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eISSN: 2083-5906
ISSN: 1230-1485
ISSN: 1230-1485
ORIGINAL RESEARCH
Comparative Analysis of Chemical Profiles and Antioxidant Activities Obtained from Irrigated and Rainfed Olive Trees (Olea europaea L.) in Southeastern Tunisia
1
Laboratory of Dry Land Farming and Oasis (LR16IRA02), Institute of Arid Regions, University of Gabes, 4119 Medenine, Tunisia
2
Research Laboratory of Valorization of Non-Conventional Water (LR16INRGREF02), National Research Institute of Rural Engineering, Water and Forests, University of Carthage, Ariana 2080, Tunisia
These authors had equal contribution to this work
Submission date: 2025-05-19
Final revision date: 2025-08-12
Acceptance date: 2025-10-19
Online publication date: 2026-02-03
Publication date: 2026-10-23
Corresponding author
Amel Gasmi
Laboratory of Dry Land Farming and Oasis (LR16IRA02), Institute of Arid Regions, University of Gabes, 4119 Medenine, Tunisia
Laboratory of Dry Land Farming and Oasis (LR16IRA02), Institute of Arid Regions, University of Gabes, 4119 Medenine, Tunisia
Pol. J. Environ. Stud. 2026;35(5):6193-6205
KEYWORDS
TOPICS
ABSTRACT
Olive tree cultivation is a vital activity in central and southern Tunisia's semi-arid and arid
regions due to their nutritional value and adaptability to water-stressed conditions. In this study, the
phytochemical profile, including the content of α-tocopherol, minerals, polyphenols, flavonoids, and
tannins, was identified from the leaves of two oleaster trees from the “Chemlali” variety in southern
Tunisia. Two olive sites, rainfed and irrigated, were used for comparison. Antioxidant activities were
assessed using the 2,2-diphenylpicrylhydrazyl (DPPH) assay. HPLC/MS analysis of ethyl acetate leaf
extracts identified 15 organic compounds. The main phenolic compounds were quinic acid (569.11±1.49
mg/100 g DW and 560.95±0.80 mg/100 g DW in rainfed and irrigated leaves, respectively) and luteolin-
7-O-glucoside (127.36±4.61 and 141.64±0.45 mg/100 g DW, respectively). The α-tocopherol, sugar,
and mineral contents were also evaluated. DPPH scavenging capacity was slightly higher in rainfed
leaves (90%) than in irrigated ones (88%). A significant decline in total phenolics and sugar content
was observed in leaves from irrigated trees compared to those from the rainfed site. The sugar content
ranged between 8.4 g/kg in the irrigated trees and 7.54 g/kg in the rainfed ones. The minerals K, Mg,
Na, and Ca were detected in notably high quantities in the extracts of both sites. Overall, the effects of
irrigation were very pronounced, mainly in terms of sugar content and total phenolic compounds. Olive tree leaves consistently serve as an outstanding source of high-value natural compounds with significant
biological activities, even though irrigation directly influences leaf composition and quality.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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| eISSN: | 2083-5906 |
| ISSN: | 1230-1485 |
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