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Gasparoli A.,Stazione Sperimentale per le Industrie degli Oli e dei Grassi | Gaboardi M.E.,Stazione Sperimentale per le Industrie degli Oli e dei Grassi
Rivista Italiana delle Sostanze Grasse | Year: 2011

Following the information collected in a previous study, we continued the investigation of other fractions detected in the unsaponifiable lipid hydrogenated. Samples are analyzed for trade in tallow, palm, coconut, hydrogenated rapeseed. The separation by thin-layer chromatography of unsaponifiable samples highlights the presence of some bands that are analyzed by gas chromatography-mass spectrometry. They thus identified fragmentation due to stanols that migrate with different R f on the TLC plate. This behavior is confirmed by analyzing two standard reference 5α cholestan 3β ol and 5β cholestan 3α ol. It is assumed that such behavior is determined by the hydrogen introduced in the hydrogenation process. It also sets out that only by carrying out the analysis of sterol fraction R f do not have a complete picture, both qualitatively and quantitatively, of sterols actually present in the samples. Source


Mariani C.,Stazione Sperimentale per le Industrie degli Oli e dei Grassi | Bondioli P.,Stazione Sperimentale per le Industrie degli Oli e dei Grassi
Rivista Italiana delle Sostanze Grasse | Year: 2010

Biodiesel is a renewable fuel that can be prepared from natural oils both from vegetable and animal origin by means of a transesterification reaction with methanol. During these few last years several problems arisen during the biodiesel storage, because of the formation of solid impurities. Numerous studies demonstrated that said solid products are based on different molecules, such as saturated monoglycerides, waxes, citric acid and its salts, steryl glucosides. During the gaschromatographic evaluation of steryl glucosides the presence of peaks having retention times close to the one of free sterols was observed. These compounds were identified in this paper as hydroxysterols having the -OH moiety located in position 6 of b ring. Source


Butinar B.,University of Primorska | Bucar-Miklavcic M.,University of Primorska | Bucar-Miklavcic M.,LABs Inc. | Mariani C.,Stazione Sperimentale per le Industrie degli Oli e dei Grassi | Raspor P.,University of Ljubljana
Food Chemistry | Year: 2011

The Štajerska region in north-eastern Slovenia and the Styria region in southern Austria have a long tradition of growing pumpkins (Cucurbita pepo L.) as an oil crop. GC-MS determination of the free and esterified minor compounds in oil of roasted pumpkin seeds from the Slovenian C. pepo L. variety 'Slovenska golica' revealed the presence of two previously unreported compounds: alpha-tocomonoenol and gamma-tocomonoenol. Using the GC-MS data, reference samples (Crude Palm Oil) and tocopherol and tocotrienol standards it was possible to assign and quantify alpha-tocomonoenol (17.6 ± 0.6 μg/g) and gamma-tocomonoenol (118.7 ± 1.0 μg/g) compounds in roasted 'S. golica' seed oil using HPLC. The concentrations of alpha-tocopherol and gamma-tocopherol were 77.9 ± 1.9 μg/g and 586.0 ± 4.6 μg/g, respectively. Surprisingly the gamma-tocotrienol concentration found was only 6.9 ± 0.2 μg/g. Analysis of the seeds from which the oil was pressed showed the initial gamma-tocotrienol amount was even lower (1.6 ± 0.1 and 2.2 ± 0.1 μg/g in the ground and roasted seeds, respectively) than in the roasted seed oil. © 2011 Elsevier Ltd. All rights reserved. Source


Gasparoli A.,Stazione Sperimentale per le Industrie degli Oli e dei Grassi | Gaboardi M.E.,Stazione Sperimentale per le Industrie degli Oli e dei Grassi | Mariani C.,Stazione Sperimentale per le Industrie degli Oli e dei Grassi
Rivista Italiana delle Sostanze Grasse | Year: 2010

Unlike other oils, jojoba oil is made up of esters of fatty alcohols with fatty acids, not with triglycerides. Jojoba oil is greatly used in cosmqics for this specific composition, and it has a higher commercial value than other oils, thus it is mixed with less valuable oils having esters obtained by synthesis. In this work jojoba oil was subjected to hydrogenation in order to identify any foreign compounds, and followed by mass gas-chromatographic spectroscopy, hydrogenation was carried out by the saturation of the 2 double links present in the esters which contain them. By using mass spectroscopy of the fractions resulting from the gas-chromatographic analysis, specific spectres were clearly identified, mainly since each group of esters can be of many compounds together. Source


Rovellini P.,Stazione Sperimentale per le Industrie degli Oli e dei Grassi | Venturini S.,Stazione Sperimentale per le Industrie degli Oli e dei Grassi | Fusari P.,Stazione Sperimentale per le Industrie degli Oli e dei Grassi | Bulgari O.,Stazione Sperimentale per le Industrie degli Oli e dei Grassi | And 2 more authors.
Rivista Italiana delle Sostanze Grasse | Year: 2011

The payment of milk quality is still based in Italy on the legal requirements rather than on parameters related to the needs of processing technologies and dairy product quality. Management models based on technological and nutritional characteristics of milk are increasingly needed. The present work evaluated fatty acid (FA) contents and carbonylic volatile compounds (CVC) in cow's bulk milks produced in different herds of Brescia province (Italy). Milk samples were classified as "conventional" (CONV) or "high quality" (HQ) milks on the basis of protein and fat content, total bacteria and somatic cell count. The samples were successfully analysed employing two new high-performance liquid chromatography analytical methods, after a fat microextraction from milk. Significant differences were found for some parameters between the two milk typologies. In particular: C4:0, C5:1, C10:1, C20:1, and conjugated linoleic acids (CLA) were significantly higher in CONV milk, while C18:0, C20:0, C18:4 ω-3, C20:5 trienic, C18:3 dienic and C18:1 trans were significantly higher in HQ milk. As for CVC, significantly higher contents of C6:1, C7:0, C11:1, C10:0 and C11:0 were found in HQ milks. Several significant correlations were found between FA and CVC. A positive correlation was found between CLA and C10:1 CVC. The same CVC was negatively correlated with C18:3 and C18:4. In conclusion, these preliminary results focus on the real possibility to take into account FA and CVC biomarkers in addition to legal requirements for the qualification of milk as a function of its final destination. Source

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