Reaction of Methyl Esters of Fatty Acids of Linseed Oil on Autoxidation and Heating

Experiments were conducted to determine the effect of triglycerides, free fatty acids (FFA), and fatty acid methyl esters (FAME) on the foliar absorption, translocation, and phytotoxicity of quizalofop. Absorption, translocation, and phytotoxicity of quizalofop in oats were greater when quizalofop was applied with FFA or FAME than with their respective triglycerides. Triglycerides and FFA generally enhanced quizalofop absorption and translocation more when they contained unsaturated than saturated fatty acids. Methylation of the fatty acids reduced differences among fatty acids, but methyl stearate and methyl linolenate enhanced absorption of quizalofop less than the other FAME for oats and yellow foxtail. Quizalofop absorption and phytotoxicity to oats were greater when applied with sunflower oil, sunflower oil FFA, and sunflower oil FAME than with the corresponding linseed oil derivatives. Emulsifier generally reduced differences between linseed oil and sunflower oil derivatives in their enhancement of absorption, translocation, and phytotoxicity of quizalofop.

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THE SIGNIFICANCE OF AN ABSORPTION BAND AT 968 CM.−1 IN THE INFRARED SPECTRUM OF METHYL ISOLINOLEATE

Canadian Journal of Research ◽

10.1139/cjr49b-060 ◽

1949 ◽

Vol 27b (7) ◽

pp. 610-615 ◽

Cited By ~ 17

Author(s):

H. W. Lemon ◽

C. K. Cross

Keyword(s):

Fatty Acids ◽

Absorption Spectrum ◽

Double Bond ◽

Absorption Band ◽

Linseed Oil ◽

Infrared Absorption Spectrum ◽

Methyl Esters ◽

Trans Configuration ◽

Double Bonds ◽

Identical Band

The infrared absorption spectrum of methyl isolinoleate, separated from the methyl esters of hydrogenated linseed oil fatty acids, has a well defined absorption band with maximum absorption at about 968 cm.−1 As an identical band was found in the spectra of fatty acids or esters after isomerization with selenium, it is attributed to the presence of double bonds with a trans-configuration. It was found that the same band was present in the spectra of samples taken during hydrogenation of oils, and that its intensity increased to a maximum, then decreased as hydrogenation proceeded. It is concluded that hydrogenation is accompanied by a cis-to-trans change in some of the double bonds of the fatty acids, and that methyl isolinoleate has at least one double bond with a trans-configuration.

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Analysis of styrenated methyl esters of linseed oil fatty acids by molecular distillation

Analytica Chimica Acta ◽

10.1016/0003-2670(56)80153-0 ◽

1956 ◽

Vol 14 ◽

pp. 228-234 ◽

Cited By ~ 2

Author(s):

Sie Swan Tiong ◽

H.I. Waterman ◽

C. Boelhouwer

Keyword(s):

Fatty Acids ◽

Molecular Distillation ◽

Linseed Oil ◽

Methyl Esters

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Genetic resources of flax (Linum usitatissimum L.) as very rich source of α-linolenic acid

Herba Polonica ◽

10.1515/hepo-2017-0022 ◽

2017 ◽

Vol 63 (4) ◽

pp. 26-33 ◽

Cited By ~ 2

Author(s):

Grażyna Silska

Keyword(s):

Fatty Acids ◽

Linolenic Acid ◽

Linum Usitatissimum ◽

Linseed Oil ◽

Methyl Esters ◽

Fat Content ◽

Infrared Analysis ◽

Fatty Acids Composition ◽

Linum Usitatissimum L ◽

Acid Ratio

Summary Introduction: Polish oilseed and flaxseed collection is a source of genotypes containing very high amounts of α-linolenic acid. Objective: The objective of the study is to test the seeds for the fat content and fatty acids composition in the oil pressed from the 9 tested accessions of flax (Linum usitatissimum L.). Our goal is to promote the Polish flax collection, which seeds are unique as one of the richest sources of α-linolenic acid. Methods: Assays to determine the content of fat and fatty acids composition in linseed oil were performed at the IHAR-PIB Biochemical Laboratory in Poznań. The fat content was determined by infrared analysis (calibration performed on the basis of seed sample at IHAR-PIB in Poznań) by means of a NIRS 6500 spectrophotometer with a reflection detector within the range of 400-2500 nm. The composition of fatty acids was determined by means of a method proposed by Byczyńska and Krzymański (1969), based on gas chromatography of methyl esters of fatty acids contained in linseed oil. The following varieties of flax were investigated: Tabare (INF00111), Szegedi 30 (INF00427), Olin (INF 00444), Redwood 65 (INF00523), Dufferin (INF00540), AC Mc Duff (INF00648), Alfonso Inta (INF00683), Olinette (INF00687), Royale (INF00689). Results: The content of α-linolenic acid (ALA, C18:3) in evaluated genotypes of flax ranged from 48.9 (Royale) to 59.9% (Alfonso Inta). Content of linoleic acid (LA, C18:2) in evaluated genotypes of flax ranged from 12.4 (Tabare) to 17.1% (AC Mc Duff). The content of oleic acid (OA, C18:1) of 9 accession of flax ranged from 17.1 (Alfonso Inta) to 26.7% (Royale). The content of stearic acid in evaluated genotypes of flax ranged from 2.3 (Alfonso Inta) to 5.0% (Tabare, Szegedi 30) and the content of palmitic acid ranged from 4.7 (Dufferin) to 6.0% (Olin). The content of fat ranged from 42.7 (Olin) to 52.0% (AC Mc Duff). The fatty acid ratio n-6/n-3 ranged from 0.23/1 (Tabare) to 0.32/1 (AC Mc Duff).

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