tobacco (nicotiana tabacum l.) is an important industrial crop and its seeds contain significant amounts of oil. the extraction of oil components using solvent at high pressure, or supercritical fluid (scf), has received much attention. in the present study, statistical analyses showed that the average extraction yield of seed oil of five tobacco varieties using sfe was 9.33%, which was higher ...

In the last years the supercritical fluid extraction has been frequently used to obtain volatile oils from aromatic plants. In this work we have applied this technique to a different vegetable matrix: poplar (Populus nigra and MC) buds as it is known that they contain antioxidant compounds. The results of the supercritical extraction have been compared with those of the conventional soxhlet ext...

ganic trace analysis. Pure Applied Chemistry 55: 1943. FiReld FW and Haines PJ (1995) Environmental Analytical Chemistry. London: Chapman and Hall. Luque de CastroMD andDa Silva MP (1997) Strategies for solid sample pretreatment. Trends in Analytical Chemistry 16: 16. Luque de Castro MD and Garcia-Ayuso LE (1998) Soxhlet extraction of solid materials: an outdated techniquewith a promising innov...

Triterpene compounds like betulin, betulinic acid, erythrodiol, oleanolic acid and lupeol are known for many pharmacological effects. All these substances are found in the outer bark of birch. Apart from its pharmacological effects, birch bark extract can be used to stabilise semisolid systems. Normally, birch bark extract is produced for this purpose by extraction with organic solvents. Employ...

The objective of the present work is to extract lovastatin with minimum impurity by using supercritical carbon dioxide (SC-CO2). A strain of Aspergillus terreus UV 1617 was used to produce lovastatin by solid-state fermentation (SSF) on wheat bran as a solid substrate. Extraction of lovastatin and its hydroxy acid form was initially carried out using organic solvents. Among the different screen...

Supercritical fluid extraction (SFE), which has received much interest in its use and further development for industrial applications, is a method that offers some advantages over conventional methods, especially for the palm oil industry. SC-CO₂ refers to supercritical fluid extraction (SFE) that uses carbon dioxide (CO₂) as a solvent which is a nontoxic, inexpensive, nonflammable, and nonpoll...

The multiresistance of bacteria to antibiotics, as well as the lack of new antibiotics on the market encouraged the reasearch of antibacterial activity of non-antibiotic substances including plant extracts. During the previous decades, it has been proven that extracts of certain plants have a strong antibacterial activity, but their clinical use was limited due to the presence of organic solven...

The seed lipid of Nitraria tangutorum was extracted by supercritical carbon dioxide extraction, microwaveassisted reflux extraction, ultrasound-assisted extraction, or solvent reflux extraction. The experimental parameters of supercritical carbon dioxide extraction including pressure, temperature, particle size, and extraction time were investigated. A facile and sensitive method for the simult...

A response surface methodology was applied to optimize the variables affecting the supercritical fluid carbon dioxide extraction of oil from the fruit of Gardenia jasminoides using the Box-Behnken design. The optimum extraction parameters were an extraction temperature of 49.94 °C, an extraction pressure of 29.89 MPa and an extraction time of 93.82 min. Through a GC/MS analysis, we revealed 16 m...

Let Ω be a bounded domain in Rn, n ≥ 3 with smooth boundary ∂Ω and a small hole. We give the first example of sign-changing bubbling solutions to the nonlinear elliptic problem −∆u = |u| n+2 n−2+ε−1u in Ω, u = 0 on ∂Ω, where ε is a small positive parameter. The basic cell in the construction is the signchanging nodal solution to the critical Yamabe problem −∆w = |w| 4 n−2w, w ∈ D(R) which has l...