Chemical quality parameters of three oilseeds influenced by both insect infestation and fumigation with phosphine in storage

Abstract EN

The purpose of the present study is to investigate the changes which occur for certain chemical quality parameters such as weight loss (WL), peroxide value (PV), free fatty acids (FFA) and protein content of some oilseeds affected by whether when their insect infestation in storage or its fumigation by phosphine gas.

The results clearly showed that there was increase in WL and number of adult emergences with increasing of storage period.

Also, results noticed that infested peanut seeds by Ephestia cautella (Walker) (Lepidoptera: Phycitidae) have higher PV, FFA and lower protein content, whilst, fumigated peanut seeds only significant higher protein content, but, did not induce any changes in PV and FFA.

So, consider insect infestation had deleterious effect on the seeds and that phosphine fit as fumigant for peanut seeds as a result PV below the limit in the Codex standard of 10 mEqO2 kg-1 oil.

Oppositely, sesame seeds, the results showed that fumigated and infested sesame seeds by Oryzaephilus surinamensis (L.) (Coleoptera: Silvanidae) have only significant higher PV and lower FFA and protein content which are consider indicator on quality deterioration of sesame seeds and phosphine unfit as fumigant for sesame seeds as a result PV higher of the limit in the Codex standard of 10 mEqO2 kg-1 oil.

Also, fumigated and infested maize grains by Rhyzopertha dominica (F.) (Coleoptera: Bostrichidae), did not affect approximately all tested parameters with except protein content which significant increase in fumigated grains about infested and un-infested grains.

So, phosphine fit as fumigant for maize grains.