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Thermo-oxidative stability of mixtures of vegetable oils
Kovačíková, Barbora
;
Lehocký,, Marián
(referee) ;
Zemanová, Jana
(advisor)
Rostlinné oleje se používají v mnoha odvětvích chemického průmyslu. V průběhu zpracování konkrétního produktu, ve kterém jsou rostlinné oleje použity, dochází často ke zvyšování teploty. Vyšší teplota urychluje průběh auto-oxidace což negativně ovlivňuje stabilitu olejů nebo výrobků z nich připravených. Mezidruhové mísení olejů je poměrně častým jevem jak při samotné výrobě tak i ve finálním výrobku. Cílem této práce bylo stanovit termo-oxidační stabilitu šesti čistých rostlinných olejů a jejich binárních směsí. První část práce zkoumá oleje a připravené směsi pomocí metody diferenciální kompenzační kalorimetrie. Tato metoda umožnila pochopení vztahů mezi termo-oxidačním chováním olejů a jejich směsmi pomocí stanovení teplot degradace. Přímá souvislost mezi obsahem mastných kyselin a stabilitou byla prokázána pouze zčásti, stejně tak jako původní předpoklad, že přídavek stabilnějšího olej zvýší stabilitu oleje méně stabilního. V několika případech docházelo dokonce ke snížení stability pod teplotu degradace obou čistých olejů. Ve druhé části byl zjišťován mechanismus pro-oxidační fáze vedoucí k degradaci olejů pomocí termogravimetrie, která ukázala přírůstek hmotnosti ve vzorcích oleje způsobeného absorpcí kyslíku a tvorbou peroxidů předcházející degradaci. V tomto případě již bylo možné pozorovat jistou souvislost mezi obsahem mastných kyselin a vzrůstem hmotnosti, pouze však jen pro čisté oleje. Ani v tomto případě nebyla prokázána aditivita vlastností způsobujících stabilitu směsí rostlinných olejů.
Detailed record
Stabilization of fat components of cosmetic preparations
Kovačíková, Barbora
;
Janoušková,, Eva
(referee) ;
Zemanová, Jana
(advisor)
This bachelor thesis deals with the stability of fatty components in cosmetic products. Course of study contents composition and possible instability causes of fatty components which are today used the most. Instability causes of fatty components were considered from the view of their chemical composition, environmental influences and then for example in term of the presence of antioxidants and emulgators. Next chapter describes methods for reduction of the lipids instability by the medium of chemical substances, for example antioxidants. The conclusion offers compact view of the lipids phases stability, possible causes of the degradation of lipids and methods for its limitation. As the most stable fatty components are generally considered synthetic lipids, on the other way, at least stable are natural lipids and oils.
Detailed record
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