Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . according to directions given under Total Acidity, page 174. ^ One CO. of N/io hydrochloric acid contains gram of hydrochloric acid.^ One gram of sodium alizarin sulphonate dissolved in 100 cc. of water.^ Hydrochloric acid not combined with protein material.* One-half gram dissolved in 100 cc. of 95 per cent alcohol. ^ If the orange yellow color appears as soon as the indicator is added it denotes the ab-sence of free acid. CHAPTER IX FATS F
Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . according to directions given under Total Acidity, page 174. ^ One CO. of N/io hydrochloric acid contains gram of hydrochloric acid.^ One gram of sodium alizarin sulphonate dissolved in 100 cc. of water.^ Hydrochloric acid not combined with protein material.* One-half gram dissolved in 100 cc. of 95 per cent alcohol. ^ If the orange yellow color appears as soon as the indicator is added it denotes the ab-sence of free acid. CHAPTER IX FATS Fats occur very widely distributed in the plant and animal king-doms, and constitute the third general class of food-stuffs. In plantorganisms they are to be found in the seeds, roots, and fruit while eachindividual tissue and organ of an animal organism contains more or lessof the substance. In the animal organism fats are especially abundantin the bone marrow and adipose tissue. They contain the same ele-ments as the carbohydrates, , carbon, hydrogen, and oxygen, butthe oxygen is present in smaller percentage than in the carbohydrates. Fig. 50.—Beef Fat. {Long.) and the hydrogen and oxygen are not present in the proportion to formwater. Chemically considered the fats are esters^ of the tri-atomic alcohol,glycerol, and the mono-basic fatty acids. In the formation of these fatsthree molecules of water result. This water arises by the replacementof the Hs of the carboxyl groups of the three fatty acid molecules bythe glycerol radical, thus yielding the following type of formula. Inthis case the combination is with palmitic acid (C15H31COOH). CH2—OOCH31C15I —OOCH31C15 ^ An ester is an oxyacid, one of whose acid hydrogens is replaced by an organic radical. 176 FATS 177 The three fatty acid radicals entering into the structure of a neutralfat may be the radicals of the same fatty acid or they may consist ofthe radicals of three different fatty acids. By hy
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiochem, bookyear1916
