The steps involved in the removal of Water-Soluble
and 95%-Ethanol Soluble Extractives from samples are listed below:
1. The moisture content of the sample is determined, in duplicate.
2. Six 11 ml capacity DIONEX ASE (Accelerated Solvent Extraction) cells are filled with recorded weights of the sample.
3. The following DIONEX ASE 200 Method is then used on the first 4 cells:
Pressure: | 1500 psi |
Temperature: | 100 celcius |
Preheat Time: | 0 mins |
Heat Time: | 5 mins |
Static Time: | 7 mins |
Flush Volume: | 150% |
Purge Time: | 150 s |
Static Cycles: | 3 |
Solvent: | Water |
4. The Method listed above is then repeated for cells 3-6 with the only difference being that 95%-Ethanol is used as the solvent.
5. A box, of known weight, is taken and the remaining biomass from the first extraction cell transferred to it. This is repeated for the other cells.
6. After 2 days each box is weighed again and the moisture content of a subsample of the extracted biomass determined (in duplicate).
7. The weight of
Water-Soluble Extractives is determined as the mass loss in the biomass sample, due to extraction in the ASE-200 (corrected for moisture), for the
first two cells.
8. The weight of
95%-Ethanol-Soluble Extractives is determined as the mass loss in the biomass sample, due to extraction in the ASE-200 (corrected for moisture), for the
last two cells.
9. The weight of
Exhaustive Extractives is determined as the mass loss in the biomass sample, due to extraction in the ASE-200 (corrected for moisture), for
cells 3 and 4.
10. The weight of
Water-Insoluble but Ethanol-Soluble Extractives is determined from subtracting the
Water-Soluble Extractives content from the
Exhaustive Extractives content.