Fatty acids composition, oxidative stability and transesterifica-tion of lipids recovered from melon and sorghum bugs

الملخص EN

Crude oil recovered by hot water from Aspongopus viduatus (melon bug) and Agonoscelis pubescens (sorghum bug), are analyzed for oil content, fatty acid composition and tocopherols.

The total lipid content of the melon and sorghum bugs is 45 and 60 %, respectively.

Oxidative stability of the melon bug oil (MBO) and sorghum bug oil (SBO) is found to be 38 and 5.1h respectively.

Triacylglycerols are the major nonpolar lipid class and contribute nearly 70% of the total amount.

Fourteen fatty acids are identified, among which oleic acid contribute 46.5 and 40.9% of the total lipid followed by linoleic acid 3.

4 and 34.

5 %, palmitic acid 44.

2 and 12.

1% and traces of linolenic acid, respectively.

The tocopherol content of these oils amounts 0.

3 and 34.0mg / 100g oil, respectively.

Gammatocopherol is the predominant tocopherol in the oil of A.

pubescens.

The total content of sterols in the two oils was 17 and 450mg / 100g oil, respectively, whereas-sitosterol is determined as the main compound in all oils with about 60 % of the total sterols.

The total amount of phenolic compounds in oil extract is 20.66 and 0.

95mg / 100g oil respectively.

Transest-erification of both oils using methanol or ethanol reveal that both oils produce biodiesel that met the DIN EN 14214specifications for biodiesel.