Quality and Trace Element Profile of Tunisian Olive Oils Obtained from Plants Irrigated with Treated Wastewater
Table 1
Quality parameters of the olive oils under investigation.
Harvesting mode based on the olives percentage humidity
Palmitic acid (%)
Stearic acid (%)
Oleic acid (%)
Linoleic acid (%)
Free acidity (% oleic acid)
Polyphenols (mg kg−1)
K232
K270
From the tree
19.72
A
1.24
a
A
50.53
d
B
24.97
a
A
0.95
E
70.01
A
2.35
c
B
0.13
D
First fall
19.93
A
1.04
c
CD
51.66
c
B
24.17
ab
AB
1.52
D
42.80
B
2.42
c
B
0.17
C
Second fall
19.98
A
1.11
b
B
51.49
c
B
23.99
abc
AB
3.27
C
25.92
C
2.70
b
A
0.20
B
Third fall
19.09
B
0.92
d
D
53.16
b
A
23.82
bc
AB
5.70
B
18.72
D
2.92
a
A
0.24
A
Forth fall
18.70
B
1.12
b
BC
54.27
a
A
23.04
c
B
6.42
A
12.32
E
2.89
ab
A
0.23
A
Water regimes
TWW (alternate)
19.35
B
1.39
A
50.71
B
24.90
AB
6.19
B
21.29
D
2.83
a
AB
0.26
A
TWW (continuous)
17.40
C
0.94
C
57.32
A
21.48
C
6.80
A
26.36
C
2.32
c
C
0.21
B
Not irrigated
19.67
B
0.71
D
51.49
B
25.58
A
0.72
C
50.87
A
2.63
b
B
0.15
C
CW
21.52
A
1.30
B
49.37
C
24.03
B
0.58
C
37.28
B
2.84
a
A
0.16
C
Means, for each factor, in the same column followed by the same letter do not differ according to Tukey's test (capital letters ; small letters ). Values are the mean of three replications.
