Wyniki wyszukiwania

1

Lipolytic activity and radial daily growth rate changes during incubation of Thermomyces lanuginosus on natural and synthetic fatty substrates

100%

Janda K.

Roczniki Państwowego Zakładu Higieny

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2005

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tom 56

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nr 4

The study was to compare lipolytic activity and radial growth rate changes during the incubation of Thermomyces lanuginosus strains on natural (sunflower oil, soybean oil, rapeseed oil, and corn oil) and synthetic (tributyrin, Tween 20, Tween 40, Tween 60, Tween 80, and Tween 81) fatty substrata. The strains were isolated from different natural sources and incubated at 55°С on solid media containing natural and synthetic fatty substrata. The general (mean) lipolytic activity index decreased on natural substrata and increased on synthetic substrata during a five-day incubation period. The general daily growth rate changes were found to be similar on both natural and synthetic fatty substrata. However, the lipolytic activity index and daily growth rate changes were found to be highly differentiated on synthetic fatty substrata. Further studies on determination of the factors affecting the Thermomyces lanuginosus lipolytic activity are needed, due to the species is widely used for biotechnological purposes.

2

Effect of selected lipid substrates on the process of biosynthesis of surface-active compounds by the Candida bombicola yeasts

84%

Gumienna M., Czarnecka M., Czarnecki Z.

Electronic Journal of Polish Agricultural Universities. Series Food Science and Technology

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2005

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tom 08

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nr 2

The performed investigations were concerned with the possibility of utilisation of the yeasts ATCC 22214 Candida bombicola for the biosynthesis of surface active substances on substrates containing oleic acid, sunflower oil and post-deodorising condensate as carbon sources. Glucose was the source of hydrophilic carbon in the medium, whereas nitrogen was supplied by the yeast extract. The highest yields of biosurfactants (124.5 g·dm-3 - oleic acid, 116 g·dm-3 - sunflower oil and 118.5 g·dm-3 - post-deodorising condensate) were achieved using the medium in which 3 g of glucose and 0.05 g of yeast extract and 1 g of the fat substrate. The obtained biosurfactants, depending on the fat substrate applied in the culture medium, differed with respect to their appearance. The obtained preparations reduced the surface tension of water from 70 mN/m to approximately 32 mN/m.

3

Kondensat podezodoryzacyjny jako substrat tluszczowy w biosyntezie zwiazkow powierzchniowo czynnych z wykorzystaniem drozdzy Candida bombicola

67%

Gumienna M., Czarnecka M., Czarnecki Z.

Acta Scientiarum Polonorum. Technologia Alimentaria

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2002

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tom 01

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nr 2

71-82

Badano możliwości wykorzystania drożdży Candida bombicola ATCC 22214 do biosyntezy związków powierzchniowo czynnych na podłożu zawierającym kondensat podezodoryzacyjny jako źródło węgla hydrofobowego, glukozę jako źródło węgla hydrofilowego oraz ekstrakt drożdżowy jako źródło azotu. Najlepszą wydajność biosurfaktantów (118 g-dm'3) uzyskano stosując podłoże, w którym na lg kondensatu przypadały 3 g glukozy oraz 0,05 g ekstraktu drożdżowego. Otrzymane biosurfaktanty okazały się mieszaniną związków chemicznych należących do glikolipidów. Za pomocą HPLC-MS ustalono, że były to soforolipidy, a największy udział w tej mieszaninie miały frakcje laktonowe SL-1 i SL-7.

Ograniczanie wyników

1 Acta Scientiarum Polonorum. Technologia Alimentaria

1 Electronic Journal of Polish Agricultural Universities. Series Food Science and Technology

1 Roczniki Państwowego Zakładu Higieny

2 Czarnecka M.

2 Czarnecki Z.

2 Gumienna M.

1 Janda K.

2 2005

1 2002

Lipolytic activity and radial daily growth rate changes during incubation of Thermomyces lanuginosus on natural and synthetic fatty substrates

Effect of selected lipid substrates on the process of biosynthesis of surface-active compounds by the Candida bombicola yeasts

Kondensat podezodoryzacyjny jako substrat tluszczowy w biosyntezie zwiazkow powierzchniowo czynnych z wykorzystaniem drozdzy Candida bombicola