The effect of temperature (50, 60, 70, 80 [degrees]C) on the yield of the extract oil and concentration of the basic nitrogen and phenolic compounds at a mass ratio of the extracting agent to oil of 1:1 using DMF as the extracting solvent was investigated, the results are shown in Figures 3 and 4.
However, the selectivity of the extracting agent decreased as the temperature increased, so the operating temperature should not be too high.
However, this is the first scientific report deals with the extraction of hydroxychavicol from betel leaf by using 85% methanol as an extracting agent
. Present study, Hydroxychavicol is extracted from methanolic extract of Betel leaf and purification is carried out by silica assisted column chromatography.
In addition, benzene is used as an extracting agent
, solvent, laboratory chemical, and additive in gasoline.
The dry extract was prepared with 59% ethanol as extracting agent
(V/V) (with a final drug/extract ratio of 4.2:1).
The dynamics of the process depends on the extracting agent used (Fig.
Total extraction yields varied in the range 27-31% (of air-dry algal biomass) depending on the extracting agent. However, during the first 2 h already the bulk of carrageenans were extracted (of total yield, including impurities): 76.3% in water, 72.6% in 0.15 M NaOH, and 55.3% in 0.15 M KOH solution.
Toward that end, the Advanced Phytonics Corp., Ossett, UK, has demonstrated the efficacy of a CFC-substitute (1,2,2,2-tetrafluoroethane) for use as a low-temperature and pressure extracting agent
for a variety of natural products and nutraceuticals.
The mixture of shale oil and solvent in the required proportions was put into a container, heated up to the required temperature and stirred to ensure good contact between shale oil and extracting agent
Drugs: Neuroplant[R] contains a hydroalcoholic extract from Herba hyperici (extracting agent
: ethanol 60% (m/m); drug-extract-ratio 2.5 to 5:1) with standardized contents of 3% to 6% hyperforin and 0.1% to 0.3% hypericin according to high-performance liquid chromatography.
Moreover, to simulate the chemical environment of a cement suspension, aqueous NaOH, Ca[(OH).sub.2], and the filtrate of a cement suspension were also used as extracting agents
. The levels of neutral solvent extractives are discussed, but the results obtained with alkaline extracting agents
suggest that, when the woods or cork are mixed with a cement suspension, cations are adsorbed onto the substrate surfaces, and are therefore, subtracted from the solution.