scholarly journals Oddy Tests: Adding the Analytical Dimension

2015 ◽  
Vol 29 (1-2) ◽  
pp. 22-36 ◽  
Author(s):  
Gail Gali Beiner ◽  
Miriam Lavi ◽  
Hadas Seri ◽  
Anna Rossin ◽  
Ovadia Lev ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Time Frame ◽  
Gas Chromatography Mass Spectrometry ◽  
Qualitative And Quantitative ◽  
Ms Analysis ◽  
Oddy Test ◽  
Volatile Organic ◽  
Quantitative Manner ◽  
And Storage ◽  
Analytical Dimension

Abstract The so-called “Oddy test” has gained popularity in art and archaeology collections because it is inexpensive to use, and the results are relatively easy to analyze. However, the method is also subjective and does not identify the pollutants. Here we present a modification to the traditional test that addresses these drawbacks and aims at providing solutions. Activated carbon was used to adsorb the volatile emissions generated within the standard Oddy test setup. Gas chromatography–mass spectrometry (GC-MS) analysis of the volatile organic compounds (VOCs) desorbed from the activated carbon detected pollutants within a considerably shorter time frame than the traditional Oddy test and provided both qualitative and quantitative data. GC-MS analysis of volatiles off-gassed during the Oddy test provided information about the VOCs from local brands of materials commonly used for conservation and storage of objects in collections. The use of GC-MS analysis of volatiles improves the Oddy test in a fast, sensitive, and quantitative manner.

scholarly journals Sampling Dynamics for Volatile Organic Compounds Using Headspace Solid-Phase Microextraction Arrow for Microbiological Samples

Separations ◽  
2018 ◽  
Vol 5 (3) ◽  
pp. 45 ◽  
Author(s):  
Kevin Eckert ◽  
David Carter ◽  
Katelynn Perrault
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Fiber Type ◽  
Gas Chromatography Mass Spectrometry ◽  
Ms Analysis ◽  
Wide Range ◽  
Volatile Organic ◽  
Agricultural Applications

Volatile organic compounds (VOCs) are monitored in numerous fields using several commercially-available sampling options. Sorbent-based sampling techniques, such as solid-phase microextraction (SPME), provide pre-concentration and focusing of VOCs prior to gas chromatography–mass spectrometry (GC–MS) analysis. This study investigated the dynamics of SPME Arrow, which exhibits an increased sorbent phase volume and improved durability compared to traditional SPME fibers. A volatile reference mixture (VRM) and saturated alkanes mix (SAM) were used to investigate optimal parameters for microbiological VOC profiling in combination with GC–MS analysis. Fiber type, extraction time, desorption time, carryover, and reproducibility were characterized, in addition to a comparison with traditional SPME fibers. The developed method was then applied to longitudinal monitoring of Bacillus subtilis cultures, which represents a ubiquitous microbe in medical, forensic, and agricultural applications. The carbon wide range/polydimethylsiloxane (CWR/PDMS) fiber was found to be optimal for the range of expected VOCs in microbiological profiling, and a statistically significant increase in the majority of VOCs monitored was observed. B. subtilis cultures released a total of 25 VOCs of interest, across three different temporal trend categories (produced, consumed, and equilibrated). This work will assist in providing foundational data for the use of SPME Arrow in future microbiological applications.

scholarly journals Volatile Organic Compounds at Early Stages of Sourdough Preparation Via Static Headspace and GC/MS Analysis

2017 ◽  
Vol 5 (2) ◽  
pp. 89-99
Author(s):  
Fritz Pizarro ◽  
Francisco Franco
Keyword(s):  
Volatile Compounds ◽  
Room Temperature ◽  
Gas Chromatography Mass Spectrometry ◽  
Static Headspace ◽  
Whole Wheat ◽  
Ms Analysis ◽  
Static Headspace Gas Chromatography ◽  
Volatile Organic ◽  
Headspace Gas ◽  
Area Percent

Major aroma volatile compounds from whole wheat and all-purpose sourdough and their evolution were evaluated through static headspace gas chromatography-mass spectrometry (SHS-GC/MS) analysis during 28 days of fermentation. Sourdoughs were prepared on 1:1 ratio of flour to water (mass to volume) and fermented spontaneously at room temperature. GC/MS measurements for the evolution of aroma volatile compounds were conducted at 24, 168, 336, 504, and 672 hours of fermentation. Whole wheat sourdough contained more aroma volatile compounds (62) than all-purpose sourdough (45). The major aroma volatile compounds of whole wheat sourdough were hydrocarbons, esters, alcohols, ketones, aldehydes, and heterocycles. Meanwhile, aldehydes were dominant in the all-purpose sourdough. During whole wheat sourdough fermentation, a decrease in peak area percent was observed for aldehydes, ketones, and heterocycles, whereas an increase in the case of hydrocarbons. On the other hand, aldehydes dramatically increased in peak area percent for all-purpose sourdough. Aroma volatile compounds emanating from sourdough fermentation can aid consumers as well as manufacturers with regards to the quality, shelf-life, and what characteristic aromas the final bread product will possess.

scholarly journals Qualitative and Quantitative Analysis (GC-MS) of Methanol Extract of Crataeva nurvala stem bark

2021 ◽  
Vol 52 (2) ◽  
Author(s):  
K. K. Aathira ◽  
John Kariyil Bibu ◽  
G. Dhanusha ◽  
J. S. Haima ◽  
S. Sujith ◽  
...  
Keyword(s):  
Methanol Extract ◽  
Stem Bark ◽  
New Drugs ◽  
Gas Chromatography Mass Spectrometry ◽  
Phytochemical Analysis ◽  
Qualitative And Quantitative Analysis ◽  
Chemical Profiling ◽  
Qualitative And Quantitative ◽  
Ms Analysis ◽  
Ancient Times

Medicinal plants are precious source of bioactive compounds which possess a range of beneficial properties and serve as the major source of medicine for a large proportion of population across the world. Since ancient times, Crataeva nurvala has been used as a vital herb in Ayurvedic system of medicine. In Unani system of medicine the bark of C. nurvala is used as an appetite stimulant and as an agent to decrease the secretion of bile and phlegm. In the present study, the methanol extract of stem bark of C. nurvala was analysed for preliminary phytochemicals and the chemical profiling of the extract was illustrated using gas chromatography mass spectrometry (GC-MS) analysis. The phytochemical analysis revealed that the plant extract contained alkaloids, steroids and triterpenoids. The GC-MS analysis determined the presence of different compounds of biological importance. The identification and characterisation of the phytoconstituents in the extract could pave the way for the discovery of new drugs for various ailments.

Comparative analysis of essential oil obtained from fresh and dried leaves of medicinal sage

2020 ◽  
pp. 39-53
Author(s):  
Tatyana Shcheglova
Keyword(s):  
Comparative Analysis ◽  
Essential Oil ◽  
Raw Materials ◽  
Quantitative Difference ◽  
Botanical Garden ◽  
Component Composition ◽  
Gas Chromatography Mass Spectrometry ◽  
Qualitative And Quantitative ◽  
Salvia Officinalis L ◽  
Medical University

The article presents results of the study of a comparative analysis of essential oil obtained from fresh and dried leaves of medicinal sage (Salvia officinalis L.), growing in the Botanical Garden of the First Moscow State Medical University named after Sechenov. The studies were carried out using gas chromatography– mass spectrometry. Qualitative and quantitative difference in the component composition of the essential oil obtained from fresh and dried raw materials was determined as a result of the study.

Comparison of the Effects of Silver in Nanostructured and Ultrahigh Diluted Form on Growth and Volatile Compounds Produced by Escherichia coli and Staphylococcus aureus

2020 ◽  
Vol 10 (3) ◽  
pp. 316-329
Author(s):  
Fateme Mirzajani ◽  
Amin Hamidi
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Life Cycles ◽  
Gas Chromatography Mass Spectrometry ◽  
Untreated Sample ◽  
E Coli ◽  
Volatile Metabolites ◽  
Octyl Acetate ◽  
Volatile Organic ◽  
And Staphylococcus Aureus

Introduction: In this project, the growth and volatile metabolites profiles of Escherichia coli (E. coli ) and Staphylococcus aureus were monitored under the influence of silver base chemical, nanoparticle and ultra-highly diluted compounds. Materials & Methods: The treatments were done for 12000 life cycles using silver nanoparticles (AgNPs) as well as ultra-highly diluted Argentum nitricum (Arg-n). Volatile organic metabolites analysis was performed using gas chromatography mass spectrometry (GC-MS). The results indicated that AgNPs treatment made the bacteria resistant and adapted to growth in the nanoparticle condition. The use of ultra-highly diluted Arg-n initially increased growth but it decreased later. Also, with the continuous usage of these materials, no more bacterial growth was observed. Results: The most important compounds produced by E. coli are Acetophenone, Octyl acetate, Styrene, 1,8-cineole, 4-t-butyl-2-(1-methyl-2-nitroethyl)cyclohexane, hexadecane and 2-Undecanol. The main compounds derived from S. aureus are Acetophenone,1,8-cineole, Benzaldehyde, 2-Hexan-1-ol, Tridecanol, Dimethyl Octenal and tetradecane. Acetophenone and 1,8-cineole were common and produced by both organisms. Conclusion: Based on the origin of the produced volatiles, main volatiles percentage of untreated sample is hydrocarbon (>50%), while bacteria treatments convert the ratio in to aldehydes, ketones and alcohols in the case of AgNPs, (>80%) and aldehydes, ketones and terpenes in the case of Arg-n (>70%).

scholarly journals The Analysis of Bayer Liquor by SPME-GC-MS of Derivatized Organic Poisons

Proceedings ◽  
2021 ◽  
Vol 57 (1) ◽  
pp. 101
Author(s):  
Virgil Badescu ◽  
Raluca Senin
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Gas Chromatography Mass Spectrometry ◽  
Bayer Liquor ◽  
Chromatography Mass Spectrometry ◽  
Ms Analysis ◽  
Silylating Agent

The aim of this article was the gas chromatography–mass spectrometry (GC-MS) analysis oforganic matter from a residual liquor sample (S.C. Alum S.A., Tulcea), extracted by the solid-phasemicroextraction method (SPMA) and derivatized with N-(tert-butyldimethylsilyl)-Nmethyltrifluoroacetamide(MTBSTFA) as the silylating agent. [...]

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