Abstract
The aim of this work was to determine the fatty acids (FA), tocopherols, phenols, and antioxidant capacity (AC) of five virgin olive oils (VOO) obtained from the olive cultivar ‘Roghiani’, from different regions of northern Libya during the crop year 2015. The parameters determined for the oils were investigated for the first time. Seven principal FAs were detected in the VOO samples. Oleic, palmitic, and linoleic acids were the dominant ones. The highest percentage of palmitic acid was found in Tripoli VOO (P ≤ 0.05). Oleic acid was dominant in all the VOO samples. Gharyan VOO possessed the highest value of oleic acid, O/L ratio, monounsaturated fatty acids (MUFA), total phenols content (TPC), total tocopherol and tocotrienol contents (TTC), and ACDPPH % (P ≤ 0.05). A strong positive relationship between TPC and (AC) as (1/EC50DPPH) was observed, (r) was +0.831. On the other hand, (1/EC50DPPH) showed a positive correlation with TTC, (r) was +0.768.
Highlights
Libya is one of the olive oil producers in North Africa, where olive oil is part of the basic culture
Seven principal fatty acids (FA) were detected in the virgin olive oils (VOO) samples
Palmitic, and linoleic acids were dominant in the VOO, the other FA occurred in small amounts
Summary
Libya is one of the olive oil producers in North Africa, where olive oil is part of the basic culture. Phenolic compounds are important in terms of VOO quality because of their contribution to the oil’s flavor and aroma. They protect olive oil from oxidation through their antioxidant properties (Dabbou et al, 2011). The main objectives of this study were to investigate the phytochemical profile (fatty acids, phenolic acids and tocopherols), and in vitro, to determine the biological potential (antioxidant capacity) of the VOO obtained from the ‘Roghiani’ cultivar from five regions in northern Libya. The relationship and correlations between phytochemicals and antioxidant capacity have been highlighted The investigation of these compounds supported by verifiable evidence may explain their role in the quality and authenticity of Libyan VOO as well as their contribution to human health
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