The Chemistry of Foods: Tea, coffee, cocoa, sugar, etc |
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Page 9
It is probable that the amount obtained from tea is greater than what was originally present in the leaf , as some of the tannin and other constituents are liable to be changed by oxidation into a resinous- like substance .
It is probable that the amount obtained from tea is greater than what was originally present in the leaf , as some of the tannin and other constituents are liable to be changed by oxidation into a resinous- like substance .
Page 10
99 Al2O3 5'55 3'42 2'73 4'19 4'52 I'54 2'70 Lime Magnesia Oxide of Manganese Phosphoric Anhydride " " ,, MnO4 1'68 1.37 I'93 1'59 I'49 2.II I'92 CaO 8.82 " " 8.74 9'54 8.98 9'04 8.58 8.19 " " ,, MgO 2.12 4.87 4.65 3'19 2'42 6.48 6'52 .
99 Al2O3 5'55 3'42 2'73 4'19 4'52 I'54 2'70 Lime Magnesia Oxide of Manganese Phosphoric Anhydride " " ,, MnO4 1'68 1.37 I'93 1'59 I'49 2.II I'92 CaO 8.82 " " 8.74 9'54 8.98 9'04 8.58 8.19 " " ,, MgO 2.12 4.87 4.65 3'19 2'42 6.48 6'52 .
Page 20
The insoluble portion which remains on the filter is dried and weighed ; and , in order to determine the amount of nitrogen present , about 7 gram is submitted to combustion with copper oxide , and the proportion of albumin calculated ...
The insoluble portion which remains on the filter is dried and weighed ; and , in order to determine the amount of nitrogen present , about 7 gram is submitted to combustion with copper oxide , and the proportion of albumin calculated ...
Page 21
The ash is 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 ...
The ash is 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 23
Magnetic oxide , sometimes referred to in the trade as iron filings , is found associated with quartz and sand in tea . An attempt at explaining the presence of this compound has been made by attributing it to the ferruginous character ...
Magnetic oxide , sometimes referred to in the trade as iron filings , is found associated with quartz and sand in tea . An attempt at explaining the presence of this compound has been made by attributing it to the ferruginous character ...
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Common terms and phrases
added addition adulteration albumin alcohol amount analysis appearance applied bean becomes boiling called cane-sugar cells cellulose cent character characteristic chicory cloth cocoa coffee colour composed consists constituents contains copper crystals cubic centimetres Description determined dilute dissolved distilled dried Edition employed estimated ether evaporated examination exhausted extract filtered filtrate given gives glucose grains grams green ground heated husk imported India insoluble known lead leaf leaves less London manufacture matter means method microscope mineral mixed mixture nibs nitrogen obtained oxide percentage plant portion powder precipitate prepared present produced proportion pure quantity removed represented residue roasted roots sample seeds seen separated shown similar skin soluble solution sometimes specific gravity starch structure substances sugar sulphuric acid surface taken tannin theine tissue treated tubes usually weight
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Bibliographic information
| Title | The Chemistry of Foods: Tea, coffee, cocoa, sugar, etc South Kensington Museum science handbooks Part 1 of The Chemistry of Foods: With Microscopic Illustrations, James Bell |
| Author | James Bell |
| Publisher | Committee of Council on Education, 1881 |
| Original from | Oxford University |
| Digitized | 5 May 2006 |
| Export Citation | BiBTeX EndNote RefMan |