Are new volatile organic compounds being found?5 answersNew volatile organic compounds (VOCs) are continuously being discovered in various environments and biological samples. Studies have identified a wide range of VOCs emitted by organisms, including microbial VOCs (mVOCs) from bacteria and fungi. Additionally, unexpected high concentrations of VOCs, such as trichloroethene and tetrachloroethene, were found in the unconfined aquifer beneath the Hanford Site, indicating ongoing discoveries of VOC contamination. In the medical field, VOC analysis has shown promise in predicting disease states, with research focusing on developing accurate predictive models using VOCs as biomarkers, including for preterm birth prediction. Furthermore, plants emit various VOCs, such as green leaf volatiles, terpenes, and phenylpropanoids, which are continuously studied using advanced analytical methods like thermal desorption and solid phase microextraction. Overall, the discovery of new VOCs remains an active area of research across different disciplines.
How biogenic volatile organic compounds affect plant-microbe interaction?4 answersBiogenic volatile organic compounds (VOCs) play a significant role in plant-microbe interactions by influencing microbial behavior and plant responses. Microbes emit VOCs that can inhibit the growth of phytopathogens, trigger specific responses in beneficial fungi, and modulate the interactions between antagonistic microorganisms. These VOCs can reduce biofilm formation, affect swimming motility of bacteria, and induce changes in gene expression related to stress response and antimicrobial activity. Furthermore, VOCs produced by microbes like Pythium oligandrum can lead to growth inhibition and damage in pathogenic fungi, ultimately reducing their virulence towards plant hosts. Overall, biogenic VOCs serve as essential signaling molecules that mediate complex interactions in the plant-microbe ecosystem, influencing growth, defense mechanisms, and overall ecological balance.
Ornamental Plant's Response to Volatile Organic Compounds (VOCs)??5 answersOrnamental plants respond to volatile organic compounds (VOCs) through various mechanisms. VOCs emitted by flowers play essential roles in attracting pollinators, defending against pathogens, and responding to stress. Different ornamental plants, such as roses and Dendrobium species, emit a variety of VOCs, including terpenoids, aromatics, and fatty acids, contributing to their unique scents. The biosynthesis of floral VOCs is regulated by specific transcription factors like R2R3-MYB proteins, which interact with scent-related genes and are induced by plant hormones like auxin. Additionally, electronic nose technology can accurately analyze and differentiate between different ornamental plant accessions based on their volatile profiles, providing a rapid and precise method for assessing scent intensity and composition. Overall, the response of ornamental plants to VOCs involves intricate biochemical pathways and regulatory mechanisms that influence their fragrance and ecological interactions.
Where do volatile organic compounds come from?5 answersVolatile organic compounds (VOCs) come from various sources. Microalgae are known to produce VOCs, which can be obtained from the biomass or released into the medium. Bacterial and fungal species also produce VOCs, with approximately 1000 microbial VOCs documented so far. Indoor VOCs mainly originate from furniture and building materials, such as construction materials and wood-based panels. These VOCs can have adverse health effects and are a concern for indoor air quality. Overall, VOCs can be emitted by microorganisms, indoor sources, and various materials, and understanding their sources is important for assessing their impact on human health and the environment.
What are the most common methods used to analyze plant chemical composition?5 answersThe most common methods used to analyze plant chemical composition include extraction, isolation, and characterization techniques. Traditional methods such as maceration, percolation, and Soxhlet extraction are commonly used, but modern approaches like microwave-assisted extraction (MAE), ultrasound-assisted extraction (UAE), pressurized liquid extraction (PLE), supercritical fluid extraction (SFE), and enzyme-assisted extraction offer improved yields and efficiency. Chromatographic techniques, such as high-performance liquid chromatography (HPLC) and gas chromatography (GC), are commonly employed for separation and quantification, while spectroscopic techniques like nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry (MS) provide valuable structural information. Other methods like high-throughput screening, chemoinformatics, network pharmacology, multivariate data analysis, and computational modeling can also enhance phytochemical investigations.
What are the volatile organic compounds in baker's yeast?2 answersBaker's yeast produces a variety of volatile organic compounds (VOCs) including aldehydes, alcohols, esters, terpenoids, and thiols. Some specific VOCs produced by baker's yeast include acetaldehyde, acetone, ethyl acetate, ethanol, hexanal + isobutyl alcohol, and propanol. These compounds are important for the flavor and aroma of baked goods. The production of VOCs by baker's yeast is influenced by factors such as the type of substrate used, the presence of glucose or sucrose, and the physiological condition of the yeast. Additionally, the stereoselectivity of baker's yeast in reducing certain compounds can result in the production of specific VOCs, such as saturated alcohols. Overall, the volatile organic compounds produced by baker's yeast play a significant role in the sensory characteristics of baked products.