Miguel A. Albi

Role of IAA-oxidase in the formation of ethylene from 1-aminocyclopropane-1-carboxylic acid

Abstract The IAA-oxidase system of olive tree ( Olea europea ) in the presence of its substrate, IAA, and cofactors, DCP and Mn 2 , forms ethylene from 1-aminocyclopropane-l-carboxylic acid (ACC) bound as a Schiffs base to pyridoxal phosphate. Similarly, olive leaf discs upon incubation with ACC liberate considerable amounts of ethylene. The results suggest that this IAA-oxidase system may be the one active in the last step in the biosynthesis of ethylene from methionine.

Trace elements in edible fats. IX. Influence of demetalization on the oxidative and flavor stabilities of soybean oil

Crude and degummed soybean oils were demetalized by passing through columns packed with cation exchange resins. These oils were refined, bleached, deodorized and compared with untreated oils for oxidative and flavor stabilities. Treatment of oils with resin lowered metal content and increased stability as measured by oxidative and sensory tests.

Trace elements in edible fats. VIII. Soybean oil “demetalization” with cation exchange resins

The effects of different solvents, degree of dilution, type of resin, and temperature were studied to determine the optimum conditions for “demetalization” of soybean oils with cation exchange resins. Prooxidant metals in crude soybean oils in acetone orn-hexane solutions can be effectively removed when passed through columns of a strong cation exchange resin.