Abstract
The effects of α- and β-cyclodextrin (CD) on the oxidative stability of linoleic acid (LA) at 35°C were studied by measuring headspace oxygen depletion in airtight 35-mL serum bottles. LA was encapsulated in α-CD or β-CD in an aqueous solution during homogenization at 8000 rpm for 1 min and then dried under vacuum for 60 h at room temperature. Headspace oxygen was measured by thermal conductivity gas chromatography. The rate of oxygen depletion for the control, which contained LA only, was 93.8 µmole/L·h. The rates of oxygen depletion for LA, encapsulated at a 1:1 mole ratio (mole CD/moles LA) in α-CD and β-CD, were 13.8 and 111 µmoles/L·h, respectively. When LA was encapsulated in α-CD and β-CD at a 2:1 mole ratio (moles CD/moles LA), the rates of oxygen depletion were 0.573 and 53.9 µmoles/L·h, respectively. Although α-CD protected LA from reaction with oxygen at both ratios, the rate of oxygen depletion by LA encapsulated in β-CD at a 1:1 mole ratio was not statistically different from the control. β-CD protected LA from reaction with oxygen at a 2:1 mole ratio. 1H nuclear magnetic resonance spectra of the complexes formed from 1:1 mole ratios of LA and CD indicated that LA was encapsulated in α-CD or β-CD.
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Reichenbach, W.A., Min, D.B. Oxidative stability and nuclear magnetic resonance analyses of linoleic acid encapsulated in cyclodextrins. J Amer Oil Chem Soc 74, 1329–1333 (1997). https://doi.org/10.1007/s11746-997-0065-5
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DOI: https://doi.org/10.1007/s11746-997-0065-5