The Chemistry of Foods: Tea, coffee, cocoa, sugar, etcCommittee of Council on Education, 1881 - Food |
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Page 48
... filtrate from the plumbic sulphide is evaporated to dry- ness , when the caffeic acid is obtained as a yellowish brittle mass . A larger amount of astringent matter is obtained by extracting , with ether in presence of phosphoric acid ...
... filtrate from the plumbic sulphide is evaporated to dry- ness , when the caffeic acid is obtained as a yellowish brittle mass . A larger amount of astringent matter is obtained by extracting , with ether in presence of phosphoric acid ...
Page 49
... filtrate is added 200 grains of con- centrated hydrochloric acid . The solution is now treated with alcohol to precipitate the gum . The precipitate is thrown on a tared filter washed with alcohol , and then dried and weighed ...
... filtrate is added 200 grains of con- centrated hydrochloric acid . The solution is now treated with alcohol to precipitate the gum . The precipitate is thrown on a tared filter washed with alcohol , and then dried and weighed ...
Page 53
... filtrate taken at a temperature of 60 ° F. ( 15.5 ° C. ) . This will be found to vary according to the substance employed , in the manner shown in the subjoined table : SPECIFIC GRAVITIES OF SOLUTIONS AT 60 ° F. One part of Substance to ...
... filtrate taken at a temperature of 60 ° F. ( 15.5 ° C. ) . This will be found to vary according to the substance employed , in the manner shown in the subjoined table : SPECIFIC GRAVITIES OF SOLUTIONS AT 60 ° F. One part of Substance to ...
Page 56
... filtrate is next treated with sulphuretted hydrogen , and again filtered and the lead precipitate washed . The solution is now boiled to expel sulphuretted hydrogen , and tested for glucose with a standard solution of copper , as ...
... filtrate is next treated with sulphuretted hydrogen , and again filtered and the lead precipitate washed . The solution is now boiled to expel sulphuretted hydrogen , and tested for glucose with a standard solution of copper , as ...
Page 84
... filtrate is evaporated to a small bulk , filtered , and to the filtrate alcohol of 90 per cent . is added to precipitate the gum . The precipitate is thrown on a filter , washed with alcohol , and re - dissolved in a small quantity of ...
... filtrate is evaporated to a small bulk , filtered , and to the filtrate alcohol of 90 per cent . is added to precipitate the gum . The precipitate is thrown on a filter , washed with alcohol , and re - dissolved in a small quantity of ...
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Common terms and phrases
250 cubic centimetres Acorns added adulteration albumin alcohol alkaloid analysis appearance bean benzol berries boiling water caffeic acid Caffeine cane caramel cells cellulose cent centimetres of water chemists chicory cloth cocoa cocoa nibs coffee cold water colouring matter Congou consists constituents contains copper crown 8vo crystals cubic centimetres Demy 8vo dextrin dextro-glucose dilute dissolved distilled dried estimation ether evaporated exhausted leaves Fehling's fermentation filtered filtrate glucose grains grams granules green tea husk India infusion insoluble invert-sugar kernel laticiferous laticiferous tissue leaf magnesia mangold wurzel manufacture mineral matter mixture nitrogen obtained Orange Pekoe oxide Parsnips percentage of ash portion potash powder precipitate prepared present proportion Prussian blue pure cane-sugar raw sugar removed roasted sample of coffee seeds Silica skin soluble in water solution Souchong specific gravity starch sulphuretted hydrogen sulphuric acid tannic acid tannin temperature theine theobromine Trinidad vegetable substances weight wurzel
Popular passages
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