Possibility for Removing Products of Thermal Degradation of Edible Oil by Natural Aluminosilicates

Dobrnjac, Sanja; Dobrnjac, Mirko; Škundrić, Jelena Penavin; Vasiljević, Ljubica; Blagojević, Stevan; Sandić, Zvjezdana P.

doi:10.1007/978-3-319-99620-2_5

Cited by 2 publications

(4 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Measuring was performed on the instrument Lambda 25 UV/VIS Spectrometer PERKIN ELMER. The volumetric method was used to determine the concentrations of the aqueous solution of ammonia with the standard solution of the chloride acid with the concentration of 0.1 mol/L, the concentration of the aqueous solutions of acetic acid with the standard solution of sodium hydroxide with the concentration of 0.1 mol/L, and alcohol solution of the lauric acid with 0.1 mol/L solution of the potassium hydroxide [7,13].…”

Section: Resultsmentioning

confidence: 99%

Adsorption on Alumina of Different Origin

Škundrić¹,

Lazić

Dobrnjac³

et al. 2016

Self Cite

View full text Add to dashboard Cite

The adsorbent used in the study was the alumina obtained from the bauxite found in the locality of Milici, Siroki Brijeg and alumina synthesized in the laboratory and obtained by sedimentation from the solution of aluminium nitrate and concentrated ammonia along with controlling pH solution in the course of sedimentation. The obtained sediment of alumina was annealed for 4 hours at 273 K. The adsorbates were triphenylmethane dyes, carboxylic acids – acetic and lauric one and aqueous solution of ammonia. Alumina was modified by the surface active agents (SAA), cation-active SAA, triethanolamine-di-estermethylsulfate called Propagen, and anion-active SAA, Na-salt alkyldiglycoethersulfate called Genapol. The textural characteristics of adsorbents were determined by the adsorption of nitrogen from the gas phase at the temperature of liquid nitrogen, and the results of the adsorption of acid and base adsorbates gave an insight in the changes, i.e. characteristics of surface active centers on which the adsorption takes place.

show abstract

Section: Resultsmentioning

confidence: 99%

Adsorption on Alumina of Different Origin

Škundrić¹,

Lazić

Dobrnjac³

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…The method is based on the reaction between hydroperoxides or peroxides from oil and hydroiodic acid, liberated from potassium iodide in an acidic environment. The product of this reaction is liberated elementary iodine (Dimić and Turkulov, 2000). The peroxide value expressed as mmol/kg, is calculated using the following formula:…”

Section: Determination Of Pn In Edible Oilmentioning

confidence: 99%

“…Peroxide number is also widely applied in determining the efficiency of various antioxidants, as well as in rapid tests for determining oil durability. Apart from that, it is often used for determining the overall oxidative conditions or the "oxidative history" of oils (Dimić and Turkulov, 2000). Adsorption is being used increasingly as an efficient surface method for removing undesirable substances from oils and improving the quality of used heated edible oil (Vasiljević et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…The texture of the adsorbent is defined as a network of channels, cracks and pores formed by the distribution of mutually connected primary and secondary particles with varying sizes and shapes, with empty spaces between the junctions. Adsorbent texture is defined by the following parameters: specific surface area, porosity, pore shape, the proportion of pores of specific size in total pores (pore diameter distribution), mean pore size, pore size distribution, and the shape and size of pore agglomerates (Putanov, 1995) (Dobrnjac et al, 2018.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Removing Products of Thermal Degradation from Edible Oils by Zeolite and by Clinoptilolite - Comparison of Results

Dobrnjac¹,

Vasiljević²,

Blagojević³

et al. 2019

JEPM

Self Cite

View full text Add to dashboard Cite

When edible oils are heated above 150°C, they undergo thermo-oxidative changes depending on a variety of factors, such as temperature, heating time, type of oil, etc. These changes cause a series of chemical reactions (hydrolysis, oxidation, polymerization, etc.) resulting in the formation of free fatty acids, an increase in the peroxide number and the acid number, a change of color and a decrease in the iodine number. This study investigates changes of the content of free fatty acids, the acid number, and the peroxide number in edible sunflower oil when heating at the temperature range from 110°C to 190°C for 30 minutes, as well as after the adsorption by a natural and a synthetic adsorbent (clinoptilolite and zeolite 4A). The results of the research show that these adsorbents are effective in removing the products of chemical reactions occurring in thermal degradation, which is particularly evident after the adsorption of oil heated at 190°C. Somewhat better results were achieved after the adsorption using clinoptilolite, with a 72 % reduction in the content of free fatty acids, 83 % reduction in the acid number, and 43 % reduction in the peroxide number. After the adsorption by zeolite 4A, the content of free fatty acids was reduced by 65%, the acid number by 76 %, and the peroxide number by 39 %. The results obtained open the possibilities of further research aiming at discovering the adsorbents which would be most suitable for the regeneration of used edible oils, after which they could be applied safely for different purposes.

show abstract

Possibility for Removing Products of Thermal Degradation of Edible Oil by Natural Aluminosilicates

Cited by 2 publications

References 16 publications

Adsorption on Alumina of Different Origin

Adsorption on Alumina of Different Origin

Removing Products of Thermal Degradation from Edible Oils by Zeolite and by Clinoptilolite - Comparison of Results

Contact Info

Product

Resources

About