrix characteristics and temperature) and different statistical optimization strategies are also highlighted. Finally the potential applications of this new method with comparison of its performance to that of classical techniques are also elucidated.全文下载
elfstar
第3楼2009/04/22
我这还有几篇应用类
1Microwave heating of different commercial categories of olive oil:Part I. Effect on chemical oxidative stability indices and phenolic compounds
作者 Lorenzo Cerretani a, Alessandra Bendini a,*, Maria Teresa Rodriguez-Estrada b, Elena Vittadini c,
2Microwave heating of different commercial categories of olive oil: Part II. Effecton thermal properties
作者 Emma Chiavaro a,*, Carlo Barnaba a, Elena Vittadini a, Maria Teresa Rodriguez-Estrada b,
Lorenzo Cerretani c, Alessandra Bendini c
3 Microwave-Assisted Digestion Procedures for
Biological Samples with Diluted Nitric Acid: Identification of
Reaction Products
Authors: M´ario H. Gonzalez, Gilberto B. Souza, Regina V.
Oliveira, Lucimara A. Forato, Joaquim A. N´obrega, Ana Rita
A. Nogueira
4 Application of ionic liquids in the microwave-assisted extraction of polyphenolic compounds from medicinal plants
Fu-You Du, Xiao-Hua Xiao, Xue-Jun Luo, Gong-Ke Li ∗Microwave heating of different commercial categories of olive oil:Microwave heating of different commercial categories of olive oil: Part II. EffectMicrowave-Assisted Digestion Procedures forApplication of ionic liquids in the microwave-assisted extraction of polyphenolic compounds from medicinal plants
elfstar
第4楼2009/04/22
原理类
1.Microwave heating principles and the application to the regeneration of granular activated carbon
S.M. Bradshaw, E.J. van Wyk*, and J.B. de Swardt
Synopsis
The principles of microwave heating are discussed with reference to
dielectric properties, heating phenomena and microwave
equipment. Microwave regeneration of granular activated carbon
for the carbon-in-pulp process is examined on a laboratory scale,
with special attention being given to highlight the problem areas
and specific considerations related to microwave heating. Results
indicate that microwave regeneration of carbon with 40% moisture
on a wet basis by heating to 650°C with steam addition regenerates
the carbon to virgin carbon activity levels but with a higher
abrasion resistance. A preliminary economic assessment showed
that the capital cost for 120 kg/h microwave unit would be
R540 000 with an annual operating cost of R 320/t carbon. These
figures yield a return on investment of 12%. The aim of this paper
is to provide an introduction to microwave heating and to illustrate
its application to the microwave regeneration of granular activated
carbon for the carbon-in-pulp (CIP) process.
2.Microwave heating
A.C. Metaxas
The principles of microwave heating as applied to industrial processing are outlined and the basic design of applicators for material processing is described. Industrial applications range from food tempering to rubber vulcanisation and from vacuum drying to sintering of ceramics. Established applications to date are summarised.Microwave heating principles and the application to the regeneration of granular activated carbonMicrowave heating
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