Search results with tag "Insoluble residue"
Determination of Structural Carbohydrates and Lignin in ...
www.nrel.gov5.5 Samples containing protein will bias the acid insoluble lignin high unless the protein is accounted for in the gravimetric determination of acid insoluble material. An independent nitrogen analysis is required to estimate the protein content of the residue. The protein estimate is then subtracted from the acid insoluble residue measurement.
RECRYSTALLIZATION, FILTRATION AND MELTING POINT
personal.tcu.edub) in case there is an insoluble residue, the hot solution is filtered to produce a homogeneous solution and to remove the insoluble impurities; c) the homogeneous solution (or filtrate) is allowed to cool slowly to room or sub-ambient temperature to produce crystals;
561 ARTICLES OF BOTANICAL ORIGIN - United States …
www.usp.orgthe ash. If a carbon-free ash cannot be obtained in this way, extract the charred mass with hot water, collect the insoluble residue on an ashless filter paper, incinerate the residue and filter paper until the ash is white or nearly so, then add the filtrate, evaporate it to dryness, and heat the whole to a temperature of 675±25°.