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Oxidative stability and nuclear magnetic resonance analyses of linoleic acid encapsulated in cyclodextrins
Author(s) -
Reichenbach Wendy A.,
Min David B.
Publication year - 1997
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-997-0065-5
Subject(s) - mole , chemistry , oxygen , linoleic acid , cyclodextrin , aqueous solution , nuclear chemistry , analytical chemistry (journal) , chromatography , fatty acid , organic chemistry
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. 1 H 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.