Pure Products Volume 4

Pure Products Volume 4

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...with other artificial nutrient solutions, has the disadvantage, that the cultures it contains are more easily subject to decomposition and spoiling than some simpler nutrient solutions easily rendered germ-free by sterilization. Among these, certain sugar solutions, bouillion and other materials might deserve consideration. The absolutely complete killing off of germs in milk by heating, is still fraught with difficulties, if the aim is, not to prejudicially affect its taste; and it cannot be undertaken without a farreaching decomposition of the albuminoids it contains. This fact must be taken into consideration, when it is advanced in favor of the employment of milk, that the lactic acid bacteria are very particular with regard to their demands upon the content and character of the albuminoids necessary for their nourishment, and that for this reason milk, as a culture fluid, must certainly have the preference. Under all circumstances, the keeping properties of the preparations destined for trade use, play an important part. With regard to the solid cultures, these represent mostly an absorption of liquid cultures into some appropriate, previously sterilized nutrient medium. As such, different varities of starch and sugars are employed. Milk-sugar in the opinion of some authors, is not suitable, as lactose itself contains many organisms unfavorably affecting the souring of cream. A too extensive sterilization of this sugar is however not advisable, as it goes into decomposition under higher temperatures, as is well-known. A drying must always follow the absorption, in order to give a keeping quality to the cultures, whereby naturally, careful attention must be given to appropriately selected low temperatures. If it were possible, ..show more

Product details

  • Paperback
  • 189 x 246 x 14mm | 472g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236895819
  • 9781236895813