Simple and sensitive electrochemical sensing of amethopterin by using carbon nanobowl/cyclodextrin electrode.

Resulted from the severe side effects, the development of inexpensive, simple and sensitive method for amethopterin (ATP, an antineoplastic drug) is very important but it still remains a challenge. In this work, low cost nanohybrid composed of carbon nanobowl (CNB) and β-cyclodextrins (β-CD) (CNB-CD) was prepared with a simple autopolymerization way and applied as electrode material to develop a novel electrochemical sensor of ATP. Scanning-/transmission-electron microscopy, Fourier transform infrared spectrum, photographic image and electrochemical technologies were utilized to characterize morphologies and structure of the as-prepared CNB and CNB-CD materials.

Electrochemiluminescent immunoassay for the lung cancer biomarker CYFRA21-1 using MoO quantum dots.

Molybdenum oxide quantum dots (MoO QDs) were synthesized by a one-pot method and used as a versatile probe in an electrochemiluminescent (ECL) immunoassay of the non-small cell lung cancer biomarker cytokeratin 19 fragment 21-1 (CYFRA21-1) as a model analyte. The MoO QDs exhibited stable and strong cathodic green ECL, with an emission peak at 535 nm, in the presence of KSO within the potential range of -2.0 to 0 V.

Poly[dibromidobis[μ-1-(pyridin-4-ylmeth-yl)-1H-1,2,4-triazole-κN:N']cadmium].

The title coordination polymer, [CdBr(2)(C(8)H(8)N(4))(2)](n), arose from a layer-separated diffusion synthesis at room temperature. The title compound is isotypic with the I and Cl analogues. The Cd atom, located on an inversion center, is coordinated by two bromide ions and four N atoms (two from triazole rings and two from pyridyl rings) in a distorted trans-CdBr(2)N(4) octa-hedral arrangement.

Poly[dichloridobis[μ-1-(4-pyridyl-meth-yl)-1,2,4-triazole]cadmium(II)].

In the title coordination polymer, [CdCl(2)(C(8)H(8)N(4))(2)](n), the Cd(II) atom, lying on an inversion center, is coordinated by two Cl atoms and two triazole N atoms and two pyridyl N atoms from four 1-(4-pyridyl-meth-yl)-1,2,4-triazole (pmta) ligands in a distorted trans-CdCl(2)N(4) octa-hedral arrangement. The bridg-ing pmta ligands, with a dihedral angle between the triazole and pyridyl rings of 71.86 (8)°, link the Cd atoms into a 4(4) sheet parallel to (02).

A two-dimensional manganese(II) complex: poly[bis-(μ(2)-4,4'-bipyrid-yl)tetra-kis-(μ(2)-3,5-dinitro-benzoato)dimanganese(II)].

The Mn atom in the title compound, [Mn(2)(C(7)H(3)N(2)O(6))(4)(C(10)H(8)N(2))(2)](n), is six-coordinated by two N atoms and four O atoms, forming a distorted octa-hedral geometry. The Mn-O bond lengths are in the range 2.1281 (13)-2.

Poly[dichloridobis[μ-1-(4-pyridylmeth-yl)-1H-1,2,4-triazole]copper(II)].

The title coordination polymer, [CuCl(2)(C(8)H(8)N(4))(2)](n), arose from a layer-separated diffusion synthesis at room temperature. The Cu atom (site symmetry ) is coordinated by two chloride ions and four N atoms (two from triazole rings and two from pyridyl rings) in a distorted trans-CuCl(2)N(4) octa-hedral arrangement. The bridging 1-(4-pyridylmeth-yl)-1H-1,2,4-triazole ligands [dihedral angle between the triazole and pyridine rings = 68.

Novel biodegradable blend matrices for controlled drug release.

Phosphorylcholine-functionalized poly-epsilon-caprolactone (PC-PCL) is a new biodegradable polymer with good biocompatibility. In this study modulation of the controlled release of Ibuprofen (IB), a model drug, from poly-epsilon-caprolactone (PCL) by direct blending with PC-PCL is investigated. The influence of several factors such as the content of PC-PCL in the blend, drug loading and the molecular weight of PCL matrix upon the IB release is recognized.

Structure and release behavior of PMMA/silica composite drug delivery system.

The preparation, characterization, and in vitro release of aspirin from polymethylmethacrylate (PMMA)/silica composites prepared via a sol-gel route are reported. The in vitro drug release test revealed that the release rate of aspirin in PBS increased with the silica content in the composites; on the contrary, the increase of the content of 3-(trimethoxysilyl) propyl methacrylate (MSMA), a coupling agent, decreased the drug release rate. The drug release rate/composite structure relationship was studied using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and swelling ratio (SR) measurement.