The electron ionization (EI) mass spectra of saturated and alpha,beta-unsaturated C(19) isoprenoid aldehydes and carboxylic acid methyl and trimethylsilyl esters are reported. Different pathways are proposed in order to explain the main fragmentations observed. The conjugated double bond migrates more or less readily before gamma-hydrogen rearrangement according to the structure of the considered compound. Configurations of the double bond of alpha,beta-unsaturated C(19) isoprenoid aldehydes and fatty acid methyl and trimethylsilyl esters can be easily determined thanks to the peaks at m/z 97, 127 and 185, respectively, which are much more abundant in the mass spectra of the Z isomers owing to the formation of a cyclic ion. In the case of trimethylsilyl esters, subsequent fragmentation of the cyclic ion at m/z 185 affords two other diagnostic ions at m/z 95 and 169.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/rcm.1004 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Antifungal, Antioxidant Activity, and GC-MS Profiling of Diaporthe amygdali GWS39: A First Report Endophyte from Geranium wallichianum.
Curr Microbiol
December 2024
Plant Pathology, Mycology and Microbiology Research Laboratory, Department of Botany, University of Kashmir, Srinagar, Jammu and Kashmir, 190006, India.
Endophytic fungi serve as vital reservoirs of natural products. This study investigates the role of the endophytic fungus, Diaporthe amygdali GWS39, isolated from Geranium wallichianum D. Don Ex Sweet aerial stem.
View Article and Find Full Text PDFOptimal fermentation of Shuanghuanglian and its effects on production performance of laying hens.
Front Vet Sci
October 2024
College of Life Science, Northeast Agricultural University, Harbin, China.
Background: Shuanghuanglian is a Chinese medicine composed of , , and . It has various effects, including anti-inflammatory, antibacterial, antiviral, and immunomodulatory effects. The fermented product of Shuanghuanglian can be used as an antibiotic alternative, as it has similar efficacy, which may improve the immunity, feed intake and utilization efficiency of laying hens, thus improving their production performance.
View Article and Find Full Text PDFMicrobial dynamics, chemical profile, and bioactive potential of diverse Egyptian marine environments from archaeological wood to soda lake.
Sci Rep
September 2024
Bioprocess Development Department, Genetic Engineering & Biotechnology Research Institute (GEBRI), City of Scientific Research & Technological Applications, Alexandria, Egypt.
Halophilic archaea are a unique group of microorganisms that thrive in high-salt environments, exhibiting remarkable adaptations to survive extreme conditions. Archaeological wood and El-Hamra Lake serve as a substrate for a diverse range of microorganisms, including archaea, although the exact role of archaea in archaeological wood biodeterioration remains unclear. The morphological and chemical characterizations of archaeological wood were evaluated using FTIR, SEM, and EDX.
View Article and Find Full Text PDFEvaluating the Potential of Bacillus Isolates for Chlorpyrifos Degradation and Their Role in Tea Growth Promotion and Suppression of Pathogens.
Curr Microbiol
August 2024
Microbial Biotechnology Laboratory, Life Science Division, Institute of Advanced Study in Science and Technology (IASST), Paschim Boragaon, Garchuk, Guwahati, Assam, 781035, India.
Pesticides employed for controlling domestic and agricultural pests are among the most dangerous environmental contaminants. Nevertheless, negligent usage and a lack of technical expertise have led to the contamination and pollution of various ecological niches. The extensive utilization of the organophosphate chlorpyrifos (CPs) for insect infestation control, coupled with its detrimental effects and persistence in the ecosystem, has led to calls for its removal from contaminated sites.
View Article and Find Full Text PDFCompositional Analysis of Cutin in Maize Leaves.
Cold Spring Harb Protoc
August 2024
Department of Biology, School of Life Sciences and the Environment, Algoma University, Sault Ste. Marie, Ontario P6A 2G4, Canada
The cuticle is a lipid barrier that covers the air-exposed surfaces of plants. It consists of waxes and cutin, a cell wall-attached lipid polyester of oxygenated fatty acids and glycerol. Unlike waxes, cutin is insoluble in organic solvents, and its composition is typically studied by chemical depolymerization followed by monomer analysis by gas chromatography (GC).
View Article and Find Full Text PDFWant 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!