scholarly journals Fast and Reliable Multiresidue Analysis of Aromas in Wine by Means of Gas Chromatography Coupled with Triple Quadrupole Mass Spectrometry

Analytica ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 38-49
Author(s):  
Ettore Guerriero ◽  
Massimo Iorizzo ◽  
Marina Cerasa ◽  
Ivan Notardonato ◽  
Bruno Testa ◽  
...  
Keyword(s):  
Direct Injection ◽  
Headspace Analysis ◽  
White Wine ◽  
Quadrupole Mass ◽  
Multiresidue Analysis ◽  
Liquid Liquid Extraction ◽  
Volatile Organic ◽  
Steel Tank ◽  
First Time

The paper would like to show a direct injection into GC-MS/QqQ for the determination of secondary aromas in white wine samples fermented in two different ways. The procedure has been compared with more traditional methods used in this field, i.e., headspace analysis and liquid–liquid extraction. The application of such direct injection, for the first time in the literature, allows us to analyze Volatile Organic Compounds (VOCs) in the range 0.1–100 µg mL−1, with Limits of Detection (LODs) and Limits of Quantification (LOQs) between 0.01–0.05 µg mL−1 and 0.03–0.09 µg mL−1, respectively, intraday and interday below 5.6% and 8.5%, respectively, and recoveries above 92% at two different fortification levels. The procedure has been applied to real wine samples: it evidences how the fermentation in wood (cherry) barrel yields higher VOC levels than ones in wine fermented in steel tank, causing production of different secondary aromas and different relative flavors.

scholarly journals Evaluation of a modified halo flowing atmospheric pressure afterglow ion source for the analysis of directly injected volatile organic compounds

2020 ◽  
Vol 35 (9) ◽  
pp. 2002-2010
Author(s):  
Jonatan Fandino ◽  
Jaime Orejas ◽  
Laura Chauvet ◽  
David Blanco ◽  
Philippe Guillot ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Atmospheric Pressure ◽  
Direct Injection ◽  
Ion Source ◽  
Analytical Tool ◽  
Volatile Organic ◽  
Flowing Atmospheric Pressure Afterglow

hFAPA ion source as an analytical tool for the determination of volatile organic compounds in gas samples by direct injection.

Gas-Liquid Chromatographic Headspace Method for Vinyl Chloride in Vinegars and Alcoholic Beverages

1976 ◽  
Vol 59 (1) ◽  
pp. 30-31
Author(s):  
David T Williams
Keyword(s):  
Mass Spectrometry ◽  
Vinyl Chloride ◽  
Limit Of Detection ◽  
Direct Injection ◽  
Headspace Analysis ◽  
Alcoholic Beverages ◽  
Gas Chromatography Mass Spectrometry ◽  
Injection Methods ◽  
Liquid Chromatographic

Abstract Vinyl chloride (VC) is determined in vinegars and alcoholic beverages by gas-liquid chromatographic headspace analysis. The lower limit of detection is 10 ppb and confirmation by gas chromatography-mass spectrometry, single ion monitoring at m/e 62, is possible at this level. Comparison of the headspace and the direct injection methods for the determination of VC in vinegars and alcoholic beverages showed that the results obtained by the 2 methods were not significantly different (P>0.05).

scholarly journals MASS SPECTROMETRIC STUDIES OF THE COMPOSITION OF VOLATILE ORGANIC COMPOUNDS RELEASED BY VARIOUS FUNGAL SPECIES OF GENUS LECANICILLIUM

2021 ◽  
Vol 31 (4) ◽  
pp. 71-78
Author(s):  
A. G. Kuzmin ◽  
Keyword(s):  
Acetic Acid ◽  
Volatile Organic Compounds ◽  
Gas Phase ◽  
Organic Compounds ◽  
Plant Protection ◽  
Fungal Species ◽  
Quadrupole Mass ◽  
Volatile Organic ◽  
First Time ◽  
Chemical Pesticides

For the first time, the quantitative and qualitative composition of volatile organic compounds (VOCs), released by strains of various species of entomopathogenic fungi (EF) of the genus Lecanicillium, was studied using a quadrupole mass spectrometer. Lecanicillium fungi are used as an alternative to chemical pesticides for plant protection. The main detected components of the gas phase over the EF mycelium on the 10th day of growing on the agar Czapek's medium were carbon dioxide (5–20%), oxygen (0.1–15%), acetone (0.2–12 ppm), pentane (up to 0.5 ppm), acetic acid (up to 0.15 ppm). Acetone and pentane were found in the VOCs of all studied strains, acetic acid — in 5 strains belonging to different species, in other strains it appeared after a longer period of time, or was absent completely. Among the VOCs of some strains, substances such as hexyl acetate, sulfur dioxide were found in small quantities. These substances may be responsible for the pathogenic and repellent properties of the studied fungi with respect to phytophages.

Coenzymes Q9 and Q10, Vitamin E and Peroxidation in Rat Synaptic and Non-Synaptic Occipital Cerebral Cortex Mitochondria during Ageing

2001 ◽  
Vol 382 (6) ◽  
pp. 925-931 ◽  
Author(s):  
Maurizio Battino ◽  
Stefano Bompadre ◽  
Luciana Leone ◽  
Roberto F. Villa ◽  
Antonella Gorini
Keyword(s):  
Cerebral Cortex ◽  
Vitamin E ◽  
Coenzyme Q ◽  
Direct Injection ◽  
Extraction Procedure ◽  
Brain Mitochondria ◽  
Membrane Structures ◽  
First Time ◽  
The Brain

Abstract Great attention has been devoted both to ageing phenomena at the mitochondrial level and to the antioxidant status of membrane structures. These kinds of investigations are difficult to perform in the brain because of its heterogeneity. It is known that synaptic heavy mitochondria (HM) may represent an aged mitochondrial population characterized by a partial impairment of their typical mitochondrial function. We arranged a novel system requiring no extraction procedure, very limited handling of the samples and their direct injection into the HPLC apparatus, to carry out, for the first time, a systematic and concomitant determination of vitamin E, Coenzyme Q[9] (CoQ[9]) and Coenzyme Q[10] (CoQ[10]) contents in rat brain mitochondria. The trends found for CoQ[9] and CoQ[10] levels in synaptic and nonsynaptic occipital cerebral cortex mitochondria during rat ageing are consistent with previous data. Hydroperoxides (HP) differed with age and it was confirmed that in the HM fraction the summation of contributions results in an oxidatively jeopardized subpopulation. We found that vitamin E seems to increase with age, at least in nonsynaptic free (FM) and synaptic light (LM) mitochondria, while it was inclined to remain substantially constant in HM.

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