Effect Of Thermal Treatments And γ-Irradiation On The Volatile, Phenolic acids, , and Antioxidant Activity of Egyptian Fennel Essential Oil. | ||||
| Egyptian Journal of Chemistry | ||||
| Volume 67, Issue 8, August 2024, Page 239-250 PDF (947.57 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2024.253638.8974 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Magda A. Abd El Mageed1; Mostafa M. Ismail2; Mohamed Abass 2; Gamil E. Ibrahim1; Engy M. Mahmoud  1
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| 1Chemistry of Flavour & Aroma Dept National research center .NRC, Dokki, Giza 12622, Egypt. | ||||
| 2Department of Chemistry, Faculty of Education, Ain Shams University,Roxy, Cairo 11757, Egypt | ||||
| Abstract | ||||
| The effect of various thermal treatments (electric oven, microwave) and γ-irradiation at three doses, (6,8 and 10 KGy) on the composition of volatile and nonvolatile of Fennel (Feniculum vulgare mill) essential oil and also their antioxidant properties were considered. The hydrodistilled oil (HD) of control and treated samples were subjected to gas chromatography—mass spectrometry (GC/MS) analysis. The volatile profile of raw HD oil of fennel consisted mainly of estragole (65.67%) followed by carbon (9.6%), limonene (6.77%), fenchone (6.71%), and trans-anethole (5.92%). Roasting caused a drastic increase in the total yield of phenylpropanoid (major compounds) in all treated samples by thermal or by y-irradiation ranging from (82.12%) in the electric oven roasted sample to (89.63%) in 10 KGy irradiated sample compared to (72.67%) in control one. This is due to the very high increase in estragole percentage in all treated samples, ranging between (79.7%) in the electric oven sample to (87.75%) in the 10 KGy irradiated sample compared to (65.67%) in the control one. Roasting caused a decrease in the total yield of monoterpenes in all treated samples except the electric oven-roasted sample, which gained a slight increase compared to the control sample. At the same time, roasting caused a drastic decrease in oxygenated terpenoids in all treated fennel samples in comparison to the row sample. i.e. Roasting cause a drastic decrease in all components of HD oil of all treated samples of fennel except estragole which increased to reach about 90% in 10 KGy irradiated sample. This compound is considered a flavouring agent and, by the European pharmacopeia limit, does not exceed 6.0% in essential oils. it has a negative effect on animal health and was deleted from the list of flavour and food stuffs. This indicated in antioxidant activity of HD fennel essential oil; the strongest effect for reduction of DPPH radical was by microwave heated sample, which exhibited (58.65%±0.36) followed by 1OKGy irradiated sample, which exhibited (49.27%±0.32) compared to BHT (98%) at the same concentration 30 mg/m | ||||
| Keywords | ||||
| Fennel oil; roasting; microwave; γ -irradiation; antioxidant; volatile; phenolic | ||||
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