Laboratory notes in household chemistry for the use of students in domestic science by unknow

Author:unknow
Language: eng
Format: epub
Tags: Chemistry, Food
Publisher: Easton, Pa., The Chemical publishing company
Published: 1904-03-25T05:00:00+00:00

PROTEIN BODIES.

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oxygen and nitrogen, sulphur, sometimes phosphorus, iron, etc. They may be classed as follows :

' Simple.

Protein bodies -

f Albumen t Globulin

f Coagulated forms Acid albumen

'Proteids ■{ Derived... -l Alkali albumen

Albumose Peptone

I Compound.. Nucleoproteid

Albuminoids \ Gelatine, from tissues and bones ^ Keratin, from hair

Composition of Proteins. —

1. Determination of Nitrogen as Ammonia. —Mix some dried albumen with lime and moisten sufficiently to roll into small .balls with the fingers. Place two or three of these balls in a dry test-tube, heat and hold in the vapors a piece of moistened red litmus paper, note the result. Let the paper dry and note the change.

2. Determination of Sulphur as Hydrogen Sulphide. — Test the fumes with a piece of filter-paper moistened with lead acetate and note the result.

3. Determination of Hydrogen and Oxygen as Water. — Observe the condensation of water in the cooler part of the tube.

4. Determination of Carbon. —Observe the blackening effect produced by the freeing of the carbon.

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