THE NORMAL C17 FATTY ACIDS OF MUSK-OX FAT

1957 ◽  
Vol 35 (12) ◽  
pp. 1434-1437 ◽  
Author(s):  
Mary J. Chisholm ◽  
C. Y. Hopkins
Keyword(s):  
Fatty Acids ◽  
Melting Point ◽  
Mixed Melting Point ◽  
Methyl Esters ◽  
Heptadecanoic Acid ◽  
X Ray Diffraction ◽  
Straight Chain ◽  
Trans Form ◽  
Total Fatty Acids ◽  
Musk Ox

A sample of body fat of the Canadian musk ox (Ovibosmoschatus subsp.) was converted to methyl esters and distilled. The fraction containing esters of C17 acids was crystallized fractionally at low temperature and two straight-chain C17 acids were isolated. n-Heptadecanoic acid was identified by analysis, by mixed melting point of the acid and two derivatives with authentic samples, and by its X-ray diffraction pattern. 9-Heptadecenoic acid was identified by analysis, by mixed melting point of two derivatives with authentic samples, and by oxidative cleavage. It is estimated that the fat contained 1.7% of n-heptadecanoic acid and 0.9% of cis-9-heptadecenoic acid, based on the total fatty acids. Although there was an appreciable content of trans acids in the fat, the heptadecenoic acid was found to contain little or none of the trans form.

scholarly journals Chemical, Nutritional and Antioxidant Characteristics of Different Food Seeds

2020 ◽  
Vol 10 (5) ◽  
pp. 1589 ◽  
Author(s):  
Lacrimioara Senila ◽  
Emilia Neag ◽  
Oana Cadar ◽  
Melinda Haydee Kovacs ◽  
Anca Becze ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Protein Content ◽  
Methyl Esters ◽  
Lipid Extraction ◽  
Omega 3 ◽  
Hemp Seed ◽  
Chromatography Analysis ◽  
Total Fatty Acids ◽  
Antioxidant Characteristics

The objective of this study was to determine the chemical composition of five different food seeds (sunflower, poppy, hemp, flax and sesame) regarding fatty acid, mineral (Fe, Cu, Zn, Na, Mg, K, Ca, Al) and protein content. In addition, the total antioxidant capacity of the seeds was evaluated using the photochemiluminescent assay. The food seeds were subjected to lipid extraction and converted into fatty acid methyl esters before the gas chromatography analysis. In all food seeds, the saturated (SFAs), monounsaturated (MUFAs) and polyunsaturated fatty acids (PUFAs) were identified, respectively. PUFAs were the most abundant fatty acids (61.2% ± 0.07% and 84.8% ± 0.08% of total fatty acids), with the highest content in flax and hemp seed oil. Also, high amounts of omega-3 from PUFAs were determined in flax and hempseed oil. Based on the obtained results the sunflower, sesame and poppy seeds are good sources of omega-6, while flax and hemp seeds are good sources of omega-3. All samples are rich in minerals (Na, K, Ca, Mg) and have more than 20% protein content.

Chloroplast Fatty Acid Composition in Mediterranean Populations of the Marine Chlorophyte, Anadyomene stellata

2000 ◽  
Vol 55 (7-8) ◽  
pp. 569-575 ◽  
Author(s):  
Debra L. Bemis ◽  
Vassilios Roussis ◽  
Constantinios Vagias ◽  
Robert S. Jacobs
Keyword(s):  
Fatty Acids ◽  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Florida Keys ◽  
Mediterranean Populations ◽  
Total Fatty Acids ◽  
Of Greece

Abstract Chloroplasts isolated from three populations of the tropical marine Chlorophyte Anadyomene stellata collected off the coast of Greece were analyzed for their fatty acid composition. Following the preparation of fatty acid methyl esters, GC-MS (El) was utilized to identify the fatty acids present in each population. Including isomers, the fatty acid profile of all three algal populations was comprised of 19 fatty acids (4 saturated, 6 monounsaturated, 9 polyunsaturated) with palmitic acid present in the highest amounts (25-27% of total fatty acids). Analysis of variance revealed significant differences amongst the three populations in the percent of total fatty acids for twelve of the fatty acids. High levels of C20 PUFAs, an atypical observation in Chlorophytes, were observed in all three populations comprising approximately 17% of total fatty acids. Furthermore a 14:2 PUFA , apparently rare in marine macrophytic Chlorophytes, was identified in significant quantities. Surprisingly, we did not find any of the conjugated tetraene containing fatty acids that we previously identified in the A. stellata populations studied from the Florida Keys.

Identification of fatty acids from butterfat using a combined gas chromatograph-mass spectrometer

1967 ◽  
Vol 34 (2) ◽  
pp. 115-121 ◽  
Author(s):  
Ragnar Ryhage
Keyword(s):  
Fatty Acids ◽  
Mass Spectrometer ◽  
Methyl Esters ◽  
Acid Methyl Ester ◽  
Straight Chain ◽  
Molecular Weights ◽  
Acid Methyl ◽  
Branched Chain ◽  
Chain Lengths

SummaryThe identification and approximate quantitative determination of methyl esters of fatty acids from commercial butterfat was obtained with a combined gaschromatograph-mass spectrometer instrument. Fifty-two components, straight chain saturated and unsaturated, as well as branched chain compounds, were identified. Seven monomethyl saturated fatty acid methyl ester isomers were identified for both C15 and C17, i.e. with chain lengths of 14 and 16 carbon atoms, respectively. Multibranched fatty acids with molecular weights of 326 and 368 were found. The results were obtained in one day.

scholarly journals Precambrian organic compounds from the Ketilidian of South-West Greenland. Part III

1970 ◽  
Vol 82 ◽  
pp. 1-42
Author(s):  
K.R Pedersen ◽  
J Lam
Keyword(s):  
Fatty Acids ◽  
Organic Compounds ◽  
Homologous Series ◽  
Mass Spectra ◽  
Methyl Esters ◽  
Graphite Layer ◽  
Straight Chain ◽  
Normal Alkanes ◽  
Cyclic Hydrocarbons ◽  
Alkyl Benzenes

Ketilidian sedimentary rocks nearly 2000 m.y. old and only slightly metamorphosed have been shown to contain fossils and organic compounds. Results of work on organic material from a 1-3 m thick coal-graphite layer from the Foselv Formation in the Sortis Group in Grænseland are presented. Aliphatic (straight chain, branched and cyclic) hydrocarbons are dominant in the extract from two coal-graphite samples weighing about 4 kg and 10 kg respectively. Further investigations of these compounds have revealed many saturated straight-chain hydrocarbons, with the n-C15 alkane, the most abundant among the normal alkanes, ranging from C12 to about C21, and various isoalkanes and anteisoalkanes. Saturated cyclic hydrocarbons like alkyl cyclohexanes, and homologous series of alkyl benzenes and alkyl naphthalenes are also present. A series of monoterpenoid compounds is present. Six of them are fairly well characterized by their mass spectra. Fatty acids and methyl esters of fatty acids are present, notably a homologous series of straight-chain fatty acids. Branched acids are also present in minor amounts. The organic compounds further indicate that this Precambrian coal-graphite layer is the result of biological activity.

scholarly journals Analysis Fatty Acids Profile in Tabanus bivittatus Mats with Gas Chromatography-Mass Spectrometry

2015 ◽  
Vol 9 (1) ◽  
pp. 113-118
Author(s):  
Wang Yanhua ◽  
Wu Fuhua ◽  
Guo Zhaohan ◽  
Peng Mingxing ◽  
Xia Min ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Palmitoleic Acid ◽  
Unsaturated Fatty Acids ◽  
Methyl Esters ◽  
Soxhlet Extraction ◽  
Gas Chromatography Mass Spectrometry ◽  
Chemical Components ◽  
Fatty Acids Profile ◽  
Total Fatty Acids

Tabanus bivittatus Mats., a traditional Chinese medicine, is commonly used for cardiovascular disorders treatment including atherosclerosis. There have been only a few researches on its chemical components, and no detailed report has appeared on its fatty acids. To develop a simple and effective method for the extraction of total fatty acids from Tabanus bivittatus Mats., the Soxhlet extraction (SE) condition was optimized with response surface methodology. The fatty acid composition of the extract were determined by GC-MS with previous derivatization to fatty acid methyl esters (FAMEs). The major fatty acids in Tabanus bivittatus Mats. were oleic acid, palmitic acid, linoleic acid, palmitoleic acid, and stearic acid, and the unsaturated fatty acids occupy 63.9% of the total fatty acids.

THE EFFECTS OF CHAIN LENGTH ON THE INFRARED SPECTRA OF FATTY ACIDS AND METHYL ESTERS

1962 ◽  
Vol 40 (2) ◽  
pp. 321-333 ◽  
Author(s):  
R. Norman Jones
Keyword(s):  
Fatty Acids ◽  
Carbon Tetrachloride ◽  
Chain Length ◽  
Infrared Spectra ◽  
Comparative Studies ◽  
Carbon Disulphide ◽  
Methyl Esters ◽  
Straight Chain ◽  
Group Frequency ◽  
Chain Fatty Acids

The infrared spectra of straight-chain fatty acids and their methyl esters have been measured over the range 1500–650 cm−1 in carbon tetrachloride and carbon disulphide solution. The effects of the chain length on the peak intensities of the bands have been analyzed in relation to the group frequency assignments derived from comparative studies of deuterium-substituted methyl laurates.

The Heptacarboxylic Porphyrin of Various Types of Porphyria and the Melting-Point Curve of Methyl Esters of the I and III Isomers

1966 ◽  
Vol 12 (10) ◽  
pp. 647-658 ◽  
Author(s):  
T C Chu ◽  
Edith Ju-Hwa Chu
Keyword(s):  
Melting Point ◽  
South African ◽  
Porphyria Cutanea Tarda ◽  
Methyl Esters ◽  
Acute Intermittent Porphyria ◽  
Type I ◽  
X Ray Diffraction ◽  
Different Types ◽  
Composition Curve ◽  
Point Composition

Abstract The heptacarboxylic porphyrin (hepta) isolated from different types of porphyric urine samples contains different proportions of the isomers I and III. These were separated chromatographically. The hepta in congenital porphyria was found to contain 65% of Type I isomer and 35% of Type III; that in acute intermittent porphyria, 70-80% III and 20-30% I; and that in porphyria cutanea tarda, 80-90% III. Several other cases including 1 of coproporphyria, 1 of South African genetic porphyria, 1 of Bantu porphyria, 4 of hexachlorobenzene poisoning in Turkish individuals were also examined. From the X-ray diffraction pattern and long-column chromatography, the Hepta III prepared either from decarboxylation of Uroporphyrin III or by condensation of porphobilinogen revealed a more complex configuration than that isolated from porphyric materials. The natural hepta might be dominated by one of the four possible isomers of the III series. A melting-point composition curve of methyl esters of Hepta I and III was constructed, and its applicability was tested. The identity of the hepta isolated in porphyria cutanea tarda with "208" and "pseudouro" porphyrins is discussed, and the name "cutano-porphyrin" suggested.

QUANTITATIVE ANALYSIS OF FATTY ACIDS IN VULCANIZED STYRENE–BUTADIENE RUBBER BY THERMAL DESORPTION AND THERMALLY ASSISTED HYDROLYSIS AND METHYLATION-GC/MS

2014 ◽  
Vol 87 (3) ◽  
pp. 516-525 ◽  
Author(s):  
Atsushi Watanabe ◽  
Chu Watanabe ◽  
Robert Freeman ◽  
Mari Nakajima ◽  
Norio Teramae ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Thermal Desorption ◽  
Methyl Esters ◽  
Analytical Data ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Relative Standard ◽  
Total Fatty Acids ◽  
Styrene Butadiene

ABSTRACT Determination of stearic acid in rubber is very important from the viewpoint of quality control of products. In place of the conventional liquid-phase extraction procedures for the analysis of additives in rubber, stearic and palmitic acids in vulcanized styrene–butadiene rubber (SBR) samples were directly analyzed in the solid state by thermal desorption (TD)–gas chromatography (GC)/mass spectrometry (MS) and thermally assisted hydrolysis and methylation (THM)–GC/MS. It was found that the precision of analytical data was only fair in the TD-GC/MS analysis, with 7.8% relative standard deviation (RSD), because of the interaction between the polar fatty acids and basic sites in the GC chromatographic system. On the other hand, THM-GC/MS, in which the fatty acids are derivatized to the methyl esters using tetramethylammonium hydroxide, can overcome this problem. Under the optimized measurement conditions of this study for THM-GC/MS, the average determined value (0.62 wt%) of total fatty acids in the SBR samples was found to agree well with the compounded amount (0.64 wt%) used in the preparation stage of the SBR samples, and the RSD was 3.2%.

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