Topics

Volatiles in Breath and Headspace Analysis - Diagnostic Markers

2017-07-25 12:38:21 | BioPortfolio

Summary

Detection of Volatile Organic Compounds (VOC) directly from tissue by headspace analysis (skin, surgery material, other tissue) and exhaled breath is feasible using affordable user-friendly novel nano-chemo sensors that can accurately be used for screening and monitoring purpose

Description

Study propose to explore a novel approach for the diagnosis and monitoring of diseases. The approach is based on the detection of volatile organic compounds (VOCs) that are emitted from the cells and detected directly from tissue, such as skin, surgery material, blood as well asfrom exhaled breath.

In the literature there are several reports on VOCs which can be detected by Gas Chromatography - Mass Spectrometry (GC-MS) means directly from: (i) the headspace of TB cells (i.e., the mixture of volatile biomarkers trapped above the TB cells in a sealed vessel); (ii) the exhaled breath or (iii) from urine. Excellent results in detection of the tuberculosis disease by using nanosensor array were shown by Nakhleh et al achieved 90% sensitivity, 93% specificity and 92% accuracy in discrimination between healthy and diseased patients using electronic nose devices with a single sensor. None of the reported studies identified the tentative recognition of the tuberculosis-related VOCs and quantified the concentration differences between samples from ill and healthy controls. Further investigation of the exhaled breath tuberculosis-related VOC by GC-MS means will improve the knowledge and simultaneously will help to improve the nanosensor array design.

Several studies have shown that disease-rated VOC patterns can be transmitted through the skin, and, therefore, skin can be used as a source for disease detection and identification. The principle of this detection approach is that disease-related changes are reflected in measurable changes in the skin through exchange via the blood. In addition, several studies have suggested that the VOC levels are elevated even in early stages of the disease, because they reflect a change in the human's body chemistry (as a result of the development of disease condition), rather than the amount of infected cells. Complementary studies have shown that VOCs can be emitted to the skin within minutes after they have emerged in the infected part of the human's body. What is particularly significant about this approach is that each type of (infectious) disease has its own unique pattern of VOCs, and, therefore, the presence of one (infectious) disease would not screen other disease types. Nevertheless, to the best of our knowledge, the detection of tuberculosis VOCs through skin has not been examined yet. Additionally, all studies targeting skin VOCs have been carried out by means of spectrometry and spectroscopy techniques. In few cases, electronic nose devices were used. These techniques are powerful tools for detecting VOCs. However, to date, the use of these techniques has been impeded by the need for moderately to highly expensive equipment's, the high levels of expertise required to operate such instruments, the speed required for sampling and analysis, and the need for preconcentration techniques. For VOC skin testing and breath testing of tuberculosis to become widely used in clinical practice, several advances in the knowledge of tuberculosis specific VOCs and sensor development need to occur. Nanoparticles containing flexible sensors, based on organic films, are more likely to become a clinical diagnostic tool, because they are significantly smaller, easier-to-use, and significantly less expensive.

In recent years comprehensive studies have shown excellent data for using VOCs from exhaled breath as tool for diagnosing gastric cancer. In one of the biggest studies carried out by Chinese and Latvian centers, malignancy could be identified with 89% sensitivity and 90% specificity after cross-validation, irrespective of important confounding factors in gastric patients such as tobacco or alcohol consumption and H. pylori infection. A breath test for GC staging could also be demonstrated by distinguishing stage I&II cancers from stage III&IV cancers with 89% sensitivity and 94% specificity. These studies used both - mass spectometry and nano-sensors technologies. Most recent study published in ASC Nano journal in January 2017 reported on more extended use of nannoarry sensors in breath analysis, blind experiments showed that 86% accuracy could be achieved with the artificially intelligent nanoarray, allowing both detection and discrimination between the different disease conditions examined (chronic kidney failure, idiopathic Parkinson's disease, atypical Parkinsonism , multiple sclerosis, Crohn's disease, ulcerative colitis, irritable bowel syndrome, pulmonary arterial hypertension, pre-eclampsia in pregnant women, head and neck cancer, lung cancer, colorectal cancer, bladder cancer, kidney cancer, prostate cancer, gastric cancer, and ovarian cancer. Analysis of the artificially intelligent nanoarray also showed that each disease has its own unique breathprint, and that the presence of one disease would not screen out others.

Therefore, this study is aimed to test VOCs detecting tehnologies as diagnostic and monitoring tools for digestive tract and infectious diseases.

Study Design

Conditions

Tuberculosis

Intervention

VOC detection in breath and in skin headspace, Breath sampling, Upper endoscopy with biopsies, Colonoscopy with biopsies, Whole blood/ Plasma / serum sampling, Feacal sampling, Histological examination of surgical speciment, Headspace analysis for biologi

Location

University of Latvia
Riga
Latvia
LV 1586

Status

Not yet recruiting

Source

University of Latvia

Results (where available)

View Results

Links

Published on BioPortfolio: 2017-07-25T12:38:21-0400

Clinical Trials [3305 Associated Clinical Trials listed on BioPortfolio]

Screening of Gastric Cancer Via Breath Volatile Organic Compounds by Hybrid Sensing Approach

The study is aimed to determine the potential of volatile marker testing for gastric cancer screening. The study will be addressing the role of confounding factors, including lifestyle fa...

Bag Mode BreathID Hp Validation Versus Endoscopy in Detection of Helicobacter Pylori

A new method of breath collection for testing for Helicobacter Pylori infection has been developed by Exalenz. In this study, it will be compared to the gold standard- endoscopy results to...

Breath Test for Chemicals (Volatile Organic Compounds)

Background: - Some types of cancer, like cancer of the esophagus, are difficult to detect at an early stage. A possible detection method involves collecting breath samples to look for che...

Using Breath Metabolites to Determine Specific Virus Infection in Asthmatic Patients

Respiratory virus infections cause a majority of asthma exacerbations in the fall to spring months. Current diagnostic platforms for respiratory viruses have limitations including cost, av...

Evaluation of C13 Breath Test for Upper Gastrointestinal Bleeding in Patients Who Need Double Antiplatelet After PCI

Hp infection is closely related to upper gastrointestinal bleeding in patients who need dual-antiplatelet after PCI. Taking anti-Hp treatment has the effect of reducing bleeding risk. Thus...

PubMed Articles [12643 Associated PubMed Articles listed on BioPortfolio]

Recent advances in breath analysis to track human health by new enrichment technologies.

Detection of biomarkers in exhaled breath has been gaining increasing attention as a tool for diagnosis of specific diseases. However, rapid and accurate quantification of biomarkers associated with s...

Impact of oral cleansing strategies on exhaled volatile organic compound levels.

The analysis of volatile organic compounds (VOCs) within exhaled breath potentially offers a non-invasive method for the detection and surveillance of human disease. Oral contamination of exhaled brea...

The COSMED K5 in Breath-by-Breath and Mixing Chamber Mode at Low to High Intensities.

The portable metabolic analyzer COSMED K5 (Rome, Italy) allows to switch between breath-by-breath (BBB) and dynamic mixing chamber (DMC) mode. This study aimed to evaluate the reliability and validity...

Topical review on monitoring tetrahydrocannabinol in breath.

Legalization of cannabis for recreational use has compelled governments to seek new tools to accurately monitor Δ9-tetrahydrocannabinol (Δ9-THC) and understand its effect on impairment. Various meth...

Characterization of standardized breath sampling for off-line field use.

Due to several sources of potential variability associated with exhaled breath bag sampling procedures for off-line analysis, the Respiration Collector for In Vitro Analysis (ReCIVA) sampler was devel...

Medical and Biotech [MESH] Definitions

The vital life force in the body, supposedly able to be regulated by acupuncture. It corresponds roughly to the Greek pneuma, the Latin spiritus, and the ancient Indian prana. The concept of life-breath or vital energy was formulated as an indication of the awareness of man, originally directed externally toward nature or society but later turned inward to the self or life within. (From Comparison between Concepts of Life-Breath in East and West, 15th International Symposium on the Comparative History of Medicine - East and West, August 26-September 3, 1990, Shizuoka, Japan, pp. ix-x)

An involuntary or voluntary pause in breathing, sometimes accompanied by loss of consciousness.

BREATH HOLDING; VASOCONSTRICTION; and a drop in HEART RATE in response to submersion of the face in cold water.

A respiratory infection caused by BORDETELLA PERTUSSIS and characterized by paroxysmal coughing ending in a prolonged crowing intake of breath.

Any tests done on exhaled air.

More From BioPortfolio on "Volatiles in Breath and Headspace Analysis - Diagnostic Markers"

Quick Search

Relevant Topics

Wound management
Anything that breaks the skin is a wound because when the skin is broken, there's a risk of germs getting into the body and causing an infection. Follow and track Wound Care News on BioPortfolio: Wound Car...

Surgical treatments
Surgery is a technology consisting of a physical intervention on tissues. All forms of surgery are considered invasive procedures; so-called "noninvasive surgery" usually refers to an excision that does not penetrate the structure being exci...

Respiratory
Asthma COPD Cystic Fibrosis Pneumonia Pulmonary Medicine Respiratory Respiratory tract infections (RTIs) are any infection of the sinuses, throat, airways or lungs.  They're usually caused by viruses, but they can also ...


Searches Linking to this Trial