NMR probes, and further development in cryoprobe technology along with the use of improved processing procedures, will continue to enhance the sensitivity of HPLC-NMR coupling. As a microanalytical method, HPLC-NMR allows the detection of various groups of natural compounds and other biomolecules in the nanogram or even picogram range and, therefore, can contribute to the solution of problems o...

In this work, different extraction techniques (soxhlet extraction, hydrodistillation, subcritical water and supercritical carbon dioxide followed by conventional extraction) were employed for the isolation of bioactive compounds from areal parts industrial hemp (Cannabis sativa L.). The process parameters, time temperature pressure, on yield content examined. As plant material after still conta...

Supercritical fluid and ultrasound assisted extractions were applied as a first step in a complex processing of spruce bark in order to recover polyphenols compounds. The aim of the study was to compare the efficiency of these "green" processes with a conventional extraction technique (ethanolic extraction). Supercritical fluid extraction was carried out in two steps: (i) static extraction for ...

Sequential ultrasound-microwave associated extraction (SUMAE) is a combination of ultrasound waves and microwaves energies in which ultrasonic extraction is used as a pretreatment. It was performed to extract essential oil from Zataria multiflora. The extraction conditions were optimized by response surface methodology (RSM) and Central Composite Design (CCD). The antioxidant and antibacterial ...

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 Luque de Castro MD and Garcia-Ayuso LE (1998) Soxhlet extraction of solid materials: an outdated techniquewith a promising innov...

Essential oil components were extracted from Lavandula angustifolia (Lavender) flowers using pressurized fluid extraction (PFE). A Box-Behnken design was used to optimize the effective extraction variables. The chemical composition of extracted samples was analyzed by gas chromatograph-flame ionization detector column. For achieving maximum % extraction yield the temperature, pressure, and dyna...

Supercritical Fluid properties are of interest as being significantly different from liquids or gases in the area near the critical temperature, T c , and the critical pressure, P c. The primary physical feature of supercritical fluids in the immediate critical point region is the very pronounced change in density with pressure. Critical region shown for carbon dioxide in terms of Pr and Tr, th...

chrmatography and Suorescence detection. Journal of High Resolution Chromatography 21: 667}670. Leeming R andHamerW (1990)Determination of polycyclic aromatic hydrocarbons in lake sediments. Organic Geochemistry 15: 469}476. Messer DC and Taylor LT (1995)Method development for the quantitation of trace polyaromatic from water via solid-phase extraction with supercritical Suid elution. Journal o...

The purpose of this study was to investigate the applicability supercritical fluid technology for extraction avocado oil. dried fruit pulp (Persea americana Mill.) extracted by using a semi-pilot system. Effect several process parameters, such as CO2 flow rate, particle size, pressure and temperature on total oil yield, free fatty acid, peroxide value, phenolic flavonoid content in were assesse...