A method is described for automating the regulation of cold jet flow of a comprehensive two-dimensional gas chromatograph (GCxGC) configured with flame ionization detection. This new capability enables the routine automated separation, identification, and quantitation of hydrocarbon types in petroleum fractions extending into the vacuum gas oil (VGO) range (IBP-540 degrees C). Chromatographic data acquisition software is programmed to precisely change the rate of flow from the cold jet of a nitrogen cooled loop modulator of a GCxGC instrument during sample analysis. This provides for the proper modulation of sample compounds across a wider boiling range. The boiling point distribution of the GCxGC separation is shown to be consistent with high temperature simulated distillation results indicating recovery of higher boiling semi-volatile VGO sample components. GCxGC configured with time-of-flight mass spectrometry is used to determine the molecular identity of individual sample components and boundaries of different molecular types.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1093/chromsci/45.10.636 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Effect of cold plasma and ultrasonic pretreatment on drying characteristics and nutritional quality of vacuum freeze-dried kiwifruit crisps.
Ultrason Sonochem
January 2025
School of Food and Biological Engineering, Hefei University of Technology, Hefei, Anhui, China; Key Laboratory for Agriculture Products Processing of Anhui Province, Hefei, Anhui, China.
The effect of ultrasound and plasma pretreatment on freeze-dried kiwifruit crisps was investigated in this study. Using unpretreated kiwifruit as a control group (CG), the effects of ultrasound (US), plasma-activated water (PAW), ultrasound combined with plasma-activated water (UPAW), plasma-jet (PJ), and ultrasound combined with plasma-jet (UPJ) on the quality of vacuum freeze-dried kiwifruit were investigated. The results showed that all the pretreatments could change the microstructure of the crisps.
View Article and Find Full Text PDFThe Potential of a Novel Cold Atmospheric Plasma Jet as a Feasible Therapeutic Strategy for Gingivitis-A Cell-Based Study.
Cells
November 2024
Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Spl. Independentei, 050657 Bucharest, Romania.
Due to its antimicrobial, anti-inflammatory and pro-healing properties, the application of cold atmospheric plasma (CAP) has emerged as a new and promising therapeutic strategy in various fields of medicine, including general medicine and dentistry. In this light, the aim of the present study was to investigate the effects of a homemade plasma jet on the cellular behaviour of two important cell types involved in gingivitis, namely gingival fibroblasts (HGF-1 cell line) and macrophages (RAW 264.7 cell line), by the direct application of CAP in different experimental conditions.
View Article and Find Full Text PDFPropelling sustainable energy: Multi-omics analysis of pennycress FATTY ACID ELONGATION1 knockout for biofuel production.
Plant Physiol
December 2024
Department of Biological Sciences & BioDiscovery Institute, University of North Texas, Denton, TX 76203, USA.
The aviation industry's growing interest in renewable jet fuel has encouraged the exploration of alternative oilseed crops. Replacing traditional fossil fuels with a sustainable, domestically sourced crop can substantially reduce carbon emissions, thus mitigating global climate instability. Pennycress (Thlaspi arvense L.
View Article and Find Full Text PDFHeat disproportionately kills young people: Evidence from wet-bulb temperature in Mexico.
Sci Adv
December 2024
Center for Environmental Economics and Policy, Columbia University, New York, NY, USA.
Recent studies project that temperature-related mortality will be the largest source of damage from climate change, with particular concern for the elderly whom it is believed bear the largest heat-related mortality risk. We study heat and mortality in Mexico, a country that exhibits a unique combination of universal mortality microdata and among the most extreme levels of humid heat. Combining detailed measurements of wet-bulb temperature with age-specific mortality data, we find that younger people who are particularly vulnerable to heat: People under 35 years old account for 75% of recent heat-related deaths and 87% of heat-related lost life years, while those 50 and older account for 96% of cold-related deaths and 80% of cold-related lost life years.
View Article and Find Full Text PDFEast Asian synoptic climatology linked to Atlantic multidecadal variability.
J Environ Manage
January 2025
Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan.
Article Synopsis
- The Atlantic Multidecadal Oscillation (AMO) is a climate pattern that can help predict changes in weather systems globally, particularly in East Asia.
- The study analyzed data from 1941 to 2021 to see how AMO impacts the winter cold surges and late summer typhoons, finding that these weather events change in frequency depending on the AMO phase.
- Results showed that during a negative AMO phase, cold surges saw an increase while blocking surges decreased, and that the southward shift of the westerly jet stream correlated with more frequent typhoons in late summer, indicating the potential for reliable long-term climate predictions in East Asia.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!