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The extraction cell was extracted under the optimized condition: Solvent, water; particle size, 80 96 μm; pressure, 1500 psi; temperature, 40°C; Static time, 10 min; number of cycle, 1.
It is also evident that the impurities in the crude extract remain in the extraction cell, as verified by the peak obtained in chromatogram B. However, phenolic compounds and probably other compounds not identified in the present study remain active in the extraction cell (ECell), which confers antioxidant activity to the residue in the extraction cell (see Table 5).
PLE using ethanol as solvent at 10.7 MPa (50 °C and 100 °C) after 5 cycles of 5 min extraction (mixing in the extraction cell the sample with sand in a ratio 1 4) yielded extracts with respectively 5 and 2.9% sterols.
Another finding was that adding the internal standard on top of the soil in the extraction cell causes considerable over-estimation of the concentrations when large samples are extracted with small solvent volumes.
The flush volume amounted to 50% of the extraction cell volume.
The extraction procedure was performed into a newly designed flow-through extraction cell coupled on a sequential injection manifold.
Isothermal interphase mass transfer measurements were carried with the partially miscible Type I system glycero (1 -water (2)-acetone (3) in a modified batch Lewis extraction cell.
The operational parameters of the system, such as flow rate, extraction cell temperature, extraction solution chemistry composition, extraction time, etc., can be easily adjusted to fit different purposes.
In brief, powder (0.5 g) was mixed with diatomaceous earth in a proportion of 1 2 and placed into an 11 mL stainless steel extraction cell.
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The extractions were carried out in 1 mL extraction cells and the amount of sample extracted was only 100 mg.
Silica (1 g) was placed in the bottom of the extraction cells as clean-up sorbent.
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