Issue 1 • Date March 2009
Inexpensive, universal serial bus-powered and fully portable lab-on-a-chip-based capillary electrophoresis instrumentPublication Year: 2009 , Page(s): 1 - 7
Capillary electrophoresis is a cornerstone of lab-on-a-chip (LOC) implementations for medical diagnostics. However, the infrastructure needed to operate electrophoretic LOC implementations tends to be large and expensive, hindering the development of portable or low-cost systems. A custom-designed and highly integrated microelectronic chip for high-voltage generation switching and interfacing is recently developed. Here, the authors integrate the microelectronic chip with a microfluidic chip, a solid-state laser, filter, lens and several dollars worth of electronic components to form an inexpensive and portable platform, which is the size of a mobile telephone. This compact system has such reduced power requirements that the complete platform can be operated using a universal serial bus link to a computer. It is believed that this system represents a significant advancement in practical LOC implementations for point-of-care medical diagnostics. View full abstract»
Biomimetic polymeric nanofibres are of great interest in tissue engineering and wound repair because of their structural similarity to extracellular matrix. In this work, biomimetic chitosan-based nanofibres with various diameters were prepared by ionically cross-linking with tripolyphosphate (TPP) in adipic acid medium and characterised using transmission electron microscopy, X-ray diffraction and Fourier-transform infrared spectroscopy. Using dexamethasone sodium phosphate (DMP) and bovine serum albumin (BSA) as low and high molecular-weight bioactive molecule models, respectively, drug loading and in vitro release behaviours of chitosan-TPP nanofibres were investigated. The drug-loaded chitosan-TPP nanofibres showed a prolonged release profile with three distinct stages in physiological conditions because of the complicated release mechanisms involving diffusion of the drug and degradation of the nanofibre, and BSA-loaded nanofibres showed a smaller release rate than DMP-loaded nanofibres. It is proposed that biomimetic chitosan-based nanofibres may be of use in tissue engineering for sustained release of bioactive agents. View full abstract»
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IET Nanobiotechnology covers all aspects of research and emerging technologies including fundamental theories and concepts applied to biomedical-related devices and methods at the micro- and nano-scale.
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