Grasas y Aceites, Vol 49, No 1 (1998)

Using Uruguayan pillared clays for bleaching corn oil.


https://doi.org/10.3989/gya.1998.v49.i1.708

T. Pagano
Facultad de Química, Montevideo, Uruguay

M. Sergio
Facultad de Química, Montevideo, Uruguay

A. Montenegro
Facultad de Química, Montevideo, Uruguay

W. Diano
Facultad de Química, Montevideo, Uruguay

M. A. Grompone
Facultad de Química, Montevideo, Uruguay

Abstract


In the present paper adsorptive capacity to remove carotenes from a com oil by an Uruguayan montmorillonite modified by different treatments: exchange with Na+ ions (M-Na), acid-activation (Act), exchange with Ca2+ and pillaring with Keggin ions (Pile-Act), acid-activation and pillaring (Act Pil-Ca), is studied. Bleaching action of the Uruguayan modified montmorillonites is compared with two commercial days: Tonsil Optimum (Süd-Chemie) and montmorillonite of type K 10 (Aldrich). Our results demonstrate that Act and Pilc-Ca samples are so efficient bleaching clays as commercials but M-Na sample Is lower. Also, mixtures of Pilc-Ca with commercial clays, added together in one step or consecutively in two steps, are studied. These procedures do not improved the bleaching action. As conclusion, the modified clay Pilc-Ca allows to bleach a neutralized and degummed corn oil, giving an end product similar to edible commercial oils. Such effect is improved with the simultaneous action with activated clays.

Keywords


Bleaching; Corn oil; Montmorillonite; Pillared clays – Uruguay

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