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| Simultaneous preparation of peanut oil and proteins by compound surfactant-assisted aqueous extraction |
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| DOI： |
| KeyWord:peanut oil aqueous extraction compound surfactant extraction rate of free oil extraction rate of protein |
| FundProject:国家自然科学基金（31671887） |
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| Abstract: |
| The peanut oil was extracted with compound surfactant by aqueous extraction in order to reduce emulsification,thereby increasing the extraction rate of peanut free oil.The effects of Tween 20,sucrose esters and citrate esters (single or combined using) on the extraction rates of peanut free oil,total oil and proteins were investigated.The effects of surfactants on rheological property of peanut protein oil-water interfacial membrane and emulsion Zeta potential were analyzed to reveal the mechanisms of surfactant-assisted demulsification.The results showed that when Tween 20, sucrose ester and citrate esters were used alone,they could improve the extraction rate of peanut free oil to a certain extent.When the three surfactants were compounded in a mass ratio of 1∶ 1∶ 2 (mass concentration 10 g/L),the highest extraction rate of peanut free oil reached 79.7%, which was almost double the extraction rate of peanut free oil extracted without surfactant. However, the effects of small molecule surfactants on the extraction rate of peanut total oil and protein, were not significant.It was found that after the surfactant replaced the interfacial adsorbed proteins,the strength of the interfacial membrane and the absolute value of the Zeta potential decreased,which might be the main reason for the demulsification of the emulsion and the significant increase in the extraction rate of free oil. |
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