scholarly journals Love Wave Sensors with Silver Modified Polypyrrole Nanoparticles for VOCs Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1432 ◽  
Author(s):  
Milena Šetka ◽  
Fabio A. Bahos ◽  
Daniel Matatagui ◽  
Isabel Gràcia ◽  
Eduard Figueras ◽  
...  
Keyword(s):  
Quality Control ◽  
Love Wave ◽  
Active Sites ◽  
Disease Diagnosis ◽  
Exhaled Breath ◽  
Limits Of Detection ◽  
Sensor Structure ◽  
Control Food ◽  
Polypyrrole Nanoparticles ◽  
Wave Sensors

Love wave sensors with silver-modified polypyrrole nanoparticles are developed in this work. These systems prove functional at room temperature with enhanced response, sensitivity and response time, as compared to other state-of-the-art surface acoustic wave (SAW) sensors, towards volatile organic compounds (VOCs). Results demonstrate the monitoring of hundreds of ppb of compounds such as acetone, ethanol and toluene with low estimated limits of detection (~3 ppb for acetone). These results are attributed to the use of silver-modified polypyrrole as a second guiding/sensitive layer in the Love wave sensor structure, which provides further chemically active sites for the gas-solid interactions. The sensing of low VOCs concentrations by micro sensing elements as those presented here could be beneficial in future systems for air quality control, food quality control or disease diagnosis via exhaled breath as the limits of detection obtained are within those required in these applications.

scholarly journals A European Respiratory Society technical standard: exhaled biomarkers in lung disease

2017 ◽  
Vol 49 (4) ◽  
pp. 1600965 ◽  
Author(s):  
Ildiko Horváth ◽  
Peter J. Barnes ◽  
Stelios Loukides ◽  
Peter J. Sterk ◽  
Marieann Högman ◽  
...  
Keyword(s):  
Task Force ◽  
Exhaled Breath Condensate ◽  
Research Priorities ◽  
Disease Diagnosis ◽  
Future Research ◽  
Exhaled Breath ◽  
Sample Collection ◽  
European Respiratory Society ◽  
Technical Standards ◽  
Breath Tests

Breath tests cover the fraction of nitric oxide in expired gas (FENO), volatile organic compounds (VOCs), variables in exhaled breath condensate (EBC) and other measurements. For EBC and for FENO, official recommendations for standardised procedures are more than 10 years old and there is none for exhaled VOCs and particles. The aim of this document is to provide technical standards and recommendations for sample collection and analytic approaches and to highlight future research priorities in the field. For EBC and FENO, new developments and advances in technology have been evaluated in the current document. This report is not intended to provide clinical guidance on disease diagnosis and management.Clinicians and researchers with expertise in exhaled biomarkers were invited to participate. Published studies regarding methodology of breath tests were selected, discussed and evaluated in a consensus-based manner by the Task Force members.Recommendations for standardisation of sampling, analysing and reporting of data and suggestions for research to cover gaps in the evidence have been created and summarised.Application of breath biomarker measurement in a standardised manner will provide comparable results, thereby facilitating the potential use of these biomarkers in clinical practice.

scholarly journals Paracetamol: A Report of a Regional Quality Control Scheme

1979 ◽  
Vol 16 (1-6) ◽  
pp. 265-270 ◽  
Author(s):  
J. Epton
Keyword(s):  
Quality Control ◽  
Group Performance ◽  
Clinical Importance ◽  
External Quality Control ◽  
External Quality ◽  
Limits Of Detection ◽  
Trouble Shooting ◽  
Control Scheme ◽  
Considerable Impact ◽  
Quality Control Scheme

The results from an external quality control scheme for the assay of paracetamol in serum are reported. A preferential method of assay has not become evident, but, as a result of the scheme, some laboratories have changed or modified their techniques or have re-established the limits of detection. The majority of laboratories were able to estimate paracetamol satisfactorily at those levels which are of clinical importance. The overall group performance has shown little change. The programme has had considerable impact in so far as it has led to a mutually useful interchange of information and trouble shooting.

scholarly journals Detection of isoprene traces in exhaled breath by using photonic crystals as a biomarker for chronic liver fibrosis disease

2021 ◽  
Author(s):  
Ahmed Mehaney ◽  
Hussein A. Elsayed ◽  
Ashour M. Ahmed
Keyword(s):  
Liver Fibrosis ◽  
Photonic Crystals ◽  
High Sensitivity ◽  
Dielectric Materials ◽  
Exhaled Breath ◽  
Air Cavity ◽  
One Dimensional ◽  
Sensor Structure ◽  
Volatile Organic ◽  
First Time

Abstract Detection of blood-carried volatile organic compounds (VOCs) existing in the exhaled breath of human is an attractive research point for noninvasive diagnosis of diseases. In this research, we introduce a novel application of photonic crystals (PCs) for the detection of isoprene traces in the exhaled breath as a biomarker for liver fibrosis. This idea is introduced for the first time according to the best of our knowledge. The proposed sensor structure is a one-dimensional (1D) PC constructed from a multilayer stack of two dielectric materials covered with an air cavity layer filled with the dry exhaled breath (DEB) and a thin metallic layer of Au is attached on the top surface. Hence, the proposed sensor is configured as, [prism/Au/air cavity/(GaN/SiO2)10]. The transfer matrix method and the Drude model are adopted to calculate the numerical simulations and reflection spectra of the design. The essential key for sensing isoprene levels is the resonant optical Tamm plasmon (TP) states within the photonic bandgap. The obtained numerical results are promising such as high sensitivity (S) of 0.321 nm/ppm or 278720 nm/RIU. This technique can be reducing the risk of infection during the taking of blood samples by syringe. Also, it can prevent the pain of patients. Finally, this work opens the door for the detection of many diseases by analyzing the breaths of patients based on photonic crystals.

scholarly journals Love wave sensors based on gold nanoparticle-modified polypyrrole and their properties to ammonia and ethylene

2020 ◽  
Vol 304 ◽  
pp. 127337 ◽  
Author(s):  
M. Šetka ◽  
F.A. Bahos ◽  
D. Matatagui ◽  
M. Potoček ◽  
Z. Kral ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Love Wave ◽  
Wave Sensors

Design and fabrication of Love-wave sensors: An experimental study

2011 ◽  
Author(s):  
D. Matatagui ◽  
J. Fontecha ◽  
M. J. Fernandez ◽  
M. C. Horrillo ◽  
I. Gracia ◽  
...  
Keyword(s):  
Experimental Study ◽  
Love Wave ◽  
Wave Sensors

scholarly journals Monitoring bio-molecular vesicle interactions in liquid using Love-wave sensors

2009 ◽  
Vol 1 (1) ◽  
pp. 1075-1078
Author(s):  
V. Blondeau-Patissier ◽  
C. Elie-Caille ◽  
L. El Fissi ◽  
J.M. Friedt ◽  
S. Ballandras
Keyword(s):  
Love Wave ◽  
Wave Sensors
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