The increase in the number of conjugated diene and
trienes contribute to [K.sub.232], and the secondary oxidation resulting in the formation of aldehydes and aketones is effective for [K.sub.270].
(2010), the presence of ethylene in the storage environment stimulates [alpha]-farnesene formation, and [O.sub.2] favors its oxidation to
trienes conjugates and 6-methyl-5-hepten-2-one (MHO-ona), responsible for the appearance of superficial scald on the fruit epidermis.
In turn, [K.sub.270] is associated with the generation of conjugated
trienes. According to Lopez-Varela et al.
Distillation caused decomposition of 10, giving
trienes. The bromide 10 should be used without distillation.
lactis grown at different NaCl concentrations on YEPD broth medium, pH 6 at 28UC for maximum growth NaCl% Fatty acids "as % of total fatty acids" C16:0 C16:1 C18:0 C18:1 C18:2 0 ND 25.87 40.66 50.00 ND 2 ND ND 44.00 12.00 ND 4 ND 33.18 46.22 11.30 ND 6 4.59 12.35 49.11 11.50 2.30 8 5.98 12.19 54.00 10.80 1.16 NaCl% Fatty acids "as % of total fatty acids" C18:3 C20:0 C22:0 C24:0 0 2.00 ND 3.52 ND 2 1.58 ND 4.80 ND 4 1.41 ND ND ND 6 1.29 4.93 4.85 4.88 8 1.00 8.48 4.9 4.61 # Unsaturation index = 1 (% monoenes) + 2 (% dienes) + 3 (%
trienes)/ 100 mol as defined by Kates and Hagen (1964) ND = Fatty acid not detected
Conjugated dienes and
trienes. The results of conjugated dienes and
trienes of oils added with SLE and controls are given in Table 4 and 5.
(2006) also traced increase in absorbance of thermally treated oils to the formation of conjugated dienes and
trienes which transformed into polymer compounds with increase in heat application.
Conjugated dienes and
trienes were determined as per methods of [11].
PI=(0.025 x monoenes)+(1x dienes)+(2 x
trienes)+(4 x tetraenes)+(6 x pentaenes)+ (8x hexaenes)
Conjugated dienes and
trienes, determined by absorption at 234 and 270 nm, respectively, and thiobarbituric acid-reactive substances were measured as a function of time.
Oxygenated derivatives of DHA belonging to di- and trihydroxylated series and nonconjugated
trienes are known to originate by the action of LOX.