Results 21 to 30 of about 37,929 (259)

Efficacy and Conflicts of Interest in Randomized Controlled Trials Evaluating Headspace and Calm Apps: Systematic Review

JMIR Mental Health, 2022
BackgroundAlthough there are thousands of mental health apps, 2 apps, Headspace and Calm, claim a large percentage of the marketplace. These two mindfulness and meditation apps have reached tens of millions of active users.
Alison O'Daffer, Susannah F Colt, Akash R Wasil, Nancy Lau   +3 more
doaj   +1 more source

Streptopyridines, volatile pyridine alkaloids produced by Streptomyces sp. FORM5

Beilstein Journal of Organic Chemistry, 2014
Streptomyces sp. FORM5 is a bacterium that is known to produce the antibiotic streptazolin and related compounds. We investigated the strain for the production of volatiles using the CLSA (closed-loop stripping analysis) method.
Ulrike Groenhagen, Michael Maczka, Jeroen S. Dickschat, Stefan Schulz   +3 more
doaj   +1 more source

Prediction of the Biogenic Amines Index of Poultry Meat Using an Electronic Nose

Sensors, 2019
The biogenic amines index of fresh chicken meat samples during refrigerated storage was predicted based on the headspace analysis using an electronic nose equipped with an array of electrochemical sensors.
Wojciech Wojnowski, Kaja Kalinowska, Tomasz Majchrzak, Justyna Płotka-Wasylka, Jacek Namieśnik   +4 more
doaj   +1 more source

New tool for Gram-negative and Gram-positive bacterial strains differentiation through GC-MS direct identification of exogenous VOC metabolites in headspace vials

Romanian Journal of Ecology & Environmental Chemistry, 2022
In this paper, a chromatographic method for the determination of volatile organic compounds (VOCs) as a tool for Gram-positive and Gram-negative bacterial strains identification was described.
Florentina Laura Chiriac, Andreea Valentina Petre, Catalina Stoica, Iuliana Paun, Florinela Pirvu, Ionut Cristea, Nicoleta Vasilache, Marcela Niculescu, Gabriel Serban, Vasile Ion Iancu   +9 more
doaj   +1 more source

Headspace gas chromatography-mass spectrometry method for the determination of total cyanide concentration in water and postmortem blood samples [PDF]

Journal of the Serbian Chemical Society, 2021
In this study, we aimed to develop a headspace gas chromatography– –mass spectrometry method for determining the total cyanide concentration in the forensic evidences.
Destanoğlu Orhan, Ateş İsmail
doaj   +1 more source

Variation in Gas and Volatile Compound Emissions from Human Urine as It Ages, Measured by an Electronic Nose

Biosensors, 2016
The medical profession is becoming ever more interested in the use of gas-phase biomarkers for disease identification and monitoring. This is due in part to its rapid analysis time and low test cost, which makes it attractive for many different clinical ...
Siavash Esfahani, Nidhi M. Sagar, Ioannis Kyrou, Ella Mozdiak, Nicola O’Connell, Chuka Nwokolo, Karna D. Bardhan, Ramesh P. Arasaradnam, James A. Covington   +8 more
doaj   +1 more source

Monitoring In Vitro and In Vivo Aroma Release of Espresso Coffees with Proton-Transfer-Reaction Time-of-Flight Mass Spectrometry

Applied Sciences, 2022
This work presents in vitro and in vivo aroma release analysis of three espresso coffees carried out by PTR-ToF-MS headspace and nosespace analysis, respectively. The products were C.
Andrea Romano, Luca Cappellin, Sara Bogialli, Paolo Pastore, Luciano Navarini, Franco Biasioli   +5 more
doaj   +1 more source

Application of sHS/GC-MS method for the identification of paracetamol impurities in the selected pharmaceutical formulations

Current Issues in Pharmacy and Medical Sciences, 2012
Simple and rapid quantitative procedure based on gas chromatography mass spectrometry in combination with static headspace was developed for the identification of paracetamol and its impurities in commercially available analgesic tablets.
Rafał Pietraś, Agnieszka Staszewska, Anna Gumieniczek, Dorota Kowalczuk   +3 more
doaj   +1 more source

Improved sample storage, preparation and extraction of blueberry aroma volatile organic compounds for gas chromatography

Journal of Chromatography Open, 2023
Aroma profiles of blueberries contain a heterogeneous mixture of volatile organic compounds (VOCs), and headspace sampling is the most efficient approach to VOC extraction from berries.
Ryan P. Dias, Trevor A. Johnson, L.Felipe V. Ferrão, Patricio R. Munoz, A. Paulina de la Mata, James J. Harynuk   +5 more
doaj   +1 more source

Quantitative Analysis of NDMA in Drug Products: A Proposed High-Throughput Approach Using Headspace–SIFT-MS

AppliedChem
Since the initial 2018 recall of angiotensin receptor blockers due to unacceptable levels of mutagenic N-nitrosodimethylamine (NDMA) impurity, numerous drug products delivering diverse active pharmaceutical ingredients (APIs) have been recalled ...
Mark J. Perkins, Colin J. Hastie, Vaughan S. Langford   +2 more
doaj   +1 more source