نتایج جستجو برای: ultrasound assisted emulsification microextraction silver

تعداد نتایج: 284277  

The goal of this study was to investigate the most suitable kinetic models for pectin extraction by way of ultrasound-assisted extraction (UAE) and conventional heating extraction (CHE) with acid from melon peel. The ultrasound and acidic assisted extraction were performed on powdered melon peel in three different temperatures of 40-55-70°C and 50-70-90°C, respectively. It was observed that, in...

Journal: :Talanta 2015
Elena Fernández Lorena Vidal Daniel Martín-Yerga María del Carmen Blanco Antonio Canals Agustín Costa-García

A novel approach is presented, whereby gold nanostructured screen-printed carbon electrodes (SPCnAuEs) are combined with in-situ ionic liquid formation dispersive liquid-liquid microextraction (in-situ IL-DLLME) and microvolume back-extraction for the determination of mercury in water samples. In-situ IL-DLLME is based on a simple metathesis reaction between a water-miscible IL and a salt to fo...

2012
Haifei Lu Haixi Zhang Xia Yu Shuwen Zeng Ken-Tye Yong Ho-Pui Ho

We report the synthesis of silver nanodecahedrons (NDs) for extending the localized surface plasmon resonance (LSPR) of silver nanostructures from blue to green-orange (~590 nm), which will enable much wider application opportunities using common laser light sources. In our photo-assisted method, we use a light-emitting-diode (LED) to control regrowth of silver ND from precursor seeds. Highly u...

Journal: :Physical chemistry chemical physics : PCCP 2014
Bin Tang Mingwen Zhang Ya Yao Lu Sun Jingliang Li Shuping Xu Wu Chen Weiqing Xu Xungai Wang

Silver nanoprisms were transformed into nanodecahedra through photoinduction of ultraviolet (UV) light in the presence of titanium dioxide (TiO2) quantum dots (QDs). Subsequently, the silver nanodecahedra were reconverted to silver nanoprisms under sodium lamp if there was sufficient citrate in the reaction system. The localized surface plasmon resonance (LSPR) optical properties of silver nano...

Journal: :Talanta 2014
Carol Cortada Luciana Costa dos Reis Lorena Vidal Julio Llorca Antonio Canals

A fast, simple and environmentally friendly ultrasound-assisted dispersive liquid-liquid microextraction (USA-DLLME) procedure has been developed to preconcentrate eight cyclic and linear siloxanes from wastewater samples prior to quantification by gas chromatography-mass spectrometry (GC-MS). A two-stage multivariate optimization approach has been developed employing a Plackett-Burman design f...

Journal: :Journal of separation science 2012
Songqing Li Peng Gao Jiaheng Zhang Yubo Li Bing Peng Haixiang Gao Wenfeng Zhou

A novel dispersive liquid-liquid microextraction (DLLME) method followed by HPLC analysis, termed sequential DLLME, was developed for the preconcentration and determination of aryloxyphenoxy-propionate herbicides (i.e. haloxyfop-R-methyl, cyhalofop-butyl, fenoxaprop-P-ethyl, and fluazifop-P-butyl) in aqueous samples. The method is based on the combination of ultrasound-assisted DLLME with in si...

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