(41d) Application of Linoleic Acid Hydroperoxide as a Mild and Green Bleaching Agent

Lipoxygenase obtained from soybeans can catalyze the oxidation of linoleic acid to linoleic acid hydroperoxide (LA-HPOD),the latter is a new type of soybean oil-derived multifunctional surfactant having both bleaching and washing performances at lower temperature. Nowadays it is very important to exploit long-chain fatty acid in soybean oils especially with biotechnology when petroleum resource is drying up. Sodium perborate and sodium percarbonate are commonly used bleaching agents in commercial markets, but both have problems of high irritation. If LA-HPOD could replace them into detergents, it will increase the application of biotechnology in soybean oil process and addition value, make bleaching detergents develop to a green, mild and multifunctional direction. In this paper, the bleaching effect of LA-HPOD on methylene blue and chlorophyl was investigated. Comparing with sodium perborate and sodium percarbonate, LA-HPOD performed the best on bleaching methylene blue but worst on chlorophyl. LA-HPOD was then added into commercial detergent formulations to study their snynergistic effects through detergency experiments performed on two kinds of cloths, green tea stained cotton and coffee stained cotton, to select a promising commercial formulation to add LA-HPOD in and become a mild bleaching detergent.