frying oils showed an increase in peroxide value (pv) at the initial stages of the frying process followed by a decrease, and there was no correlation between pv and total polar compounds (tpc) in the same set of frying oils. all the frying oils had pvs lower than 4.42 meq o2 kg-1 oil during the frying process and, consequently, none of them was above the limit of 10 meq o2 kg-1 oil for edible ...

the present study attempts to investigate the effect of thermal treatment at 180 °c for 8 hours on chemical changes, quality indexes and oxidative stability of three iranian common virgin olive oils (zard, mari and phishomi). oil samples were taken every 2h of heating treatment and assessed for fatty acid composition, conjugated diene value, carbonyl value, color index and oxidative stability i...

this study was done to evaluate quality properties of pistacia atlantica var mutica (bene) nuts under deferent storage conditions and packaging. at the zero time, sfa and total tocopherol (tt) and total phenolic (tp) compounds were 6.8 and 725.28 and 40.1 mg per kg oil, respectively. some quality properties (peroxide value (pv), conjugated diene value (cdv) and carbonyle value (cv)) showed that...

In the title compound, C(29)H(25)NS(2), both the Cl atoms of the aza-diene precursor 4,4-dichloro-1,1-diphenyl-2-aza-buta-1,3-diene are replaced by two vicinal S-p-tolyl substituents attached to the terminal C atom of a π-conjugated 2-aza-butadiene array. The aza-diene chain is planar to within 0.01 Å. One of the phenyl rings seems to be slightly π-conjugated with the aza-diene core [dihedral a...

methanolic extracts of five native species of salvia from the labiatae family were evaluated for antioxidant activity in low-erucic acid rapeseed oil using the schaal oven test at 60°c, with deterioration monitored by determination of peroxide value, conjugated diene content and p-anisidine value. the activity of the salvia extracts was compared with that of tbhq, ascorbyl palmitate, and extrac...

The linoleic acid hydroperoxide obtained by enzymatic peroxidation of linoleic acid was found to react with thiobarbituric acid to yield a red pigment. The optimum pH for the reaction was found to be 4.0. In the early stages of peroxidation of linoleic acid, thiobarbituric acid value, the amount of conjugated diene, oxygen consumption, and peroxide value were in parallel with one another. The d...

II S, stearate; M, mOlloene; D, diene; T, trien€; CD, conjugated {Hene; eDT, conjugated diene-triene. Copper chl'omite 9.12.15 8.9 22.9 33,S 4,6 31.6 17 Nickel 9,12,15 0,9 40,S 21.1 0,5 20 Copper chromite 5,9,12 O,S 27.3 39.4 30,2 0,9 1.4 18 Copper chromite 3.9,12 lOJ 22.3 69,4 6,7 18 D T CD CDT Composition, % Position of double bonds in tl'ienes Analyses of Products Formed During :Hydrogenutio...

Acaciaside A and B, two acylated triterpenoid bisglycosides isolated from the funicles of Acacia auriculiformis, are known to have antihelmintic activity. Since the saponins contain a conjugated unsaturated system that is highly susceptible to peroxidation, we investigated the interaction of saponins and membrane using rat liver microsomes as our model. Microsomal membranes were incubated with ...

Soybean and linseed oils were selectively hydrogenated with copper-on-silica gel catalyst. The linolenate content of the oils was reduced to diene and monoene with no appreciable increase in saturates. Hydrogenated soybean oils contained 68-76% monoene, 11-18% diene, 0% conjugated diene and triene, 1-6% conjugatable diene, 0-0.3% conjugatable triene, and 23-40% isolated trans double bonds. Hydr...

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