Interactions Among Oil Components During Adsorption: Effects on Carotenoids and Peroxides

Abstract

Soybean, cottonseed, corn and squash seed oils were treated for 3 h with activated carbon (l%, 2.5%, and 5%) in a batch adsorption system at 50 and 90°C. Peroxides (P,) and carotenoids (C,) were determined after adsorption. Equations that described the P, and C, variability were developed through discriminatory multiple regression analysis using as independent variables chemical characteristics of the oils (iodine and saponification index, peroxides, carotenoids and free fatty acids, saturated/unsaturated fatty acids ratio), process temperature and adsorbent concentration. Variables in the models explained 185% and =93% of the total variability observed in the P, and C, concentrations respectively, independent of oil source.

Adsorption isotherms of squash (Cucurbita moschata) seed oil on activated carbon

“…The results presented in Figure 5 indicate that the IV/SV ratio varied as a function of the adsorption conditions utilized as well as with contact time. This point is in agreement with previous results (8) and suggests that the physicochemical properties, and therefore the functional properties of an oil may be modified as a function of the conditions utilized during the adsorption process.…”

“…The adsorptive process of bleaching, achieved through the use of matrices, such as bentonite, diatomaceous earth and carbon, is mainly intended to improve oil color (5). However, several reports have shown additional effects on the concentration of trace metals, phospholipids (6), peroxides (7,8) as well as in the products of peroxide decomposition (9). Bleaching is the only operation in the refining of vegetable oils that makes use of an adsorption process.…”

“…Bleaching is the only operation in the refining of vegetable oils that makes use of an adsorption process. Brown and Snyder (6) and Toro-Vazquez (8) have pointed out that studies on the selective adsorption of undesirable components from "crude" oils could lead to an increased efficiency of refining methods, a better understanding of bleaching procedures and a better control of the physicochemical/functional properties of refined oils. The process of adsorption involves separation of a substance from one phase accompanied by its accumulation or concentration on the surface of the adsorbing phase.…”

Linker‐Free, Silica‐Bound Olefin‐Metathesis Catalysts: Applications in Heterogeneous Catalysis

“…In front of the heterogeneous catalyst bed that was packed with 10@silica and 11@silica, two additional beds that were filled with charcoal (2 20 g, Norit A Supra) were installed to adsorb these catalyst poisons before the methyl oleate feed reached the catalyst bed. [28] Both materials 10@silica and 11@silica showed significant Ru leaching (19 and 12 %, respectively), as determined by a comparison of the amount of ruthenium on the fresh and spent catalysts by ICP-MS (Table 3). The Ru leaching from 10@silica was more pronounced than that from 11@silica.…”

Phenol antioxidant efficiency in various lipid substrates containing hydroxy compounds

“…These results may be discussed in view of the approach, suggested in our previous paper [16]. Various polar products with oxygen containing groups (hydroperoxides, fatty alcohols, acids and water) are formed during the oxidation [16,[23][24][25]. These compounds tend to associate in the non-polar media to form complexes and other aggregates.…”