نتایج جستجو برای: solvent free microwave extraction

تعداد نتایج: 758549  

Journal: :Analytical and bioanalytical chemistry 2005
Oriza Tavares Simone Morais Paula Paíga Cristina Delerue-Matos

An extraction-anodic adsorptive stripping voltammetric procedure using microwave-assisted solvent extraction and a gold ultramicroelectrode was developed for determining the pesticide ametryn in soil samples. The method is based on the use of acetonitrile as extraction solvent and on controlled adsorptive accumulation of the herbicide at the potential of 0.50 V (vs. Ag/AgCl) in the presence of ...

Journal: :Molecules 2006
Souad Kasmi-Mir Ayada Djafri Ludovic Paquin Jack Hamelin Mustapha Rahmouni

A rapid and easy solvent free one-pot synthesis of 5-arylidene-2-imino-4-thiazolidinones by condensation of the thioureas with chloroacetic acid and an aldehyde under microwave-irradiation is described.

Journal: :Molecules 2010
Ruoqun Ma Jin Zhu Jie Liu Lili Chen Xu Shen Hualiang Jiang Jian Li

An efficient one-pot method to generate structurally diverse and medicinally interesting pyrazolone derivatives in good to excellent yields of 51-98% under microwave irradiation and solvent-free conditions has been developed.

A Mohammadi, F Barzegar, M Kamankesh, N Omidi,

Background and Objectives: Heterocyclic aromatic amines (HAAs) are carcinogenic and mutagenic substances, which are formed during the heating process of proteinaceous foods such as meat and meat products. The extraction of these compounds from the complex matrix of meat products was carried out by microwave assisted pre-extraction and a precise, rapid and high sensitive microextraction method. ...

Journal: :Journal of chromatography. A 2008
Jun-Xia Wang Xiao-Hua Xiao Gong-Ke Li

Vacuum microwave-assisted extraction (VMAE), in which microwave-assisted extraction (MAE) was performed in vacuum, was specially designed and applied for the extraction of polyphenolic compounds and pigments from Chinese herbs. The extraction conditions including solid/liquid ratio, extraction time, extraction temperature and degree of vacuum were optimized. Subsequently, VMAE, MAE, and convent...

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