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مقالات شیمیایی 2013
جزئیات رویداد
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همایش ، رویداد ، ژورنال
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  • evaluation of waste products in the synthesis of surfactants by yeasts

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     the highest yields of biosurfactants were obtained by: (i) pseudozyma antarctica (107.2 g l−1) cultivated in a medium containing post-refining waste; (ii) pseudozyma aphidis (77.7 g l−1); and (iii)starmerella bombicola (93.8 g l−1) both cultivated in a medium with soapstock; (iv)pichia jadinii(67.3 g l−1) cultivated in a medium supplemented with waste frying oil. it was found that the biosurfactant synthesis yield increased in all strains when the cell surface hydrophobicity reached 70–80 %, enabling the microbial cells to make good contact with hydrophobic substrates. the lowest surface tension of the post-cultivation medium was from 32.0 mn m−1 to 37.8 mn m−1. however, this parameter (which was also determined by a drop collapse assay) was of limited use in monitoring biosurfactant synthesis in this study. the crude glycerol was not a good substrate for biosurfactant synthesis although, in the case of p. aphidis, 67.4 g l−1 of biosurfactants were obtained after cultivation in the medium supplemented with glycerol fraction (gf2). in a low-cost medium containing soapstock and whey permeate or molasses, about 90 g l−1 of mannosylerythritol lipids were synthesised by p. aphidis and approximately 40 g l−1 by p. antarctica.

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