Comparison of techniques for the extraction of tobacco seed oil

Abstract

The yield and fatty acid (FA) composition of the oil obtained from the seeds of a semi-oriental tobacco (Nicotiana tabacum L.) plant, type Otlja, by various recovery techniques, which are: Soxhlet extraction (SE), maceration (ME), indirect and direct ultrasonic extraction (IUE and DUE, respectively) and cold pressing (CP), were compared. The solvent extractions of ground tobacco seeds (TS) were carried out by n-hexane, while CP was used to recover the oil from the TS. The highest oil yield (32.9 g/100 g, i.e. 93% of the oil content in the seeds) was achieved by CP. Ultrasonically assisted solvent extractions appear to be inefficient in recovering the oil from the ground TS, as the oil yields were only 45-55% of the oil content, depending on the extraction conditions. Independently of the technique applied, linoleic acid was the major FA of the tobacco seed oil (TSO). The compositions of the TSO extracted by SE, ME, IUE and CP were very similar to each other, and the composition of the TSO recovered by DUE depended on the ultrasonic power input. The content of linoleic acid was reduced, while the content of saturated FA was increased by increasing the ultrasonic power from 5 to 50 W.

Mechanical oil extraction of Nicotiana tabacum L. seeds: analysis of main extraction parameters on oil yield

“…(Cappella et al, 1997;Singh and Bargale, 2000;Uquiche et al, 2008;Stanisavljevic et al, 2009;Bordoni et al, 2010).…”

“…The constant temperature for the Setup 2 was 70°C and the same combinations between pre-treatment and speed of screw of Setup 1 were applied. For each sample, 1000 g (Stanisavljevic et al, 2009) of seeds were used and six replications were done (Unquiche et al, 2008). Before each extraction there was a preparatory phase during which the press was cleaned, the temperature of the press head has been set with an electrical resistance (Ferchau, 2000;Beerens, 2007;Karaj and Muller, 2011) and the speed of screw was regulated.…”

“…The low proportion of saturated FA is a positive factor to consider TSO as nutritionally appropriate, compared to vegetable oils with a high concentration of saturated fat. Moreover, the tobacco seeds (TS) by-product in oil extraction (TS cake) has a high concentration of nitrogen as amino acids (15.6%) making it usable at up to about 25% of the ratio into concentrate mixtures for dairy cattle feed (Stanisavljevic et al, 2009). The possible use of seed cake and stalks should also be taken into account, in the economic evolution of production from tobacco.…”

“…Among all the extraction techniques, seed pressing seems to be more acceptable than the other methods for economic, environmental, health and safety reasons. Using this technique, Stanisavljevic et al (2009) achieved an oil yield of 32.9/100 g. The aim of this study is to investigate and find the best combination of extraction factors, such as extraction temperature, seeds preheating and screw speed rotation, in order to have a higher oil yield.…”

The biodiesel production from the cotton thistle seed oil (Onopordum acanthium L.)

“…Očigledno je da nakon hladnog presovanja semena, deo ulja zaostaje u pogači. Sa druge strane, hladno presovanje je prihvatljivija tehnika izdvajanja ulja od ekstrakcije rastvaračem iz ekonomskih, ekoloških, zdravstvenih i bezbednosnih razloga [30]. Pored toga, prinos ulja iz semena O. acanthium L. može biti povećan kombinovanjem tehnike hladnog presovanja i ekstrakcije rastvaračem.…”