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  1. 3 Biotechnologia

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  1. 1 2005

  2. 1 2000

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  1. 3 Adamczak M.

  2. 2 Bednarski W.

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1

Enzymatic modification of natural triacylglycerols and the properties of the obtained products

100%
Adamczak M.
Biotechnologia
|
2005
|
issue 1
131-151
EN
Structured triacylglycerols (sTAG) are chemical compounds with a precisely defined chemical and stereochemical structure whose natural nutritional and physico-chemical properties have been modified. Modified TAG can be synthesized with the application of genetic engineering, physical, chemical and enzymatic methods. Due to the demand for the precisely determined structure of the resulting sTAG, their synthesis with the use of lipases is preferred. Prepared pure fatty acids or their esters, as well as synthetic monoacid triacylglycerols are necessary for sTAG synthesis. The use of such unnatural substrates requires additional processes and is cost consuming. Additionally, it can lead to loss of valuable components present in natural oils and contribute to a decrease in the oxidative stability of the resulting products. The application of naturally occurring fats or oils can considerably simplify sTAG synthesis and reduce the costs of the processes. Recently, much attention has been paid to an assessment of nutritional properties of structured triacylglycerols or acylglycerols. The aim of this article is to present the methods of sTAG synthesis, including examples of the use of naturally occurring triacylglycerols as substrates.
2

The yield of biosurfactants synthesis by Candida antarctica depending on medium composition and growth conditions

63%
Adamczak M., Bednarski W.
Biotechnologia
|
2000
|
issue 3
181-192
EN
Synthesis of surface active agents by Candida antarctica was considered. Based on chemical structure it was found that biosurfactants synthesized by yeast are glycolipids. Yield of glycolipid synthesis was depended on carbon source (lipids, carbohydrates) in the medium. Synthesis of biosurfactants by C. antarctica was induced by the presence of oils in the medium. During cultivation of C. antarctica in a fermenter with a medium containing soybean oil 45.49 g/dm3 of glycolipids was obtained.
3

Lipases - tool in oils and fats biotechnology

63%
Adamczak M., Bednarski W.
|
EN
Lipases (acylglycerol hydrolases EC 3.1.1.3) comprise a group of enzymes of widespread occurrence.Their biological function is to catalyse the hydrolise of triacylglycerols to give free fatty acids, diacylglycerols, monoglycerols and glycerol.This reaction is riverisble, so that the enzymes also catalyse the formation of acylglycerols.A feature whih differs lipases from other enzymes is their activity on water-insoluble substrates, at oil-water interface. Interest in lipases from different sources, in particular from microorganisms, has markedly incresed in the last decade due to the potential application of lipases in food industry, chemical industry, chemistry, biochemistry and medicine.
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