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529 Newest Publications in microchimica acta

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Detection of Helicobacter pylori with a nanobiosensor based on fluorescence resonance energy transfer using CdTe quantum dots

26-Nov-2012 | Maryam Shanehsaz, Afshin Mohsenifar, Sadegh Hasannia, Nazanin Pirooznia, Yasaman Samaei, Mojtaba Shamsipur, Microchimica Acta, 2012

We report on a method for the sensitive determination of Helicobacter that is based on fluorescence resonance energy transfer using two oligonucleotide probes labeled with CdTe quantum dots (QDs) and 5-carboxytetramethylrhodamine (Tamra) respectively. QDs labeled with an amino-modified first ...

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Highly sensitive electrochemical immunoassay for zearalenone in grain and grain-based food

26-Nov-2012 | Yuan-Kai Wang, Ya-Xian Yan, Zi-Wei Mao, Heng-an Wang, Qi Zou, Qian-Wen Hao, Wen-Hui Ji, Jian-He Sun, Microchimica Acta, 2012

We have developed a highly sensitive electrochemical immunoassay for the quantitation of zearalenone (ZEN), a mycotoxin produced by Fusarium species. In this enzyme linked immunosorbent assay, the enzymatic conversion of the substrate p-nitrophenylphosphate is detected by a microplate reader and ...

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Detection of Sn(II) ions via quenching of the fluorescence of carbon nanodots

19-Nov-2012 | Siti Nur Akmar Mohd Yazid, Suk Fun Chin, Suh Cem Pang, Sing Muk Ng, Microchimica Acta, 2012

We report that fluorescent carbon nanodots (C-dots) can act as an optical probe for quantifying Sn(II) ions in aqueous solution. C-dots are synthesized by carbonization and surface oxidation of preformed sago starch nanoparticles. Their fluorescence is significantly quenched by Sn(II) ions, and ...

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Preparation of liposomes loaded with quantum dots, fluorescence resonance energy transfer studies, and near-infrared in-vivo imaging of mouse tissue

15-Nov-2012 | Chao Ye, Yunqing Wang, Chengui Li, Jie Yu, Yuzhu Hu, Microchimica Acta, 2012

We report on a simple, fast and convenient method to engineer lipid vesicles loaded with quantum dots (QDs) by incorporating QDs into a vesicle-type of lipid bilayer using a phase transfer reagent. Hydrophilic CdTe QDs and near-infrared (NIR) QDs of type CdHgTe were incorporated into liposomes by ...

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Direct electrodeposition of a biocomposite consisting of reduced graphene oxide, chitosan and glucose oxidase on a glassy carbon electrode for direct sensing of glucose

15-Nov-2012 | Shanli Yang, Zhenzhen Lu, Shenglian Luo, Chengbin Liu, Yanhong Tang, Microchimica Acta, 2012

We have electrodeposited a composite film consisting of graphene oxide, chitosan and glucose oxidase directly on a glassy carbon electrode (GCE) through electrochemical reduction of a solution of the 3 components under controlled direct electrical potential. The procedure takes only several ...

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Electrochemical aptasensor for the determination of bisphenol A in drinking water

15-Nov-2012 | Feng Xue, Jingjing Wu, Huaqin Chu, Zhanlong Mei, Yongkang Ye, Jian Liu, Rui Zhang, Chifang Peng, Lei Zheng, Wei Chen, Microchimica Acta, 2012

We present an electrochemical aptasensor for rapid and ultrasensitive determination of the additive bisphenol A (BPA) and for screening drinking water for the presence of BPA. A specific aptamer against BPA and its complementary DNA probe were immobilized on the surface of a gold electrode via ...

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Chronocoulometric DNA biosensor based on a glassy carbon electrode modified with gold nanoparticles, poly(dopamine) and carbon nanotubes

14-Nov-2012 | Xiao Dong, Xiaocui Lu, Keying Zhang, Yuzhong Zhang, Microchimica Acta, 2012

We describe a sensitive chronocoulometric biosensor for the sequence-specific detection of DNA. It is based on a glassy carbon electrode modified with multi-walled carbon nanotubes, polydopamine, and gold nanoparticles. The ruthenium(III)hexammine complex acts as the electrochemical indicator. ...

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Centri-voltammetric determination of glutathione

14-Nov-2012 | Meliha Çubukçu, Fatma Nil Ertaş, Ülkü Anık, Microchimica Acta, 2012

Centri-voltammetry is a method for concentrating an analyte on an electrode with the aid of a centrifuge. It can be performed in the presence or the absence of a solid carrier/support. This is followed by a voltammetric (analytical) scan. Specifically, we describe here an application of the ...

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Colloidal silica beads modified with quantum dots and zinc (II) tetraphenylporphyrin for colorimetric sensing of ammonia

13-Nov-2012 | Hua Xu, Maochun Zhang, Haibo Ding, Zhuoying Xie, Microchimica Acta, 2012

Colloidal crystal beads (CCBs) were fabricated by assembling monodisperse silica nanoparticles via a microfluidic device. The pore size of the CCBs was tuned by using different nanoparticles. The CCBs were then coated with cadmium telluride quantum dots and zinc(II) meso-tetraphenylporphyrin for ...

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Determination of microcystin-LR with a glassy carbon impedimetric immunoelectrode modified with an ionic liquid and multiwalled carbon nanotubes

13-Nov-2012 | Xiulan Sun, Lu Guan, Hui Shi, Jian Ji, Yinzhi Zhang, Zaijun Li, Microchimica Acta, 2012

We report on a sensitive, simple, label-free impedance-based immunoelectrode for the determination of microcystin-LR (MCLR). The surface of the electrode was modified with a composite made from multiwalled carbon nanotubes and an ionic liquid, and with immobilized polyclonal antibody against ...

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