Volatile Organic Compounds (VOCs) - BSK Associates

The maximum headspace permissible in a VOA vial is not to exceed 5 -6mm or 1/4” - roughly the size of a pea. Sample Containers . Three (3) VOA vials are required for all volatile samples collected: 40mL Sodium Thiosulfate Preserved Glass VOA Vial – Trihalomethanes only. 40mL Hydrochloric Acid Preserved Glass VOA Vial – Full List VOCs

South African Journal of Botany - CORE

b Department of Biochemistry, University of Pretoria, Pretoria 0002, South Africa article info abstract Article history: Received 30 May 2012 Received in revised form 23 August 2012 Accepted 10 September 2012 Available online 8 November 2012 Edited by GI Stafford Keywords: Alcohols Esters Monkey orange S. cocculoides Solid phase microextraction

Simultaneous analysis of acetone, methyl - ScienceDirect

Jan 01, 2020 · Urine samples were prepared in duplicate by adding 900 µL urine to an appropriately labelled headspace vial and 100 µL of the internal standard working solution. Vials were closed with a septa and aluminium crimp cap. The samples were mixed on a vortex mixer and then immediately placed on a headspace auto-sampler tray for analysis. 2.2.5.

Volatile Organic Compounds Emitted by Aspergillus flavus

Oct 06, 2021 · List of mVOCs present at least in two replicates. The values are the percentage of the total area. Identification by comparison with the NIST17 and Wiley298 mass spectra libraries, as well as by comparison between the literature retention index (RI (HP-5ms)), according to the method of Van Den Dool and Kratz on a non-polar HP-5ms column, and the calculated retention index (RI) for each mVOC.

An insight into the botanical origins of propolis from

Nov 11, 2021 · Samples. Seven propolis samples were collected in apiaries located in two municipalities of Paraná state where OP1 is produced (Table 1).Five samples were from hives that hold organic

Analysis of Relative Scent Intensity, Volatile Compounds and

Nov 17, 2020 · The analysis was performed by placing a (2 g) flower sample into a 20 mL glass vial with a screwcap. Vials were placed in an auto-sampler (HS-100, CTC Analytics, Toulouse, France). The experiment was conducted in triplicates. Ambient air was used as the control. Analytical conditions were optimized to obtain maximum sensor responses . The vials

Transcriptome and metabolite profiling - BMC Plant Biology

May 24, 2021 · Background Aroma is one the most crucial inherent quality attributes of fruit. ‘Ruixue’ apples were selected from a cross between ‘Pink Lady’ and ‘Fuji’, a later ripening yellow new cultivar. However, there is little known about the content and composition of aroma compounds in ‘Ruixue’ apples or the genetic characters of ‘Ruixue’ and its parents. In addition, the metabolic

Insect Repellents-Principles_ Method_ and Use.pdf - VSIP.INFO

Repellent Delivery Methods Most insect repellents are effective in the vapour phase, defined as vapour or olfactory repellents by Garson and Winnike as “those materials which are sufficiently volatile to keep an insect at a distance.”158 As the repellent molecules are volatile, temperature, humidity and wind affect evaporation of the

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Comparison of an Offline SPE–GC–MS and Online HS–SPME–GC–MS

In the context of this work, a validated gas chromatography–mass spectrometry (GC–MS) method for the quantitation of terpenoids in red and white wine using headspace solid-phase microextraction (HS–SPME) and solid-phase extraction (SPE) was established.

(PDF) Profiles of Volatile Biomarkers Detect Tuberculosis

For more details about the various skin sampling, please refer to SI, Section 2. Fig. 1a presents schematically the sampling and analysis with gas chromatography linked with mass spectrometry (GC-MS) as well as with o ine sensors array in conjugation with pattern recognition patterns. Gas Chromatography Mass Spectrometry (GC-MS) analysis.

What are Volatile Solids? - Definition from Corrosionpedia

Sep 12, 2019 · Volatile solids are a substance that can easily transform from its solid phase to its vapor phase without going through a liquid phase. Volatile solids normally represent the amount of organic solids in water, and have great importance in water and wastewater treatment. The amount of volatile solids in wastewater is frequently used to describe the strength of the waste.

Foods | Free Full-Text | Sensory Characteristics and Volatile

South Africa has a traditional heritage of using indigenous herbal teas, and the demand for herbal teas motivated by the functional health benefits has far exceeded global supply. This has led to worldwide interest in the sensory characteristics and volatile compound characterisation of herbal drink formulations. The objective of this study was to investigate the descriptive sensory analysis

Frontiers | Bioactive Volatiles From Push-Pull Companion

Apr 11, 2022 · Fall armyworm, Spodoptera frugiperda, is a serious invasive pest in Africa but “Push-Pull” companion cropping can substantially reduce infestation. Here, we elucidate the underpinning chemical ecology mechanisms. We hypothesized that companion crop volatiles repel herbivores (push) while attracting natural enemies (pull). Headspace volatiles collected from companion plants (Desmodium

Molecules | Free Full-Text | Phenolic and Volatile

In continuation of research conducted on species of the spontaneous flora of Sicily (Italy) belonging to the Brassicaceae family, Brassica fruticulosa subsp. fruticulosa was selected. It is an edible species utilized in Sicilian traditional medicine. In this study, for the first time, the phenolic and the volatile compounds and the antioxidant properties of the hydroalcoholic extract obtained