scholarly journals n-alkanes in needle waxes of Pinus heldreichii var. pancici

2010 ◽  
Vol 75 (10) ◽  
pp. 1337-1346 ◽  
Author(s):  
Biljana Nikolic ◽  
Vele Tesevic ◽  
Iris Djordjevic ◽  
Milka Jadranin ◽  
Marina Todosijevic ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Chain Length ◽  
Gas Chromatography Mass Spectrometry ◽  
Average Chain Length ◽  
Epicuticular Waxes ◽  
Carbon Preference Index ◽  
Preference Index ◽  
Hexane Extracts ◽  
High Level

This is the first report of n-alkanes in needle epicuticular waxes of variety of Bosnian pine, Pinus heldreichii var. pancici. n-Hexane extracts of needle samples, originated from seven isolated localities in Serbia, were analysed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). The results exhibited nalkanes in epicuticular waxes ranging from C18 to C33. The most abundant alkanes were C27, C23, C25 and C29 (12.53 %, 12.46 %, 12.00 % and 10.38 % on average, respectively). The carbon preference index (CPItotal) of Pinus heldreichii var. pancici ranges from 1.1 to 2.1 (1.6 on average), while average chain length (ACLtotal) ranges from 25.0 to 25.8 (25.3 on average). A high level of individual quantitative variation in all of these hydrocarbon parameters was also obtained. The obtained results were compared with the bibliographic references for Pinus heldreichii var. leucodermis and other species of the Pinus genus.

scholarly journals Nonacosan-10-ol and n-Alkanes in Leaves of Pinus pinaster

2020 ◽  
Vol 15 (5) ◽  
pp. 1934578X2092607
Author(s):  
Biljana Nikolić ◽  
Marina Todosijević ◽  
Iris Đorđević ◽  
Jovana Stanković ◽  
Zorica S. Mitić ◽  
...  
Keyword(s):  
Chain Length ◽  
Pinus Pinaster ◽  
Cuticular Wax ◽  
Short Chain ◽  
Average Chain Length ◽  
Carbon Preference Index ◽  
Preference Index ◽  
Long Chain

In leaf cuticular wax of Pinus pinaster, content of nonacosan-10-ol is high (77.1% on average). n-Alkanes ranged from C18 to C35 with the most dominant C29 (24.8%). The carbon preference index (CPItotal) ranged from 3.1 to 5.6 (4.0 on average), while the average chain length (ACLtotal) ranged from 14.0 to 17.0 (14.8 on average). Long-chain n-alkanes ( n-C25-35) strongly dominated (80.1%) over middle-chain ( n-C21-24 = 18.9%) and short-chain ( n -C18-20 = 0.9%) n-alkanes.

scholarly journals Alkanes from plants of the genus achillea

1999 ◽  
Vol 64 (7-8) ◽  
pp. 443-446 ◽  
Author(s):  
Radosav Palic ◽  
Timothy Eglinton ◽  
Bryan Benitez-Nelson ◽  
Geoffrey Eglinton ◽  
Jasmina Velikovic ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Capillary Gas Chromatography ◽  
Carbon Number ◽  
Carbon Preference Index ◽  
Main Compound ◽  
Preference Index

The hydrocarbon fractions of three species of Achillea L. have been analysed by capillary gas chromatography (GC) and GC-mass spectrometry(GC-MS) and were shown to consist of the conventional, odd-carbon number dominant distributions of n-alkane homologues (C22-C35 )-n-Nonacosane (C29) is the main compound (ca.40%), and the carbon preference index (CPI) is high (ca.11)

scholarly journals The Use Of Chemical Composition And Additives To Classify Petrol And Diesel Using Gas Chromatography–Mass Spectrometry And Chemometric Analysis: A Uk Study

2019 ◽  
Vol 17 (1) ◽  
pp. 183-197 ◽  
Author(s):  
Praew Suppajariyawat ◽  
Ana Flavia Belchior de Andrade ◽  
Mathieu Elie ◽  
Mark Baron ◽  
Jose Gonzalez-Rodriguez
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Chemical Composition ◽  
Principal Component ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Four Seasons ◽  
Forensic Scientists ◽  
High Level ◽  
Leave One Out

AbstractThe identification of the fuel found in a crime scene and establishing its source is important for forensic investigations. In this study petrol and diesel samples were analysed in order to identify chemical composition and additives with the aim of obtaining a set of markers or compounds that will allow forensic scientists to identify fuel sources. The study was performed using petrol and diesel sold in the city of Lincoln (UK) during four seasons (winter, spring, summer, autumn).Diesel samples, representing eight different brands were analyzed by gas chromatography−mass spectrometry (GC−MS) and principal component analysis (PCA). From the GC–MS analytical results, MTBE and ETBE were identified as the additive more preferably added in super unleaded petrol samples that can be used to aid in separation and identification. In diesel, the distribution of FAME contents showed the effect of seasonal variation as these were found in all spring, summer and autumn samples, but not found in all winter ones. The selection of a reduced number of key fuel compounds and additives was also shown to be sufficient to achieve a high level of classification among the different fuel samples. Leave–one–out cross–validation was applied in order to validate the results.

Identification of the saturated oxo fatty acids in cheese

1992 ◽  
Vol 59 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Elizabeth Y. Brechany ◽  
William W. Christie
Keyword(s):  
Mass Spectrometry ◽  
Fatty Acids ◽  
Gas Chromatography ◽  
Methyl Ester ◽  
Chain Length ◽  
Column Chromatography ◽  
Silver Ion ◽  
Picolinyl Ester ◽  
Gas Chromatography Mass Spectrometry ◽  
First Time

SummaryThe nature and composition of the saturated oxo fatty acids in Cheddar cheese have been re-evaluated following isolation by moern chromatographic procedures, including low-pressure column chromatography and HPLC (adsorption and silver ion modes). The oxo fatty acids were identified and quantified (for the first time) by gas chromatography–mass spectrometry in the form of the methyl ester derivatives and many of the structures were confirmed similarly by preparing picolinyl ester derivatives. Thirty-six saturated oxo fatty acids were identified, ranging in chain length from 9 to 22 with an oxo group on carbons 4–17 (except for 12), of which twenty-one had been identified in a previous study and fifteen were new. Fifteen fatty acids tentatively identified by others did not in fact appear to be present.

scholarly journals The Aroma Profiles of Thai Green Teas Derived from Two Varieties, Chinese and Assam

2017 ◽  
Vol 12 (8) ◽  
pp. 1934578X1701200
Author(s):  
Toshio Hasegawa ◽  
Yuka Hayakawa ◽  
Piyaporn Chueamchaitrakun ◽  
Atsushi Takahashi ◽  
Kenta Nakajima ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Green Tea ◽  
Camellia Sinensis ◽  
Fractional Distillation ◽  
Gas Chromatography Mass Spectrometry ◽  
Gas Chromatography Olfactometry ◽  
Aroma Characteristics ◽  
Hexane Extracts ◽  
The Rich

Camellia sinensis cultivated for tea has two varieties: Camellia sinensis var. sinensis (Chinese variety) and Camellia sinensis var. assamica (Assam variety). Japanese green teas are mainly produced from the Chinese variety, whereas Thai green teas are made from both varieties. The odors of Thai green teas made from each variety differ from each other and are also distinct from that of Japanese green tea. Here, we investigated the characteristics of the aroma of Thai green teas (Chinese and Assam varieties) and Japanese green tea (Chinese variety) following fractional distillation of their hexane extracts. Each fraction was analyzed by gas chromatography-olfactometry (GC-O) and gas chromatography-mass spectrometry (GC-MS). We found that the rich aroma characteristics of Thai green tea depend on whether the Chinese or the Assam variety is used.

Tentative identification of volatile components of pineapple juice from varieties Red Spanish and PR 1-67

1969 ◽  
Vol 73 (3) ◽  
pp. 189-194
Author(s):  
Noemi Díaz ◽  
Javier Rivera
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Gas Chromatography Mass Spectrometry ◽  
Volatile Components ◽  
Tentative Identification ◽  
Pineapple Juice ◽  
Chromatography Mass Spectrometry ◽  
Hexane Extracts

The volatile components of pineapple varieties Red Spanish and PR 1—67 were analyzed by combination gas chromatography—mass spectrometry. Hexane extracts of juice were assayed with a 60 m X 0.32 mm cross-linked methyl silicon column. Twenty-six components, including 16 esters, 9 hydrocarbons and a furanone, were tentatively identified. Twelve of the components had never been reported in pineapple.

scholarly journals Leaf epicuticular waxes of eleven Euphorbia species (Euphorbiaceae) from the Central Balkans: Impact on chemotaxonomy

2019 ◽  
Vol 71 (1) ◽  
pp. 21-26
Author(s):  
Gordana Krstic ◽  
Ivana Aljancic ◽  
Jovana Stankovic ◽  
Mirjana Cvetkovic ◽  
Petar Marin ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Free Acid ◽  
Principal Component ◽  
Epicuticular Wax ◽  
Gas Chromatography Mass Spectrometry ◽  
Epicuticular Waxes ◽  
Free Alcohol ◽  
Chemotaxonomic Markers ◽  
Leaf Epicuticular Wax

The presence of n-alkanes, free alcohols and free acids in leaf epicuticular wax extracts of 22 samples of 11 Euphorbia L. species belonging to the sections Paralias, Esula, Myrsiniteae and Helioscopia, 10 of which were never examined before, were analyzed by gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS), and n-alkane C27 was detected as the principal component of leaf epicuticular waxes in the majority of the examined species, while the most abundant free alcohol was C26. Three Euphorbia species belonging to section Helioscopia were characterized by a predominance of alcohol C28. Free acid (C16) was the major component in 21 investigated samples. The usefulness of n-alkanes and free alcohols and free acids as potential chemotaxonomic markers is briefly discussed.

scholarly journals Nonacosan-10-ol and n-Alkanes in Needles of Pinus halepensis

2020 ◽  
Vol 15 (5) ◽  
pp. 1934578X2092097
Author(s):  
Biljana Nikolić ◽  
Marina Todosijević ◽  
Iris Đorđević ◽  
Jovana Stanković ◽  
Zorica S. Mitić ◽  
...  
Keyword(s):  
Chain Length ◽  
Pinus Halepensis ◽  
Cuticular Wax ◽  
Average Chain Length ◽  
Carbon Preference Index ◽  
Preference Index ◽  
Long Chain

In needle cuticular wax of Pinus halepensis, nonacosan-10-ol is high (77.08% on average). n-Alkanes ranged from C18 to C35 with the most dominant C27 and C29 (32.4% and 25.8%, respectively). The carbon preference index ranged from 3.2 to 5.4 (3.4 on average), while the average chain length ranged from 14.0 to 18.0 (17.2 on average). Long-chain n-alkanes strongly dominated (95.1%).

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