Notes

Jul 05

Introduction and Scope of Microbiology

Microbiology is the study of microorganism; a large diverse group of microscopic organism that exist as a single cell or cell clusters. It also includes virus which are microscopic but not cellular. Microbial cells are thus distinct from cells of animals and plants which are unable to live alone in nature and exist as only part of multicellular organism. A single microbial cell is generally able to carry out its life process of growth, energy generation and reproduction independently of other cells, either of same kind.

The existence of microbes was not established until Antony Von Leeuwenhoek (1678) could see them in simple microscope. Lewis Pasteur (1822 – 1895) investigated that boiled medium could remain clear in swan necked flask. Pasteur developed the procedure of gentle heating (pasteurization) to prevent the spoilage of beer and wine by undesirable microbes. This process was later used to prevent milk borne diseases in human beings. Read more

Jul 04

Industrial Production of RBD Oil

Crude fat containing non glyceride components like mucilages, gums, hydrocarbons, free fatty acids, pigments, sterols along with oil are prone to rancidity. Therefore, impurities should be removed prior to storage and distribution of fats and oil. Purification steps normally involves

  1. Refining
  2. Bleaching
  3. Deodorization

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Jul 03

Vitamins: Functions and their sources

Vitamin refer to essential dietary factor which is required by an organism in small amounts and whose absence results in deficiency diseases. Vitamins are important for their regularity and protective functions. Unlike most other nutrients, they are required in very small amounts. But it is necessary to provide these in diet because many of them cannot be synthesized in our body. Excess intake of any vitamin however is harmful. Vitamins are generally classified on the basis of their solubility.

  1. Water soluble vitamin: vitamin C, B complex
  2. Fat soluble vitamin: vitamin A, D, E and K

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Jul 03

Feed Plate and Various Feed Conditions

The plate where feed is administered is called feed plate. In feed plate, the liquid rate or vapor rate or both may change depending upon thermal condition of feed.

Cold feed: the entire feed stream adds to the liquid flowing down the column. In addition, some vapor condenses to heat the feed to boiling point. This makes the liquid flow even greater in stripping section and decrease flow of vapor in rectifying section. V < V̅ and L̅ > L +F. Read more