In vivo measurement of oxygen concentration using sonochemically synthesized microspheres

In vivo measurement of oxygen concentration using sonochemically synthesized microspheres.

Proteinaceous microspheres filled with nitroxides dissolved in an organic liquid have been synthesized for the first time using high intensity ultrasound; these were used to measure oxygen concentrations in living biological systems. The microspheres have an average size of 2.5 microns, and the proteinaceous shell is permeable to oxygen. Encapsulation of the nitroxides into the microsphere grea...

Characterization of sonochemically prepared proteinaceous microspheres

Aqueous suspensions of albumin and haemoglobin microspheres can be synthesized using high-intensity ultrasound. The particle size distributions are Gaussian with mean diameters of a few micrometers. These microspheres can contain either nonaqueous liquids (i.e. microcapsules) or air (i.e. microbubbles). The chemical processes involved in the synthesis and some physical properties of the microsp...

Optical measurement of oxygen concentration in water

Measurement of oxygen concentration using laser diode spectroscopy

Laser Spectroscopy provides a non-intrusive method for measuring the concentration of a species in a sample. This paper is a part of the development of employing laser spectroscopy techniques outside of a lab setting. Monitoring the presence of gaseous oxygen within a fuel tank is of great importance due to the volatility of the fuel/oxygen mixture and the threat it creates to the area surround...

Simultaneous measurement of dissolved oxygen concentration and velocity field in microfluidics using oxygen-sensitive particles

This paper reports a technique for measuring the velocity and dissolved oxygen concentration (DOC) fields simultaneously in a micro-scale water flow using oxygensensitive particles (OSP) and a conventional microparticle image velocimetry method. The OSP were fabricated using a dispersion polymerization method by synthesizing platinum (II) octaethyporphyrin (PtOEP) with polystyrene, and used as ...