Aggie Lala. plant. July 26th , 2017.
Turbidity of precipitation with either of those reagents was taken as preliminary evidence for the presence of alkaloids in the extract being evaluated (Harborne, 1973; Evans, 2002). Some laboratories also use Wagner's reagent, picric acid solution or tannic acid solution in place of or in addition to, the two reagents mentioned about (Persiones and Quimby, 1967).
For the test, the method described by Wall et al. (1952 and 1954) can be used. About 0.5g of each plant extract was shaken with water in a test tuber. Frothing which persists on warming was taken as preliminary evidence for the presence of saponins. In order to remove "False-positive" results, the blood haemolysis test needs to be performed on those extracts that frothed in water.
There are many useful products obtained from raspberries: Ice cream, jam, jelly, black raspberry petits fores, raspberry juice, and of course, fresh raspberry fruits.
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