Sj. Kim et al., Improvement of oxidative stability of conjugated linoleic acid (CLA) by microencapsulation in cyclodextrins, J AGR FOOD, 48(9), 2000, pp. 3922-3929
Oxidative stability of conjugated linoleic acid (CLA) encapsulated in alpha
-, beta-, and gamma-cyclodextrins (designated CLA/CDs microencapsules) was
studied by measuring the headspace-oxygen depletion in airtight serum bottl
es and by measuring the peroxide values (POV), The rate of oxygen depletion
was reduced from 41.0 (control) to 21.5, 2.1, 1.2, and 1.1 mu umol/L . h(-
1) by CLA/alpha-CD microencapsules at 1:1, 1:2, 1:4, and 1:6 mole ratios, r
espectively, indicating that CLA oxidation was completely protected by a 1:
4 mole ratio of CLA/alpha-CD. Such a protective effect by CLA/beta-CD or CL
A/gamma-CD microencapsules was achieved at a 1:6 mole ratio, but the effect
by CLA/beta-CD was slightly greater than that by CLA/gamma-CD. The protect
ive effect of alpha-, beta-, and gamma-CDs for CLA oxidation was confirmed
by their POV-reducing abilities in CLA/CDs. These results suggest that alph
a-CD was the most effective for the protection of CLA oxidation by microenc
apsulation, followed by beta-CD and gamma-CD.