"If milk is produced under clean conditions, it is not likely to have a disagreeable odor or taste at any time, even when it is sour; rather the taste is agreeable like that of good butter milk. The curd is perfectly homogeneous, showing no holes or rents, due to the development of gas, and there is but little tendency for the whey to be expressed from the curd. This type of fermentation is largely produced by the group of bacteria to which has been given the name, Bacillus lactis acidi. The main by-product of this group of bacteria is ; small amounts of and alcohol, with traces of other compounds, are also formed. The agreeable odor and to some extent the flavor of milk fermented by these bacteria is due to other by-products than lactic acid, for this has no odor and only a sour taste. The acid fermentation of milk is often called the . In reality only the fermentation produced by the desirable group in which lactic acid is the most evident by-product should be thus called."
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Original Language: English
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H.L. Russell, E.G. Hastings, Outlines of Dairy Bacteriology: A Concise Manual for the Use of Students in Dairying (1914) 10th edition, pp. 86-87.
https://en.wikiquote.org/wiki/Fermentation_in_food_processing
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Fermentation in food processing
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