Solid phase extraction: Applications to the chromatographic analysis of vegetable oils and fats

Panagiotopoulou, Paraskevi; Tsimidou, Maria Z.

doi:10.3989/gya.2002.v53.i1.292

Cited by 3 publications

(2 citation statements)

References 94 publications

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“…Sterols in olive and olive oil occur in free and bound form, esterified to fatty or phenolic acids, or bound to sugar molecules into glycosides that may or may not be acylated. Information on the proportions of free sterols and steryl esters is lost by conventional sterol analysis, as it involves saponification in the early phase of sample preparation [91]. It has been shown that there is a possibility that information on the proportion and amounts of sterols in free and bound form may be useful for several purposes.…”

Section: Methods Of Analysis Of Sterols and Triterpene Diolsmentioning

confidence: 99%

Sterols and Triterpene Diols in Virgin Olive Oil: A Comprehensive Review on Their Properties and Significance, with a Special Emphasis on the Influence of Variety and Ripening Degree

2021

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Olive oil is considered one of the most valuable vegetable oils and is highly appreciated by consumers for its specific and distinguishable taste and aroma, as well as its nutritional value. Sterols and triterpene diols are important carriers of bioactive properties of olive oil and are responsible for some of the beneficial effects of its consumption on human health, such as lowering serum LDL-cholesterol levels and significantly reducing the risk of cardiovascular diseases. The concentration of total sterols and the proportions of particular sterols and triterpene diols are among the parameters used to verify and prove the authenticity of olive oil in accordance with the EU and other countries’ regulations. Finally, their composition has been shown to have high discrimination potential for ensuring traceability with respect to variety, geographical origin, harvest date, and other factors. For these reasons, the research on sterols and triterpene diols in olive oil is an ever-growing field of scientific interest with great practical importance. This review focuses on all the important aspects of sterols and triterpene diols in olive oil, from their chemical structure, biosynthesis, occurrence and role in plants, health benefits, and their use in official controls of olive oil purity and authenticity, to a conclusive survey on the recent findings about the effects of different factors of influence on their content and composition, with a detailed comparative analysis of studies that investigated the effects of the two most important factors, variety and ripening degree.

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Section: Methods Of Analysis Of Sterols and Triterpene Diolsmentioning

confidence: 99%

Sterols and Triterpene Diols in Virgin Olive Oil: A Comprehensive Review on Their Properties and Significance, with a Special Emphasis on the Influence of Variety and Ripening Degree

2021

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“…But the Magnesol ® used in the purification of biodiesel from the frying oil, it can be reused with good efficiency, since the amounts of glycerol found in biodiesel A2.1 (5.03%) and A2.2 (2.7%) are within the values recommended by the legislation, showing a decrease in the amount of glycerol when compared to unpurified biodiesel (A2 -6.41%). Probably, this decrease in glycerol observed in biodiesel after purification with recovered Magnesol ® is due to the characteristics of the remaining compounds in the THF-purified Magnesol, because it is demonstrated in the literature that residual compounds with polar and nonpolar characteristics found in residues of the biodiesel and remaining in the Magnesol have greater affinity with glycerol, aiding in the purification of the biodiesel (Panagiotopoulou and Tsimidou, 2002;Wretensjo and Karlberg, 2002).…”

Section: ) Glycerol Amountmentioning

confidence: 99%

Reuse of Magnesol® for Purification of Biodiesel

Coelho

Nogueira

Martins

et al. 2022

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Purification of biodiesel with dry adsorbents is an alternative method, as it uses compounds that eliminate the need for water in the process without generating liquid effluent. Currently, there is little discussion about the reuse of different types of adsorbents and in this context, the present work presents an efficient method of purification and investigates the performance of the reuse of Magnesol® in the purification of biodiesel in order to generate less waste to the environment. Therefore, the Magnesol® used was washed with several solvents with different polarity characteristics. Among the solvents tested, THF is the best solvent for the purification of Magnesol® and, after optimizing the Magnesol® purification process, it was concluded the best conditions are three washes in solvent / adsorbent ratio 30:1 at room temperature, resulting in only 3.89% of the residual value of contaminants and being an alternative for biodiesel companies.

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