The effect of long‐chain alkanes on flavour release and olfactory characteristics of rose essential oil

2021 ◽  
Author(s):  
Yingjie Fu ◽  
Yipeng Zhang ◽  
Shitong Zeng ◽  
Liwen Luo ◽  
Hui Xi ◽  
...  
Keyword(s):  
Essential Oil ◽  
Long Chain ◽  
Flavour Release

Antifungal essential oil and a long chain alcohol from Achyranthes aspera

1992 ◽  
Vol 31 (5) ◽  
pp. 1811-1812 ◽  
Author(s):  
Triguna N. Misra ◽  
Ram S. Singh ◽  
Hari S. Pandey ◽  
C. Prasad ◽  
Bishnu P. Singh
Keyword(s):  
Essential Oil ◽  
Chain Alcohol ◽  
Achyranthes Aspera ◽  
Long Chain Alcohol ◽  
Long Chain

scholarly journals Quantitative structure-gas chromatographic retention index relationship of long-chain esters: The case of Scandix pecten-veneris L. essential-oil constituents

2016 ◽  
Vol 14 (2) ◽  
pp. 97-104 ◽  
Author(s):  
Marko Mladenovic ◽  
Niko Radulovic
Keyword(s):  
Essential Oil ◽  
Retention Index ◽  
Retention Indices ◽  
Chromatographic Retention ◽  
Retention Data ◽  
Chromatographic Property ◽  
Gas Chromatographic Retention Indices ◽  
Chromatographic Retention Indices ◽  
Relationship Of ◽  
Long Chain

Motivated by a recent identification of two homologous series of branched butanoates and pentanoates in S. pecten-veneris essential oil, with an apparently regular change of their retention index (RI) values, we decided to examine the generality of such structure-chromatographic property relationship. Based on the experimentally obtained retention data (RI values of in total 20 compounds) of hexyl, decyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, heneicosyl and tricosyl isobutanoates and 3-methylbutanoates and selected 2-methylbutanoates, a model was built up that correlates the total number of carbon atoms, Wiener (WI), Balaban (BI) and molecular topological (MTI) indices of the mentioned esters and their RI data (RI = 240.5 + 91.2 x C + 2.94 x WI + 4.6 x 10-5 x BI - 0.381 x MTI). The obtained equation represents a new and simple tool for the prediction of gas chromatographic (retention indices) data for esters of straight long-chain fatty alcohols and branched short aliphatic acids.

scholarly journals Chemical Composition of the Essential oil ofChromolaena odorata(L.) R. M. King & H. Rob. Roots from India

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Rajesh K. Joshi
Keyword(s):  
Gas Chromatography ◽  
Essential Oil ◽  
Essential Oil Composition ◽  
Chromolaena Odorata ◽  
Ionization Detector ◽  
Oil Composition ◽  
Flame Ionization ◽  
Sesquiterpene Hydrocarbons ◽  
Total Oil ◽  
Long Chain

The hydrodistilled essential oil of the roots ofChromolaena odorata(L.) R. M. King & H. Rob. was analysed by gas chromatography equipped with flame ionization detector (GC-FID) and gas chromatography coupled with mass spectrometry (GC/MS). A total of twenty-nine compounds have been identified, accounting 97.6% of the total oil. The main constituents were himachalol (24.2%), 7-isopropyl-1,4-dimethyl-2-azulenol (17.6%), androencecalinol (14.1%), and 2-methoxy-6-(1-methoxy-2-propenyl) naphthalene (5.6%). The essential oil consists mainly of phenyl derivatives (41.6%), followed by oxygenated sesquiterpenes ((26.6%), long-chain hydrocarbons (18.9%), sesquiterpene hydrocarbons (6.8%), oxygenated monoterpenes (2.8%), and monoterpene hydrocarbons (0.9%). This study revealed that the roots ofC. odorataproduced different chemotypes other than leaves oil. This is the first report on the essential oil composition of the roots ofC. odorata.

Synthesis of small libraries of natural products: New esters of long-chain alcohols from the essential oil ofScandix pecten-venerisL. (Apiaceae)

2014 ◽  
Vol 29 (4) ◽  
pp. 255-266 ◽  
Author(s):  
Niko S. Radulović ◽  
Marko Z. Mladenović ◽  
Zorica Z. Stojanović-Radić
Keyword(s):  
Natural Products ◽  
Essential Oil ◽  
Long Chain

scholarly journals A note on the biosynthesis of long-chain 3-methyl-2-alkanones from the root essential oil of Inula helenium L. (Asteraceae)

2015 ◽  
Vol 13 (2) ◽  
pp. 83-89
Author(s):  
Marija Gencic ◽  
Niko Radulovic
Keyword(s):  
Essential Oil ◽  
Enzyme System ◽  
Carbon Number ◽  
Plant Tissues ◽  
Biosynthetic Pathways ◽  
Methyl Group ◽  
Inula Helenium ◽  
Related Compounds ◽  
Root Essential Oil ◽  
Long Chain

A predominantly odd-numbered, Gaussian-like distribution of the relative amounts of 3-methyl-2-alkanones, from I. helenium root essential oil, was observed. This distribution pattern indicates that their biosynthesis is related to that of fatty acids and related compounds. Simple (non-branched) 2-alkanones also show an odd carbon number prevalence in plants and other organisms, and it was shown that their biosynthesis indeed proceeds via the acetate pathway. In this paper, we propose three possible biosynthetic pathways by which 3-methyl-2-alkanones could be formed in the plant tissues. The essential distinction between them lies in the way the branching methyl group is introduced. The Gaussian parameter ? for the observed distribution of these ketones could be interpreted as the error introduced by the first elongase enzyme system involved in the biosynthesis of fatty acid-derived compounds.

scholarly journals Volatolomics of Sardinian and Spanish Bituminaria: Characterization of Different Accessions Using Chemometrics

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5247
Author(s):  
Marianna Usai ◽  
Mauro Marchetti ◽  
Rita A.M. Melis ◽  
Claudio Porqueddu
Keyword(s):  
Salicylic Acid ◽  
Essential Oil ◽  
Methyl Linoleate ◽  
Great Variability ◽  
High Concentration ◽  
Fodder Production ◽  
Bituminaria Bituminosa ◽  
Oil Characterization ◽  
Long Chain

The present study aims to determine the volatile compositions of 15 different accessions of native Sardinian populations of Bituminaria morisiana (Pignatti & Metlesics) Greuter, Bituminaria bituminosa (L.) C. H. Stirt. (B. b.), and Spanish native accessions of B. bituminosa. Furthermore, we particularly focused on the essential oil characterization of these accessions and discriminated within populations with low furocoumarin content useful for fodder production in Mediterranean environments or furocoumarin extraction for pharmaceutical utilization. The plant extracts were analyzed by GC/MS, showing great variability in the content and composition. No differences were found in Bituminaria bituminosa (L.) C.H. Stirt. var. bituminosa essential oils, while the varieties Bituminaria bituminosa (L.) C.H. Stirt. var. crassiuscula P. Méndez, Fern. Galván & A. Santos and Bituminaria bituminosa (L.) C.H. Stirt. var. albomarginata P. Méndez, Fern. Galván & A. Santos are characterized by the presence of a high concentration of long-chain alcohols and of salicylic acid benzylic ester. In B. bituminosa var. albomarginata, we observed a different profile with predominance of a large concentration of alcohols as dodecanol and tetradecanol. The endemic B. morisiana can be identified for the predominant presence of farnesene. In methanolic fractions, we detected the presence of maltol, methyl citrate, methyl cumarate, santonin, and methyl linoleate. B. morisiana showed a low content of psoralens, and the accession of B. morisiana, from Siliqua indicated the presence of apocynin.

Polymer Morphology Revealed by Staining Techniques

1981 ◽  
Vol 39 ◽  
pp. 340-341
Author(s):  
A. C. Reimschuessel ◽  
V. Kramer
Keyword(s):  
Polymer Melt ◽  
Nylon 6 ◽  
Morphological Features ◽  
Negative Staining ◽  
Polymer Morphology ◽  
Crystallizable Polymer ◽  
Staining Techniques ◽  
Long Chain

Staining techniques can be used for either the identification of different polymers or for the differentiation of specific morphological domains within a given polymer. To reveal morphological features in nylon 6, we choose a technique based upon diffusion of the staining agent into accessible regions of the polymer.When a crystallizable polymer - such as nylon 6 - is cooled from the melt, lamellae form by chainfolding of the crystallizing long chain macromolecules. The regions between adjacent lamellae represent the less ordered amorphous domains into which stain can diffuse. In this process the lamellae will be “outlined” by the dense stain, giving rise to contrast comparable to that obtained by “negative” staining techniques.If the cooling of the polymer melt proceeds relatively slowly - as in molding operations - the lamellae are usually arranged in a radial manner. This morphology is referred to as spherulitic.

A theory of contamination in electron microscopes by surface diffusion

1978 ◽  
Vol 36 (1) ◽  
pp. 116-117
Author(s):  
J.T. Fourie
Keyword(s):  
Electron Beam ◽  
Surface Diffusion ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Physical Parameters ◽  
Carbon Compounds ◽  
Hydrocarbon Molecules ◽  
Electron Microscopes ◽  
Primary Electrons ◽  
Long Chain

Contamination in electron microscopes can be a serious problem in STEM or in situations where a number of high resolution micrographs are required of the same area in TEM. In modern instruments the environment around the specimen can be made free of the hydrocarbon molecules, which are responsible for contamination, by means of either ultra-high vacuum or cryo-pumping techniques. However, these techniques are not effective against hydrocarbon molecules adsorbed on the specimen surface before or during its introduction into the microscope. The present paper is concerned with a theory of how certain physical parameters can influence the surface diffusion of these adsorbed molecules into the electron beam where they are deposited in the form of long chain carbon compounds by interaction with the primary electrons.

Sign in / Sign up

Export Citation Format

Share Document