Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . oparts without filtering. Filtrate to boiling to removecoagulable proteids. If anyprecipitate forms filter it off;if there is no precipitate pro-ceed directly with the for:(a) Sugar.{b) Proteoses,(c) Peptones. Filtrate for: (a) Lactic acid.(&) Rennin.(c) Ptyalin. CHAPTER Fats occur very widely distributed in the plant and animalkingdoms, and constitute the third general class o
Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . oparts without filtering. Filtrate to boiling to removecoagulable proteids. If anyprecipitate forms filter it off;if there is no precipitate pro-ceed directly with the for:(a) Sugar.{b) Proteoses,(c) Peptones. Filtrate for: (a) Lactic acid.(&) Rennin.(c) Ptyalin. CHAPTER Fats occur very widely distributed in the plant and animalkingdoms, and constitute the third general class of food plant organisms they are to be found in the seeds, roots andfruit, while each individual tissue and organ of an animalorganism contains more or less of the substance. In theanimal organism fats are especially abundant in the bonemarrow and adipose tissue. They contain the same elementsas the carbohydrates, i. e., carbon, hydrogen and oxygen,but the oxygen is present in smaller percentage than in thecarbohydrates and the hydrogen and oxygen are not presentin the proportion to form water. According to the observa- Fig. 35-. Beef Fat. {Long.) tions of Benedict and Osterberg human fat contains percent of carbon and per cent of hydrogen. They foundthe heat of combustion of human fat to be calories pergram. 96 FATS. 97 Chemically considered the fats are esters1 of the tri-atomic alcohol, glycerin, and the mono-basic fatty acids. The II ofeach of the OH groups of glycerin is replaced by a fatty acidradical (see page 65). For instance CH2-OH 1 CH -OH ICH2-OH is the formula for glycerin and by replacing the hydrogenof the hydroxyls by hydrocarbon radicals R, R. and R we obtain, as the typical formula for an ordinary neutral fat, CH2-OOC-R ICH -O-OC-R ICH2-O-OC-R. The positions occupied by R, R and R in the above formulamay be filled by three radicals of the same fatty acid or bythe radicals of three different fatty acids. By hydrolysis of a neutral fat
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