Solvent-Extraction Processes of Linoleic Acid Encapsulated with Gum Arabic, Pullulan or Maltodextrin at Different Weight Ratios

Abstract

Linoleic acid was encapsulated with gum arabic, pullulan or maltodextrin at various weight ratios of the fatty acid to the wall material, and the fraction of the linoleic acid extracted from the microcapsule with chloroform was observed as a function of time. A certain amount of the linoleic acid could not be extracted even if the microcapsule was immersed in chloroform for a long period. The fraction of extractable linoleic acid was lower for the microcapsule having the lower weight ratio, and significantly changed between the weight ratios of 0.5 and 1.0 for gum arabic and pullulan. It was also shown that the fraction of extractable linoleic acid correlated fairly well with the fraction of easily oxidizable linoleic acid. An increase in the fraction was observed with 1-day storage of linoleic acid encapsulated with gum arabic at the ratio of 0.5, and the initial extraction rate linearly increased with the period of storage.