Early wound infection monitoring via headspace O micro-respirometry.

A luminescence based, inexpensive, 3D printed O indicator is incorporated into a commercial, clear, occlusive wound dressing, which allows the %O in the headspace above a simulated wound to be monitored. Two wound models are used to evaluate this micro-respirometry-based system for monitoring wound infection namely, a simple 'agar plug' model and a wounded porcine skin model. Inoculation of either wound model with E.

Colorimetric CO Indicators.

Carbon dioxide, CO, is an essential part of life, in that through green plant photosynthesis it is used to generate food and fuel and is generated in both aerobic and anaerobic respiration. Industrially, it is used in fire extinguishers, supercritical fluid extractions, and food packaging. Environmentally, it is in the atmosphere, hydrosphere, and biosphere and is responsible for global warming and the acidification of the oceans.

Non-invasive, 3D printed, colourimetric, early wound-infection indicator.

A simple, non-invasive, colour-based carbon dioxide (CO) indicator is described. The indicator provides an indirect response to the rapid, aerobic microbial colonisation of an underlying wound when used in conjunction with an occlusive ( sealed) dressing. The indicator has potential as an early warning indicator of infection in chronic wounds.

3D printed O indicators.

A polymer filament, containing an O2-sensitive lumophore pigment, platinum(ii) (pentafluorophenyl) porphyrin coated onto nanoparticulate silica particles, i.e. PtTFPP/SiO2, is produced and used in a filament which is then 3D printed as O2-sensitive indicator dots (1 cm diameter, 30 μm thick) on a polyethylene terephthalate (PET) supporting film substrate.

A colourimetric vacuum air-pressure indicator.

A colourimetric vacuum air pressure indicator is described, based on the very low level of CO in air. The indicator uses the pH indicator dye, ortho-cresolphthalein, OCP, which is violet coloured in its deprotonated form and colourless when protonated. When the violet coloured OCP anion is ion-paired with the tetrabutylammonium cation, the product is readily dissolved in a non-aqueous solution containing the polymer ethyl cellulose to create an ink which, when cast and allowed to dry, responds to levels of CO well below that in air, i.

Colourimetric plastic film indicator for the detection of the volatile basic nitrogen compounds associated with fish spoilage.

The first example of an extruded polymer film containing the pH sensitive dye bromophenol blue (BPB) is described in which the polymer encapsulated dye changes colour from yellow to blue upon exposure to basic volatile nitrogen compounds, such as those given off by fish as it spoils. The latter include: trimethylamine (TMA), dimethylamine (DMA) and ammonia (NH), and are collectively known as total volatile basic nitrogen (TVB-N). The films' colourimetric response to specific levels of TMA, as measured using absorbance spectroscopy and digital photography coupled with RGB colour analysis, is reported.

Highly CO2 sensitive extruded fluorescent plastic indicator film based on HPTS.

Highly-sensitive optical fluorescent extruded plastic films are reported for the detection of gaseous and dissolved CO2. The pH-sensitive fluorescent dye used is 8-hydroxypyrene-1,3,6-trisulfonic acid trisodium salt (HPTS, PTS(-)) coated on the surface of hydrophilic fumed silica and the base is tetrabutylammonium hydroxide (TBAH). The above components are used to create an HPTS pigment (i.