Abstract
The aim of this study was to investigate the contribution of hydrolysis and absorption to the reduced digestibility found for heat-oxidized oils. Indirect evaluation methods were designed to assess the hydrolysis and absorption undergone in vivo, based on the analysis of non-absorbed lipids in faeces. The results indicated difficulties in the hydrolysis of complex glyceridic molecules included in heat-oxidized fats. Also, the data suggested that the extension of hydrolysis undergone in vivo was closely dependent on the amount and alteration degree of the dietary fat. This fact was clearly shown specifically for non-altered fatty acids while in the case of non-polar dimer fatty acids the low digestibility value may be associated in part to difficulties during the absorption process.
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