Entity

Time filter

Source Type


Saloua F.,Institute of Research and Physico Chemical Analysis | Saber C.,Institute of Research and Physico Chemical Analysis | Hedi Z.,Institute of Research and Physico Chemical Analysis
Bioresource Technology | Year: 2010

Oil extracted from seeds of Maclura pomifera fruits grown in Tunisia was investigated as an alternative feedstock for the production of biodiesel fuel. Biodiesel was prepared by transesterification of the crude oil with methanol in the presence of NaOH as catalyst. Maximum oil to ester conversion was 90%. The viscosity of the biodiesel oil (4.66 cSt) is similar to that of petroleum diesel (2.5-3.5 cSt). The density (0.889 g/cm3), kinematic viscosity (4.66 cSt), flash point (180 °C), iodine number (125 °C), neutralization number (0.4), pour point (-9 °C), cloud point (-5 °C), cetane number (48) are very similar to the values set forth by the ASTM and EN biodiesel standards for petroleum diesel (No. 2). The comparison shows that the methyl esters of M. pomifera oil could be possible diesel fuel replacements. © 2009 Elsevier Ltd. All rights reserved.


Fatnassi S.,Institute of Research and Physico Chemical Analysis | Chatti S.,Institute of Research and Physico Chemical Analysis | Nehdi I.E.,Institute of Research and Physico Chemical Analysis | Zarrouk H.,Institute of Research and Physico Chemical Analysis
Acta Horticulturae | Year: 2010

Studies were conducted on the chemical composition and antioxidant activities of oil extracted from Maclura pomifera seeds. The yield of oil is about 32.75% on a dry-weight basis. The chemical composition of the oil include: The fatty acids: linoleic, oleic, stearic and palmitic were the main acid. A relatively high level of sterols, β-sitosterol, accounted for 81% of the total sterol content in the seed oil and is followed by campesterol, stigmasterol, lupeol and Δ5-avenesterol. The seed oil was rich in tocopherols with the following order: α-tocopherol; γ-tocopherol; β-tocopherol and δ-tocopherol. The total phenols content (Folin-Ciocalteau assay) and antioxidant capacity (2,2-diphenyl-1-picrylhydrazyl method, DPPH.) of seed oil were analyzed. Total phenol values are expressed in terms of Gallic acid equivalent (mg/100 g of oil) and antioxidant capacity in EC50. The antioxidant activities of oil were significantly correlated with the total phenolic content and indicate that oil may impart health benefits and should be regarded as a source of antioxidant. The results showed that M. pomifera seed oil could be used in cosmetic, pharmaceutical and food products.


El Mannoubi I.,Institute of Research and Physico Chemical Analysis | Barrek S.,Institute of Research and Physico Chemical Analysis | Skanji T.,Institute of Research and Physico Chemical Analysis | Zarrouk H.,Institute of Research and Physico Chemical Analysis
Acta Horticulturae | Year: 2010

Methanol extracts of Opuntia ficus indica seeds and peels were fractionated and their subfractions were studied by high performance liquid chromatography (HPLC)-ultraviolet detection-atmospheric pressure chemical ionisation (APCI) mass spectrometry (MS) for the first time. Eleven flavonoids are identified in the methanol peels extract. Flavonic aglycones belong to flavonols, dihydroflavonols and flavanones. The major glycosylated flavonoids are isorhamnetin mono-, di- and triglucosides. Four flavonoids were identified in the seeds extract as prenyl flavanones and methoylated flavones. Aglycones and monoglucosides were the major compounds of these extracts. Sugars were identified after extracts acid hydrolysis by comparison with standards. The antioxidant activities of both methanolic extracts were determined with DPPH assay, ABTS test and reducing power. All methods showed the seeds extract is a powerful scavenger.

Discover hidden collaborations