Determination of Phosphorus in Brazilian Soya Bean Oils by the Saponification Method

✍ Scribed by Hartman, L. ;Lago, R. C. A. ;Esteves, W.

• Publisher: John Wiley and Sons
• Year: 1985
• Weight: 346 KB
• Volume: 87
• Category: Article
• ISSN: 0931-5985
• DOI: 10.1002/lipi.19850871110

✦ Synopsis

Thephosphoruscontentsofcrudeanddegummed Braziliansoyabeanoils weredetermined by amcdified saponification method.Themethodconsists insaponifyingtheoilwitha50%sodium hydroxidesolutionat 1800 C,acidifying with hydrochloric acid,extracting the liberated fatty acids with hexane and determining the phosphorus in the aqueous solution spectrophometrically as molybdenum blue. The determination requires less than 3 hours of workandshowsgoodagreement withtheashingmethodoftheAmericanOi1 Chemists' Society. The results showed that Brazilian crude soya bean oils contain less total phospholipids but proportionally more non-hydratable phosphatides than the North American ones, this being specially evident in the equatorial region of Brazil. The high content of non-hydratable phosphatides impedes the determination of acetone-insolubles in crude oils and the application of the conventional conversion factors of phosphorus into phospbatides.