scholarly journals Comparison of analytical techniques for the determination of the positional distribution of fatty acids in triacylglycerols. Relationship with pig fat melting point and hardness

2015 ◽  
Vol 66 (2) ◽  
pp. e076 ◽  
Author(s):  
N. Ruiz-López ◽  
J. Segura ◽  
D. Menoyo ◽  
M. I. Cambero ◽  
C. J. López-Bote
Keyword(s):  
Fatty Acids ◽  
Melting Point ◽  
Positional Distribution ◽  
Analytical Techniques

Determination of the positional distribution of fatty acids in butterfat triacylglycerols

1993 ◽  
Vol 70 (2) ◽  
pp. 169-173 ◽  
Author(s):  
S. Kermasha ◽  
S. Kubow ◽  
M. Safari ◽  
A. Reid
Keyword(s):  
Fatty Acids ◽  
Positional Distribution

scholarly journals Comparison of Different Methods of Extraction for Pomegranate Seeds

Proceedings ◽  
2020 ◽  
Vol 70 (1) ◽  
pp. 91
Author(s):  
Joanna Bryś ◽  
Marko Obranović ◽  
Maja Repajić ◽  
Klara Kraljić ◽  
Dubravka Škevin ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Biological Effects ◽  
Methyl Esters ◽  
Positional Distribution ◽  
Soxhlet Extraction ◽  
Punicic Acid ◽  
Soxhlet Method ◽  
Pomegranate Seeds

Pomegranate seed oil (PSO) has attracted considerable attention because of its potentially beneficial biological effects. This oil consists of a high content of polyunsaturated fatty acids, mainly conjugated type, punicic acid. Punicic acid has antioxidant and anticancer activity. The aim of this research was to compare the properties of PSO obtained by cold extraction, Soxhlet extraction and Accelerated Solvent Extraction (ASE). The oxidative stability of oils from pomegranate was determined by using the calorimetric method. The determination of fatty acid composition was carried out by gas chromatographic analysis of fatty acid methyl esters. The positional distribution of fatty acids in the sn-2 and sn-1,3 positions of triacylglycerols (TAG) was based on the ability of the pancreatic lipase to selectively hydrolyze ester bonds in the sn-1,3 positions. Sterols composition was determined with GC-MS. The greatest amount of oil can be obtained using the Soxhlet method (12–15%) and the least by using the ASE method (10–11%), but the ASE oil is more diverse in terms of sterol content. All the extracted oils were rich in punicic acid (about 80%). In the external positions of TAG there is mainly punicic acid, while in the internal positions there are oleic and linoleic acids.

Labelling Experiments on the Origin of Hexa-and Octa- decatrienoic Acids in Galactolipids from Leaves

1977 ◽  
Vol 32 (3-4) ◽  
pp. 193-205 ◽  
Author(s):  
H. P. Siebertz ◽  
E. Heinz
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Unsaturated Fatty Acids ◽  
Positional Distribution ◽  
Hydrolysis Products ◽  
Young Leaves ◽  
Fatty Acid Patterns ◽  
Monogalactosyl Diglyceride ◽  
Hexadecatrienoic Acid

Abstract Young leaves from three plants which accumulate hexadecatrienoic acid rather specifically in the sn-2-position of monogalactosyl diglyceride (MGD) were incubated with radioactive CO2 or acetate to investigate the origin of this specificity. Labelled glycerolipids were extracted and analyzed for time-dependent changes of radioactivity in their fatty acids. The investigation of labelled MGD and digalactosyl diglyceride (DGD) included determination of radioactivity in hydrolysis products, separation of molecular species by argentation chromatography and analysis of the positional distribution of fatty acids. The results agree with previous observations on the accumulation of radioactive oleic acid in phosphatidyl choline (PC) and formally with the possibility of a PC-coupled desaturation to linoleic acid. They do not support the proposed function of PC as donator of polyenoic acids. Instead the radioactivity patterns may be interpreted as pointing to a relation between fatty acid desaturation and many if not all glycerolipids, although a different interpretation is also possible. Fatty acid patterns in lipids and their labelling indicate the existence of several pools for 1) MGD, from which only that without C16-unsaturated fatty acids is accessible for galactosylation to DGD ; 2) palmitic acid, from which one part is accessible to desaturation via C16:0 and C16:2 to C16:3 . Since these acids are found labelled in the sn-2-position of MGD, the specific positioning may be related to this separation of C16:0pools. Desaturation of C16:0 seems to be the major source of C16:3; 3) linolenic acid, from which those parts present in the sn-2-position of galactolipids or in PC are characterized by a strikingly slow labelling.

scholarly journals Comparison of Thermal Characteristics and Fatty Acids Composition in Raw and Roasted Cocoa Beans from Peru (Criollo) and Ecuador (Forastero)

2021 ◽  
Vol 11 (6) ◽  
pp. 2698
Author(s):  
Ewa Ostrowska-Ligęza ◽  
Karolina Dolatowska-Żebrowska ◽  
Magdalena Wirkowska-Wojdyła ◽  
Joanna Bryś ◽  
Agata Górska
Keyword(s):  
Fatty Acids ◽  
Cocoa Butter ◽  
Positional Distribution ◽  
Thermal Characteristics ◽  
Proximate Analysis ◽  
Fatty Acids Composition ◽  
Cocoa Beans ◽  
Kinetic Information ◽  
Melting Characteristics

The aim of this research was to complete the characteristics of cocoa beans and cocoa butter extracted from two different Theobroma cacao species: Criollo originated from Peru and Forastero originated from Ecuador, both in the version of raw (unroasted) and roasted beans. Before extraction, the cocoa beans were characterized by proximate analysis. The determination of fatty acids composition was carried out by gas chromatography (GC). The positional distribution of fatty acids in the sn-2 positions of triacylglycerols (TAGs) was also determined. The thermogravimetric analyses (TGA/DTG) were performed under the nitrogen and oxygen atmosphere of roasted and unroasted cocoa beans. The kinetic information was helpful to assess the oxidative stability of cocoa butter. The cocoa butter extracted from unroasted Forastero from Ecuador had the highest values of oxidation activation energy Ea. The melting characteristics of cocoa butter extracted from roasted Criollo species were very similar to their unroasted versions. The same trend was not observed for Forastero species. TGA and DTG were revealed to be useful tools for the analysis of whole cocoa beans and the fats extracted from these cocoa beans.

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