Confined direct analysis in real time ion source and its applications in analysis of volatile organic compounds of Citrus limon (lemon) and Allium cepa (onion)

2012 ◽  
Vol 26 (10) ◽  
pp. 1194-1202 ◽  
Author(s):  
Yue Li
Keyword(s):  
Volatile Organic Compounds ◽  
Real Time ◽  
Organic Compounds ◽  
Allium Cepa ◽  
Direct Analysis ◽  
Ion Source ◽  
Citrus Limon ◽  
Volatile Organic

Temperature-dependent release of volatile organic compounds of eucalypts by direct analysis in real time (DART) mass spectrometry

2009 ◽  
Vol 23 (15) ◽  
pp. 2241-2246 ◽  
Author(s):  
Simin D. Maleknia ◽  
Teresa M. Vail ◽  
Robert B. Cody ◽  
David O. Sparkman ◽  
Tina L. Bell ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Volatile Organic Compounds ◽  
Real Time ◽  
Organic Compounds ◽  
Direct Analysis ◽  
Temperature Dependent ◽  
Dart Mass Spectrometry ◽  
Volatile Organic

MO143UTILITY OF SIFT-MS TO EVALUATE VOLATILE ORGANIC COMPOUNDS IN NEPHROPATHIC PATIENTS' BREATH

2021 ◽  
Vol 36 (Supplement_1) ◽  
Author(s):  
Annalisa Romani ◽  
Anna Pietroboni Zaitseva ◽  
Andrea Carretta ◽  
Giulia Marrone ◽  
Chiara Vita ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Real Time ◽  
Organic Compounds ◽  
Roc Curve ◽  
Lazio Region ◽  
Test Execution ◽  
Inflammatory Status ◽  
Ckd Stage ◽  
Volatile Organic ◽  
Selected Ion Flow Tube

Abstract Background and Aims Breath analysis techniques allow detection and quantification of multiple analytes present in breath to the low parts per billion volume (ppbv) level. One such technique is selected ion flow tube–mass spectrometry (SIFT-MS), which can measure numerous volatile organic compounds (VOCs) in breath on-line and in real-time. This technique has already been used in an innovative manner to monitor infectious, inflammatory status and metabolic conditions. However, there is no evidence on its use in ambulatory patients with chronic kidney disease (CKD). End-stage-renal-disease patients are characterized by "uremic halitosis" caused by the accumulation of uremic toxins that are detectable in breath such as ammonia and amines. The aims of this study are identifying a possible correlation between the detected VOCs and the presence of CKD, moreover, exploring the range of VOCs levels in patients with different CKD stage. Method In the present study, a mobile Voice200ultra® SIFT-MS instrument was made available by the Agilent SRA Division. The SIFT-MS allowed to quantify the VOCs in CKD patients. The SIFT-MS uses a precise and controlled application of “soft” chemical ionization. We enrolled 50 CKD patients, divided into two subgroups according to the estimated glomerular filtration rate (eGFR): eGFR ≥30 mL/min/1.73m2 (A) and eGFR <30 mL/min/1.73m2 (B) compared to 18 healthy subjects (C). The anamnestic data and information about any comorbidities such as arterial hypertension, cardiovascular and metabolic diseases, were collected for each patient. In order to reduce the possible interferences in the exhaled composition induced by different lifestyles, all participants were instructed to perform hygienic procedures before the test execution. The exhaled was sampled through the use of a standard spirometry mouthpiece for single use, directly connected with the input probe to the MS detector of the instrument that was able to detect more than 30 VOCs. The processing of the sample was made through the direct use of an internal comparison library (Syft library). The SIFT-MS software instantly calculates the absolute concentration of the target compounds by interpolating mass-to-charge ratios, reaction rate coefficients and branching ratios. Results Among all the VOCs analyzed, the most significant results are observed for ammonia and isoprene. In particular, the ROC curve of ammonia highlighted statistically significant differences between the three subgroups respectively A vs C AUC=0,756 p=0,001; B vs C AUC=0,942 p<0,001; A vs B AUC=0,797 p<0,001 (Figure 1). Youden index J between subgroups B and C defines the best cut-off =0,8704 associated with the criterion ammonia concentration ≤4700 ppbv with sensitivity =94,44% and specificity = 92,59%. The ROC curve of isoprene showed statistically significant differences between the three subgroups respectively B vs C AUC=0,669 p=0,050; A vs B AUC=0,691 p=0,014 (Figure 2). These data allow us to define this a highly accurate test. The same significant results were observed also with Anova one-way test that highlighted an inversely correlation between the ammonia breath concentration and eGFR, and a direct correlation between isoprene and eGFR. Conclusion This preliminary data confirms the potential utility of SIFT-MS for the CKD diagnosis and the possible relation between the VOCs concentration and CKD stage. This exam could be a new, non-invasive, fast-performing diagnostic technique with real-time results useful for clinical management of CKD. The study was inserted in the projects: “MioMenù: nuova filiera dell’agro-industria e una cucina tracciata natura/benessere- Lazio Region” and “BioSynOL- Oil and Legumes: biodynamic and synergistic crops for naturally fortified foods and innovative products for health and sport – G.O.Tuscany Region”.

scholarly journals The Use of Amberlite Adsorbents for Green Chromatography Determination of Volatile Organic Compounds in Air

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Luis Juan-Peiró ◽  
Anne Bernhammer ◽  
Agustin Pastor ◽  
Miguel de la Guardia
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Direct Determination ◽  
Direct Analysis ◽  
Passive Samplers ◽  
Sample Treatment ◽  
Filling Material ◽  
Chromatography Analysis ◽  
Volatile Organic

Passive samplers have been widely used for volatile organic compounds determination. Following the green chemistry tendency of the direct determination of adsorbed compounds in membrane-based devices through using head space direct chromatography analysis, this work has evaluated the use of Amberlite XAD-2, XAD-4, and XAD-16 adsorbents as a filling material for passive samplers. Direct analysis of the membranes by HS-GC-MS involves a solvent-free method avoiding any sample treatment. For exposed membranes, recoveries ranged from 10% to 203%, depending on the compound and adsorbent used. The limit of the detection values ranged from 1 to 140 ng per sampler. Acceptable precision and sensitivity levels were obtained for the XAD resins assayed.

Exercising substituents in porphyrins for real time selective sensing of volatile organic compounds

2018 ◽  
Vol 257 ◽  
pp. 389-397 ◽  
Author(s):  
A.D. Rushi ◽  
K.P. Datta ◽  
P. Ghosh ◽  
A. Mulchandani ◽  
M.D. Shirsat
Keyword(s):  
Volatile Organic Compounds ◽  
Real Time ◽  
Organic Compounds ◽  
Volatile Organic

Real-Time Monitoring Distance Changes in Surfactant-Coated Au Nanoparticle Films upon Volatile Organic Compounds (VOCs)

2015 ◽  
Vol 119 (9) ◽  
pp. 5098-5106 ◽  
Author(s):  
M. C. Dalfovo ◽  
L. J. Giovanetti ◽  
J. M. Ramallo-López ◽  
R. C. Salvarezza ◽  
F. G. Requejo ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Real Time ◽  
Organic Compounds ◽  
Au Nanoparticle ◽  
Real Time Monitoring ◽  
Nanoparticle Films ◽  
Volatile Organic

A Wearable and Wireless Sensor System for Real-Time Monitoring of Toxic Environmental Volatile Organic Compounds

2009 ◽  
Vol 9 (12) ◽  
pp. 1734-1740 ◽  
Author(s):  
Francis Tsow ◽  
Erica Forzani ◽  
Anant Rai ◽  
Rui Wang ◽  
Ray Tsui ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Real Time ◽  
Organic Compounds ◽  
Sensor System ◽  
Wireless Sensor ◽  
Real Time Monitoring ◽  
Volatile Organic

A New Real-Time Technique for Complex-mixture of Volatile Organic Compounds Monitoring

2013 ◽  
Vol 2013 (1) ◽  
pp. 3628
Author(s):  
Hao-Yu Lu ◽  
Shih-Wei Tsai ◽  
Shih-An Tsai ◽  
Chien-Lin Huang ◽  
Shih-Chi Chu ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Real Time ◽  
Organic Compounds ◽  
Complex Mixture ◽  
Volatile Organic
Sign in / Sign up

Export Citation Format

Share Document