The Chemistry of Foods: Tea, coffee, cocoa, sugar, etcCommittee of Council on Education, 1881 - Food |
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Page 16
... obtained , some of them must obviously be incorrect . Instead of making a water extract only , we have first exhausted the tea as completely as possible with alcohol of 70 per cent . , and then with water , keeping the extracts apart ...
... obtained , some of them must obviously be incorrect . Instead of making a water extract only , we have first exhausted the tea as completely as possible with alcohol of 70 per cent . , and then with water , keeping the extracts apart ...
Page 17
... obtained directly from the tea , and the whole evaporated to dryness with the addition of a further small quantity of magnesia , and completely exhausted with pure hot benzol . On distillation , or evaporation of the benzol , the theine ...
... obtained directly from the tea , and the whole evaporated to dryness with the addition of a further small quantity of magnesia , and completely exhausted with pure hot benzol . On distillation , or evaporation of the benzol , the theine ...
Page 20
... obtained in the first experiment with the solution of tea , and the difference gives the number of cubic centimetres required to oxidise the tannic acid in the tea . This Albumin or Vegetable Casein . - Six grams of finely powdered tea ...
... obtained in the first experiment with the solution of tea , and the difference gives the number of cubic centimetres required to oxidise the tannic acid in the tea . This Albumin or Vegetable Casein . - Six grams of finely powdered tea ...
Page 21
... obtained by igniting a known weight of the dry residue , and the albumin , as before stated , by combustion with copper oxide . The difference is the per- centage of cellulose and insoluble colouring matter present in the tea ...
... obtained by igniting a known weight of the dry residue , and the albumin , as before stated , by combustion with copper oxide . The difference is the per- centage of cellulose and insoluble colouring matter present in the tea ...
Page 22
... obtained by ether ; the sum multiplied by 2 gives the percentage shown as " chlorophyll and resin . " ADULTERATION . At one time there were probably few articles so generally adulterated as tea , especially when its price was such as to ...
... obtained by ether ; the sum multiplied by 2 gives the percentage shown as " chlorophyll and resin . " ADULTERATION . At one time there were probably few articles so generally adulterated as tea , especially when its price was such as to ...
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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
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