. The chemistry of agriculture, for students and farmers. Agricultural chemistry. CHEMICAL COMPOSITION 343. It is dextrorotatory and reduces Fehling's solution, although to a less extent than dextrose. It is hydrolyzed by enzymes and acids to dextrose and galactose. It does not undergo ordinary alcoholic fermentation except under the influence of certain yeasts. The principal change in lactose is due to the so-called lactic bacteria which hydrolyze it to lactic acid, thus: C12H22O11 + H2O = 4C3H6O3. It is this lactic acid to which is due the taste of sour milk, and it is produced so quickly th
. The chemistry of agriculture, for students and farmers. Agricultural chemistry. CHEMICAL COMPOSITION 343. It is dextrorotatory and reduces Fehling's solution, although to a less extent than dextrose. It is hydrolyzed by enzymes and acids to dextrose and galactose. It does not undergo ordinary alcoholic fermentation except under the influence of certain yeasts. The principal change in lactose is due to the so-called lactic bacteria which hydrolyze it to lactic acid, thus: C12H22O11 + H2O = 4C3H6O3. It is this lactic acid to which is due the taste of sour milk, and it is produced so quickly that ordinary milk contains about per cent, of lactic acid. The taste is apparent when the proportion rises to per cent., and at per cent, milk "; Curdling is due to the coagulation of case- inogen (see below). The percentage of lactic acid rarely rises above 2 because in that amount the action of the lactic acid bacteria is inhibited. Lactose is only one-tenth as sweet as sucrose. (6) Fat in milk is, of course, like other fixed oils in that it is composed of glycerides of fatty acids. Milk fat differs from other animal fat in that it is composed of a number of lower fatty acids, there having been found the following:. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stoddart, Charles William, 1877-. Philadelphia, New York, Lea & Febiger
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