Simultaneous Extraction and Determination of Volatile Organic Compounds and Semi-volatile Organic Compounds in Indoor Air Using Multi-bed Solid Phase Extraction Device

Identification of bioactive compounds of Bacillus velezensis HNA3 that contribute to its dual effects as plant growth promoter and biocontrol against post-harvested fungi

IMPORTANCE

The current study is an extension to our previous work on the plant growth-promoting rhizobacteria (PGPR) Bacillus velezensis HNA3 strain, which comes to confirm and reveals the huge stock of active secondary metabolites produced by HNA3. HNA3-emitted volatile organic compounds (VOCs) have demonstrated the capacity to impede the growth of phytopathogens affecting some fruits and vegetables, even in the absence of direct contact. Additionally, these volatiles enhanced soybean seed germination by breaking seed dormancy and inducing root system development. Furthermore, they promoted seedling growth, giving it prominence in soybean cultivation. The relevance of active volatiles derives from the fact that they can be developed as natural-safe biocontrol agents and plant promoters. This research validates the remarkable bioactivities exhibited by the Bacillus velezensis HNA3 and their potential applications in agriculture as an inoculant, encompassing biocontrol, plant growth promotion, and seed germination activities, thereby offering a safer alternative to hazardous chemicals.

Sampling bag-based emission chamber for measuring volatile organic compounds from household materials using solid-phase extraction-type collection device

A simple screening analytical method for determining the emission of volatile organic compounds (VOCs) from household materials was developed using a solid-phase extraction (SPE)-type collection device and a gas sampling bag. The VOCs emitted from the sample material placed in the gas sampling bag with a volume of 20 L were extracted on the SPE-type collection device. In this study, complete sampling mode was developed in addition to a conventional flow sampling mode. The extracted VOCs were then eluted with 8 mL of acetone and measured using gas chromatography-mass spectrometry. The proposed method does not require a stainless-steel chamber and a thermal desorption system; therefore, VOC emission from household materials could be easily evaluated with an affordable cost, suggesting that the method is suitable for the screening technique for evaluating VOC emission from solid materials.