Articles Related to Volatile organic compounds
Exhaled Volatile Organic Compounds in Patients with Colonic Polyps
Background: Exhaled Volatile Organic Compounds (E-VOCs) may help to early detection of colonic polyps
Objective: Assess whether a new ambulatory device is able to detect specific E-VOCs in patients recently diagnosed with colonic polyps.
Material and Methods: All data were collected during routine consultations for Small Intestinal Bowel Overgrowth. A breath test was performed by X-PID 9500®.
Results: 203 patients older than 45 years of age were included. 31patients (15.3%) reported colonic polyps. 74 patients presented with gastroduodenal or jejunal (GDJ) liquid at ultrasound examination despite fasting.
96 patients (47.3%) exhaled numerous E-VOCs with a retention time between 12 to 45s (E-VOCs 12 to 45s). All patients of the polyp group exhaled E-VOCs 12 to 45s.
69 patients with GDJ liquid exhaled E-VOCS 12 to 45s. 11 patients out of these 69 cases (15.9%) present with polyps. 27 patients exhaled E-VOCs 12 to 45s and did not have GDJ, 20 of whom (74.1%) presented with polyps.
When GDJ liquid is not objectivized after fasting, the sensitivity of the E-VOCs 12 to 45s to identify patients with colonic polyps is equal to 100.0% and the specificity is 93.6%. The positive predictive value is 74.1% and the negative predictive value is 100%.
Conclusion: After fasting, X-PID 9500® is able to detect E-VOCs associated with colonic polyps, when GDJ liquid is excluded.
Assessment of Particulate Matter, Volatile Organic Compounds, and Suspended Solids in Some Settlements around Port Harcourt Metropolis, Rivers State Nigeria
There is a proliferation of particulate matter in the atmosphere within and around the cities because of increased industrial activities. It is thus hypothesized that increase in human activities lead to increase in pollutants concentration inside (n=80 houses sampled) and outside residential areas. Thus, to investigate the air quality at different residential areas within indoor and outdoor environment air samples were collected using Particle Counter (Model: HHPC MET), and Gas Monitor (Aeroqual series 500) to determine particulate matters (i.e., PM10, and PM2,5), volatile organic carbon (VOC) and total solid particle (TSP).
Exhaled Volatile Organic Compounds and Vagal Tone are Different in Patients with Overweight or with Obesity: Practical Consequencies
Urinary Volatile Organic Compounds have been associated with type 2 diabetes mellitus and overweight and may
correlate with Exhaled Volatile Organic Compounds (E-VOCs).
Exhaled Volatile Organic Compounds in Patients with a Medical History of Cancer/Dysplasia
Exhaled Volatile Organic Compounds (E-VOCs) have been associated with cancer and may help to early detection or
even identify pre-cancerous status.
Electronic-nose Applications in Forensic Science and for Analysis of Volatile Biomarkers in the Human Breath
The application of electronic-nose (E-nose) technologies in forensic science is a recent new development following a long history of progress in the development of diverse applications in the related biomedical and pharmaceutical fields. Data from forensic analyses must satisfy the needs and requirements of both the scientific and legal communities. The type of data collected from electronic-nose devices provides a means of identifying specific types of information about the chemical nature of evidentiary objects and samples under investigation using aroma signature profiles of complex gaseous mixtures containing volatile organic compounds (VOCs) released from manufactured products and parts of the human body. E-nose analyses also provide useful qualitative information about the physicochemical characteristics and metabolic conditions of human subjects without the need for time-consuming analyses to identify all chemical components in human-derived volatile mixtures.
Analysis of Sweat Simulant Mixtures using Multiplexed Arrays of DNA-Carbon Nanotube Vapor Sensors
Carbon nanotube (NT) based electronic vapor sensors were tested against synthetic sweat solutions, consisting of 13 volatile organic
compounds (VOCs) in saline, in order to probe the device ability to analyze and differentiate vapors derived from complex biological
samples.
Characteristic Human Scent Compounds Trapped on Natural and Synthetic Fabrics as analyzed by SPME-GC/MS
The collection of human odor volatiles is of interest to forensic applications as a path to investigate canine scent discriminations in
legal investigations. A study using a selected array of previously identified human odor compounds has been conducted to determine
the retention and release capabilities of five (5) natural and synthetic fabric types, cotton (mercerized fabric and gauze matrix),
polyester, rayon and wool.